Note 60Co source (current activity c. 43kBq) was installed yesterday evening - assume it is positioned on the bottom side of the snout as per the other sources used this week/

04.17 DSSSD bias & leakage current OK - Grafana - attachment 1

      FEE64 temperatures OK - attachment 2
       aida02 ASIC temp known to be u/s

      ADC data item stats - attachment 3
       all FEE64 slow comparators 0x14 from yesterday's pulser walkthroughs

      per FEE64 Rate spectra - attachment 4

      Merger etc - attachment 5


11.24 DSSSD bias & leakage current OK - Grafana - attachment 6

      FEE64 temperatures OK - attachment 7
       aida02 ASIC temp known to be u/s

      ADC data item stats - attachment 8
       all FEE64 slow comparators 0x14 from yesterday's pulser walkthroughs

      per FEE64 Rate spectra - attachment 9

      Merger etc - attachment 10


17.50 DSSSD bias & leakage current OK - Grafana - attachment 11

      FEE64 temperatures OK - attachment 12
       aida02 ASIC temp known to be u/s

      ALl syhstem wide checks OK *except* WR/FPGA errors - attachments 13-14

      WR timestamps OK - attachment 15

      per FEE64 Rate spectra - attachment 16

      per FEE64 1.8.W spectra - 20us FSR - attachments 17-18

      Merger, TapeServer, Data Links - attachments 19-20
       no data storage

      ADC data item stats - attachment 21
       all FEE64 slow comparators 0x14 from yesterday's pulser walkthroughs


18.01 Grafana alerting shows detail of DSSSD leakage current and S4 temperature variations over time - attachment  22
       DEGAS LN2 fill cycle every 6h 10.00 - 16.00 - 22.00 ... etc

https://despec-vm-01.gsi.de/grafana/d/tHRVJYfGz/aida-alerting?orgId=1

12.00 Replaced AIDA ASIC mezzanine of aida01 to fix issue with asic #3

      During replacement the HDMI connector of the adjacent FEE64 aida09 became disconnected from the FEE64 PCB
      aida09 ( MAC ee:10 ) replaced (MAC 41:cf:ad )

      AIDA FEE64 adaptor PCBs for aida01, aida14 and aida09 disconnected and re-connected during this process 

      DSSSD bias & leakage current OK - attachment 1

      FEE64 temps OK - attachment 2
       *except* aida02 ASIC temp - known fault

      System wide checks OK *except* WR/FPGA errors - attachments 3-4

      WR timestamps OK - attachment 5

      ADC, DISC, PAUSE, RESUME and correlation data stats - attachments 6-10
       ADC data items 10/16 < 20k, max 143k

      per FEE64 Rate spectra - attachment 11

      per FEE64 1.8.W spectra - 20us FSR - attachments 12-13


15.10 Synchronise ASIC clocks
      Re-calibrate ALL ADCs 

      ASIC settings 2024Mar27-11.25.32

      Changes ( https://elog.ph.ed.ac.uk/CARME/499 )

       IBias LF feedback from 0xf to 0x8
       Diode link threshold from 0xbf to 0xca

      New ASIC settings saved as 2024Apr19-15.22.49

      All FEE64 slow comparators -> 0x14

      Data file S100_alpha/R12

      Pulser ealkthrough (test +)

      BNC PB-5 settings
 
      Amplitude 10.0-1.0V @ 1.0V step
      Attenuation x10
      Frequency 25Hz
      Polarity +
      Tail pulse
      tau_d 1ms

16.35 DAQ ends OK file S100_alpha/R12_24

      per p+n FEE64 1.8.L spectra - attachment 14
       aida09 pulser peak width 54 ch FWHM 

17.38 Data file S100_alpha/R13

      Pulser walkthrough (test -)

      BNC PB-5 settings
 
      Amplitude 10.0-1.0V @ 1.0V step
      Attenuation x10
      Frequency 25Hz
      Polarity -
      Tail pulse
      tau_d 1ms

18.43 DAQ ends OK file S100_alpha/R13_20

      per p+n FEE64 1.8.L spectra - attachment 15

18.55 Current status

      FEE64 power ON
      DSSSD bias ON

      All FEE64 slow comparator 0x14

      DAQ going -> Merger -> TapeServer (no storage mode) -> MBS ( but data stream not yet being read by MBS )


To Do

- S4 currently closed/controlled access for FRS startup

If we have access to S4 tomorrow

- switch test - to test + ( not critical )
- test AIDA interlock 
- further alpha background?



