0:04    Biases and leak currents shown as attachment #1, 12JunBias1.png
        System-wide checks: nnaida13 fails ADC calib, all others okay
        Temperatures shown as attachment #2, 12JunTemp1.png
        Implants are 20 to 40 cps, mostly in SSD2 and SSD6 see attachment #3 12JunImplant1.png
        Statistics shown attachment #4, 12JunStats1.png
        Analysis shown as R9_175.txt attachment #5
        

00:17   No implants in AIDA nor proper evt. numbers in BRIKEN R9_177, expect beam is down
        Operators call, RF dropped of IRC

00:23   Problem of another RF.

00:24   Beam is back R9_179 for AIDA

00:36   AIDA R9_182 at run close.

00:39   AIDA R9_183, BRIKEN 141, run BigRIPS 4031

00:50   We stop the beam to adjust degraders in F11.  AIDA R9_186
        BRIKEN and BigRIPS runs stopped

00:54   Removed 1.0 mm Al, added 0.5 mm (net is subtracting 0.5 mm Al)
        R9_187 AIDA run, BRIKEN #142, BigRIPS #4032

01:34   AIDA R9_198 at changeover

01:35   Same AIDA run R9_198, BRIKEN #143, BigRIPS #4033
        System wide checks okay (except ADC calib on nnaida13)

02:34   R9_214 at changeover.  

2:36    R9_215 with new runs BRIKEN 144 and BigRIPS 4034.
        More implants are now seen in SSD3 rather than SSD2.  Zeroed MIDAS histos, so updated later with stats.
        Biases as attachment #6, 12JunBiases2.png

02:45  Beam stopped R9_217.  Beam stripper has a problem.

02:48  Beam is back, R9_220

03:12  R9_224 operators call, beam is stopped from stripper foil issue

03:18  Beam is back, AIDA run R9_226

03:34  R9_230 at changeover
       System wide checks all okay, except nnaida13 ADC calib as above.

03:35  The end of R9_230 corresponds with BRIKEN 145 and BigRIPS 4034.

03:51  Operators call, beam looks stopped.  R9_235 at AIDA.  Change stripper foil

03:57  R9_236 when beam returns.

04:35  We noticed beam is gone.  R9_246 for AIDA.  

04:36  Beam comes back.  R9_247 BRIKEN 146 and BigRIPS 4035
       Attachment #7 12JunImplant2.png shows implantation profile, confirming SSD 3 is the main one with new
degrader setting
       Statistics shown as attachment #8, 12JunStats2.png
       Analysis shown as attachment #9, R9_244.txt
         No ts timewarps, no MBS timewarps, deadtime on nnaida13,21 nearly 1%, most others small.

05:20  Noticed /data10 only has ~250 GB left, so we should do something to resolve it.
       First thing is, not much compression is done recently.  So I begin to compress /TapeData/RIBF128/R7* with
nice 10
       However, compression at this rate will take much too long so it looks like something should be removed.
       Confirmed that RIBF127R1 data file names and sizes are the same between /TapeData and the new external HDD
at /ntfs

05:33  AIDA R9_262, BRIKEN 147, BigRIPS 4036

06:34  AIDA R9_279 at run change

06:36  BRIKEN run 148, BigRIPS 4037
       System-wide checks passed, except nnaida13 ADC calib still fails.

06:54  R9_284 beam is stopped.

6:59   Beam is back.

07:33  R9_295 at start of BRIKEN 149, BigRIPS 4037

07:36  No syncs are seen at BRIKEN (but they were seen at the start of other runs)
       Implant profiles shown as Attachment #10, 12JunImplants3.png
       Several resets or new runs on BRIKEN / BigRIPS are done to troubleshoot

07:48  AIDA passes all system checks (besides the nnaida13 ADC calib)
       It seems (part of) the issue is triggers from BigRIPS.

08:04  BigRIPS scalers show events are presented, but no triggers are accepted.
       Some part of the DAQ is vetoing the events basically.

