 Sun May 8 17:43:57 2022, NH, AIDA FEE64 Layout 
|
AIDA FEE64 layout with respect to the beam. |
|
Sun May 8 15:10:45 2022, TD, Sunday 8 May 6x
|
DSSSD bias and FEE64 power OFF during Ge install
Photographs of AIDA (triple) + DEGAS setup as of Sunday pm.
Attachments 1-4 side/front/oblique views - note AIDA snout droops and twists
Attachments 5 & 6 - position of the AIDA stand vertical adjustment threads (brass)
The asymmetry upstream-downstream pre-dates this setup. To lift the end of the snout clear of the of lower DEGAS detectors all 3x 1/4 turns clockwise (viewed from above) were applied to each of the four threads. |
|
Sat May 7 13:27:39 2022, TD, AIDA configuration
|
Adaptor PCB link settings
n+n FEE64s
aida02, 4, 6 & 8 - LK1 fitted, HV Lemo-00 not connected - left/right wafer n+n side bias ring -> gnd
p+n FEE64s
top - aida09, 1, 10 & aida13, 5, 14 - LK2 & LK4 fitted - front/back FP -> gnd
bottom - aida11, 3, 12 & aida15, 7, 16 - LK2 & LK4 fitted - front/back FP -> gnd
top - aida01, 5 - LK3 fitted - middle wafer n+n side bias ring -> gnd
bottom - aida03, 7 - LK3 fitted - DSSSD PCB gnd -> gnd
AIDA PSU
top 1-2, 3-4, 9-10, 11-12
bottom 5-6, 7-8, 13-14, 15-16
ASIC settings 2021Apr29-13-16-00
slow comparator 0x64 -> 0xa
BNC PB-5 settings
amplitude 1.000V
attenuation x1
tail pulse
tau_d 1ms
polarity +
frequency 25Hz |
|
Sat May 7 09:55:53 2022, TD, Saturday 7 May 15x
|
Attachments 1 & 2 per FEE64 1.8.L spectra
pulser peak widths aida01 121 ch FWHM, aida02 517 ch FWHM
Attachments 3 & 4 per FEE64 1.8.W spectra 20us FSR
Attachment 5 per FEE64 rate spectra
Attachment 6 - grafana DSSSD bias/leakage current for previous 7 days showing effect of day/night temp variations
Attachments 7 & 8 - merger & tape server c. 14Mb/s to disk - no errors reported by servers
Attachments 9-12 - system wide checks - all OK
Attachment 13 ADC data item stats
Attachment 14 FEE64 temps OK
Attachment 15 DSSSD bias & leakage currents OK
16.15 aida05 zero ADC data items stats
merger restart, DAQ STOP/Go cycle to recover
activity is S4 area near AIDA DSSSDs as install of DEGAS detectors commences
19.50 DEGAS install continues
DSSSD bias and FEE64 power OFF
|
|
Fri May 6 09:31:41 2022, TD NH, Friday 6 May 33x
|
10:30 DAQ appears to have stopped
Attachment 2 - DSSSD bias and leakage current OK
Attachments 1, 3-5 - zero rate adc data items all FEE64s - note aida08 adc data item counter zero
RESET/SETUP/GO aida08 *only*
DAQ STOP *all* FEE64s
Attachment 6 - FEE64 temperatures OK
Attachments 7-23 - system wide checks - all OK
10:48 DAQ GO *all* FEE64s
all spectra zero'd
attachment 29 - ADC data items
n+n FEE64s aida02, 4, 6 & 8 c. 250k
p+n FEE64s aida07, 9 & 12 c. 100-150k, all other FEE64s < 100k
attachments 26 & 27 1.8.L spectra
aida01 peak width 112ch FWHM
aida02 peak width 485 ch FWHM
attachments 24 & 25 1.8.W spectra 20us FSR
attachment 30 - aida05 1*H spectra - aida05 asic#1 is producing HEC data
attachment 31 - aida05 also producing disc data
attachments 32 & 33 merger and tape server OK - 14MB/s to disk - no data to MBS currently?
18.36 Disconnect ribbon cabling from adaptor PCB - continue to observe HEC events from aida05 asic#1
Disconnect test inputs from adaptor PCB - continue to observe HEC events from aida05 asic#1
Conclude aida05 asic#1 has probably failed in operation and should be replaced. Other FEE64s are currently in CRYRING hall and measurement is in progress - ML says we should be able to access Monday. |
|
Wed May 4 16:50:04 2022, NH, AIDA 4th May
|
bPlas has been mostly cabled in now
Reseat LAN cable (AIDA Switch -> AIDA-3) and reachieve 1 gbit/s speed as needed.
