The analog readout of the Combivac controller for the IE514 ion gauge has been set up, readings are plotted to http://web-docs.gsi.de/~lestinsk/vacplot.php. Readings and plot should be updated every minute.

Attached are the plotted curves from vacuum and heater temperature (actual and set values from ISOHEAT controllers) during the bakeout process. Channel assignment as per post 433.

To test the detectors, adaptors were installed on the feed through flanges. A negative bias voltage was applied in steps of 10 V from 0 to 150 V. The V-I plots are attached for the four detectors. Three detectors - top right, top left, and bottom left (in the direction of the beam) - are fine. For the bottom right detector (in the direction of the beam), the current was fluctuating and was considerably high (1st test). The adaptors connecting to this detector were removed and checked by applying the bias voltage which showed zero current for voltages ranging from 0 to - 150 V, confirming the adaptors to be fine. They were then exchanged by other adaptors and the V-I test was repeated again (2nd test) with fluctuating and high current values. One of the flanges connecting to this detector was found to be light-tight. These tests were done at an ambient temperature of 21 degrees. Also, we couldn't find the rest of the three SHV to 2x Lemo 00 cables for the detector HV.

Today, the foil was opened, the pins on the bottom right detector were checked and looked fine, the right-hand arm was moved a bit in and then out, and the foil was tightly closed again. The negative bias voltage was applied from 0 to 50 V in steps of 10 V. During the measurement, the lights in the cave were switched off to ensure no leakage current from the light*. The results are shown in Attachment 1. To condition the detector, it was left at a negative bias voltage of 50 V for ~ 3 hours with lights on. No increase in current was seen (see Attachment 2), indicating the chamber was nicely covered with foil. Then the negative voltage was increased from 60 V to 150 V in steps of 10 V. No large current readings, like yesterday, were seen today (see Attachment 3). The detector was then left at -150 V for ~ 30 minutes with the current to be nearly stable with fluctuations in the range of 70-100 nA. The foil was then taken off to check if there are any dust particles on the detector surface. As can be seen in Attachment 6, some dust particle was found at the bias/multi-guard ring (MGR) boundary structures of the DSSSD. The area was then nicely cleaned with isopropanol + lab tissue wipe (see Attachment 7) and the chamber was covered with aluminum foil again. The negative bias voltage was applied from 0 to 150 V in steps of 10 V again and the results can be seen in attachment 5, indicating the response of the detector to be normal, unlike yesterday. Before calling the day off, the detector was left at -150 V overnight.

* Every time, before switching off the lights, it was checked that no one else was in the cave.

Since yesterday evening, the bottom right detector was at -150 V. In the morning, the current was quite stable ~ 6.77 uA. The bias was switched off, the foils opened, both of the detector arms were moved in and out three times, and the chamber was tightly covered again. A negative bias voltage was applied from 0 to 150 V in steps of 10 V one by one to all four detectors, and the V-I results can be seen in Attachments 1-4. All detectors seem to be fine. The variation of the current with time at a constant bias voltage of -150 V was checked for all detectors and the results are in Attachments 5-8. Also, with an applied bias voltage of -150 V to the bottom right and left detector, the detector arms were moved in and out three times which showed a variation of 1-2 nA and 1 nA in the leakage current. For further conditioning of the bottom right detector, it is again left with a negative bias voltage of 150 V over the weekend.

Heater channel layouts for the interaction chamber and carme in attached documents. 

Updated thermocouple positions; (front section is closest to gas-target, rear section is moving detector end)

• 1-1 Internal TC 1
• 1-2 Internal TC 2
• 1-3 Internal TC 3
• 1-4 CARME - top of the front section
• 1-5 CARME - bottom of the front section
• 1-6 CARME - top of the mid section
• 1-7 CARME - middle of the mid section
• 1-8 CARME - bottom of the mid section
• 2-1 Float - bottom of mid section 
• 2-2 CARME - middle of rear section 
• 2-3 Float - middle of the front section
• 2-4 CARME - bottom VAT valve
• 2-5 Float - middle of the rear section 
• 2-6 CARME - Top elbow
• 2-7 Float - top of the mid section
• 2-8 CARME - rear beam pipe

Thermocouple posiitons have been updated in the monitoring code, including the averages for the CARME chamber. 

In this last hour we have been playing with the cryostat temperature as dictated by Nikos, in order to have the target working properly. For this, we have increased from 80K to 140K the cryostat temperature then we saw again target until we didn't. Then we went down again to 80K. After a few minutes, with a really nice target again was gone, so we increased the temperature to 120K at 00:19. At 00:27 decrease from 120K to 80K.