08:11  Baba san came on shift.  Issue was ccnet03 crashed.  We reset the Camac crate and reinitialized, DAQ comes back
       AIDA R9_306, BRIKEN #152, BigRIPS # 4041

Shift change

16:00 
      115 pnA primary, 290 cps implants at F11
      Presently at AIDA R2_616
      DAQ is running smoothly - passes all system checks (except ADC calib of nnaida7)
      Stats okay, though nnaida19 and 24 running a bit high (seems consistent w/ previous shift) - attach 1
           (Consistent with lower thresholds, pasted below)

      100Sn setting, 0.3mm Al degrader

      ASIC settings 2019Jun13-08.56.35
      DSSSD#1 slow comparator 0xa -> 0x1d
      DSSSD#2 slow comparator 0xa -> 0x8
      DSSSD#3 slow comparator 0x8 -> 0xa

      Biases fine - attach 2
      Merger okay - attach 3
      TapeServer okay - attach 4

16:13 New DTAS run 105
      AIDA R2_618
      BigRIPS is still 2044 as at 15:03

      Temperatures okay - attach 5

16:20 Implant spectra look good, mainly into DSSSD2 - attach 6

      Spectra saved in ~spectra/specs-2019Jun18-16.24.33

16:30 Zero stats, histograms

17:03 Old runs ending
      AIDA R2_626
      In principle DTAS 106 but it switches quickly to 107
      BigRIPS 2045

17:10 New run DTAS 108, AIDA R2_627

18:09 New implant profile - attach 6
      New stats - attach 7
      Looks okay

19:08 AIDA R2_647, DTAS 110

19:14 AIDA R2_648, DTAS 111, BigRIPS 2046

20:08 XY implants - attach 8
      Bias - attach 9
      Merger - attach 10
      TapeServer - attach 11
      Stats - attach 12

21:15 New runs: BigRIPS 2047, DTAS 115, AIDA R2_668

22:37 XY - attached 13; stats - attached 14
      Primary beam at 120 pnA; implants around 250 cps at F11

23:14 DTAS closes the run

23:20 New runs: AIDA R2_688, DTAS 118, BigRIPS 2048

06/02/15

 A look at the data rate at which Pause/Resumes start to cause missing data.

Pulser settings:

• 100 Hz
• 0.5V amplitude

Slow comparitor thresholds were altered using the ASIC4 page to artificially increase the data rate in the ASICs.

Default settings for all modules, apart from the changing slow comp threshold.

nnaida13+14 both functioning well. nnaida11+12 both have one noisy channel contributing to high data rate.

Echoing Alfredo's previous post, using the AIDA Good Events and AIDA Data Rate from the stats page as metrics, I found there to be no Pause/Resume items present in the data up to a Good Events rate of ~250-300 kHz and Data Rate of ~1-1.2 MHz.

Around this point the data shifts very quickly from containing no Pause/Resume items to having a rate of ~18 Hz, almost as a step function. At this point the Good Events and AIDA data rate sharply reach a maximum rate of 300 kHz and 1.2 MHz respectively. The rate of AIDA SYNC data items drops sharply at this point and decreases slowly with decreasing threshold.

Included are some plots showing this for each of the modules and some summary plots.

Further to the data rate at which the appearance of Pause/Resume items causes significant data loss, I looked at what happens when you break this threshold and then come back down, i.e. do the Pause/Resume items persist?

In short, no. Starting from a threshold of 64 and working down to 1, then taking the slow comparitor threshold back to a level at which no Pause/Resumes were present, the Good Events, AIDA SYNC and AIDA Data rates all went back to their original values within a couple of refreshes of the stats screen (and stayed as such thereafter).

Kept largely the same settings at the entry https://elog.ph.ed.ac.uk/AIDA/4

Same ASIC settings

Emco used to provide HV

HV+ --> nnaida11 & nnaida12 (p+n strips, -ve pulser input)

HV- --> nnaida13 & nnaida14 (n+n strips, +ve pulser input)

Stat spectra look roughly the same as those included in the above entry.