CHeck DAQ with MBS, working well (16 MB/s). Performance seems better than before on MBS side too
Note implant counts in aida05, observable in rate spectra (fig 1)
Also a few early channels in aida10 seem empty
ASIC check-loads didn't fix
Try powercycle... also didn't fix
Tomorrow will inspect adapter board and ribbon cable, perhaps it is loose.
Absolute rates otherwise seem OK (fig 2) aida01 and aida07 are both very hot.
aida01 is usually quieter but aida07 has always been observed running fast |
|
Mon May 2 13:08:49 2022, NH, AIDA Updates 2 May
|
The snout endcap has been sealed with new copper tape over the red tape
Observe significant drop in leakage current on DSSD #2 down to 7 uA (about 0.5 uA above DSSD #1) as it looked when the black cloth was on
It is possible more sealing needs to be done when bPlas is biased as bPlas is more sensitive
-
the AIDA LAN network interface is only running at 100 MBit/s - this will be problematic during the run
When 2A is free will try to reconnect cable to see if it returens to 1 Gbit/s
-
Preliminary alpha background analysis (over weekend, 90 hours statistics)
Cause of sporadic PAUSE/RESUME is not clear as rate is nearly always 0 outside of aida02/aida04
======================================
AIDA Unpacker Analysis
--------------------------------------
First event: Thu Apr 28 19:50:20 2022
Last event : Mon May 2 14:04:03 2022
Duration : 324823 seconds
--------------------------------------
MBS Events (M): 912899 (2 Hz)
AIDA Words (W): 7472078760 (-3441 Hz)
ADC Words (A): 2742871865 (-4778 Hz)
-- Decays (D): 2728717223 (-4821 Hz)
-- Implants (I): 14154642 (43 Hz)
Info Words (F): 4729206895 (1 kHz)
-- SYNC48 (S): 2093328 (6 Hz)
-- SYNC63 (s): 2093328 (6 Hz)
-- PAUSE (P): 3823161 (11 Hz)
-- RESUME (R): 3823161 (11 Hz)
-- Discrim (D): 1390520565 (4 kHz)
-- Scaler (C): 3326853352 (3 kHz)
-- Unknown (U): 0 (0 Hz)
Timewarps (T): 20 (0 Hz)
Dead Time (X): 5024.43 s (1.54682%)
======================================
======================================
Individual FEE Overview
======================================
FEE | W A D I F S s P R D C U T X
1 | 9593 6985 6628 357 2608 2 2 0 0 2604 0 0 0 0
2 | 31134221 31115668 31115166 502 18553 8183 8183 0 0 2187 0 0 0 0
3 | 717765720 17634 17218 416 717748086 216426 216426 0 0 1653 717313581 0 0 0
4 | 3467468322 2684820687 2684820157 530 782647635 1293089 1293089 0 0 62747129 717314328 0 20 0
5 | 177575 108631 107352 1279 68944 21 21 20 20 68862 0 0 0 0.00102142
6 | 8371118 8361524 8358540 2984 9594 1350 1350 23 23 6848 0 0 0 10.6775
7 | 1396478942 4860615 57719 4802896 1391618327 346048 346048 1286994 1286994 446838393 941513850 0 0 3071.3
8 | 954933629 3978543 3975110 3433 950955086 118195 118195 5 5 7093 950711593 0 0 5.47318
9 | 9877 7923 7429 494 1954 4 4 0 0 1946 0 0 0 0
10 | 8076 6236 5917 319 1840 4 4 0 0 1832 0 0 0 0
11 | 26792 24399 24029 370 2393 3 3 0 0 2387 0 0 0 0
12 | 18271 16025 15382 643 2246 6 6 0 0 2234 0 0 0 0
13 | 1094646 51444 48305 3139 1043202 195 195 1 1 1042810 0 0 0 0.179207
14 | 7314376 152823 84786 68037 7161553 906 906 18158 18158 7123425 0 0 0 32.882
15 | 438092 22117 20290 1827 415975 56 56 251 251 415361 0 0 0 4.91581
16 | 886829510 9320611 53195 9267416 877508899 108840 108840 2517709 2517709 872255801 0 0 0 4970.9 |
 Tue May 3 14:15:17 2022, NH, AIDA Updates 2 May
|
PAUSE/RESUME stats are dominated by 2x FEE64s - aida07 and aida16
These FEE64s also have the highest rates of discriminator data?
