nnaida2 , the bare test FEE64 in T9, is successfully running with two streams connected to nndhcp177 ( a Linux64 computer )

Merge running on nndhcp177 is receiving the streams and merging them.

nnaida2 has a slow pulser , 100Hz , connected to one waveform input.

Apparently waveforms are being merged with ASIC data. ( stream 0 and 1 from nnaida2 )

Next step is to add a Tape server to nndhcp177 and verify the recorded events.

I have changed the T9 system to be using Version 8.

Tests using the detector and pulser seem to be ok.

Transmission to the Merge and Merging operating ok

Shaping time 8uS and threshold 64.

Note:-

The Leading Edge Discriminator has changed in Version 8 and is a true implementation of a Leading Edge Discriminator. With hysteresis which requires the input signal to go below the threshold before allowing another trigger.

The Delay setting on the LED web page is removed.

The LED web page is aware of the version being used ( shown at the top of the page ) as the Threshold for the LED is an ADC value ( 0 to 16383 ) rather than a difference from the current baseline.

For a positive waveform where the baseline is expected to be about 8192 a value of 9000 will potentially give a trigger.

For a negative waveform where the baseline is expected to be about 8192 a value of 7000 will potentially give a trigger.

Example window attached.

I would value feedback.

MSL type BB18(DS)-1000 serial 2998-22
Bias +200V, I_L +=6.070uA, ambient temperature +20.2 deg C
 
DSSSD - AIDA adaptor PCB cabling
 
4 off LH Coupler (Kapton PCB, 5cm), 2x 34-way Samtec ribbon cable (45cm), RH coupler(Kapton PCB, 10cm)
 + 3M 1245 1.4mil copper foil screen ribbon cables + RH coupler only (i.e. not LH coupler)
 + drain wires -> gold-plated Lemo-00 test input connectors 
 
nnaida 11 & 12 AIDA adaptor PCB rev B
nnaida 13 & 14 AIDA adaptor PCB rev C (LK1 fitted) 
ground links LK3 & LK7 fitted to nnaida11-14 AIDA adaptor PCBs

Heavy duty copper cable connects copper front end frames of FEE modules
Nitto 5011N conductive gasket between FEE module and front end frames
 
Standard ASIC settings
 nnaida 11 & 12 - negative input
 nnaida 13 & 14 - positive input
 
Pulser BNC PB-5 
Fall time 1.0ms
Rate 100Hz
Delay 250ns
Ampl 5.00000V
Polarity +
Pulse top Tail
Atten 10x
Clamp ON
- polarity via Cooknell SA1 Summing Amplifier
 
207Bi source, approx centred on DSSSD, approx 3cm from DSSSD

Compare measurements to previous electronic noise tests 27 January 2016
See https://elog.ph.ed.ac.uk/AIDA/145

nnaida11

Shaping time(us)

0.5  1   2   4   8

87 80 75 60 54
88 81 76 62 58
87 83 78 62 57
84 74 69 56 56
81 78 72 59 56
86 79 74 60 56
85 73 65 56 57
85 77 72 59 57
83 77 73 60 56
85 81 77 62 58
85 71 65 55 55
80 76 72 59 56
85 78 73 59 57
87 76 71 58 55
93 85 78 62 55
91 86 81 64 55

85.8 78.4 73.1 59.6 56.1 mean
 3.2  4.2  4.5  2.5  1.2 std dev

nnaida12

0.5  1   2   4   8

87 77 69 58 55
83 78 75 61 58
80 84 77 63 56
86 73 64 54 54
85 77 69 58 55
86 77 71 59 55
85 72 64 55 55
84 74 66 56 55
82 74 67 57 55
80 78 73 61 55
80 70 63 55 55
82 72 65 56 53
82 73 69 58 56
90 74 64 55 55
95 84 74 59 53
86 82 74 59 55

84.6 76.2 69.0 57.8 55.0 
 4.0  4.3  4.6  2.5  1.2

nnaida13

0.5  1   2   4   8

51 51 51 46 47
49 53 52 47 48
53 60 61 50 49
50 46 45 42 46
48 50 50 45 48
57 54 54 47 49
49 47 46 44 48
49 50 50 46 49
50 51 52 46 48
50 54 54 47 49
49 45 44 43 48
47 50 50 45 47
49 52 52 47 49
48 45 42 42 47
54 55 55 47 45
47 54 53 47 46

50.0 51.1 50.7 45.7 47.7 
 2.7  4.0  4.7  2.1  1.3

nnaida14

0.5  1   2   4   8

81 79 75 60 53
79 77 73 57 52
79 78 73 61 54
85 81 76 61 54
79 71 70 56 51
82 79 74 60 54
83 78 73 59 54
79 74 70 56 52
82 78 73 59 54
76 75 70 54 52
82 75 72 58 54
81 76 71 58 54
78 75 70 58 53
96 87 81 62 54
108 103 94 69 55
95 90 85 68 54

84.1 79.8 75.0 59.8 53.4
 8.5  7.8  6.5  4.0  1.1

* outlier ignored
** ground links LK3 & LK7 fitted to nnaida11-14 AIDA adaptor PCBs

electronic noise 

p+n *and* n+n strips ~ 55 ch FWHM ~ 0.7 * 55 ~ 39keV FWHM
=> slow comparator (5x sigma) ~ 5 * 39 / 2.355 ~ 82keV

cf.