 A late entry for the work I carried out on Thursday.

With the Emco box providing the HV, the pulser peak showed double (or triple) peaks. This was not seen with the SY1527 so I thought this would be better for looking at peak widths.

Same ASIC settings my previous entry, and a HV of 200V with leakage current 3.8uA.

I varied the shaping time in each module using the ASIC4 control page as this also changes the hold time automatically. Slow comparitor threshold of 64.

Checked each module and took sample channels from a couple of ASICs in each but made qualitative comparisons with random channels in all ASICs to make sure the chosen ones were representative of the ASIC/module as a whole.

Tables and graphs are included below for nnaida11 and 13. nnaida13 showed a high level of low E noise on some spectra, but the pulser peaks were always well defined single peaks.

nnaida12 showed noises across the full range of many spectra in all ASICs apart from ASIC4. Patrick suggested this module may possibly be suffering and need replacing. A quick scan through some channels showed:

• average peak width @ shaoing time of 0.5us of ~150-180 ch
• same at shaping times of 2.5 and 4.5us. Noise present over full range throughout

My taxi was arriving so I didn't have chance to go through nnaida14 in depth, but a quick scan showed peak widths within ~10-15ch of those seen in nnaida13.

Tests with the HV supply (CAEN N1419ET) and Pulse Generator ( BNC PB-5 ) in the detector lab on the crate behind the DEGAS detectors, carried out the 9th August 2023

Both modules were plugged

Test 1: pulse generetor on 2 Hz

- DC, 50 ohm - HV OFF - attachment 1

- DC, 50 ohm - HV OFF, Zoom on the noise - attachment 2

- DC, 50 ohm - HV 50 V, Zoom on the noise - attachment 3

Test 2: HV supply Channel 1 - CORE and 2 - BRAID, pulse generator still on

- AC 1 Mohm - HV OFF - attachment 4

- AC 1 Mohm - HV 50 V - attachment 5

No differences were observed between crate OFF, HV OFF and HV 50 V. An important periodic noise (green on the pictures) was observed and was significantly smaller when unpluging the HV module from the crate. The thickness of the baseline noise seems to be comparable to entry 882, attachment 33-35.

MSL type BB18 serial # 2977-20 bias +100V I_L +12.0uA T=23 deg C
(biased by nnaida # 3 & 5 )

DSSSD - AIDA adaptor PCB cabling
 
4 off LH Coupler (Kapton PCB, 5cm), 2x 34-way Samtec ribbon cable (62cm p+n, 53cm n+n),
RH coupler(Kapton PCB, 10cm)
 + 3M 1245 1.4mil copper foil screen ribbon cables (i.e. not RH & LH couplers)
 + drain wires -> gold-plated Lemo-00 test input connectors

to FEE64s in 4x FEE module crates

Snout drain wire to FEE module Cu block

nnaida 3 & 8 AIDA adaptor PCB rev C
nnaida 5 & 9 AIDA adaptor PCB rev C (LK1 fitted) 
ground links LK3 & LK7 fitted to nnaida3, 5, 8, & 9 AIDA adaptor PCBs

*** Note added 11.58 sat 30 Apr 2016
Detector bias cable to nnaida3 & 5 adaptor PCBs *but* LK1 fitted to nnaida9 *not* nnaida5.
This has been set this way since start of current series of tests Wed 27 April. Connecting
via a different adaptor PCB to that connected to the CAEN N1419 bias supply causes significant
noise issues presumably due to high resistance path via 2x adaptor PCB to DSSSD cables
and the DSSSD bias bus line on the DSSSD.

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 3 & 8 - negative input
 nnaida 5 & 9 - positive input
 
Pulser BNC PB-4 
Fall time 1.0ms
Rate c.100Hz
Delay min
Amplitude 50,000
Polarity -
Pulse top Tail
Atten 10x
+ polarity via EG&G Ortec 433A Sum & Invert Amplifier

Pulser peak widths broad, structured, non gaussian c. 200ch FWHM

attachments 1-4 ASIC # 1 waveforms for each acqserver with all acqservers connected to same PSU

attachments 5-6 for comparison, from yesterday, with acqservers from two different PSUs - note
absence of HF noise in attachments 1-4 cf. attachments 5-6. 