22.47 DSSSD bias & leakage current OK - attachments 16-17

      FEE64 temps OK - attachment 18
       *except* aida02 ASIC temp - known fault

      ADC data item stats - attachment 19

      per FEE64 Rate spectra - attachment 20

      Data link, Tape Server & Merger - attachments 21-23

       

03.30


09.10



09.25 data file S100_alpha/R11
   
      BNC PB-5 pulser data

      amplitude 10.0V
      attenuation x10
      tau_d = 1ms
      polarity - ( initially + )
      frequency 25Hz

      ASIC settings2024Mar27-11.25.32
       slow comparator 0x64 all FEE64s


      aida02 pulser peak width 129 ch FWHM

      polsrity +

      aida09 pulser peak width 57 ch FWHM


09.40 switch to no storage

      p+n FEE64 slow comparators 0x64 -> 0xa
      n+n FEE64 slow comparators 0x64 -> 0xf

      radioactive source 152Eu 370kBq installed on the bottom side of the snout, centred tranversely, located beneath bplas-DSSSD-DSSSD-bplas position.

      ADC data item stats - attachment 35
      9/16 < 20k, max 108k

      per FEE64 Rate spectra - attachment 36

10.44 152Eu source removed

      ADC data item stats - attachment 37
      9/16 < 20k, max 102k

      per FEE64 Rate spectra - attachment 38

WR timestamps appear to be OK but readout times fort aida03, aida04 and aida09 appear to be out of sequence. Attachment 1-3.

Reseated HDMI cable of aida09 and performed complete powercycle. Check the MACB HDMI port (appears to be loose) - still no change aida09 not collecting WR timestamps. Attachment 4-5.

09.52 DAQ continues file S100_alpha/R5
       note merger not functioning correctly due to aida03, aida04 & aida09 out of WR sequence 

      DSSSD bias & leakage current OK - attachment 1

      FEE64 temps OK - attachment 2
      *except* aida02 ASIC temp which is known to be u/s

      WR timestamps - attachment 3
       aida03, aida04 & aida09 out of sequence

      All system wide checks OK *except* ADC calibratio/FPGA/WR decoder status - attachments 4-6

      ADC data item stats - attachment 7

      per FEE64 Stat spectra - attachment 8

      per FEE64 1.8.L spectra - attachments 9-10

      per FEE64 1.8.W spectra - 20us FSR - attachments 11-12

      Merger, TapeServer & Link Data Rates - attachments 13-15

      Grafana - attachment 16
       DSSSD bias/leakage current trends OK


19.15 alpha background file S100_alpha/R10

      DSSSD bias & leakage current OK - attachment 17

      FEE64 temps OK - attachment 18
      *except* aida02 ASIC temp which is known to be u/s

      All system wide checks OK *except* ADC calibratio/FPGA/WR decoder status - attachments 19-21

      WR timestamps OK - attachment 22

      ADC data item stats - attachment 23

      Merger, TapeServer & Meger stats - attachments 24-26
       data rate c. 2.8Mb/s

      per FEE64 1.8.W spectra - 20us FSR - attachments 27-28

      correlation scaler stats & data link stats - attachments 29-30
       data rate dominated by MACB scaler inputs aida03 & aida04 ( c. 200kHz each )


22.16 DAQ continues Ok file S100_alpha/R10_35

      Merger, TapeServer & Meger stats - attachments 31-33
       data rate c. 2.8Mb/s

      ADC data item stats - attachment 34

      FEE64 temps OK - attachment 35
      *except* aida02 ASIC temp which is known to be u/s