Ring current 8e7 particles/s

Merger, Tape server (WS3): 1580 kB/s writing ok

Leakage current (WS4): 3.27 uA

DAQ (WS2): temperature checked, clock status: ok, adc calibration: ok, white rabbit check: failed

Online monitoring (WS 5): done

Tested every strain relief. M3 screws get stuck at different points in each hole. Only one good hole out of 16
(2x8).
They were tested in Edinburgh - unclear if this is a result of baking at high temperatures, or bad screws, or
something else.

Easiest solution may be to re-machine holes and clean the connectors here in GSI.
Now investigating options.

Found CARME in XHV at 1.1E-11 mbar. Chamber temperature around 30C cooling slowly.

Closed GV to top turbo. Pressure goes up but appears to recover around 2.5E-11 mbar, on line with several previous observations that sectioning off the turbo results in a higher reading in the IE514.

Left turbo on. Remember to not turn it off when removing the tent.

14.00 CARME vacuum c. 1.8e-10 mbar - see attachment 1

open water inlet/outlet taps

NIM bin (MACBs, Ortec 480 Pulser, CAEN N1419ET) switched ON

USB-controlled ac mains relay switched ON - water & interlock LEDs active

Require VETAR2 (previous returned to Nik Kurz) and network switch (currently with AIDA@DESPEC)

Turbo pump ON - normal operation

Ion pumps ON - normal operation

16.30 ML informs us that ambient temperature of CRYRING cave has been increased from c. 16 deg C to c. 21 deg C and that this is likely the cause of the change in vacuum 
pressure in YR09 and the rest of the storage ring.

obtained VETAR2 and crate 

anydesk restarted

11.30 CRYRING vacuum and temperature - attachments 1-2

      DSSSD bias & leakage current - attachment 3
       c. 1uA reduction in DSSSD#1 and DSSSD#2 leakage currents cf. yesterday but remain high cf.June 2024

      FEE64 temps OK - attachment 4

      System wide checks - clock fail aida16 - attachments 5-6
       aida16 global clock status 0x6 - non-critical failure, often resolved by a power cycle.

      ADC data item stats - attachment 7
       DSSSD #3 n+n Ohmic side FEE64 rates return to c. normal cf. yesterday


      per FEE64 Rate spectra - attachment 8

      per FEE64 1.8.L spectra - attachments 9-10
       pulser peak width aida11 55 ch FWHM, aida09 75 ch FWHM
       only DSSSD #3 aida11/aida12 have expected peak widths

      per FEE64 1.8.W spectra - 20us FSR - attachments 11-13

      WR timestamps OK - attachment 14

17.29 DSSSD bias & leakage current - attachment 15
      
      FEE64 temps OK - attachment 16

      WR timestamps OK - attachment 17

      ADC data item stats - attachment 18

      per FEE64 Rate spectra - attachment 19

17.35 All histograms & stats zero'd
      Start run
      Data file APR25/R5
      alpha background

      EG&G Ortec 448 Pulser
       amplituide 90,000
       normalise 5.00
       x5 attenuator IN
       INT OSC
       frequency 2Hz
       t_r 100ns
       tau_d 50us (1000us setting does not work)
       polarity +

       ASIC settings 2025Apr08-13.45.30
        slow comparator 0x64
        aida03, aida04, aida09, aida10 LEC/EC range setting -> MEC

      per FEE64 Rate spectra - attachment 20

      Merger & Tape Server - attachment 21-22

20.41 DAQ continues
      Data file APR25/R5_7

      DSSSD bias & leakage current - attachment 23
      
      FEE64 temps OK - attachment 24

      ADC data item stats - attachment 25

      Merger & Tape Server - attachment 26-27

      per FEE64 Rate spectra - attachment 19

        

09.00 CARME IE514 5.1e-11mbar

09.15 IE514 not working - one of cables disconnected?

      DSSSD #1 bias cable changed from SHV - Lemo 00.250 to SHV - 2x Lemo 00.250

      DSSSD #1 & #2 LK1 removed from n+n Ohmic side bias FEE64s

      aida11 HDMI cabling re-seated at MACB

10.26 DSSSD bias OK - attachment 1
      Ambient temperature +16.2 deg C

10.30 ADC data item stats OK - attachment 2
      aida06 & aida15 > 100k, all others c. 3k consistent with 50Hz pulser

10.34 per FEE64 Rate spectra - attachment 3
       OK except for known issues aida05, aida07 and aida16 - all others OK

      per p+n FEE64s 1.8.L spectra - attachment 4
       pulser peak width 52 ch FWHM aida11- double peaking DSSSD #1 & #2

      per n+n FEE64s 1.8.L spectra - attachment 7
       pulser peak width 77 ch FWHM aida04 - more uniform noise across all DSSSDs

10.42 per FEE64 1.8.W spectra - 20us FSR - attachments 5-6

11:00 LK2 removed from aida01-04. Configuration for all adaptor cards/FEE modules is now the same. No other change to the setup.