MSL type BB18 serial # 2977-20 bias +100V I_L +12.45uA T=23 deg C
(biased by nnaida # 3 & 5 )

DSSSD - AIDA adaptor PCB cabling
 
4 off LH Coupler (Kapton PCB, 5cm), 2x 34-way Samtec ribbon cable (62cm p+n, 53cm n+n),
RH coupler(Kapton PCB, 10cm)
 + 3M 1245 1.4mil copper foil screen ribbon cables (i.e. not RH & LH couplers)
 + drain wires -> gold-plated Lemo-00 test input connectors

to FEE64s in 4x FEE module crates

3M 1245-wrapped cables enclosed by polyethyelene bags (supplied to deliver 90cm Printech Kapton PCBs)
to ensure no electrical contact with snout, DSSSD mounting tubes, snout base etc

Snout drain wire to FEE module Cu block

nnaida 3 & 8 AIDA adaptor PCB rev C
nnaida 5 & 9 AIDA adaptor PCB rev C (LK1 fitted) 
ground links LK3 & LK7 *not* fitted to nnaida3, 5, 8, & 9 AIDA adaptor PCBs
LK1 fitted to nnaida5 ( cf. https://elog.ph.ed.ac.uk/AIDA/190 )

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 3 & 8 - negative input
 nnaida 5 & 9 - positive input
 
Pulser BNC PB-4 
Fall time 1.0ms
Rate c.100Hz
Delay min
Amplitude 50,000
Polarity -
Pulse top Tail
Atten 10x
+ polarity via EG&G Ortec 433A Sum & Invert Amplifier

Standard ASIC settings

Shaping time 8us
LEC/MEC Slow com 32 (dec)
        Fast com 32 (dec)
HEC Fast com 2(dec)

Attachments 1-4 ASIC #1 waveforms from each FEE64
            5-8 ASIC #2 spectra + 2.0.L pulser peak width 

Pulser peak widths (ch FWHM) versus shaping time ( spectrum 2.4.L )

tau nnaida3 nnaida5 nnaida8 nnaida9
 8   68      60      70      62
 4   83      49      88      48
 2  100      47     109      43
 1  172      60     165      42
0.5 380      86     309      48  

Note: n+n ohmic strips spectra > 100 ch FWHM display non-gaussian peaks/double peaking 

15.45 Attempted to increase detector bias from +100V to +150V
      Leakage current increased ~0.5uA/V for bias > 115V
      Detector bias supply trips (20uA) at +120V
      Remain at detector bias +100V

16.17 Switch polarity of detector bias from + to -
      Move LK1 from nnaida5 to nnaida3

tau nnaida3 nnaida5 nnaida8 nnaida9
 8   61      64      65      61

n+n ohmic strips ~10% improvement, p+n junction strips no significant change

16.30 Fit LK3/LK7 jumpers to connect adaptor PCB ground to detector PCB ground
 
tau nnaida3 nnaida5 nnaida8 nnaida9
 8   61      64      62      60

No significant change to cf. previous test

18.30 Install second DSSSD

Upstream   3058-6  bias +100V I_L 4.15uA
Downstream 2977-20 bias +100V I_L 11.8uA
+ 207Bi source ~3cm upstream of 3058-6

Standard ASIC settings
shaping time 6us
slow comp 8(dec)
HEC fast comp 2(dec)
LEC/MEC fast comp 16(dec)

Pulser peak widths ~60 ch FWHM per previous tests today

Discriminator masks TBD

22.27 R2 to disk (directory /data20/TapeData/May2016)
      MERGE data links 2-9

Run data to disk overnight. Add two more DSSSDs tomorrow.