> The snout endcap has been sealed with new copper tape over the red tape
>
> Observe significant drop in leakage current on DSSD #2 down to 7 uA (about 0.5 uA above DSSD #1) as it looked when the black cloth was on
> It is possible more sealing needs to be done when bPlas is biased as bPlas is more sensitive
>
>
>
> -
>
> the AIDA LAN network interface is only running at 100 MBit/s - this will be problematic during the run
> When 2A is free will try to reconnect cable to see if it returens to 1 Gbit/s
>
> -
>
> Preliminary alpha background analysis (over weekend, 90 hours statistics)
>
> Cause of sporadic PAUSE/RESUME is not clear as rate is nearly always 0 outside of aida02/aida04
>
> ======================================
> AIDA Unpacker Analysis
> --------------------------------------
> First event: Thu Apr 28 19:50:20 2022
> Last event : Mon May 2 14:04:03 2022
> Duration : 324823 seconds
> --------------------------------------
> MBS Events (M): 912899 (2 Hz)
> AIDA Words (W): 7472078760 (-3441 Hz)
> ADC Words (A): 2742871865 (-4778 Hz)
> -- Decays (D): 2728717223 (-4821 Hz)
> -- Implants (I): 14154642 (43 Hz)
> Info Words (F): 4729206895 (1 kHz)
> -- SYNC48 (S): 2093328 (6 Hz)
> -- SYNC63 (s): 2093328 (6 Hz)
> -- PAUSE (P): 3823161 (11 Hz)
> -- RESUME (R): 3823161 (11 Hz)
> -- Discrim (D): 1390520565 (4 kHz)
> -- Scaler (C): 3326853352 (3 kHz)
> -- Unknown (U): 0 (0 Hz)
> Timewarps (T): 20 (0 Hz)
> Dead Time (X): 5024.43 s (1.54682%)
> ======================================
> ======================================
> Individual FEE Overview
> ======================================
> FEE | W A D I F S s P R D C U T X
> 1 | 9593 6985 6628 357 2608 2 2 0 0 2604 0 0 0 0
> 2 | 31134221 31115668 31115166 502 18553 8183 8183 0 0 2187 0 0 0 0
> 3 | 717765720 17634 17218 416 717748086 216426 216426 0 0 1653 717313581 0 0 0
> 4 | 3467468322 2684820687 2684820157 530 782647635 1293089 1293089 0 0 62747129 717314328 0 20 0
> 5 | 177575 108631 107352 1279 68944 21 21 20 20 68862 0 0 0 0.00102142
> 6 | 8371118 8361524 8358540 2984 9594 1350 1350 23 23 6848 0 0 0 10.6775
> 7 | 1396478942 4860615 57719 4802896 1391618327 346048 346048 1286994 1286994 446838393 941513850 0 0 3071.3
> 8 | 954933629 3978543 3975110 3433 950955086 118195 118195 5 5 7093 950711593 0 0 5.47318
> 9 | 9877 7923 7429 494 1954 4 4 0 0 1946 0 0 0 0
> 10 | 8076 6236 5917 319 1840 4 4 0 0 1832 0 0 0 0
> 11 | 26792 24399 24029 370 2393 3 3 0 0 2387 0 0 0 0
> 12 | 18271 16025 15382 643 2246 6 6 0 0 2234 0 0 0 0
> 13 | 1094646 51444 48305 3139 1043202 195 195 1 1 1042810 0 0 0 0.179207
> 14 | 7314376 152823 84786 68037 7161553 906 906 18158 18158 7123425 0 0 0 32.882
> 15 | 438092 22117 20290 1827 415975 56 56 251 251 415361 0 0 0 4.91581
> 16 | 886829510 9320611 53195 9267416 877508899 108840 108840 2517709 2517709 872255801 0 0 0 4970.9 |
|
Mon May 2 09:52:20 2022, OH, Shifter checklist 2022
|
Every 30 minutes:
- Reload statistics (Web browser tab screen 1, workspace 3)
- Are all FEEs still showing a rate?
- If one shows 0 after multiple reloads Call Oscar or Tom.
- IGNORE FOR TIME BEING Options database monitor (Top middle terminal screen 2, workspace 3)
- Has the message changed since the last check?
- If so copy the message and place in elog
- Do the ucesb scalers make sense? (Web browser, screen 2, workspace 5)
- If one DSSD is reporting kHz of implants when the others are much less it is likely an ASIC getting stuck.