See https://elog.ph.ed.ac.uk/AIDA/145

n+n strips ~64 ch FWHM ~ 0.7 * 64 ~ 45keV FWHM
=> slow comparator threshold (5x sigma) ~ 5 * 45 / 2.355 ~ 96keV
p+n strips ~ 54 ch FWHM ~ 0.7 * 54 ~ 38keV FWHM
=> slow comparator threshold (5x sigma) ~ 5 * 38 / 2.355 ~ 81keV


Pulser BNC PB-5 
Fall time 1.0ms
Rate 100Hz
Delay 250ns
Ampl 10.00000V
Polarity +
Pulse top Tail
Atten 10x
Clamp ON
- polarity via Cooknell SA1 Summing Amplifier
 
207Bi source, approx centred on DSSSD, approx 3cm from DSSSD
  
File R35
shaping time 8uS
slow comparator 6 (dec)
start: 13.26 stop: 13.50
spectra saved to disk 14.52 BST (sic)
Pulser amplitude 10.0000V-1.00000V @ 1.00000V step

During R30 ( see https://elog.ph.ed.ac.uk/AIDA/154 ) obtain the following merger error messages
(rate ~ 10 per minute) with merger rate ~100-200k data items/s 

Merge: Timestamp (611b2080877)[Q 2, Stream 2] is older than previous (611c207f4ef) [Q 2, Stream 2]
Merge: Attempting resynchronisation to timestamp 611c207f4f0 or greater
Merge: Last sync pulse time: 611c20400a0
Merge: Last timestamp seen: 611c207f4ef
Merge: Restarting at timestamp 611c72800a0
Merge: Timestamp (611f6f0101f)[Q 2, Stream 2] is older than previous (61206effe27) [Q 2, Stream 2]
Merge: Attempting resynchronisation to timestamp 61206effe28 or greater
Merge: Last sync pulse time: 61206ec00a0
Merge: Last timestamp seen: 61206effe27
Merge: Restarting at timestamp 612088000a0
Merge: Timestamp (61213ac1e1f)[Q 2, Stream 2] is older than previous (61223abffa7) [Q 2, Stream 2]
Merge: Attempting resynchronisation to timestamp 61223abffa8 or greater
Merge: Last sync pulse time: 61223a800a0
Merge: Last timestamp seen: 61223abffa7
Merge: Restarting at timestamp 6122ab400a0

611c72800a0-611c207f4ef = 5200BB1 = 85986225 * 1e-8 = 0.86s

612088000a0-61206effe27 = 1900279 = 0.26s 

6122ab400a0-61223abffa7 = 70800F9 = 1.2s

Resynchronisation appears to require significant periods of time (~s) - why?

I assume this implies significant dead time (data loss) too?

MSL type BB18(DS)-1000 serial 2998-22
Bias +200V, I_L +=6.200uA, ambient temperature +20.1 deg C
 
DSSSD - AIDA adaptor PCB cabling
 
4 off LH Coupler (Kapton PCB, 5cm), 2x 34-way Samtec ribbon cable (45cm), RH coupler(Kapton PCB, 10cm)
 + 3M 1245 1.4mil copper foil screen ribbon cables + RH coupler only (i.e. not LH coupler)
 + drain wires -> gold-plated Lemo-00 test input connectors 
 
nnaida 11 & 12 AIDA adaptor PCB rev B
nnaida 13 & 14 AIDA adaptor PCB rev C (LK1 fitted) 
ground links LK3 & LK7 fitted to nnaida11-14 AIDA adaptor PCBs

Heavy duty copper cable connects copper front end frames of FEE modules
Nitto 5011N conductive gasket between FEE module and front end frames
 
Standard ASIC settings
 nnaida 11 & 12 - negative input
 nnaida 13 & 14 - positive input
 
Pulser BNC PB-5 
Fall time 1.0ms
Rate 100Hz
Delay 250ns
Ampl 5.00000V
Polarity +
Pulse top Tail
Atten 10x
Clamp ON
- polarity via Cooknell SA1 Summing Amplifier
 
207Bi source, approx centred on DSSSD, approx 3cm from DSSSD
  
File R30
shaping time 8uS
slow comparator 6 (dec)
start: 10.21 stop: 15.09
spectra saved to disk 16.10 BST (sic)
Pulser OFF

see attachments 1-4 (stat & rate hit patterns)

File R33
shaping time 8uS
slow comparator 5 (dec)
start: 16.03 stop: 17.44
spectra saved to disk 18.45 BST (sic)
Pulser OFF

Connect DSSSD-AIDA adaptor PCB screened cabling drain wires to adaptor PCB
mounting holes and secure with M3 socket bolts. With introduction of conductive
gasket should be equivalent to previous grounding via crocodile clips and gold-plated
Lemo-00 test input connectors.
 