09.21 R2 stopped

UPSTREAM


Detector  Serial  Operating  CAEN N1519  CAEN N1519  Bias    FEE64                  Bias Config   
#         #       Bias (V)   Addr #      channel #   Cable                          Core      Braid

1         3058-2   +100       0           0          1       nnaida25, 27, 30 & 32  nnaida27  nnaida29 (LK5)
2         3058-3   +100       0           1          2       nnaida18, 20, 22 & 23  nnaida20  nnaida22 (LK1)
3         3058-4   +100       0           2          3       nnaida17, 19, 21 & 24  nnaida19  nnaida21 (LK5)
4         3058-5   +100       0           3          4       nnaida10, 12, 14 & 15  nnaida12  nnaida14 (LK1)
5         3058-6   +100       1           0          5       nnaida9, 11, 13 & 16   nnaida11  nnaida13 (LK5)
6         3058-7   +100       1           1          6       nnaida2, 4, 6 & 7      nnaida4   nnaida6 (LK1)
7         2977-15  +100       1           2          7       nnaida1, 3, 5 & 8      nnaida3   nnaida5 (LK5)
8                             1           3          8


DOWNSTREAM

Notes
_____

MSL type BB18 PCB ground links (LK3 & LK7) not fitted

To be checked

Detector configuration - see https://elog.ph.ed.ac.uk/AIDA/193

Ribbon cable to nnaida19 FEE adaptor PCB disconnected due to noise issues
associated with nnaida19 or crate slot or power/timestamp/network cabling
to nnaida19 - to be investigated May 22-

207Bi source ~3cm upstream of DSSSD #1

rate and hit rate spectra for all FEE64s - see attachments 1-4

example ADC spectra for all FEE64s - attachment 5 p+n strips, attachment 6 n+n strips

Default ASIC settings, shaping time 8us (which may, or may not, be optimum - to be 
investigated May 22- )

      p+n junction strips       n+n ohmic strips
FEE64 Pulser peak width   FEE64 Pulser peak width
      (ch FWHM)                 (ch FWHM)
1     108                 3      88
2      64                 4      84
5     112                 7      76
6       -                 8      85
9      75                 11    122
10     82                 12     98
13     84                 15    127
14     99                 16    115
17     77                 19      ?
18     69                 20    100
21     77                 23     89
22     91                 24     84
25     80                 27    138
26     14                 28     16   } not connected to DSSSD
29     17                 31     17   }
30     130                32    111

DSSSD bias voltages and leakage currents - attachments 7-8
All bias voltages +100V cf. depletion ~70V for 3058 sequence (MSL type BB18)
Additional bias may be helpful (to be investigated May 22-)

 The MACB system of clock and SYNC pulse distribution does have to follow some rules. 

The Master needs to be in a very particular place. The rest are less important as long as they are all at the same level in the tree.

In the tree you report above and using the numbering you report. The Master should be in MACB3:out1. 

The settings you have shown are correct if the Master is placed correctly ...

I will input a separate Elog entry detailing the settings for the MACB and the rules for the tree.

Regarding nnaida7+8. I agree the issue to tackle first is the cooling plate contact to the module. Where do they feature in the layout ?

Is the plate tightened up correctly ?

Regarding the P side FEE64s ... sorry about this ... but is the P pulser working ... well i did  have to ask ;-)

 Regarding the P side problem.

What is the result if you change one of the N-Side FEEs to use the P-side pulser and vice-versa ?

Regarding the temperature problem.

Which position are the problem modules in ? 

 To power down the ADCs the register to be loaded with 0xFF is in the "Local Registers" window. 

What you did was to disable the readout of the ADCs which doesn't change the level of activity or reduce the power.

Powered system on and biased to +200V at room temp of 22.4oC. Leakage current of 3.37uA.

Waveforms very noisy and spectra dominated by low E noise. Upon taking a close look at front end found one of the kaptons to have broken a connection. Swapped it out for a spare.

Returned to same situation as last week. Peaks all have a shoulder at t_shape of 8us, but main peak has width ~80ch. Shorter shaping times lead to double peaking.