      DSSSD bias & leakage current OK - attachment 36

00.40 Observed zero data fron aida03, aida04, aida09
      WR timestamps offset from other FEE64s

      rebooted aida03, aida04, aida09
      no change
      see attachments 14-17



18.25 rebooted aida03, aida04, aida09, aida15

      system wide checks OK *except* aida15 ADC not calibrated, FPGA decoder errors aida02, aida03
      ADC data item stats - attachment 28
      WR timestamps OK - attachment 29

      data file S100_alpha/R5 - alpha background

      Merger and TapeServer - attachments 30-31
       c. 1Mb/s to disk

21.05 FEE64 temps OK - attachment 44
      *except* aida02 ASIC temp which is known to be u/s

      All system wide checks OK *except* aida15 ASDC not calibrated, WR timestam/FPGA errors - attachments 41-43

      WR timestamps- attachment 40
       aida03, aida04 and aida09 differ from other timestamps again

      Merger and TapeServer - attachments 38-39
       c. 0Mb/s to disk due to WR timestamp issues

      per 1.8.W spectra - 20us FSR - attachments 36-37

      per FEE64 Rate spectra - attachments 34-35

      per FEE64 1.8.L spectra - attachments 32-33

11.45 DSSSD bias & leakage current OK - attachments 9-10

      FEE64 temps OK - attachment 8
      *except* aida02 ASIC temp which is known to be u/s

      All system wide checks OK *except* aida02 and aida04 WR decoder/FPGA status errors - attachments 6-7
       HDMI cabling disturbed during platform move?

      WR timestamps OK - attachment 5

      ADC data item stats - attachment 4
        10/16 < 20k, max 115k

      per FEE64 Rate spectra - attachments 3

      per 1.8.W spectra - 20us FSR - attachments 1-2

11.58 BB7 preamps unplugged. Noise conditions OK. Did not change considerably.
      11/16 < 20k (aida09 has 1 hot channel), max 114k Attachments 11-12.

12:34 Detector powered down to bring to safe state to check HDMI cables of aida02 and aida03.

15:06 Reseated aida02 and aida03. No more FPGA timestamp error. See attachment 13-14.

      Rates and histograms look good for pulser walk through. Test + and test - connected. Currently, Attachment 16-17.
      Temp OK Attachment 15. Bias OK Attachment 18.

      Data links aida02 and aida08 missing (?)

16:30 All slow comparator thresholds set to 0x64 for alpha background run during platform freeze.

      Initial rates and histograms attachment 19 - 20. aida04 noisy in ASIC 1.

      Temps OK. Attachment 21.
      MBS disc and tape setup in atttachment 22-23.

9:40 started up AIDA. TEMP OK. Noise condition same as Saturday. Attachments 1-3.

9:56 BB7 premaps connected but not powered. Attahcment 4.

10:20 BB7 Preamps powered. Attachment 5.

Noise increased marginally, but still 10/16 <20kHz, max 130k.

15.15  per FEE64 Rate spectra - attachment 6

             ADC data item stats - attachment 7

           increased noise observed - 6/16 < 20k, max 300k 

17.10  per FEE64 1.8.W spectra - 20us FSR - attachments 8-9

            per FEE64 Rate spectra - attachment 10

             ADC data item stats - attachment 11

           increased noise observed - 7/16 < 20k, max 180k 

20.30  per FEE64 Rate spectra - attachment 12

             ADC data item stats - attachment 13

           status quo ante - 10/16 < 20k, max 130k 

          FEE64 power OFF

          DSSSD bias OFF

15:04 bPlast was left powered over night. Powering up to check noise conditions - also to check shifting of Germanium baseline (no change observed).

          TEMP OK.

          Noise condition the same as yesterday when platform was moved in. Noise in aida01 and aida09 due to single channel failures (?). Attachments 1-3.

          9/16 <20kHz, max 176k

15:30 Changed drainwires ground from 4V (Ch3) -> 29.5V (Ch4) out on R&SMP4040 PSU. Attachments 4-5.

          No change in noise observed.