18.19 Bias +200V, I_L +=6.760uA, ambient temperature +20.2 deg C

File R34
shaping time 8uS
slow comparator 8 (dec)
start: 18.34 stop: 10.19 19.2.16
spectra saved to disk 11.20 BST (sic)
Pulser OFF

see attachments 5-8

Attachments 9 & 10

DSSSD energy (~10keV/ch) versus DSSSD strip # 
Note some eveidence for non-linearity at low amplitude for p+n strips (128-255) cf. n+n strips
(0-127)

Projection of above showing energy spectrum for one strip. Can observe 478 and 975keV K-lines
and prominent Landau peak near threshold. Threshold estimated at ~80-100keV (slow comparator 0x8).

m(p+n strips) = m(n+n strips) = 1, E(p+n strip)-E(n+n strip) = +/- 100keV

Enegy spectra ADC offset correct, no relative gain adjustment

Attachments 11, 12

Energy (p+n strip) versus E(n+n strip) 
~10keV/channel, m(p+n strips) = m(n+n strips) = 1, with & without equal energy gate

Attachments 13, 14 & 15

Raw hit pattern, m(n+n strips) and m(p+n strips)  

Attachment 16 - gzip'd tar file of sorted R34 spectra (see attachments 17 & 18)

Attachment 17 - FORTRAN user subroutine

Attachment 18 - ADC offset variables used by FORTRAN user subroutine

Attachment 19 - ADC offsets

File R17 -> pulser walkthrough.
     - Started ~10.00
     - Pulser peak amplitude taken from 9.0V to 1.0 V in 1.0V steps
     - Shaping time 8us, slow disc threshold 0x8
     - File stopped 10.32. Spectra (.msf) saved 10.34
 
File R18 -> pulser walkthrough.
      - Started 10.41.
      - Stepped the pulser amp by 0.1V - too small.
      - Not useful
      - Stopped 10.50

File R19 - pulser walkthrough.
       - Started 10.51
       - empty

File R20 - empty

File R21 -> pulser Walkthrough
     - started 11.18
     - 1.0 - 0.2V in 0.2V steps.
     - Stopped 11.50. Saved histograms 11.51.

File R22 -> source spectrum.
    - slow comp threshold @ 0x7
    - forgot to turn off pulser. => no good.

file R23 -> source spectrum.
    - slow comp threshold @ 0x7
    - started 16.09

18.05 DAQ found stalled, nnaida11 non-responsive
      FORCE reset nnaida11 OK
      but SETUP and FORCE setup failed with timeouts

      Power-cycled all FEE modules to restart

eventual restart following workstation restart

file R29
start 18.50 stop: 09.55 18.2.16
spectra saved to disk 10.55 BST (sic) 
see attachments 1-6

09.56 bias +200V I_L +6.105uA ambient temperature 20.1 deg C

MSL type BB18(DS)-1000 serial 2998-22
Bias +200V, I_L +=6.150uA, ambient temperature +20.1 deg C
 
DSSSD - AIDA adaptor PCB cabling
 
4 off LH Coupler (Kapton PCB, 5cm), 2x 34-way Samtec ribbon cable (45cm), RH coupler(Kapton PCB, 10cm)
 + 3M 1245 1.4mil copper foil screen ribbon cables + RH coupler only (i.e. not LH coupler)
 + drain wires -> gold-plated Lemo-00 test input connectors 
 
nnaida 11 & 12 AIDA adaptor PCB rev B
nnaida 13 & 14 AIDA adaptor PCB rev C (LK1 fitted) 
ground links LK3 & LK7 fitted to nnaida11-14 AIDA adaptor PCBs

Heavy duty copper cable connects copper front end frames of FEE modules
Nitto 5011N conductive gasket between FEE module and front end frames
 
Standard ASIC settings
 nnaida 11 & 12 - negative input
 nnaida 13 & 14 - positive input
 
Pulser BNC PB-5 
Fall time 1.0ms
Rate 100Hz
Delay 250ns
Ampl 5.00000V
Polarity +
Pulse top Tail
Atten 10x
Clamp ON
- polarity via Cooknell SA1 Summing Amplifier
 
207Bi source, approx centred on DSSSD, approx 3cm from DSSSD
  
File R16
shaping time 8uS
slow comparator 8 (dec)
start: 16.2.16 13.15 stop: 09.30 17.2.16
spectra saved to disk 10.30 BST (sic)
Pulser OFF

16.2.16

09.35  Bias +200V, I_L +=5.940uA, ambient temperature +20.0 deg C

MSL type BB18(DS)-1000 serial 2998-22
Bias +200V, I_L +=6.540uA, ambient temperature +19.9 deg C
 
DSSSD - AIDA adaptor PCB cabling
 
4 off LH Coupler (Kapton PCB, 5cm), 2x 34-way Samtec ribbon cable (45cm), RH coupler(Kapton PCB, 10cm)
 + 3M 1245 1.4mil copper foil screen ribbon cables + RH coupler only (i.e. not LH coupler)
 + drain wires -> gold-plated Lemo-00 test input connectors 
 
nnaida 11 & 12 AIDA adaptor PCB rev B
nnaida 13 & 14 AIDA adaptor PCB rev C (LK1 fitted) 
ground links LK3 & LK7 fitted to nnaida11-14 AIDA adaptor PCBs

Heavy duty copper cable connects copper front end frames of FEE modules
Nitto 5011N conductive gasket between FEE module and front end frames
 
Standard ASIC settings
 nnaida 11 & 12 - negative input
 nnaida 13 & 14 - positive input
 