12:00 FEEs power on, bias to 150 V. No change in bias observed. 

12.02 ADC data item stats OK 
      aida06 & aida15 > 100k, all others c. 3k consistent with 50Hz pulser

12.07 per FEE64 Rate spectra 
       OK except for known issues aida05, aida07 and aida16 - all others OK
      
12:09  per p+n FEE64s 1.8.L spectra 
       We now observe a large peak around chn 30,000 on all FEEs. Perhaps an effect of some change in the ring?
       pulser peak width 53 ch FWHM aida11- still observe double peaking DSSSD #1 & #2

      per n+n FEE64s 1.8.L spectra 
      Lots of events at ~chn 65,000 - double peaking now observed on aida03 and aida04
      pulser peak width 93 ch FWHM aida14 

12.20 per FEE64 1.8.W spectra - 20us FSR 

      Perhaps bias was off while acquiring and spectra was not cleared properly. Re-do tests

13:40 ADC data item stats OK - attachment 7 
      aida06 & aida15 > 100k, all others c. 3k consistent with 50Hz pulser

       per FEE64 Rate spectra - attachment 8
       OK except for known issues aida05, aida07 and aida16 - all others OK

      per p+n FEE64s 1.8.L spectra - attachment 9 
       pulser peak width 55 ch FWHM aida11- double peaking DSSSD #1 & #2

      per n+n FEE64s 1.8.L spectra - attachment 10
       pulser peak width 65 ch FWHM aida14 - more uniform noise across all DSSSDs

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

      With help from NH updated firmware on all MACB modules to version 4/20 - see https://elog.ph.ed.ac.uk/CARME/482

      Timestamps for all FEE modules now correct - attachment 13

      MAC address of aida07 was found to be 41-b4-16 not 41-d4-16 as was labelled on the FEE module
       re-labelled FEE64
       dhcpd.conf and MIDAS startup.tcl updated, dhcpd and MIDAS 8015 server restarted - aida07 is now working OK
 
      CAEN N1419ET internal jumper fitted - outputs are no longer floating

15:20 ADC data item stats OK 
      aida06 & aida15 > 100k, all others c. 3k consistent with 50Hz pulser - attachment 14

       per FEE64 Rate spectra
       OK except for known issues aida05, and aida16 - all others OK  - attachment 15

      per p+n FEE64s 1.8.L spectra -
       pulser peak width 50 ch FWHM aida11- double peaking DSSSD #1 & #2 - attachment 16

      per n+n FEE64s 1.8.L spectra 
       pulser peak width 67 ch FWHM aida14 - more uniform noise across all DSSSDs

       per FEE64 1.8.W spectra - 20us FSR - aida14 missing from waveforms - attachments 17,18
 
   Swapped the test inputs so that +ve is now from the inverter and -ve direct from pulser.  - attachments 19,20. Observed reduced noise for when plugged directly into the pulser than when connected from the inverter. 



   Lowered threshold from 0x64 (1 MeV) to 0x20 (320 keV) - attachment 21, 22 - Observed increase in rates, in particular for the DSSD #1,2 pn side. Conclusion -> increased pulser width for DSSD #1,2 is real and not from the pulser
 


   aida01 lemo to water pipe (chamber ground) connection installed 

   ADC data item stats OK 
      aida06 & aida15 > 100k, all others c. 3k consistent with 50Hz pulser 

       per FEE64 Rate spectra
       OK except for known issues aida16 - all others OK 

      per p+n FEE64s 1.8.L spectra -
       pulser peak width 48 ch FWHM aida11- double peaking DSSSD #1 & #2 - attachment 23

      per n+n FEE64s 1.8.L spectra 
       pulser peak width 67 ch FWHM aida14 - attachment 24

       per FEE64 1.8.W spectra - 20us FSR - slightly reduced 100 kHz on pn waveforms - attachments 25,26

   Disconnected aida06 and replaced with the spare FEE module (mac address: 42:0d:16). Power cycled and updated config files. 

   ADC data item stats OK 
      aida15 > 100k, all others including aida06 c. 3k consistent with 50Hz pulser - attachment 27

       per FEE64 Rate spectra
       OK except for known issues aida16 - all others OK - attachment 28

      per p+n FEE64s 1.8.L spectra -
       pulser peak width 48 ch FWHM aida11- no longer observe double peaking DSSSD #1 & #2 but the pulser peaks are still broader compared to DSSD #3,4 - attachment 29

      per n+n FEE64s 1.8.L spectra 
       pulser peak width 55 ch FWHM aida14 - attachment 30

       per FEE64 1.8.W spectra - 20us FSR - greatly reduced 100 kHz on pn waveforms, dodgy FEE previously aida06 must@ve had some impact on DSSD#1,2 - attachments 31,32
      

