 Thu Sep 24 10:04:58 2020, JM, TD, Thursday 24 September 
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Following overnight pumping by Leybold turbo pump
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Tue Feb 1 14:43:20 2022, JM, TD, Detector Bias, FEEs
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Detector is not biasing as it has in previous tests. Last bias 15/1/22 see previous elogs, max leakage current ~10 uA at 150V
Detector bias increases well above 10uA for voltages as low as 30-40V. Optical windows covered, Y09 valves closed, large ion pump OFF and both
ion gauges OFF produces similar results but with a slightly lower leakage current. |
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Wed Feb 2 21:53:32 2022, JM, TD, Detector Bias
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FEE mounts for 5,6,7,8 disassembled to access adaptor boards. No sign of debris which could cause short on adaptor boards.
Adaptor boards removed and checked against spares with multimeter. Both show same characteristics. Pins on feedthrough checked using multimeter.
No longer see -18.5 KOhm between bias pins, no see 140 kOhm which is similar to bias pin to non bias pin from prevous tests. |
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Tue Aug 9 16:07:33 2022, JM, TD, Anydesk setup command line
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To log into appc218 desktop:
same login and password as to carme@atppc022.gsi.de
To start anydesk |
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Thu Aug 11 09:25:13 2022, JM, TD, Noise tests 14x
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Moved pneumatic motor in and out several revolutions
Biased detector up to 100 V, I ~ 12.4 uA ambient temp c. 21 deg C |
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Fri Aug 12 15:12:37 2022, JM, TD, CARME measurements 9x
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measurement 1 -string
intermediate (smaller) chamber - 2144 (mm) circumference, measured half circumference 1072 mm
outer (larger) chamber - 2160 (mm) circumference, measured 1/4 circumference 540mm |
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Sat Aug 13 10:23:59 2022, JM, TD, Noise tests pt3 and pulser walk 15x
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Waveforms and discriminator ON. Pulser re-connected to all fees via daisy chain. V=100v, I=8.36uA
Pulser peak widths (ch FWHM) |
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Wed Jun 21 18:47:36 2023, JM, TD, Closing CARME
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Internal CARME installations complete.
New strain reliefs (flange side) installed on each cable harness.
2x sets of SAES UHV1400 NEG pumps installed and connected
to 2x power feed-through flanges -> continuity checked OK -> 3x UHV1400 modules gives a resistance of 7.4 Ohms, 2x UHV1400 modules gives resistance |
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Thu Jun 22 18:58:02 2023, JM, TD, Slide back onto ring
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The wire seal has been tightend further to 160 Nm. Open neg feed-through flange has also been fully tightend.
The CARME chamber was then slid back onto the aluminium frame on the ring. Two carriages were damaged during the sliding process, which have
now been replaced. Carriages were replaced by lifting one end of the upper frame section using the crane by only ~1mm. This was sufficient to slide out |
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Sat Jun 24 10:38:42 2023, JM, TD, Section 9 closed, begin pumping
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23/06/23
The CARME chamber and interaction chamber were connected and section 9 has been fully closed. New valves have been installed on the interaction
chamber, in addition to new diamond windows. A leak cart has been connected to the backing line of CARME. Before begining the pumpdown, the manual valve |
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Sun Jun 25 09:41:06 2023, JM, TD, Normal turbo-pump operation 6x
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| Attached are images showing the messages for normal turbo-pump operation |
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Sun Jun 25 10:08:30 2023, JM, TD, Pump-down
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23/06/23
Pumpdown started with the scroll pump 17:15 . The turbo-pump was started 17:55. Gate valve was closed and the turbo turned of at 19:20 due to
no working fan on the turbo. |
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Sun Jun 25 14:30:06 2023, JM, TD, Motors bias test
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The motors were moved using the pneumatic only, in and out for several cycles to gauge the effect on the vacuum. For the left arm no change in pressure
was observed. For the right arm a small increase of 0.04e-7 mbar was observed which was quickly reduced by the turbo.
The detectors were then biased to see if movement had any effect on the leakage current (large effects were observed in 2021 beamtime). Movement |
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Mon Jun 26 14:49:05 2023, JM, TD, CARME vented
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26/06/23
This morning the pressure was 4e-7 mbar. The bolts on the windows and the large flange on the bottom of the interaction chamber were tightend.
No leak was present on the windows following tightening. However, the leak on the rotatable flange, although decreased in magnitude, was still in the 1e-9 |
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Tue Jan 30 09:14:50 2024, JM, TD, Tuesday 30 January 32x
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09.00 CARME IE514 5.1e-11mbar
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Wed Jan 31 09:49:38 2024, JM, TD, Optimising - Wednesday 31 25x
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Removed ground from DSSD #1 to the chamber and set MACBs so that timestamp is from the NIM WR emulator not the VME VETAR2.
Root MACB mode 0x3 -> 0xd - all other MACB modes 0x3 ( unchanged ).
No timestamps observed from the emulator. Re-set to take timestamps from the VETAR" unit -> all timestamps observed. |
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Thu Feb 8 14:59:59 2024, JM, TD, Change p+n FEE64 settings
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ASIC settings for the pn FEEs has been reset to the default aida settings. This was done to combat the observed dropping of several channels in pn only
FEE modules
following motors movement. This effect was also observed in 2022 in several pulser walkthroughs conducted pre and post detector movement. No dropped channels |
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Wed May 21 14:38:22 2025, JM, TD, R4 and R5 - background 7x
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15:30
Waiting for the target to cool down. ETA is 16:30 for cooling to be finished and then we need to try and make target.
While waiting we havve been running a background (R3). I noticed the rates on aida10 had increased (300k) and aida09 were slowlly creeping up |
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Tue Jun 11 08:34:50 2024, JM, RSS, JS, Run 61 - beam on target
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New run 61
Right arm at 64.60 mm
Left arm IN at 36.54 mm |
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Mon Jun 17 16:26:00 2024, JM, RSS, CB, Run 89 19x
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17:20
(Run 87 Junk and Run 88 does not exist)
Beam charge state set to 5+. Energy is ~1.06 MeV/u |