Pulser BNC PB-5 
Fall time 1.0ms
Rate 100Hz
Delay 250ns
Ampl 5.00000V
Polarity +
Pulse top Tail
Atten 10x
Clamp ON
- polarity via Cooknell SA1 Summing Amplifier
 
207Bi source, approx centred on DSSSD, approx 2cm from DSSSD
 
File R5
shaping time 0.5us
slow comparator 16 (dec)
 
File R6
shaping time 8us
slow comparator 16 (dec)
start: stop: 18.01
 
File R7
shaping time 8uS
slow comparator 12 (dec)
start: 18.02 stop: 09.29 10.2.16
spectra saved to disk 11.37 BST (sic)
 
10.2.16
-------
 
10.50 Bias +200V, I_L +=6.010uA, ambient temperature +20.0 deg C
 
File R8
shaping time 8uS
slow comparator 10 (dec)
start: 10.52 stop: 13.12 
spectra saved to disk 14.13 BST (sic)
 
attachments 1 & 2 - hit patterns during R8

DAQ stalled at start of R9
Run control (updated) showed all FEEs going
No good events from nnaida12 & 14, nnaida11 & 13 OK
nnaida would not stop, would not reset
Power cycle to restart

Ignore R9

File R10
shaping time 8uS
slow comparator 10 (dec)
start: 13.27  stop: 14.09
spectra saved to disk 15.10 BST (sic)
Pulser walkthrough 9.00000V-1.00000V @ 1.0000V step

see attachment 3

File R11
shaping time 8uS
slow comparator 10 (dec)
start:  14.12 stop: 14.38
spectra saved to disk 15.39 BST (sic)
Pulser walkthrough 1.00000V-0.200000 @ 0.1000V step

See attachment 4 & 5

Ignore R12 - same issue as before R9

File R13
shaping time 8uS
slow comparator 8 (dec)
start:  14.50 stop: 15.11
Pulser amplitude 5.00000V

File R14
shaping time 8uS
slow comparator 8 (dec)
start:  15.12 stop: 15.20
Pulser amplitude 5.00000V & 0.20000V

File R15
shaping time 8uS
slow comparator 8 (dec)
start:  15.20 stop: 15.28
spectra saved to disk 16.33 BST (sic)
Pulser amplitude 0.10000V & 1.00000V
see attachments 6 & 7

For slow comaparator setting 8 (dec) and with the above BNC PB-5 pulser settings above
the slow comparator rate decreases from the expected 100Hz (plus source) to < 50Hz
between pulser amplitude 0.20000 and 0.10000V. 


15.32 Bias +200V, I_L +=6.550uA, ambient temperature +19.6 deg C

08/02/16

Spoke to PJC-S -> Ethernet cables from FEEs to switch are all 4m Cat6.

System powered on with bias to detector of +200V and leakage current of 6.4uA at room temp 19.0oC.

Double peaking present again in nnaida11/12 -> individual peaks @ ~100ch FWHM with separation ~150ch @ 2us shaping time.

Double peaking also present in nnaida13/14 -> indiv peaks ~100ch FWHM and separation ~90ch.

Changing grounding had no effect.

Made ribbon cable with 2 separately shielded halves plus connecting Cu tape strip at FEE and + drain wire in contact with both halves - single peaks - widths of ~110-160ch.

09/02/16

Added conductive gasket to Cu mount blocks

      - resistance between Cu and gasket ~0.2 Ohms (probe-to-probe = 0.16 Ohms)

      - LEMO connector to Cu mount block ~0.35 Ohms

      - LEMO to LEMO (between adapter PCBs) ~0.55 Ohms (connected by heavy duty Cu braid)

Powered system on. Bias of +200V and leakage current = 5.5uA @ room temp 19.5oC.

With gasket added and heavy duty Cu braid between mount blocks, pulser FWHM in nnaida11 ~ 62ch and in nnaida13 ~72ch at shaping time of 8us.

Investigated effect of shaping time on peak FWHM (avg width found from average of 1.(6,8,10,12).L for each FEE.     (see attachments)

    Shaping time (us)    |     nnaida11    |     nnaida12    |     nnaida13     |     nnaida14    

                0.5                   |          95*          |           108*       |          126*        |          99*

                1.0                   |          82            |           116**     |          130^        |         110**  

                2.0                   |           68           |            83^        |           110^       |           92^

                4.0                   |           60           |            77          |             85'        |           90

                8.0                   |            56          |             63         |              77        |            64

     * = all peaks single and Gaussian looking

     ** = not all peaks Gaussian, some flat or sloped top 

     ^ = double peaks, widths estimated from tallest peak

     ' = flat topped

01/02/16

Started up system. Biased det to +200V 

Bias +200V, I_L +6.955uA, ambient temp +20.2 deg C

MSL type BB18(DS)-1000 2998-20

~42kBq 207Bi source ~3cm from DSSSD centre

Standard ASIC settings
 shaping time 8us

BNC PB-5
 frequency 100Hz
 amplitude 5.0000V
 x10 attenuation

Slow comparator 16 (dec) - saved to disk c. 18.58 BST (sic) 2.2.16

Slow comparator 10 (dec) - saved to disk c. 10.49 BST (sic) 3.2.16

10.54 3.2.16 I_L +6.305uA, ambient temp +20.1 deg C

Slow comparator 22 (dec) - saved to disk c. c. 12.31 BST (sic) 3.2.16 - see attachment 1