          9/16 <20kHz, max 187k

15:49 Connected PN 300 ground to R&SMP4040 4V (Ch3) output. Noise decreased in many channels aida09 does not have a noisy channel anymore (??). Attachments 6-7.

          10/16 <20kHz, max 158k.

Current bPlast grounding scheme in attachments 8-9.

15:00 Platform in, biasing detector. Temp OK Attachment 1. test - Pulser OFF.

           Rates somewhat worse than last night - probable contact on grounding of snout. Attachment 3.

           Histograms okay, some FEE64s now have hot channels. Attachment 2.

           9/16 aidas < 20kHz - max rate 162k

18:06 - powering down detector for the weekend. Overall system is fine, some channels (hot channels) definitely picked up noise, but condition is overall stable over three hours. See atachments 4-5.

TO-DO (kicking the can down the road):

- Some work to do on noise, but we might have to accept the situation as it currently is.

- Implement bPlast trigger scheme. Set bPlast thresholds, get bPlast current draw undercontrol - observe AIDA noise.

- Try different grounding configuration:

    - Grounding drain wires to frame. Observe AIDA conditions.

    - Reconnect 4V out to R&SRMP4040 common ground with PN 300 PSU as well. Observe AIDA conditions.

TO-DO for 11.04.2024

- Try bringing bPlast drain wire ground back to the PSU ground for PN 300 and R&SRMP4040.

- Recheck the downstream detector bias and ground scheme.

-

9:27 Restarted AIDA and hit go at 9:54. Situation the same as it was in the evening of 10.04.2024. 10 out of 16 FEE64s in good condition. Waveforms of aida16,

        TEMP OK - HV OK. See attachments 1-6.

10:20 We grounded the output of the R&SRMP4040 to to the drain wire ground of the bPlast ribbon cables and the output of the PN 300 PSU that is powering the booster boards. Results given by attachments 7 -11. We only saw a marginal improvement in the overall noise condition.

10:32 We connected the ground of the frame to the drain wire ground, that is also mutually connected to the ground of the R&SRMP4040 output ground and PN 300 output ground. Results given by attachments ???. We did not see any improvement in the overal noise condition.

11.00 DSSSD HV OFF

          FEE64 power OFF

          Check seating of all adaptor PCBs and drain/ground wires secured - generally OK

          Restart

          1.8.W spectra - 20us FSR - attachments 15-16

          per FEE64 Rate spectra - attachment 17

           10/16 < 20k, max 110k

          ADC data item stats - attachment 18

          Incremental improvement.

11.45 DSSSD HV OFF

          FEE64 power OFF

          test - daisy chain removed

          Restart

          1.8.W spectra - 20us FSR - attachments 20-21

          per FEE64 Rate spectra - attachment 19

           10/16 < 20k, max 210k

          ADC data item stats - attachment 22

          overall somewhat worse

12.20 DSSSD HV OFF

          FEE64 power OFF

          Re-install test - daisy chain, Tighten aida04 DSSSD ribbon cable drain wire.

          Restart

          1.8.W spectra - 20us FSR - attachments 23-24

          per FEE64 Rate spectra - attachment 25

          ADC data item stats - attachment 26

           10/16 < 20k, max 110k

          Status quo ante

         aida04 & aida08 1*W & 2*W spectra - 200us FSR - attachments 27-31

           large transients observed for aida04 1*W - cable or ASIC fault?

         aida16 **W spectra - 200us FSR - attachments 32-35

           all channels apopear to be working but mix of high/low noise channels for asics #3-4, asics #1-2 all appear high noise

14.00 DSSSD HV OFF

          FEE64 power OFF

          Disconnect ribbon cables from aida04 adaptor PCB

          Restart

          n+n FEE64 1.8.W spectra - 20us FSR - attachments 37

          per FEE64 Rate spectra - attachment 36

          ADC data item stats - attachment 38

          Implies origin of large transients observed in aida04 asic#1 is downstream of the FEE64 adaptor PCB, i.e. ribbon cable or DSSSD.