09.40 CARME IE514 1.79e-8 mbar, ambient temperature 20.7 deg C

      CARME bakeout monitor, ELOTECH R4000 temperature controller front panel and Grafana bakeout dashboard- attachments 1-3

      No change to ELOTECH R4000 set point

16:20

DSSD bias and leakage current values:

-99.99 V

-13.2535 uA

Pulsar peak widths (ch FWHM)

aida01 ~ 100

aida02 ~ 103

aida03 ~ 128

aida04 ~ 133

aida05 ~ 22

Pretty similar to what was found in august https://elog.ph.ed.ac.uk/CARME/377

09.07 IE514 pressure 6.4e-11 mbar, ambient temperature +20.3 deg C

      Using appc218 ( account carme ) workstation by the CARME 19" rack 
     
      ssh pi@carmebakingpi

      Re-connect to bakeout monitor app 

      screen -dR

      See attcahment 1


12.02 Vacuum group ion pump disconnected and RGA removed from CARME chamber -  outside of CARME bakeout tent 'closed' - see attachments 2-4

      Vacuum group IE514 to be disconnected


14.45 Vacuum group disconnect their IE514

      Inside of CARME bakeout tent closed

      Photos of the CARME bakeout tent inside and outside CRYRING - see attachments 5-7  

18.43 ASIC settings 2024Feb08-15.59.09

aida06 pulser peak width 66 ch FWHM

Turbo-pump Issue approximately 13:00 22/9/20.

While moving the baking octagon into position, the power connector became disconnected from the turbo pump. The pump controller provided the warnings of connector failure and high pump load (probably due to it reading the frequency of the pump as 0 Hz when disconnected and thinking this was due to a high pump load). I believe the valve then was slightly knocked causing a vibration in the turbo, which couldn't be corrected for by the controller as it had become disconnected. The result of this was the turbo noise growing louder (similar to the turbo in the edinburgh lab when venting). At the time I didn't know the connector had become disconnected, as it was still attached to the turbo, and due to the warning messages on the controller, noise of the turbo and lack of information on what had happend, I decided to close the valve connecting the chamber to the turbo and vent the backing line up to the turbo and in order to remove and replace the turbo. 

The chamber was in the high -6 mbar range when the valve was closed. The turbo was replaced with the second turbo which began pumping again (with the power connector properly secured this time) on 23/9/20. The turbo doesn't show any obvious sign of damage, the blades in it are free to spin with no hindrance, but we will have to get it tested by the vac lab to be sure. 

07.40 DSSSD bias & leakage current - attachments 1-3
       CAEN logger program crashed c. 18.00 April 20 - now restarted
       DSSSD #2 and DSSSD #4 OK - DSSSD #4 stable since c. 03:00 20.4.25
       DSSSD #1 and DSSSD #3 remain high with slow decrease (ambient temperature approx stable c. 16.5 deg C)

       CRYRING vacuum and temperature - attachments 4-5

10.00 Outflow manifold returned from workshop with leaking attachment point welding re-worked.

11.30 Outflow hoses re-attached to outflow manifold. Faulty male Swagelok replaced.
      Outflow manifold tested on floor - no leaks observed.

      Mounted outflow manifold. All inflow/outflow hoses attached to FEE64s - see attachments 1-4.
      FEE64 #11 detached adaptor PCB - temporarily secured by cable tie.

      Inflow/outflow valves opened. Pin hole leak observed at 3/8" connector gasket - indicated by arrow attachment 
3.
      Leak fixed by tightening fitting.

      1x spare inflow/outflow connected together - attachment 4.

11.40 CARME IE514 3.8e-11mbar, ambient temperature 16.5 deg C

15.05 8x AIDA FEE64 power cables ( #1 - #8 ) installed FEE64s #1 - #8
      Note - Samtec lock clips broken on 3 of 8 cables due to careless handling/poor storage
      AIDA FEE64 power cables tied to one of the FEE64 copper coolant pipes.

      See attachments 5-7

15.30 USB-controlled ac mains relay - USB connected to RPi CARMEbakingpi currently used for CAEN N1419ET 
      Rear panel key switched to override - no flow/d.p. sensors currently installed - front panel water ( yellow ) and override ( red ) LEDs active.

16.15 Transfer CARMEbakingpi from CRYRING network to AIDA 24-port Gbit network switch connected to carme-gsi
      CARMEbakingpi becomes nnrpi1 p- can connect OK via ssh from carme-gsi

      Start server ( port 8015 ) manually

      ssh pi@nnrpi1
      
      /MIDAS/Tcl/Httpd/linux-arm/Tcl-Httpd-server &

      See attachment 8

Attachments 1-3 - 2 of 4 SAES D2000 installed at same ports used for STFC DL XHV tests