Slow comparator 16 (dec) - saved to disk c. c. 13.04 BST (sic) 3.2.16 - see attachment 2

Slow comparator 12 (dec) - saved to disk c. c. 14.15 BST (sic) 3.2.16 - see attachment 3

Slow comparator 10 (dec) - data to disk file R1 - see attachment 4
start:  stop: 14.20
AIDA adaptor PCB ground links not fitted


Slow comparator 10 (dec) - data to disk file R2 - see attachment 5
start: 14.20 stop: 14.53
4x ground links fitted
14.22 3.2.16 I_L +6.625uA ambient temp +20.2 deg C


Slow comparator 10 (dec) - data to disk file R3 - see attachment 6
                           spectra to disk at 16.19 BST (sic) 3.2.16
start: 14.55 stop: 15.14
4x ground links fitted
BNC PB-5
 amplitudes 9.00000 - 1.00000 @ 1.00000V step 


Slow comparator 9 (dec) - data to disk file R4 - see attachment 7-9
start: 15.22 stop: 16.55
BNC PB-5
 amplitude 5.00000V

From attachments 7-8 we can observe that rates (pulser @ 100Hz + 207Bi) are
generally sensible with slow comparator threshold = 9 (dec). Overall, merge
data rates ~110k data items / s.

Quick calculation suggests threshold (keV) ~ slow comparator setting * 10 

Currently running with a source, and everything seems to be running fine in terms of histograms doing what we expect, no error messages etc.

Tried to start the merger and tape server, but the merger reports as waiting for the first SYNC.

Checked the stats page and sure enough, no SYCs are being produced.

Performed a re-sync from the MasterTS page but nothing changed.

 25/01/16

On start up, received error when trying to access spectrum browser (attachment 1)   => required restart of 'Http for AIDA'

At 2us shaping time, and all other setting as last week, the situation remains the same

    - nnaida11 has width ~50ch, nnaida12 has width ~300ch, nnaida13 is quad peaked and nnaida14 is not quite Gaussian but has width of ~80ch (possibly two peaks very close together)

Change shaping time to 8us.

Swap cables to see if the cable is the source. Currently have two LH coupler + shielded ribbon cables connected to nnaida11/13 (11 good performance, 13 quad peaked)

     - swapped the ribbon cables over but left the couplers where they were to see if the good performance is a consequence of something intrinsic to a particular ribbon or coupler.

     - nnaida11 now has width ~40ch                  (attachment 2)

     - nnaida13 now back to double peaked       (attachment 3)

     - inconclusive.

Could old style kapton laid next to nnaida11 be shielding it due to the built in screen? (the kapton is laid against the ribbon cable)

     - removing the kapton makes no difference to widths, other than nnaida12 which comes down to ~15ch (as expected)

Clipping cable ends together makes no difference, and no combination of jumpers could improve the widths.

Bending cables through 90 degrees makes no difference either (if they were acting as aerials).

Swapped complete PCBs with cables still in place over. Test first thing tomorrow.

26/01/16

Swapping PCBs produced no difference

     - nnaida11 has widths of ~50-60ch, although some structure visible in some peaks

     - nnaida14 sees double peaks.

Clipping ribbon ends together now makes things worse.

Swapped PSU cables to nnaida11/14

     - nnaida11 now marginally worse @ ~70ch width

     - nnaida14 sees no obvious change

Connected PSU chasis to NIM crate - no change.

Added two more ribbon + HL/RH couplers to system. Now:

      - nnaida11 = LH + ribbon

      - nnaida12 = LH + ribbon + RH

      - nnaida13 = LH + ribbon + RH

      - nnaida14 = LH + ribon

Clipped drain wire to LEMO connectors on PCB instead of pulser BNC cable.

See marked improvement in performance. All nnaida now have single Gaussian peaks with widths now:   (attachments 4-6)

       - nnaiada11 at ~35ch

       - nnaida12 at ~70ch

       - nnaida13 at ~80-120ch

       - nnaida14 at ~45-55ch (3 at ~80-150ch)

Added RH coupler to nnaida11/14, with thin braid taped over joint in shielding to reduced resistance

       - nnaida11 widths increase slightly to ~40-60ch

       - nnaida14 widths increase slightly to ~60-80ch, few round ~100-120

This is consistent with the RH coupler increasing widths by ~25ch, as seen in previous tests.

See occasional ripple through waveforms in nnaida11/14    (attachments 7-11).

      - expanded view shows period of 34 samples  ==> 680ns   ==> frequency ~1.5MHz

Variation with shaping time (avg peak width over a several channels):

* = some non-Gaussian peaks

Connected detector, biased to +200V (+ve core to nnaida12, -ve braid to nnaida14) with leakage current = 9uA.