14.40 DSSSD HV OFF

          FEE64 power OFF

          re-connect ribbon cables from aida04 adaptor PCB

          1x pin J2 slightly bent - straightended with screwdriver - FFSD connector insertion OK

          Restart

          n+n FEE64 1.8.W spectra - 20us FSR - attachments 40-41

          per FEE64 Rate spectra - attachment 42-43

          ADC data item stats - attachment 39

            10x < 20k, max 120k

           aida11 asic#4 1.8.W spectra - 200us FSR - attachment

             no large transients observed

           DSSSD #1 & #2 bias from -120V to -100V

            ADC data item stats - attachment 40

            9x < 20k, max 220k (aida08)

            per FEE64 Rate spectra - attachment 41

17.15 bPlas ON -

        Current bPlast ground configuration:

         bPlas current ground configuration - drainwires of all ribbon cables excluding short side (cont. with snout) are grounded back to the bPlast R&SRMP4040 PSU, on the 29 V output. 4 V PSU to booster boards are floating, output of PN 300 is grounded to the PSU. The mesytec PSU, that also powers bPlast SiPMs at

         29V is not grounded to anything but the frame. Snout is currently light tight, I suspect internal radiation from FATIMA.

         It is noted that bPlast current draw fluctuated significantly (+/- 300 mV) as a result of thresholds set to the detector. I tried to set the thresholds HIGH to stabilise the bPlast detector as the power draw is fluctuating greatly.         

          AIDA noise very good

            ADC data item stats - attachment 42

            12x < 20k, max 83k (aida04)

            per FEE64 Rate spectra - attachment 43

To Do list

- separate 29V (low current) and 4V (high current) return paths/ground refs

- The mesytec PSU that powers the bPlast detector  is running to frame, it might be an idea to ground ribbon c

09.38 CC completed install of Bplast driver PCBs yesterday evening.
      All flat ribbon cables connected - all drain wires grounded
      PSU on but not enabled - return terminals grounded to PSU front panel ground
      SiPm bias off

      Water pressure and temperature OK
      FEE64 power ON

      DSSSD bias & leakage current OK - attachment 1

      FEE64 temps OK - attachment 2
      *except* aida02 ASIC temp which is known to be u/s

      All system wide checks OK *except* aida02 and aida03 WR decoder status - attachment 3

      WR timestamps OK - attachment 4

      ADC data item stats - attachments 5

      per FEE64 Rate spectra - attachments 6-7

      per 1.8.W spectra - 20us FSR - attachments 8-11

      ASIC settings 2024Mar27-11.25.32
       LEC slow comparator p+n FEE64s 0xa, n+n FEE64s 0xf

      BNC PB-5 pulser - attachment 12



10.45 CC returns
      bPlas ON

      ADC data item stats - attachments 13
       8x < 20k, max c. 310k

      per FEE64 Rate spectra - attachments 14

      per 1.8.W spectra - 20us FSR - attachments 15-16

      downstream DSSSD n+n and bottom left & right p+n FEE64s noisy


11.40 per p+n FEE64 1.8.L spectra - attachment 17
       aida09 pulser peak width 55 ch FWHM ~38keV FWHM - no change cf. before installation of bPas *except* aida16


12.00 Photos of snout, bPlas driver PCBs, cabling, grounding and PSUs courtesy JB - attachments 18-27

      N.B outputs of PN300 PSU at base of AIDA support stand are *not* ground ref'd - attachment 23


12.20 Slow comparator -> 0x64
      Pulser OFF
      All histograms zero'd

13.17 JB: returned from lunch. Current status of AIDA modules given by attachment 29.

15.55 While bPlast thresholds were being set the noise increased substantially.

16.51 Replaced mezzanine of aida14, reinstalled and biasing detector. Resulting for noise conditions in the detector given by attachments 30-33.

17.31 With a multimeter it was found that there is continuity between the snout and the frame.

18.50 We tried to disconnect the cables of the short side of the bPlast detector and all of the grounds. This seemed to show an open line OL on the multimeter and whence connecting the bPlast grounds back excluding the short side ribbon cable grounds, the multimeter still read OL. 
      We also tried to wedge paper between the short side ribbon cable of bPlast and the snout, but this did not work, the detector still reading continuity between the frame, booster board and snout. 
      The results after booting up the detector again are given by the attachments 34-36. 
      The noise condition is appreciably better than before with 12 out of the 16 FEE64 modules with sub 20 kHz rates.
      Disconnect the BB7 preamp. ground from the frame.