Removed FEEs from crate and properly seated adapter PCBs on Cu mounting block, with washers between plated part of PCB and allen screw.

           - <0.4 ohm impedance betwee Cu mount block and washer/screw but ~20 ohms between screw and LEMO connector => 20 ohms between Cu mounting block and LEMO connectors

           - plating around screw holes doesn't go anywhere.

Confirmed LEMOs are connected to ASIC ground (as they should be) on the Cu mezzanine block with <0.2 ohm impedance between mezzanine Cu and LEMO connectors.

With adapter PCBs removed, Cu mezzanine blocks of separate modules still have impedance < 0.3 ohm between them. How/why?

            - found out MACB cables, power cables and network cables all connect the grounds of each FEE card/module. Was this expected? Does this cause us problems?

Swapped non-functioning nnaida12 for the former nnaida11 from the module featuring the other broken nnaida12 - all seems to work, although no waveforms are produced.

Very low impedance between ASIC grounds of FEE cards in same module.

To obtain a better ground connection between the ASIC grounds of separate modules, connected a thick braid to Cu mezzanine block of each. Operating at limit of multimeter so no noticeable difference in impedance. But...

With mezzanines connected and thick braid connecting HV and pulser at LEMO connectors, see the best waveforms so far; very little noise, some transients (attachments 1+2).

However, in nnaida14 waveform does not get back to baseline properly after a pulser event (attachments 2+3).

Despite very clean waveforms, still see double-peaking in spectra, although peak widths are fairly low (attachment 6).

 The case has been changed for one that doesn't allow the power cable to be easily extracted.

10.55 DAQ found to have stopped at 06:47 during LN fill cycle.

10:57 Screen shots of system after stop

11.20 R122 started.
      System check screen shots attached at 11:08

18.20 System been running stably all day. Leakage currents attachments 14+15.
      LN2 fill cycle shortly, anticipate DAQ stop.

19.16 DAQ stopped.
      Closed file R122.

19.37 Temp 25.3 DP 6.1 Hum 31.1
      Added 2 extra stacks of lead bricks to protect AIDA. Now ~15cm of lead (Attachment 17)

23.30 DSSSD bias & leakage currents OK - see attachments 18-19
      FEE74 temperatures OK - see attachment 20

23.54 DAQ starts (R124)
      Merge rate 1.8M items/s, c. 13Mb/s to disk c. x2 earlier rates
      Dominated by significantly higher rates from DSSSD#1 
      FEE64 #17 ASIC 2*L pulser peak widths ~300 ch FWHM 
      Needs to be investigated at next entry opportunity

00.15 Setting changed to 71,72,73Ni. All variable degraders in.
      Will remove while watching rates to settle on degrader setting.
      F5 CH2 in. F7 CH2 out. F11 C target in.
      F11 plastic rate 1.2kHz.
      R5 started.
      
00.30 Cut F2 momentum slit. F11 plastic rate down to ~400cps.

00.34 Increased primary beam intensity by x2.
      F11 plastic rate increased to ~800cps.
      This setting should run until the beam change ~03.00.
      
00.47 R6 started.
      All degraders gradually removed but implant rate in DSSD1 only ~10s Hz.

01.03 71,72,73Ni beam stopped for tuning to next setting.
      R6 stopped.
      Leakage currents attachments 1+2

(4 mm Al mask was put upstream of AIDA near 20:20 on 7 June)

01.15 Run R1219 started on neutron rich setting.

            Temps ok. Leakage currents ok.

             Plate with holes in front of AIDA , after F11 plastic. F11 plastic count rate ~700cps.