- Perform and ASIC check (ASIC control tab, web browser, screen 1, workspace 3)
- Ensure "Act on all FEE" and "Act on all asic" selected
- Click on drop down menu in the bottom of the screen and select check ASIC control
- It will take a minute or so be patient (MIDAS can only respond to one command at once so don't try to do anything else)
- A pop up will appear check that all options say ok
- Has the implant rate gone to a more normal amount?
- If not feel free to call
Every two hours:
- Take a screenshot of the statistics page (Web browser tab screen 1, workspace 3)
- Compare to the previous screenshot to check if anything has drastically changed
- Take a screenshot of the temperatures (Web browser tab screen 1, workspace 3)
- Do they all appear stable?
- Take a screenshot of the bias and leakage currents - (Top left terminal, screen 2, workspace 3)
- Perform the five system wide checks (Web browser tab screen 1, workspace 3)
- Ignore the system wide checks for ADC calibration (ADCs are turned off so they will all fail)
- Check memory information also fails.
- Make a note in the elog of which tests are successful
- If failed copy the text from the white box into the elog and make a note of it
- Enter the screenshots into the elog
- Update the leakage current spreadsheet (Web browser, screen 2, workspace 5) |
|
Thu Apr 28 18:45:09 2022, NH, Alpha Background Run
|
Runs are in /TapeData/BGAPR22 located on 8TB disk "SecondDrive" (N.B. 2A experiment is using ThirdDrive)
Old runs and test files were removed from disk. Left is an unknown S481 folder (fibre implant test?) and Patrick
chown to npg:npg as uid changed from old SL6 to CentOS 7
Bias DSSDs, leakage current higher than before (maybe the sheet isn't covering the snout)
Pulser set to OFF
ASIC Thresholds 0x64, rates mostly 0 (good)
Edge strips on aida02 and aida06 show non zero, and lots in aida04 asic 1 are high, will recheck connector tomorrow in hope
Connecting to merger and rate is 60k items/sec with random jumps to 400k items/sec
Start xfer to tape server: Rate approx 100 KB/s (360 MB per hour, 2.88 GB per 8 hours)
19:51 - Will leave overnight running to collect alpha
Fri 29 Apr
14:38 - Run paused for MBS tests with FRS
16:50 - Resume alpha collection over weekend
Pulser OFF, 0x64 thresholds |
|
Wed Apr 27 15:47:46 2022, NH, HA, SA, CJ, AIDA 27 Apr 22 7x
|
Remount snout in S4 (photos to come)
Alignment with DEGAS OK but a bit short... DEGAS platform will be brought 31 mm closer to AIDA by rail adjustment
Can mount bPlas booster boards on old ITEM frames and also partly on AIDA snout (isolated)
-
Reconnect all adapter boards and grounds, bias AIDA...
HV OK. We still have a light leak at the snout endcap. "Fixed" with sheet for now
HV leakage currents figure 1
Start AIDA DAQ and check rates.. all seem OK. aida07 is very noisy other p+n good
Notice some issues in aida04, check and ribbon cable slightly loose on one side of adapter
No change to other FEEs.
Aida07 was inspected but nothing obviously wrong
Rates figure 2
Rate spectra figure 3
Wavesform figures 4 (p+n), 5 (n+n)
Pulser peak withs
p+n figure 6, width ~ 70 channels (50 keV)
n+n figure 7, width ~ 570 channels (400 keV)
n.b. double peak in aida14 is an artifact from an uncleared histogram
DSSDs debiased to allow work on bPlas cabling without tripping DSSDs |
|
Fri Apr 8 08:59:42 2022, OH, NH, Friday 8th April 11x
|
09:59 Noticed that the right hand ribbon cable for aida07 was offset vertically by 1. i.e. Only 1 of the 2 rows of pins in. Unbiassed detectors and reconnected.
Rebiassed detectors - leakage current on DSSD2 increased to 9.96uA - Attachment 1
Power cycling FEEs
Following restart the FEEs show some improvement in rates - attachment 2
Rate spectra - attachment 3
Still issues with aida11 in the rate spectra (Likely a misaligned ERNI connector)
Pulser on rate spectra - attachment 4
Pulser off rate spectra - attachment 5
We can see that with the pulser on there are events in the channels in aida01 and aida11
With the pulser off these channels disappear.
ERNI connector is then likely aligned the issue is more likely the DSSD ribbon cable is misaligned.
Taking bias off to investigate.
10:39 Could not observe anything out of alignement about either the connectors or the adaptor boards
Note that after pushing on the connector AIDA01 had largely recovered
13:30 Top of snout taken off while mounted in S4. It was observed that one of the ribbon cables for aida11 was off by 1 row.