At 8us shaping time, and with Lk1 fitted on nnaida13/14 RevC adapter, peaks across all nnaida have widths ~70ch and are all single Gaussian peaks.   (attachments 12-15)

MSL type BB18(DS)-1000 serial 2998-22
Bias +200V, I_L +8.110uA, ambient temperature +20.2 deg C

DSSSD - AIDA adaptor PCB cabling

4 off LH Coupler (Kapton PCB, 5cm), 2x 34-way Samtec ribbon cable (45cm), RH coupler(Kapton PCB, 10cm)
 + 3M 1245 1.4mil copper foil screen ribbon cables + RH coupler only (i.e. not LH coupler)
 + drain wires -> gold-plated Lemo-00 test input connectors 

nnaida 11 & 12 AIDA adaptor PCB rev B
nnaida 13 & 14 AIDA adaptor PCB rev C (LK1 fitted) 

Standard ASIC settings
 nnaida 11 & 12 - negative input
 nnaida 13 & 14 - positive input

Pulser BNC PB-5 
Fall time 1.0ms
Rate 100Hz
Delay 250ns
Ampl 5.00000V
Polarity +
Pulse top Tail
Atten 10x
Clamp ON
- polarity via Cooknell SA1 Summing Amplifier

Pulser peak width (ch FWHM) from spectra 2.*.L

nnaida11

Shaping time(us)

0.5  1   2   4   8   8**

80   83  76  82  87  82
82   84  77  82  87  83
82   80  77  82  79  75
75   77  73  77  91  87
79   81  76  78  90  88
79   81  76  80  90  85
72   77  73  83 100  98
82   81  79  88  99  94
81   81  79  86  94  96
84   84  77  86  93  94
76   87 100 325 557 828*
86   83  84 100 119 121*
83   83  82  92 108 106*
78   77  83  85 110 111*
98   81  96 105 119 123*
89   89  93 104 109 108*

81.6 81.8 81.3 82.4 91.0 88.2 mean
6.0  3.4  8.2  3.5  6.1  7.3  std dev

nnaida12

0.5  1   2   4   8   8**

72   79  70  68  65  62
77   81  74  73  70  70
81   85  77  76  70  70
66   74  64  63  62  63
73   79  71  69  63  65
75   83  73  70  64  65
65   74  65  64  63  63
70   74  68  66  65  65
73   79  69  68  64  65
78   80  76  72  67  65
61   72  61  60  61  62
69   77  68  61  63  63
74   80  71  68  66  66
64   69  63  61  61  62
74   83  72  67  58  57
75   82  72  70  62  64

71.7 78.2 69.6 67.3 64.0 64.2
5.5  4.5  4.6  4.6  3.2  3.1

nnaida13

0.5  1   2   4   8   8**

71   72  72  63  54  53
75   80  76  64  56  54
77   86  83  67  56  56
61   66  60  57  52  51
69   74  71  62  55  52
74   77  75  64  56  53
59   65  60  57  53  52
66   70  68  60  55  54
66   65  67  60  53  53
72   75  75  59  52  53
58   63  59  54  50  51
62   65  64  57  52  52
68   75  68  60  55  51
55   59  55  52  51  49
61   68  65  57  49  46
71   74  72  63  51  49

66.6 70.9 68.1 59.8 53.1 51.8
6.6  7.0  7.5  4.0  2.2  2.4

nnaida14

0.5  1   2   4   8   8**

68   76  68  64  56  54
69   76  73  48  56  51
68   77  72  66  56  53
67   75  70  66  54  52
68   77  70  57  54  49
69   77  71  66  56  53
65   76  69  65  56  55
66   75  67  65  54  54
67   76  68  65  57  53
70   79  74  67  46  48
66   76  68  64  53  53
65   75  68  64  56  54
69   77  70  66  52  56
70   81  73  69  57  54
81   96  82  74  54  50
74   84  78  71  54  52

68.9 78.3 71.3 64.8 54.4 52.6
3.9  5.3  4.0  5.8  2.7  2.2

* outlier ignored
** ground links LK3 & LK7 fitted to nnaida11-14 AIDA adaptor PCBs

electronic noise 

n+n strips ~64 ch FWHM ~ 0.7 * 64 ~ 45keV FWHM
=> slow comparator threshold (5x sigma) ~ 5 * 45 / 2.355 ~ 96keV

p+n strips ~ 54 ch FWHM ~ 0.7 * 54 ~ 38keV FWHM
=> slow comparator threshold (5x sigma) ~ 5 * 38 / 2.355 ~ 81keV

 18/01/16

Set up as last week but with 8us shaping time.

With detector connected, still seeing rail-to-rail noise on waveforms in nnaida13 and double peaking in all nnaida.

Measured various resistances around the system to gauge quality of grounding connections (all measured in Ohms).

     - NIM crate to PCB LEMO connector:                                        4.8

     - NIM crate to mezzanine Cu block:                                           5.3    -> Plastic guide pins now installed.

     - Between LEMO connectors on the adapter boards:           0.19

     - nnaida11/12 drain wire to nnaida13/14 drain wire:            0.25

     - RH coupler nnaida13 to RH coupler nnaida11:                  1.4

     - LEMO to ribbon shielding nnaida13:                                     0.2

     - LEMO to RH coupler shielding nnaida13:                            0.4

Double peaking not seen in RIKEN or by PCS during his tests -> most likely pickup of external noise.

Connected multiple different cable types to see effect they have on the sinusoidal wave seen in the waveforms and on the double peaking.