             Keeps getting 'Attempting resychronisation' message in merger terminal window.

             driver 0 10205 consuming almost 100% of CPU. Merger ~20% and data links ~1%

              See attachments 1-4

02.15 Run R1220 n-rich setting (BigRIPS run 1218, EURICA off)

          EURICA team retires for the night and cannot get it up and running

          Biases and leak shown as attachments 5-6

          Merger info is shown in attachments 7-9

          CPU Load in attachment 10

          Timestamps against the ADCs and also SYNCS, respectively, attachments 11 and 12

          3:31: Run stopped for the operator to tune the beam

          F11 plastic rate was 700 cps (~heavy ion injection rate)

3:43 Run R1221 n-rich setting (BigRIPS 1219, no EURICA)

          4 mm Al mask was removed.

          Pause calls vs. Timestamp is attachment 13

          Merger screenshots are shown as attachments 14-16

          F11 plastic rate is 850 or 900 cps after retune

          ADC v Timestamp is shown as attachment 17.  It can be seen the rate was roughly constant before the operators stopped (corresponding to a long gap of no hits, but now  we go up and down quite a lot in a rather ugly way

          CPU stats (driver to write to HDD in green, merger in red) as attachment 18

          At the time of ~90 in attachment 18, the linkers start to consume all available CPU resources, shown as attachment 19

04:35 Run R1222 n-rich setting (BigRIPS 1219 / 1220)

          Ask the operators to reduce the beam intensity by "1/2" -> F11 plastic rate goes from 850 cps to 170 cps, so more like 1/4 effectively

          Merger stats are shown as attachments 20, 21, 22. 

          nnaida1 and nnaida24 seemed to often show pauses (among other ones)

          trying to understand what's going on with the display in Midas, because it has looped around to time zero and is putting new data on to the old data...?

         It seems this condition is much better than before, though

         05:33 stop the run

05:38 R R1223 n-rich setting (BigRIPS 1221)

           Ask the operators to resume the previous beam intensity.  (Now like 600 to 800 cps at the F11 plastic)

           attachment 23 shows the beam coming on near time zero.  within <100 seconds, the driver has to fight with many link64 instances and cannot operate correctly

           we understood how to clear the midas histograms so that we can make sense of things.  attachment 24 is ADC, and attachment 25 is pause. 

           you can see some data come smoothly until the system locks down

06.11 R1223 stopped.

06.30 Started run R1224.

            Moved Pb bricks downstream of F11 plastic inwards, from a separation of 15cm, to 4cm in an effort to reduce rate in AIDA.

            F11 plastic rate ~900cps.

            No change to vis scalar rates and data still being dropped.

06.45 Stopped run R1224.

            MIDAS plot of ADC vs Timestamp (attachment 26) shows characteristic behaviour.

            Upon writing to disk, for the first minute or so link64 processes consume minimal CPU power. But then very quickly they ramp up consumption and ultimately choke the merger (it seems).

            This is reflected in the ADC v TS plot. Continuous ADC data for first ~1min.

06.54 Moved Pb bricks to separation of 2cm. Started run R1225.

            AIDA vis scalar rates reduced slightly, but no change to CPU usage and usual happens - data lost, link64 CPU usage spikes and chokes merger (seemingly).

            F11 plastic rate ~900cps.

07.00 Run R1225 stopped.

           SYNCs stopped being produced. Lost contact with nnaida1.

07.25 Pb bricks moved to 1cm apart. Run R1226 started.

            No change to CPU usage (link64 still hogging everything). MIDAS online monitor lost in power cycle so cant view in real-time, but anticipate same outcome.

            Sopped producing SYNCs 07.39. Run 1226 stopped.

08.20 Some trouble restarting DAQ and merger.

            As nnaida19 has lost the 'H' for histogramming on the run control page, nnaida21 has now lost the 'X' for data transfer (see attachment 27).

           Removed nnaida21 from merger and normal state of play resumed.

           4mm holey plate + the one attached to it we installed dowstream of F11 plastic.

08.50 Run R1227 started.

           CPU usage by link64 ~1% and driver ~70%, much more reasonable. When reloading merger web page, channels flash between bright green and olive. Good.

09.09 Changed to reference mass setting. Run R1227 stopped.

09.12 Run R1228 started on reference setting with holey plate still in place.

           R1228 stopped 10.32 (for B2F/F11 entry)