This was corrected in situ and the snout was put back together and made light tight again.
Oddly leakage current still the same - DSSD2 has come down though - attachment 6
FEEs powercycled for new tests
Half the channels in aida11 had appeared again
Took apart once more and found the other header also off by one row which has been corrected
FEEs powercycled for new test
All of aida11 now showing - attachment 7
Statistics at 0xa shown in attachment 8
All p+n for DSSD1 are good (aida01, 03, 09, 10, 11 and 12)
p+n for DSSD2 are so so (aida05, 07, 13, 14, 15 and 16)
All n+n 2, 4, 6 and 8 are poor still
14:50 p+n waveforms - attachment 9
n+n waveforms - attachment 10
Current jumper configuration
LK1 (Bias ground) on FEEs 6 and 8
LK2&4 on all p+n
LK3 on aida03 and aida07 (Bottom middle)
15:00 Investigated whether there was a light leak. Placed black material over snout.
Leakage on DSSD2 dropped to 5.6 - attachment 11
There was a light leak
Stats have decreased slightly - attachment 12
16:00 Move raspberry pis atop 5mm alminimum plate to keep away from FEE64 PSUs
No change
16:30 Remove pulser network from all FEEs
Rates get noticably worse in many FEEs... why?
Stats - attachment 13
Possible ideas include braid touching things it shouldn't (Adapter PCBs?) |
|
Thu Apr 7 12:42:14 2022, OH, NH, TD, Thursday 7 April 8x
|
Re-assembled triple snout re-installed on the AIDA stand - DSSSD ribbon cables and grounds re-connected.
FEE64 adaptor PCB LKs per https://elog.ph.ed.ac.uk/DESPEC/409
Attachments 1 & 2 1.8.L spectra
p+n FEE64 aida10 pulser peak width 97 ch FWHM
n+n FEE64 aida04 pulser peak width 550 ch FWHM
Attachment 3 rate spectra
missing channels aida01, aida07 & aida11 - misaligned ERNI and/or Samtec connectors?
Attachments 4 & 5 1.8.W spectra
Attachment 6 ADC data item rates
aida10 OK, all others c. 300-400k
Attachment 7 FEE64 temperatures OK
Attachment 8 DSSSD bias & leakage currents OK |
|
Wed Apr 6 10:09:21 2022, OH, NH, TD, Wednesday 6 April 6x
|
DSSSD bias OFF. DAQ STOPped
Attachment 6 FEE64 temps OK
Attachment 1-5 system wide checks OK |
|
Tue Apr 5 12:46:52 2022, TD, MSL type BB18(DS)-1000 triple - cable lengths
|
OH/NH disassembling current AIDA triple snout and DSSSD stack.
Length of ribbon cables (including connector) outside snout as follows
p+n junction side 9cm & 15cm
n+n ohmic side 10.5cm & 16cm
Update
p+n junction side: 6.5cm, 10.5 cm (used 7.5, 11.5 for 1cm slack)
n+n ohmic side: 11.0 cm, 15.0 cm (used 12.0, 16.0 for 1cm slack)
Measurement from SAMTEC connector to exit from the rubber seals in AIDA snout. |
|
Tue Apr 5 08:52:16 2022, TD, Tuesday 5 April 6x
|
DSSSD bias OFF. DAQ STOPped
Attachment 1 FEE64 temps OK
Attachment 2 system wide checks OK *except* WR decoder (attachment 2) and FPGA ts errors no longer works
Attachment 6 System wide check - 'Synchronise ASIC clocks'
Attachment 5 System wide check - check ADC calibration - all 16x FEE64s fail
Attachment 4 System wide check - WR decoder status - aida09 WR status 0x10 clears
Repeat Synchronsie ASIC clocks
Attachment 3 System wide check - WR decoder status - aida05 WR status 0x10 clears
|
|
Mon Apr 4 09:19:49 2022, TD, Monday 4 April 12x
|
AIDA adaptor PCB config - all LKs removed *except*
aida04 & aida08 LK1
aida02 & aida07 LK2, LK3 & LK4
aida09, aida01, aida10, aida11, aida15, aida12 & aida16 LK2 & LK4
10.05 check all ASICs all FEE64s
zero histograms
Attachment 1 per FEE64 rate spectra
Attachment 2 per FEE64 p+n 1.8.L spectra - aida10 peak width 79 ch FWHM
Attachment 3 per FEE64 p+n 1.8.W spectra 20us FSR
Attachment 4 per FEE64 n+n 1.8.W spectra 20us FSR
