Baking halted on 23/9/21 16:16 as connection to TC08 module was lost. USB cable connection to TC08 module appears to have been damaged in shipment. USB hub and cable replaced, connection re-established and baking restarted 17:27. 

Ramping of baking limited to 40C by the maximum difference between parts of the chamber being too high, this safety feature prevents high thermal gradients. Limitation caused by uneven heating due to placement of heating elements resulting in the gate valve end of the chamber being much cooler than the rest of chamber. The pressure increased to ~8e-7mbar at 40C due to increased outgassing. Baking stopped at 07:00 24/9/21, heating elements were repositioned and the baking jacket reassembled. Code recompiled to include the rate and temperatures limits from elog 76.

Baking restarted at 10:00

I have (fingers crossed) got the baking stepping up nicely now. I have used some of the outer shell to act as a shield and to direct airflow towards the front and back of the baking volume. I also moved the RE-72 thermocouples to a higher temperature region and replaced the broken thermocouples. The program is on automatic mode and has currently stepped up to 40C with the max diff reduced to ~4C.

I will continue monitoring for a bit but all looks good at the moment. 

Additionally, our baking exploits over the weekend got us down to 9e-9 mbar when I came in this morning.

Bakeout test completed. Maximum temperature reached within baking volume was 120 degrees, with baking stopped by the program due to detection of negative temperature gradients. Negative temperature gradients due to a couple of thermocouples becoming unsecured and moving to cooler part of baking volume. Attached documents show temperatures of thermocouples. The colour of plots are linked (all of chamber temperatures are blue etc). Temperature gradient across the chamber is low (less than 10 degrees). Heat loss at the front of the chamber is apparent in the air temperature gradient across the baking volume and between the RE72 temperatures. 

Thermocouples have been resecured (extra tape so hopefully won't fall again) and some repositioned. Heating jacket has been remounted at the front to prevent heat losses seen in first test. Quick heating test was performed this morning up to 50 degrees and it appears heat loss at the front of the baking volume is much reduced. 

Weeklong bakeout will begin monday morning. 

Initial bakeout started which will run until friday, temperature had reached 44 degrees when I left the lab. 

The bottom valve has now been installed on the main chamber

Attached are plots for the previous bakeout of CARME which may aid in the bakeout to come in the following week.  

Plots relate the heater temperatures and heater powers with the chamber temperature (internal floating thermocouple) and pressure inside CARME. 

The Chamber has continued to pump overnight and we have reached a pressure of 3.3e-6 mbar as of 10:15. Power cable for the hot cathode gauge was found. Gauge did not give a reading so pin connections were checked, all is okay so it may be thepressure is still too high within the chamber, gauge was thus turned off. I have attached the RGA from this morning which has increased accuracy so has been cleared up for most of the noise from yesterday. I have begun removing the covers for the neg-ion pumps, attached is the how it looks without the cover. The covers have strong magnets in them so I will put in a box far away from our electronics.

10:15    3.3e-6 mbar (cart)

11:27    3.2e-6 mbar (cart)

13:26    3.2e-6 mbar (cart)

16:00    3.2e-6 mbar (cart)

I have begun manually reducing the temperature for the bakeout, to observe the rate of cooling across the vessel. I have noticed a bug in the program, the rate of each thermocouple reads as if it is increasing despite the decrease in temperature of the thermocouple. The actual temperatures and averages appear to be working okay. 

09:43   RE-72 temperatures are 135 deg. Temperature set to 125 deg.

11:01   RE-72 temperatures are 125 deg. Chamber temps equillibriating, average chamber temperature 125.5 deg and max difference is ~3 deg. Temperature set to 100 deg.

11:14   RE-72 temperatures are 115 deg. Chamber max difference exceeds 10 deg, chamber average is 115 deg. Temperature set to 115 deg will wait to equilllibriate. Recommend not to lower temperature by >10 deg. Top of the chamber cools much slower than the bottom. 

13:26   RE-72 temperatures are 115 deg. Chamber average is 115.3 deg, chamber max difference is 2.8 deg. Temperature set to 105 deg.

14:20 Previously unobserved bug occured - all temperature display frozen. Rates still OK. Temperature control still OK. Rebooted Baking.x remotely. Back OK. Reduced temperature to 90 C. See attached temperature plot before rebooting.

18:00 Temperature reduced to 80 deg.

21:25 Temperature reduced to 75 deg.

14/08/23

Temperature in the baking volume is ~ 42 C and the pressure is 4.6e-8 mbar. Current heaters set point is 135 C. This will now be increased to 200 C to start increasing the baking temperature more significantly.

Some issues with the interaction chamber heaters were noticed this morning. This included very large increases in temperature despite only small increases in the setpoint. When this occurred the heater channels were simply turned off. Channel 3 on the interaction chamber (main jacket on the centre of the chamber was also observed to smoke slightly). This smoking was seen when the temperature for channel 3 was ~ 70 C. 

