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--- beamtimes:2018_jan [2018/01/31 16:26] – [Nitrogen] admin
+++ beamtimes:2018_jan [2022/01/14 18:44] (current) – external edit 127.0.0.1
@@ Line 10: / Line 10: @@
 The bottles are placed in the detector lab in the A1 ground floor.
-^Pres /bar ^ date ^
+^ Pres /bar  ^ date          ^
-| 105 | 31.01. 15:55 |
+| 105        | 31.01. 15:55  |
+| 75         | 1.2. 10:00    |
+| 50         | 2.2. 00:01    |
+| 48         | 2.2. 04:00    |
+| 175        | 4.6. 17:10    |
+| 150        | 5.6. 13:00    |
+| 100        | 6.6. 20:00    |
+| 100        | 6.6. 22:15    |
+| 85         | 7.6. 05:10    |
+| 65         | 7.6. 15:45    |
+| 55         | 7.6.  20:00   |
+| 40         | 8.6.  01:20   |
+| 35         | 8.6.  04:05   |
+| 29         | 8.6.  06:45   |
+| 20         | 8.6. 10:45    |
+| new        | bottle        |
+| 210        | 8.6. 13:45    |
 ==== General Overview ====
@@ Line 18: / Line 34: @@
 ===1 Get beam===
-start with smallest current (1 nA)
+  - start with smallest current (1 nA)
-if event rate too high: install picoamperemeter
+  - if event rate too high: install picoamperemeter
 ===2 Preparation with C, 1.5 GeV, smallest angle===
 For each setting:
-measure rates
+  * measure rates
-take spectrum (look at gamma and e spectra)
+  * take spectrum (look at gamma and e spectra)
 Steps:
-set up coincidence between EMC and scintillator
+  - set up coincidence between EMC and scintillator
-increase beam current up to 100 nA in various steps -> find appropriate current value
+  - increase beam current up to 100 nA in various steps -> find appropriate current value
-change thresholds
+  - change thresholds
-move prototype with the xy table
+  - move prototype with the xy table
-set up coincidence with spectrometer A
+  - set up coincidence with spectrometer A
 ===3 HV and energy calibration (plastic target)===
-recognise one or more energy peaks
+  - recognise one or more energy peaks
-elastic on C (nucleus)
+    * elastic on C (nucleus)
-elastic on H
+    * elastic on H
-inelastic on H in coinc. with spec. A
+    * inelastic on H in coinc. with spec. A
-adjust HV
+  - adjust HV
-change angle or spec. A settings for changing the peak energy
+  - change angle or spec. A settings for changing the peak energy
 ===4 Total rate and global spectrum with Ta===
-vary beam current -> find appropriate value
+  - vary beam current -> find appropriate value
-threshold scan at the smallest angle
+  - threshold scan at the smallest angle
-vary scattering angles
+  - vary scattering angles
 ===5 Identify pi0 events (measuring gammas)===
-use second scintillator at different angles for electrons
+  - use second scintillator at different angles for electrons
-set up triple coincidence
+  - set up triple coincidence
-change spec. A polarity to measure electrons
+  - change spec. A polarity to measure electrons
-set up coincidence with spec. A
+  - set up coincidence with spec. A
-measure gamma spectrum changing angle and spectrometer settings (measure end-point of the gamma spectrum)
+  - measure gamma spectrum changing angle and spectrometer settings (measure end-point of the gamma spectrum)
-try different targets C,CH2,Ta
+  - try different targets C,CH2,Ta
 ===6 Measurements with 855 MeV===
- change beam energy (until Friday noon!)
+  - change beam energy (until Friday noon!)
-increase beam current to appropriate value
+  - increase beam current to appropriate value
-repeat measurements for energy calibration
+  - repeat measurements for energy calibration
-repeat measurements for total rate
+  - repeat measurements for total rate
-repeat measurements for pi0 event identification
+  - repeat measurements for pi0 event identification