Attachments 5-8 - system wide checks - all OK *except*
FPGA timestamp errors no longer works
aida05 & aida09 report WR decoder error 0x10
Attachment 9 ADC data item stats
Attachment 10 FEE64 temps OK
Attachment 11 DSSSD bias & leakage current OK
Attachment 12 per FEE64 n+n 1.8.L spectra - aida08 peak width 369 ch FWHM
14.25 DAQ STOP
DSSSD bias OFF
AIDA triple snout removed from AIDA stand and moved to table by aida-gsi (Messeheute) |
|
Sun Apr 3 10:56:11 2022, TD, Sunday 3 April 35x
|
all system wide checks OK *except* aida10 failed ADC calibration
Attachment 1 ADC data item stats
Attachment 2 FEE64 temps OK
Attachment 3 DSSSD bias & leakage currents OK
DSSSD bias to left (looking upstream) wafer *only*
FEE64s 10 & 12, 14 & 16
Attachments 4 & 5 1.8.W spectra 20us FSR
Attachment 6 ADC data item stats
Attachment 7 DSSSD bias & leakage current
ASIC check all FEE64s
DSSSD bias to middle (looking upstream) wafer *only*
FEE64s 1 & 3, 5 & 7
Attachments 8 & 9 1.8.W spectra 20us FSR
Attachment 10 ADC data item stats
Attachment 11 DSSSD bias & leakage current
ASIC check all FEE64s
DSSSD bias to right (looking upstream) wafer *only*
FEE64s 9 & 11, 13 & 15
Attachments 12 & 13 1.8.W spectra 20us FSR
Attachment 14 ADC data item stats
Attachment 15 DSSSD bias & leakage current
Conclusions
ADC data item stats -> 300-400k
n+n 1.8.W spectra show large signal excursions
p+n 1.8.W spectra for biased Si wafers OK - unbiased Si wafers show large signal excursions
DSSSD#1 leakage currents 1.850+2.220+1.990=6.06uA cf. 5.095uA with all 3 wafers biased
DSSSD#2 leakage currents 1.510+1.580+2.350=5.44uA cf. 5.235uA
Right wafer (looking upstream)
Bias(V) -20 -40 -60 -80 -100
DSSSD#1 I_L(uA) -1.135 -1.475 -1.645 -1.750 -1.805
DSSSD#2 I_l(uA) -1.625 -2.020 -2.205 -2.320 -2.360
Middle wafer (looking upstream)
Bias(V) -20 -40 -60 -80 -100
DSSSD#1 I_L(uA) -1.540 -1.870 -2.035 -2.150 -2.210
DSSSD#2 I_l(uA) -0.985 -1.285 -1.465 -1.575 -1.615
Left wafer (looking upstream)
Bias(V) -20 -40 -60 -80 -100
DSSSD#1 I_L(uA) -0.735 -0.915 -1.005 -1.080 -1.110
DSSSD#2 I_l(uA) -0.865 -1.205 -1.400 -1.510 -1.560
Bias versus leakage cuurent characteristic of each wafer of each DSSSD indicates diode behaviour.
Note LK1 not fitted - presumably LK3 of mid/top p+n FEE64 adaptor PCBs (aida01 and aida05) connecting n+n bias to gnd is sufficient to establish circuit.
15.50 Re-connect bias to all 3x Si wafers p+n junction side bias rings
ASIC check all FEE64s
Attachments 16 & 17 1.8.W spectra 20us FSR
Attachment 18 ADC data item stats
Attachment 19 DSSSD bias & leakage current
Conclusion - status quo ante restored
16.40 Remove aida01 & aida05 LK3, add aida04 & aida08 LK1
ASIC check all FEE64s
Attachments 20 & 21 1.8.W spectra 20us FSR
Attachment 22 ADC data item stats
Attachment 23 DSSSD bias & leakage current
Conclusion - no change
17.00 Add Thorn-Lab HV filters DSSSD#1 & #2
ASIC check all FEE64s
Attachments 24 & 25 1.8.W spectra 20us FSR
Attachment 26 ADC data item stats
Attachment 27 DSSSD bias & leakage current
Conclusion - aida09-aida12 no change, aida13-aida16 -> 300-400k
I do not know why there's a difference between DSSSD#1 & #2 but more important point (probably) no improvement aida09-aida12
Thorn Lab HV filters removed - status quo ante restored
18.02 Remove LK2 & LK4 all top p+n adaptor PCBs (aida13, 5, 14, 9, 1, & 10)
ASIC check all FEE64s
Attachments 28 & 29 1.8.W spectra 20us FSR
Attachment 30 ADC data item stats
Attachment 31 DSSSD bias & leakage current
Conclusion - no change cf. 16.40 test
19.10 Re-order power cabling at AIDA FEE64 PSUs from ...
Top 1-3 2-4 9-10 11-12
Bottom 5-7 6-8 13-14 15-16
to ...