Changing the settings of these heaters appears to have resolved most of the issues. The heaters now ramp in a much more controlled manner and remain roughly constant at the setpoint value.  The interaction chamber heaters were all increased to 70 C with no issues observed. Channel 3 also appears OK.

The CARME heaters settings have also been changed and now the heaters temperature and power output do not oscillate as observed previously. Power output per heater is approximately 15 % of total at heater temperatures of 220 C, and this value remains consistent over time. The temperatures inside the baking volume are now ~ 50 C with the pressure equal to 7e-8 mbar. Heating has not been the priority while investigating the issues observed with the heaters.

As a precaution CARME will now be maintained at the 50C level. The interaction chamber and e-target temperatures have been set to 50 C also. If the system remains stable overnight we will again begin increasing the temperature in the morning.

15/08/23

Temperatures across the whole of YR09 have remained very stable overnight. Temperature of CARME has increased slightly and is now ~ 55 C. Pressure is ~1e-7 mbar. A brief lincrease in pressure was observed yesterday due to the de-gassing of the GSI ion pump on CARME. Plan is to now increase the temperatures of YR09 to the 100 C level 

Temperature is ~ 70 C. Heating is slower than expected as I am aiming to minimise thermal gradients across the chamber, which was previously done automatically by our baking code. Current heater temperature values are ~ 320 C. I have increased the temperatures across YR09 to 70 C to match carme . Pressure in CARME is 2.1e-7 mbar.

16/08/23 

The temperatures of the CARME heaters were further increased to ~ 420 C to further increase the chamber temperature. Average chamber temperatures of ~93C achieved. Heater temperatures can be pushed to 450C which should allow us to achieve 100 C. Will allow chamber to equillibriate as temperature gradient between top and bottom is quite large.

17/08/23  

Baking will be unsupervised over the weekend. To remain safe, the berylium window and the interaction chamber will be kept at a temperature of 50C. Carme will be reduced to ~60C during this period.

Attached are plots for the bakeout period concerning this week.  

Summary: Target not running. Background runs written to disk, some with beam some without.

19:27 Data file R17  running

      DSSSD positions out. Nikos will work on the target.
      Started a new run just after changing the DSSSD position
      No storage enabled
      All the checks are ok!

At 20:30 after 2h there was possible to open the cave again and Nikos started to cool down the target. However, is not clear if they can close the ring again...

22:12  The beam is back again. Cave closed and we are cooling downg the target!

Data file R18 started now.

DSSSD positions out. 

No storage disabled.

All checks ok. See attached files Work on the target.

Sunday 25 May 2025

09:45 Data file R18 running

DSSSD positions out. 

All checks ok!

12:05 Data file R18 running

DSSSD positions out. 

All checks ok!

13:55 Data file R18 running

DSSSD positions out. 

All checks ok!

15:50 Data file R19 running

DSSSD positions out. 

Beam is off.

All checks ok!

21:50

All checks OK.

Monday 26.05.25 09:15

All checks OK.

Summary: Target not running. Some background files written to disk, some with beam some without. 

09.27 DAQ going
      Switch from 'no storage' mode - alpha background
      Data file R13 

      All histograms & stats zero'd

      ASIC settings 2025Apr08-13.45.30
       slow comparator 0x32

      Pulser ON

      DSSSD bias & leakage currents OK - attachment 1-2 
      FEE64 temps OK - attachment 3
      ADC data item stats - attachment 4
      per FEE64 Rate spectra - attachment 5
      WR timestamp OK - attachment 6
      System wide checks OK *except* WR decoder/FPGA error - attachments 7-8
      Merger & TapeServer - attachment 9-10
      CRYRING vacuum & temperature - attachment 11-12

10.07 Laser group have completed their work in the CRYRING area - will now request 7Li beam
      Tape Server to 'no storage' mode

10.45 Beam 7Li1+ c. 1e6 
      Switch from 'no storage' mode - alpha background
      Data file R14
      All histograms & stats zero'd; online analysis restarted

11.35 per FEE64 1.8.L spectra - attachments 13-14
       pulser peak width aida03 78 ch FWHM, aida11 63 ch FWHM

      per FEE64 1.8.W spectra - 20us FSR - attachments 15-18

12.55 DSSSD bias & leakage currents OK - attachment 19-20
      FEE64 temps OK - attachment 21
      ADC data item stats - attachment 22

14.33 Switch Tape Server from 'no storage' mode
      Data file R15
      DSSSD positions Left 36.54mm, Right 64.60mm

16:22 Data file R15 still running

      DSSSD positions unchanged (Left 36.54mm, Right 64.60mm)
      All the checks are ok!


