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Fixed, e768s, Mon Jul 22 16:54:33 2019, Marlène, Franck, François & Nicolas, BEAM, General, , Cheking beam transmission from G1 profiler to VAMOS
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Goal:
Estimate beam transmission from profiler to VAMOS (FP)
Method:
1. Beam intensity is reduced with the pepper pot 1/9 and by closing slits after the 15O target production and the accelerators so that the beam quality (emittance, etc...) is not affected.
2. VAMOS plate is removed to allow the direct beam detection
3. LiF (1.25 mg/cm2, number 1) is in position
Results:
1. beam intensity at G1 profiler ~ 4e4 pps
2. VAMOS FP ~ 2e4 pps
Discussion:
1. There is a factor of two loss between the profiler and VAMOS. Taken this factor into account in the g-ray yield estimate (see post ..) the numbers of 1297- and 1340-keV g-rays is in line with what is expected from cross-section calculation.
2. Loosing a factor of two means a substantial amount of 15O is implanted in the pipe/target frame/MUST2 masks. A dedicated AGATA activation measurement could be performed to cross-check this factor of two. |
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Fixed, e768s, Mon Jul 22 17:07:39 2019, Marlène, Franck, François & Nicolas, BEAM, General, , Profiler conditions for measuring beam intensity
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| We checked that the measured beam intensity (present case 1.5e7 pps) is independent on the voltage on the profiler. Values from 93 V up to 177 V gave similar results. |
Fixed, e768s, Mon Jul 22 17:54:49 2019, Christian and Jeremie, AGATA, General, LiF, Comparison EGamma 19Ne, Q8 vs Q9 
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1) Beam velocity from VAMOS for AGATA doppler correction. Beta is understandable for the three main charge states seen (with Q9 and Q10 as the transfer states, and centroid shifted higher for Q10 state, possibly because of reduced acceptance for the very high-lying states.
2) Entire doppler corrected gamma-ray spectrum. Blue is transfer (Q9), red is fusion evaporation (Q8). 1880 keV line only seen in fusion evaporation as expected, 13/2+ state.
3) Zoom at the region around 2.5 MeV. Note that |
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Fixed, , Mon Jul 22 19:13:45 2019, Kseniia, AGATA, General, , Current stats on 19Ne
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| Runs 112..125, still no joy... |
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Fixed, e768s, Mon Jul 22 19:34:16 2019, Didier & Franco, RUN, General, LiF, Beam intensity and profile check
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Fixed, e768s, Mon Jul 22 21:30:36 2019, Franco, OFFLINE, General, LiF, Identification in Mugast for Ne in VAMOS
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| Difference in identification in Mugast when gating on 19Ne and when gating on the two nearby isotopes (runs from 112 to 121). |
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Fixed, e768s, Mon Jul 22 23:17:00 2019, Didier & Franco, RUN, General, LiF, Screenshots run 126 @23h00 18x
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Fixed, e768s, Tue Jul 23 00:01:23 2019, Freddy, Jenn, BEAM, General, LiF, Beam intensity and profile check
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Fixed, e768s, Tue Jul 23 02:04:17 2019, Freddy, Jenn, OTHER, General, LiF, overnight summary (Monday 22 to Tuesday 23rd)
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Smooth counting at 1000 KHz in VAMOS (see scalers)
- 1h45 - resync of AGATA 13C |
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Fixed, e768s, Tue Jul 23 02:09:38 2019, Freddy, Jenn, OFFLINE, General, LiF, Ex-Egamma (update)
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| Ex Egamma for run 112 115 116 117 118 119 120 121 122 124 125 126(partial) |
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Fixed, e768s, Tue Jul 23 02:15:58 2019, Freddy, Jenn, ONLINE, General, LiF, Screenshots run 126 @2h00 20x
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Fixed, e768s, Tue Jul 23 04:31:34 2019, Jenn & Christian, BEAM, General, , Diamond Scaler screenshot