       - nnaida11: LH coupler (not shielded) + 45cm ribbon (shielded) + RH coupler (shielded)

       - nnaida12: LH coupler (not shielded) + 45cm ribbon (shielded)

       - nnaida13: old style 90cm kapton (19/02/14 revision)

       - nnaida14: 45cm thin kapton (shielded) with foil over loose end

Setting as last week, with 2us shaping time.

Peak -to-peak differences in all nnaida for several channels:

               |   nnaida11    |                       nnaida12                    |   nnaida13   |   nnaida14    

    1.4.L  |       157          |                           123                           |         160        |   single peak of width ~400ch

    1.6.L  |      119           |                            111                          |         170        |       "                             "

    1.8.L  |        72           |  Flat top single peak, width ~35    |         155        |      "                             "

   1.10.L |       90            |    "                                             " 42    |         177        |       "                             "                 -> Noticed after cable gnd jumper was not connected on nnaida14 and needs to be for these kaptons. Explains v. large peak width. (Attachments 3-5)

19/01/16

Swapped cables on nnaida11 and nnaida13. Now have:

       - nnaida11: old style 90cm kapton (19/02/14 revision)

       - nnaida12: LH coupler (not shielded) + 45cm ribbon (shielded)

       - nnaida13: LH coupler (not shielded) + 45cm ribbon (shielded) + RH coupler (shielded)

       - nnaida14: 45cm thin kapton (shielded) with foil over loose end

In nnaida13 see ripple on baseline of waveform with period ~30ch = 600ns (@20ns per ch) => frequency of 1.67 MHz.  (Attachment 6+7)
 

Resistance between drain wire end and ribbon shielding on nnaida13 cabele:   ~0.8 Ohms.

        "                                                          "     RH coupler shielding on nnaida13:    ~1.1 Ohms.

For shielded ribbon cable on nnaida13, see fairly flat waveforms. High frequency transients pass through, but no sign of sinusoidal wave over time window of 6us.   (Attachment 9)

After swapping cables on nnaida11 and nnaida13 (only change to system), now see single, Gaussian peaks in nnaida12 with widths ~40ch.

For nnaida12:

           Shaping time (us)     |     Avg peak width (ch)        (avg of 1.8/9/10/11.L peak widths)

                      0.5                     |                   35

                      1.0                     |                   39      (1.11 width ~50ch, all others ~37-42)

                      2.0                     |                   39      (   "                                                      "     )

                      4.0                     |                   35      (1.11 width ~45ch, all others ~32-38)

                      8.0                     |                   37

At 8us shaping time: in nnaida11 (old style cable), see single pulser peak of width ~150 ch.

                                           nnaida13, still see double peaking with peak separation of ~90ch and an extra structure, like a small shoulder, on the outside of the peaks.    (Attachments 8+10)

                                           nnaida14, not fully double peaked, more a peak with a shoulder ~40ch apart.

At 2us shaping time: in nnaida11, pusler peak width back to ~300ch.

                                           nnaida13, retains extra structure on outside of peaks, but peak searation increased to ~150ch.

                                           nnaida14, double peaked, with peak separation of ~65ch.

(Attachments 11-15)

Cannot see waveforms on nnaida12, so swapped cables with nnaida11. Also acts as test of whether the good performance seen in nnaida12 follows the cables or is something to do with the FEE.

Now have:

       - nnaida11: LH coupler (not shielded) + 45cm ribbon (shielded)

       - nnaida12:  old style 90cm kapton (19/02/14 revision)

Now see some Gaussian peaks in nnaida11 with width of ~60ch @2us shaping time, however some peaks seem to have a slight shoulder.

      > suggests issue causing double-peaking is still present (and likely was in nnaida12), but is more/less apparent in some channels than others.

Questions:

     ** Is this just a very well shielded cable, or something to do with the intrinsic properties of this specific cable?

     ** What happens if a RH coupler is added?

     ** What happens if the RH coupler is removed from the cable connected to nnaida13?

Added RH coupler to cable on nnaida11.

Measured some resistances of the shielding on the nnaida11 (good performance - single peaks) cable and the nnaida13 (double peaks) cable:

       - drain wire to far end of shielding:      nnaida11 = 0.2 Ohms           nnaida13 = 0.2 Ohms

       - drain wire to RH coupler:                    nnaida11 = 0.4 Ohms            nnaida13 = 0.5 Ohms

       - far end of nnaida11 cable shielding to far end of nnaida13 cable shielding:     0.05 Ohms   (this seems wrong considering pushing the multimeter probes together gets 0.14 Ohms, but was repeated several times and was always 0.05 Ohms)

With addition of RH coupler to nnaida11 (and shaping time still at 2us):       (Attachments 16+17)

     - nnaida11 peaks show slight shoulder and increased width of ~110ch.

     - nnaida12 now sees noise over full-scale range

     - nnaida13 now quad peaked.

     - nnaida14 still double peaked, but peak separation increased to ~150ch.

Removed RH coupler from nnaida11, all peaks go back to how they were previously, before its addition (Something is repeatable - excellent!)

     - some peaks in nnaida11 now non-Gaussian nad with widths ~130ch. Most Gaussian and width ~50ch.