18:30 Data file R16  running

      DSSSD positions out. Nikos will work on the target.
      Started a new run just after changing the DSSSD position

      All the checks are ok!

12.08 DSSSD bias & leakage current - attachments 1-2
       CAEN logger program crashed sometime this am - 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
       All DSSSDS show effect of ambient temperature transient in CRYRING hall

       CRYRING vacuum and temperature - attachments 3-4

14:40

FEEs started up. Background run started. Pulser running in the at 1HZ, amplitude is 9000.
Note aida03 and aida04 set to MEC due to high rate >100k. This resulted in data rates ~3MB/s. Slow comparator thresholds set to 0x64 (1 MeV)
System checks OK. AIDA16 and ADC calibration check clock status fails. 
Run 10 started. 
Attachments 5,6,7,8,9 from start of run. Waveforms, ADC data items statistics, New merger, Tape server respectively. 
Will continue to monitor during the day until tonight when I will turn off the FEEs again. 

Run stopped. 
Noticed spike in leakage current for all detectors. 
This coincides with change in vacuum around the ring. Some operation is ongoing, all FEEs off, detectors off. 
See attachment 10 for leakage currents. 

Vacuum gauge in section 9 is back on to allow for ring interlocks.

29/04/25

Turned the FEEs on to check if aida08 is still connected to the coolant loop. Temperatures in normal range after startup. FEEs turned back off for now. 

Updated anydesk to 6.3.2 CentOS7 release.

Works now.

To log into appc218 desktop:
same login and password as to carme@atppc022.gsi.de

To start anydesk

1. make sure a monitor is plugged into the carme computer!
2. ssh into npg@carme-gsi
3. su terminal
4. killall anydesk
5. systemctl start anydesk
returns an anydesk backend, service and tray
Anydesk is now accesible 
 

Results of the fortran analyser programs for R54_14

No timewarps observed in the data
No dead time observed either.
Lots of idle time but expected with high thresholds and low noise

Analysis of data files G22-201 R79_10 and R79_24 - attachments 1-2

Observe HIGH deadtime for FEE64 aida11 (attachment 1) and aida16 (attachment 2) associated with *very* high pause/resume/HEC/disc data item rates.

R79_10

deadtime aida11 99.4%
pause/resume ~ 720Hz
HEC ~ 2800Hz
disc ~ 250kHz


R79_24

deadtime aida16 18.7%
pause/resume ~ 140Hz
HEC ~ 540Hz
disc ~ 50kHz

DAQ was left running last night from 19:30. Detector bias 80V with a leakage current ~3.4 uA. Pulser OFF.

Observed alphas in spectra overnightin the 20,000 to 28,000 channel range for the pn side and 36,000 to 44,000 range on the nn side of the detector. Zero energy noise peak is at channel 32000.

Alphas checked for AIDA5 and AIDA6 (pn) with ~150 alphas counted using a range 20,000-26,000/27,000 depending how large the noise peak tail is. Attached spectra show the spectra for the 4 ASICs of AIDA5 and 6.

Beam OFF. Run started 20/2/22 18:42

System checck OK, except white rabbit all fail

Temperatures OK

Leakage current 3.57 uA.

potentiometer = 20.28 mm

Beam OFF. Run started 20/2/22 18:42

System checck OK, except white rabbit all fail

Temperatures OK

Leakage current 3.57 uA.

potentiometer = 20.28 mm

Beam OFF. Run started 20/2/22 18:42

System checck OK, except white rabbit all fail

Temperatures OK

Leakage current 3.59 uA.

potentiometer = 20.28 mm

11:36 OH noticed a channel in aida03 was running hot. Did an asic load check and rate returned to normal.

          Online monitor also restarted.

Beam OFF. Run started 20/2/22 18:42

System checck OK, except white rabbit all fail

Temperatures OK

Leakage current 3.59 uA.

potentiometer = 20.28 mm

11:36 OH noticed a channel in aida03 was running hot. Did an asic load check and rate returned to normal.

          Online monitor also restarted.

15:06 Investigating the high rate in aida03 ASIC01 channel 11.
          Looking at the waveforms it seems channel 11 is consistently different.
          Attachment 1 shows a typical waveform for it

10:00

Check Leakage current: (see attachment 2)

Check NewMerger tab: (see attachment 5)

Check Fee temperatures: all green (see attachment 1)

Check statistics tab: ADC data items (see attachment 3)

                                 ADC coincidence-info #8 (see attachment 6)

                                 Good events (see attachment 7)

 Check Spectrum Browser tab: (see attachment 9)                 

Check the following plots:

                                         LowEnergyXYTotalDSSD0 (see attachment 9)

                                         LowEnergyExTotal (see attachment 10)

                                         LowEnergyEyTotal (see attachment 11)

Check system wide checks tab: White Rabbit error counter test result: Passed 0, Failed 5 (see attachment 8)