18.54 We powered up bPlast. The noise condition three FEEs got worse, aida01, aida11 and 06. The problem may be associated with downstream grounding. The results are given by the attachments 37-43. 10 out of the 16 FEE64 modules showed sub 20 kHz rates.

19.07 We turned off the power supply on the base of the snout support. PN300 Attachment 23. Rates did not change - attachment 44.

19.10 We turned off the mesytec PSU that is located in the bPlast NIM crate. No change was observed in the rates - attachment 45.

19.13 We turned off the R&SRMP4040 PSU that is located above the AIDA crate. And the noise situation did not change attachment 46.

19.22 Leaving the R&SRMP4040 PSU off we turned back on the mesytec PSU and PN300 PSU, attachment 47.

Summary:

It is clear that with no continuity on the short side we are able to reduce the noise back to the scenario where bPlast was not connected. However, powering bPlast introduced substantial noise in both DSSSDs that did not go away when turning all the PSUs off. There might be some hysteresis in the system (this is just speculation).

The situation is still fair considering that 10 out of the 16 FEE64 modules are in the sub 20 kHz rate level (good noise condition).

TO-DO for 11.04.2024

- Try bringing bPlast ground back to the PSU ground.

- Recheck the downstream detector bias and ground scheme.
       

Disconnected test - pulser from aida08. Noise conditions improved slightly, probably less pulser events. (Attachments 1 & 2).

We recabled the dew point sensor and flow sensor for the water supply interlock to the FEE64s. When we tried to power up the interlock box, the PSU (charging block) LED was blinking indicating an internal power instability. We then plugged each of the sensors out and into the interlock box and found that the flow sensor was the source of the power supply issue.

The HDMI cable of aida04 appears to be broken or wobbly, but the signals still look the same after powering up again. The adaptor board was reseated.

Pulser peak of test - remeasured the peak in aida02 1.8.L and found the same result as before with 118 channels FWHM c. 95-100 keV FWHM energy resolution. (Attachment 3)

bPlast booster boards connected caused dramatic increase in the noise observed in AIDA. Grounding still needs to take place.

TO-DO for 10.04 - 11.04:

- aida04 asic #1 investigate noise
- aida14 asic #1 & asic #2 u/s? replace ASIC mezzanine?

- noise optimisation of aida-bplast -- (friday if BB7 also powered).

BNC PB-5 set to remote control

Login to RPi nnrpi2

ssh -X nnrpi2 -l pi

Start PB-5 app - attachment 1

./BNC-PB-5/pb5.py

09.36 Cooling water temperature and flow OK

      FEE64 power ON

      DSSSD bias & leakage current OK - attachment 1

      FEE64 temps OK - attachment 2
      *except* aida02 ASIC temp which is known to be u/s

      All system wide checks OK *except* aida02 and aida03 WR decoder status - attachment 3

      WR timestamps OK - attachment 4

      info code 4, correlation scaler, PAUSE, RESUME, DISC, ADC data item stats - attachments 5-10

      per FEE64 Rate spectra - attachments 11

      per 1.8.W spectra - 20us FSR - attachments 12-13

12.25 DSSSD bias & leakage current OK - attachment 16

      FEE64 temps OK - attachment 15
      *except* aida02 ASIC temp which is known to be u/s

      ADC data item stats - attachments 14

      system stable

17.32 Power and detector bias cycle

      DSSSD bias & leakage current OK - attachment 1

      FEE64 temperatures OK - attachment 2
       *except* aida02 ASIC temp u/s

      ASIC settings 2024Mar27-11.25.32
       slow comparator p+n FEE64s 0xa (100keV), n+n FEE64s 0xf (150keV)