Top 1-2 3-4 9-10 11-12
Bottom 5-6 7-8 13-14 15-16
ASIC check all FEE64s
Attachments 32 & 33 1.8.W spectra 20us FSR
Attachment 34 ADC data item stats
Attachment 35 DSSSD bias & leakage current
Conclusion - all p+n FEE64 rates c. 100k, or less, n+n FEE64 rates c. 400k
FEE64 adaptor PCB config
LK2-LK3-LK4 fitted for all bottom p+n FEE64s (aida11, 3, 12, 15, 7, 16)
LK1 fitted n+n FEE64s aida06 & aida02 *only* |
|
Sat Apr 2 10:42:49 2022, TD, Saturday 2 April 21x
|
11.10 Found aida08 not running - merger/TapeServer stalled
Restart required power cycle of all FEE64s
*all* ADC calibrations failed during system wide checks it was necessary to use FADC align & control (act on all FEE64 modules selected) to calibrate - first pass
12/16 calibrated, successive individual re-calibrations calibrated remaining FEE64s
ASIC settings 2021Apr29-13-16-00
slow comparator 0x2f
BNC PB-5
amplitude 1.0V
attenuation x1
polarity +
tail pulse
tau_d 1ms
rate 25Hz
Attachments 1-4 1.8.W n+n spectra 20us, 200us, 2ms, 20ms FSR
Attachments 5-8 1.8.W p+n spectra 20ms, 2ms, 200us, 20us FSR
Attachment 9 per FEE64 1.8.L spectra n+n strips
aida04 pulser peak width 387 ch FWHM
Attachment 10 per FEE64 1.8.L spectra p+n strips
aida10 pulser peak width 93 ch FWHM
Attachment 11 per FEE64 Rate spectra
Attachments 12-15 all system wide checks OK
Attachment 16 ADC data item stats
Attachment 17 FEE64 temps OK
Attachment 18 DSSSD bias & leakage currents OK
15.45 check of ASIC settings cf. https://www2.ph.ed.ac.uk/~td/AIDA/Information/Default%20AIDA%20ASIC%20Parameters.txt
Differences from default AIDA ASIC parameters
---------------------------------------------
Input Polarity
Offset Title Positive Negative Notes
12 slow comparator threshold 0x2f->0xa 100keV nominal
14 fast comparator threshold HEC 0xf->0x02 200MeV nominal
15 fast comparator threshold LEC/MEC 0xf->0xff > LEC/MEC nominal FSR
18 preAmp reference 0xb2 0x20->0x30
21 Ibias LF feedback 0x08 0xb->0xf
26 diode link threshold 0xca->0xbf 0x11->0x23 decrease switch threshold
(front) p+n junction strips - positive input polarity
(back) n+n ohmic strips - negative input polarity
All looks OK - variations from default settings are those used at RIKEN
16:45 FEE64 adaptor PCB config
LK1 LK2 LK3 LK4
p+n n/c o * o
n+n o o n/c o
o = jumper fitted
n/c = jumper not fitted
* = top, middle FEE64s - n+n bias ring ground for Si wafer #2
bottom, middle FEE64s - DSSSD PCB gnd
DSSSD#1 & #2 bias via standard coaxial cable to top p+n FEE64 adaptor PCBs
17.05 aida09 or aida13 cable braid not secured to ground - cable tag dia too large - now sandwiched between correctly sized cable tags
no obvious difference to adc data item rates
17.20 LK1 removed for all n+n PCBs
attachment 19 - adc data item stats
18.55 LK2/LK4 removed for all n+n PCBs
attachment 20 - adc data item stats
19.10 power cycle FEE64s
attachment 21 - adc data item stats |
|
Wed Mar 9 10:15:56 2022, NH TD, Wednesday 9 March - noise tests contd. 38x
|
11.15 - S4 is currently closed no access
If access possible (should be) plan is
Re-attach ribbon cable braids
Re-attach DSSSD middle wafer rear g/r (LK3)
Re-attach DSSSD ground (LK2?)