Removed RH coupler from nnaida13:

    - no real change in the spectra of any nnaida    -> what is the difference between the cables on nnaida11/13???

Stock take of ribbon cables currently at DL:

     - 90cm                   = 16

     - 45cm                   = 16   (4 with me for testing in Edinburgh this week. Will be returned to DL next week)

     - LH couplers       = 10   (2 with me for testing in Edinburgh this week. Will be returned to DL next week)

     - RH couplers       = 10  (2 with me for testing in Edinburgh this week. Will be returned to DL next week) 

Spectrum Browser

y expand by manual entry of values to YMin/YMax does not work unless the spectrum
has first been expanded/moved using the Expand/Contract Y or Move View up/down
buttons. 

Also, the only spectrum affected by manual entry of values to YMin/YMax or
XMin/XMax is the 'current' spectrum (gallery) regardless of current/all gallery
setting.

11.58 Repeat yesterday's test - no significant change observed

nnaida11 - input -, shaping time 2us - attachment 1
nnaida14 - input +, shaping time 2us - attachment 2


15.20 invert input polarity - no significant change observed

nnaida11 - input +, shaping time 2us - attachment 3
nnaida14 - input -, shaping time 2us - attachment 4

Note - nnaida11 1.12.L pulser peak width ~45 ch FWHM (integrate)

Test conducted yesterday and today suggest that it is the grounding and/or
the AIDA adaptor PCB that is significant - *not* the particular LH coupler
+ 2x 34-way ribbon cable + 3M 1245 Cu foil screen assembly or FEE64 polarity

Current AIDA adaptor PCB configuration
nnaida11 rev C, LK1 fitted
nnaida14 rev B, no links fitted


15.37 Add LK1 to nnaida14 AIDA adaptor PCB - no significant change

nnaida11 - input +, shaping time 2us - attachment 5
nnaida14 - input -, shaping time 2us - attachment 6

18.00 Swapped input cables to nnaida11 and nnaida14
      both cables LH coupler + 2x 34-way Samtec ribbon cables + 3M 1245 1.4mil Copper screen w/ground wire
      RH coupler not fitted 
      both ground wires tied to BNC cable from pulser to AIDA adaptor PCBs at BNC(F)-Lemo-00(M) adaptor

      Before swap, input cable attached to nnaida11 exhibited typical peak widths ~50 ch FWHM, cable
      attached to nnaida  exhibited double peaking and other structure

      This is unchanged following swap => grounding and/or AIDA adaptor PCB significant *not* cable

      See attachments 1-4 post swap  
       nnaida11 ASIC 2*L ~40-60 ch FWHM pulser peak width
       standard ASIC settings, shaping time 2us

 12/01/16      (Attachments 1-8)

FEEs set up as per ELOG entry 136 (15/12/15)

Connected cables as follows:

     - nnaida11 > LH coupler + 45cm ribbon (unshielded)

     - nnaida12 > no load (no waveforms from this card)

     - nnaida13 > LH coupler + 45cm ribbon (unshielded) + RH coupler

     - nnaida14 > LH coupler

Peak widths (ch):         <all with shaping time of 8us and heavy duty Cu braid between test inputs on each adapter card>

                     nnaida11  |  nnaida12  | nnaida13  |  nnaida14

     1.4.L   |        392       |       14.7       |      250       |      34.3 

     1.6.L   |       300        |       13.6       |      150       |      23.1

     1.8.L   |       290        |       13.0       |       123      |      16.8

    1.10.L  |       309        |       13.2       |       129      |  no output

     > widths greater than expected

     > thought it could possibly be due to pickup of external noise in the room so added Cu tape as shielding to cable connected to nnaida13 with drain wire connected to CU braid on pulser input

     > reduced peak with in nnaida13 to ~160ch

     > connecting far end of Cu shielding via a Cu braid to main Cu braid reduces this to ~130ch

     > connecting Cu shielding on RH coupler to main ribbon cable shielding with thin braid reduced this further to ~110ch

For nnaida13, see double peaking of pulser peak with all shaping times up to 2us. At 4us, see single peak of width ~160ch. At 8us, see single peak of width ~110ch.

13/01/16      (Attachments 9-20)

Set up system as yesterday.

With shaping time of 2us, nnaida13 does not show Gaussian peaks. Some peaks are double, others just single non-Gaussian peaks.

Yesterday peak-to-peak difference was ~150ch

    - added tin foil to loose coupler end and over connection between ribbon cable and RH coupler, as it was suspected it could be pickup of external noise

    - @ 2us shaping time, double peaks still present with p-2-p difference of ~130ch

    - clipped foil firmly to Cu shielding tape  >  no difference.

In nnaida14, see single roughly Gaussian peak of width ~15ch.

In nnaida11, see single peaks of widths ~250ch. At 8us this reduces to ~180ch.

Connecting the Lk7 jumper for nnaida13 produces no difference.

Added full LH coupler + 45cm ribbon + RH coupler to all nnaida, with full shielding > no improvement.

Connected all to detector and saw no improvements, in fact increased noise in nnaida13 dramatically (see waveforms)

See low frequency wave in waveforms, will work next week to try remove this as this could be what is causing the double peaking and hiding the true capabilities of the cables.

 I would recommend changing the network cables for unshielded versions to remove a potential ground connection.