      BNC PB-5 pulser
      amplitude 10.0V
      attenuation x10
      frequency 25Hz
      polarity -
      tau_d 1ms
      tail pulse

      test - distributed by daisy chain to n+n FEE64s - chain terminated by 50 Ohm - currently connected to pulser

      test + distributed by daisy chain to p+n FEE64s - chain terminated by 50 Ohm - currently disconnected from pulser

      All system wide checks OK *except* aida02 & aida03 WR decoder status errors - attachment 10

      WR timestamps OK - attachment 11

      ADC data item stats - attachment 3
       12 of 16 < 20k, all < 100k

      per FEE64 Rate spectra - attachment 4

      per n+n FEE64 1.8.L spectra - attachment 5

      1.8.W spectra - 20us FSR - attachments 6-9
       preamplifier output noise generally very good

*Current ground configuration*

CAEN N1419ET LK fitted (non floating outputs)

ground cable from aida04-aida12-aida02-aida09-aida01-aida05
HV#0 aida12-aida03-aida15

ground cable from aida08-aida16-aida06-aida10-aida14-aida13
HV#1 aida16-aida07-aida11

LK3 fitted aida03, aida07

LK1 fitted aida02, aida04, aid06, aida08

test - distributed by daisy chain to n+n FEE64s - chain terminated by 50 Ohm - currently connected to pulser

test + distributed by daisy chain to p+n FEE64s - chain terminated by 50 Ohm - currently disconnected from pulser

all DSSSD ribbon cable drain wires grounded to their resepctive AIDA adaptor PCBs

JB observed open circuit between AIDA Al snout and AIDA support frame ( as expected )

AIDA PSU cabling as reported https://elog.ph.ed.ac.uk/DESPEC/560

Snout configuration:

- all bPlast cables are disconnected and floating. 
- CC taped up all the cables and exit points in snout.
- CC, JB covered the exit of the snout with two additional layers of aluminium foil which were also taped shut.


To Do:

- repower detector, see if similar conditions persist.
- disconnect test - pulser, again see if conditions persist.

- aida04 asic#1 investigate noise
- aida14 asic #1 & asic #2 u/s? replace ASIC mezzanine?




       

DRG quotes ( from Elog ) S505 FEE64 configuration as

"Configuration: Single/Narrow - 8 FEEs, 2 DSSDs

DSSD 1:
 X 0-63    =  3 (HV -ve)
 X 64-127  =  1
 Y 0-63    =  4 (HV 0v) 
 Y 64-127  =  2 
DSSD 2:
 X 0-63    =  7 (HV -ve)
 X 64-127  =  5
 Y 0-63    =  8 (HV 0v)
 Y 64-127  =  6 


Scalers:
1 - Pulser
2 - n/c
3 - Time Machine Original
4 - Time Machine Delayed
5 - n/c
6 - n/c
7 - SC41 L
8 - SC41 R"

LEC (20MeV FSR) spectra

attachment 1 m_p versus m_n DSSSD#1 & DSSSD#2
attachment 2 E_p versus E_n DSSSD#1 & DSSSD#2

HEC (20GeV FSR) spectra

attachment 3 m_p versus m_n DSSSD#1 & DSSSD#2
attachment 4 E_p versus E_n DSSSD#1 & DSSSD#2

attachment variables.dat ( ADC offsets, e_diff windows & FEE64 onfiguration ) NAMELIST I/O format

In the morning we reinstalled FEE64s aida06, aida13, aida07. The rails of the FEE64 boards were found to be incorrect (that of the rails that were used in CARME).

After replacing the rails on the abovementioned FEE64s we powercycled AIDA and found the following results in the histograms and statistics.

As can be seen in attachement 4, aida16 has a noisy waveform and we are going to investigate this further.

When setting the threshold to 0x64 (1 MeV) on the slow comparator threshold we saw that the low energy branch of aida04 was still noisy. (Attachment 6)

- Setting the slow comparator threshold to 0x32 (0.5 MeV) introduced noise into aida08, aida16 and substantially more noise in aida04. (Attachment 7)

- Setting the slow comparator threshold to 0x14 (0.2 MeV) introduced noise into aida11 and substantially more noise in aida04, aida08, aida16 and aida06. (Attachment 8)

- Setting the slow comparator threshold to 0xf (0.15 MeV) introduced more noise into the same aforementioned channels aida04, aida06, aida08, aida11, aida16 (additionally aida02), barring hot strips. (Attachment 9)

We covered the end of the snout with a black cloth and this reduced the noise in some of the channels (Attachment 10 and 11).

