 Fri Mar 3 20:50:31 2023, IK, MP, GJ, Other, , Data analysis, Ge spectra 
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Ge rates increasing, similar to what it was 24h before. Asking to decrease beam intensity by a factor of 2.
Attached Ge spectra before decreasing.
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Fri Mar 3 19:41:27 2023, IK, Problems, , Hardware, Beamdump readout issue Vol.2.
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Issue described in #61 continues to persist.
Beam stopped from 19:20 to 19:32, run 36 ongoing; MP, GJ, BS entering the experimental hall.
They changed the position of the grounding point on the chamber, moving it downstream after a fitting/joining part (A to B on the attached |
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Fri Mar 3 17:52:41 2023, IK, Problem Fixed, , Hardware, Beamdump readout issue - solved
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Current readout issues from beamdump. Beam stopped from 17:46-17:52, run 36 ongoing.
MP & GJ checking the grounding and connection the beamdump readout. No visible issue found in the exp hall, but copper grounding wire
was tightened, which seemingly resolved the issue (stability of beamdump readout). |
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Fri Mar 3 16:47:29 2023, IK, Runs, , General, Run 36 started
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Run 36 Started
New Beam energy is 150 MeV
The beam dumb currennt is 2.5 enA. |
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Fri Mar 3 15:04:33 2023, KWL, Other, , General, run 35 stopped
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| Run 35 stopped. An attempt to check if we can get 5 MeV higher beam energy. |
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Fri Mar 3 14:22:12 2023, IP, Runs, , General,
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the beam comes back. The run 35 is still going.
plunger run # 257 |
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Fri Mar 3 13:54:41 2023, IP. KWL, Runs, , General, beam energy measurement
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beam stop due to the beam energy measurement
The beam energy: ~145 MeV |
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Fri Mar 3 13:43:56 2023, IP. KWL, Runs, , , 511 annihilation and 279 Au lines in Ge rings
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The counting rate in 511 keV line for sum of the Ge detectors placed at 101, 117 and 143 degrees (with approved ACS). The largest intensity is visible
for Ge at 143 degrees, lowest for 101 deg.
=============================== RING 101 |
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Fri Mar 3 12:11:24 2023, IP, Runs, , General,
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| the beam comes back. |
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Fri Mar 3 11:48:29 2023, IP, Runs, , General, beam stopped
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| The beam is gone. |
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Fri Mar 3 11:37:25 2023, IP, Runs, , General,
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plunger run # 230
Beam dump 1.2 enA (given by operators) * 7 (following entry ID#39) = 8.4 enA
Collimator 0.6 enA |
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Fri Mar 3 10:21:18 2023, IP. KWL, Runs, , General, beam intensity back to 1.25 enA at the beam dump
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| we increased beam intensity to 1.25 enA (readout at the beam dump) |
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Fri Mar 3 10:09:20 2023, IP. KWL, Runs, , General, beam intensity decreased to 0.3 enA (at beam dump) on our request
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// we noticed yesterday that GE at 143 degrees counts more than those placed at 117 and 101. The 511 keV line (+ background) is much more pronounced
for Ge at 143 degrees. To investigate this issue we decreased the beam intensity to 0.3 enA ( value given by operators at the beam dump ).
Conclusion - decrease of the beam intensity does not explain above observations (se attached figs) |
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Fri Mar 3 09:30:15 2023, IP. KWL, Runs, , General,
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plunger run # 208
Beam dump 0.75 enA (given by operators) * 7 (following entry ID#39) = 5.25 enA
Collimator 0.75 enA |
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Fri Mar 3 08:20:13 2023, KWL, Runs, , General,
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plunger run # 196
Beam dump 1 enA (given by operators) * 7 (following entry ID#39) = 7 enA
Collimator 0.75 enA |
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Fri Mar 3 07:32:28 2023, OST, Runs, , General,
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plunger run # 188
Beam dump 2.5 enA
Collimator 0.8 enA |
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Fri Mar 3 06:24:03 2023, OST, Runs, , General,
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plunger run # 178
Beam dump 2.5 enA
Collimator 0.9 enA |
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Fri Mar 3 05:18:35 2023, OST, Runs, , General,
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plunger run # 167
Beam dump 2.5 enA |
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Fri Mar 3 04:15:32 2023, mgb, Runs, , General,
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plunger run # 157
Beam dump 2.5 enA |
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Fri Mar 3 03:19:34 2023, mgb, Runs, , General,
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plunger run # 147
Beam dump 2.5 enA |
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