See difference in rates, expectation is braid should restore most p+n rates
Once status quo ante achieved explore ASIC settings to identify preamp feedback and shaping time options to stabilise preamp output and optimise signal:noise.
aida12 Peak width = 84.73
aida02 Peak width = 526.68
Attachment 1 - Stats
Attachment 2 - Per FEE Rates
Attachments 3,4 - Waveforms
Attachments 5,6 - Pulser Peaks
Attachment 7 - HV Bias. Leakage current recovered and does not seem to be ramping up
16.00 - Attach LK3 jumpers to aidas 1, 3, 5, 7 (DSSD ground and middle rear g/r)
Attachment 8 - Stats
Attachment 9 - Per FEE Rates
Attachment 10, 11 - Waveforms
Attachment 12, 13 - Pulser Peaks
aida12 Peak width = 78.51
aida02 Peak width = 480.90
No major change, FEES 1-8 are all noisy and FEES 9-16 are quiet
aida01, aida05 waveforms very noticably bad (100 kHz), aida03, aida07 waveforms seem OK
16.45 - Attach LK2, LK4 jumpers to all FEEs (field plane grounding)
No significant changes
Attachment 14 - Stats
Attachment 15 - Per FEE Rates
Attachment 16, 17 - Pulser Peaks
Attachment 18, 19 - Waveforms
aida12 Peak width = 71.28
aida02 Peak width = 458.18
Remove LK3 jumpers
aida12 Peak width = 71.43
aida02 Peak width = 496.05
Attachment 20 - Stats
Attachment 21 - Per FEE Rates
Attachment 22, 23 - Pulser Peaks
Attachment 24, 25 - Waveforms
Re-add jumpers - attachments 26-28
aida12 Peak width = 87.42
aida02 Peak width = 572.24
17.45 Directly bias from the p+n FEEs using SHV->BNC->Lemo - attachments 29-33
aida12 Peak width = 87.87
aida02 Peak width = 504.41
The correlation between high 'ADC data item' rate and the noise observed on the corresponding 1.8.W spectrum is not clear *except* for aida01 & aida05 - see also attachments 34-35
ADC data item stats - attachment 36
DSSSD bias & leakage current OK - attachment 37
FEE64 temperatures OK - attachment 38
all system wide checks OK *except aida11 clock fail status 6 |
|
Tue Mar 8 10:26:56 2022, TD NH, Tuesday 8 March 2022 40x
|
11.25 System wide checks OK except aida06 clock fail status 6 - attachments 1-13
ADC data item stats - attachment 14
FEE64 temperatures OK - attachment 15
DSSSD bias & leakage currents - attachment 16
DSSSD#1 OK. DSSSD#2 leakage current has increased from c.5uA to c. 11uA overnight.
11.43 per FEE64 1.8.W spectra - 20us, 200us, 2ms, 20ms FSR - attachments 17-24
per FEE64 1.8.L spectra - attachments 25-26
aida12 1.8.L pulser peak width 143 ch FWHM
aida02 1.8.L pulser peak width 439 ch FWHM
Per FEE64 rate spectra - attachment 27
12.00 Cycled DSSSD#2 bias from -100V to 0 to -100V leakage current -7.7uA but ramping slowly (c. 5nA/10s ... ?)
13.26 DSSSD#2 bias -100V leakage current -8.54uA
15.46 - Noticed that DSSSD#1 braid no longer has filter, DSSSD#1 core still does. DSSSD#2 is unfiltered on both.
- Swap FEE64 power connectors #3 with #4, and #6 with #7, this means both n+n FEE64s are on the same paired channel
No significant change to stats
- Notice braid was only connected to FEEs 4 and 8, which meant beam-left bias guard ring 0v was floating. Use T to bring bias braid over to FEES 2 and 6 as well.
Middle bias guard ring 0v is still floating
No significant change to stats, amplitude of 100 kHz waveform in n+n waves seems attenuated though
aida12 1.8.L pulser peak width 76 ch FWHM
aida02 1.8.L pulser peak width 438 ch FWHM
Attachment 28 - HV leakage current
Attachment 29 - FEE ADC stats
Attachment 30 - p+n side waveforms
Attachment 31 - n+n side waveforms
Attachment 32 - p+n pulser peak widths
Attachment 33 - n+n pulser peak widths
15.55 - Reattach filter to DSSSD#1 braid
No major change, possible improvement in waveforms
Attachment 34 - Stats
Attachment 35,36 - waveforms
16.46 - Reattach LK1 jumper to FEES 2, 4, 6, 8
Waveforms look OK, p+n rate slightly worse?
Attachment 37 - Stats
Attachment 38, 39 - waveforms
Attachment 40 - Per FEE Rates |
|