- We covered the end of the snout with two layers of aluminium foil - this produced the same result as covering the snout with the black cloth (Attachment 12, 13, 14 & 15).

We resumed after lunch.

- Replaced the aida16 adaptor PCB with a spare, and this produced a much more sensible rate and hitpattern in aida16, which could lead us to believe that the aida adapter card was faulty or misaligned. (Attachment 16, 17, 18 & 19).

- Placed two LK1 back on the n+n side of both DSSSDs on aida06 and aida02. The noise and rate did not change at all. (Attachment 20 & 21)

Pulser tests:

- The test + pulser was connected to the p+n sides (top and bottom) at 25 Hz.

- After checking the ASIC control 2 times over, the pulser seems to be ok for all p+n channels excluding aida01, aida13 and aida14. (Attachment 23)

- The pulser peak width of aida09 1.8.L was found to be c. 55 channels FWHM on uncalibrated scale which corresponds to 35 - 40 keV FWHM in energy resolution. (Attachment 24)

- After reseating the adaptor board PCBs we found the same result as before reseating the adaptor boards (Attachment 25).

- Connecting the test - pulser to the n+n  side we found that most of the ASICs behaved normally which ASIC 1 in aida04 was showing abnormal behaviour. (Attachment 26, 28). The test + pulser loop is still in place.

-  The pulser peak width of aida02 1.8.L was found to be c. 118 channels FWHM on uncalibrated scale which corresponds to 95 - 100 keV FWHM in energy resolution. (Attachment 27)

- We set the thresholds on the n+n side to 0xf and the p+n side to 0xa. Subsequently, we observed improved noise conditions in many of the channels. The still noisy channels are aida01, aida04, aida08. (Attachment 29, 30). This might be because we have introduced an addtional ground loop with the pusler tests, but could also mean that the ground loop that is currently being used is not sufficient or poorly implemented.

Summary:

- From the pulser test it is clear that aida14 ASICs 1&2 are not in good shape and appear to be faulty. 

- We managed to improve from 1 aida module in the sub 20 kHz rate range to 6 aida modules in the sub 20 kHz rate range by the end of the tests.

- We set the slow comparator thresholds on the n+n side to 0xf and the p+n side to 0xa. Subsequently, we observed improved noise conditions in many of the channels. The still noisy channels are aida01, aida04, aida08. (Attachment 29, 30). This might be because we have introduced an additional ground loop with the pusler tests, but could also mean that the ground loop that is currently being used is not sufficient or poorly implemented.

19.10 CAEN N1419ET LK fitted
      power cycle

attachments 1-6

FEE64 configuration per https://elog.gsi.de/despec/S100/6

Configuration: Wide - 16 FEEs, 2 DSSD

DSSD 1:
 X 0-63    =  15 
 X 63-127  =  9
 X 128-191 =  3 
 X 192-255 =  1
 X 256-319 =  12 
 X 320-385 =  5
 Y 0-63    =  4 
 Y 63-127  =  2 


DSSD 2:
 X 0-63    =  11 
 X 63-127  =  10
 X 128-191 =  7
 X 192-255 =  14
 X 256-319 =  16 
 X 320-385 =  13
 Y 0-63    =  8
 Y 63-127  =  6 

Scalers:
1 - Pulser
2 - FRS Accepted
3 - Time Machine Undelayed
4 - Time Machine Delayed
5 - SC41 L
6 - SC41 R


Thresholds (Slow / Fast / Implant)
DSSD 1 p+n : 0xA (100 keV) / 0xFF (disabled) / 0x02 (200 MeV)
DSSD 1 n+n : 0xF (150 keV) / 0xFF (disabled) / 0x02 (200 MeV)