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Fixed, e768s, Tue Jul 23 04:34:03 2019, Jenn & Christian, BEAM, General, , Beam intensity and profile check
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VAMOS OR: ~1200
BEAM INTENSITY ~ 2E7 |
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Fixed, e768s, Tue Jul 23 06:49:54 2019, Jenn & Christian & Kseniia, BEAM, General, , Beam intensity and profile check
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VAMOS OR ~ 870
BEAM INTENSITY ~ 1.4E7 |
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Fixed, e768s, Tue Jul 23 09:03:07 2019, Kseniia, Gilbert, Yorick, BEAM, General, , Beam intensity and screenshots 25x
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The beam has been pretty stable since yesterday |
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Fixed, e768s, Tue Jul 23 11:02:54 2019, Kseniia, Gilbert, BEAM, General, , Beam profile
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Fixed, e768s, Tue Jul 23 12:00:25 2019, Christian, BEAM, General, LiF, Profiler and beam current scaling since 11;10
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| See also AGATA elog and run-log entry |
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Fixed, e768s, Tue Jul 23 13:11:36 2019, OttoRun, RUN, General, LiF, Run127
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*************************
Run : 127
*************************
Start at 2019-07-23 13:09:00.419349
Beam intensity: 1.5e7 pps
OR VAMOS ~ 1100 Hz
after check of beam intensity on target (factor of 2 in transmission with target)
Target: 1.25 mg/cm2 (nb 1) 7LiF
Triggers:
MUGAST (backward, MM, 90 deg)
VAMOS %100
BaF2 %100
Rates:
FAG: 87
MUGAST: 70
OR AGATA: 1100
OR VAMOS: 940
MG3 pedestal suppression between 0 and 6800
Shift of beam, retuning from PCP
Stop at 2019-07-23 13:17:22.129736
Stop comment: End of short run 127 |
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Fixed, e768s, Tue Jul 23 13:20:20 2019, mugast, RUN, General, N/A, Beam stop for canicule
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At 13.16 the beam was stopped due to the high temperature.
Bertrand is switching off the magnets of VAMOS. |
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Fixed, e768s, Tue Jul 23 14:33:03 2019, Marlène, Yorick, Faïrouz & Nicolas, BEAM, General, , Cheking beam transmission from G1 profiler to VAMOS
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Goal:
Estimate beam transmission from profiler to VAMOS (FP)
We question whether the factor of two found yesterday (VAMOS/Profiler ~ 0.5) could be due:
1. to an incorrect measurement of the beam intensity with the profiler
2. a charge state equilibration in the target (LISE++ calculation indicates 8+/7+ = 85%/15%)
Same conditions as yesterday:
1. Beam intensity is reduced with the pepper pot 1/9 and by closing slits after the 15O target production and the accelerators so that the beam quality (emittance, etc...) is not affected.
2. VAMOS plate is removed to allow the direct beam detection
Results:
We measure in VAMOS with the LiF target and with the target ladder totally removed. In the latter case, direct beam 15O(8+) is sent in VAMOS and no charge state effect enter into the game.
1. Beam intensity at G1 profiler ~ 6.5e4 pps
VAMOS (FP) + no target ~ 3.8e4 pps
2. Beam intensity at G1 profiler ~ 3.8e4 pps
VAMOS (FP) + thick LiF (nb 1) ~ 2.0e4 pps
Discussion:
We find the same results as yesterday, e.g. a factor of two attenuation between the profiler and VAMOS. If part of this loss would happen in the pipe/target/MUST2 mask, this should be observed in AGATA which is not the case. Could it be that the PPAC in VAMOS is not as efficient as announced at the beginning of the campaign (98%)? This must be checked when we get beam back later on.
Note:
While doing the above measurement, we observed a factor of 3 loss between profiler AR.Gaz13 and G1.Gaz31. Numbers follows:
L3.GAZ42 AR.GAZ13 G1.GAZ31
2.1e4 1.5e4 4.1e3
1.4e5 1.0e5 2.5e4
??? 1.8e5 6.5e4 |
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