Difference between revisions of "September 7, 2011"
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| Line 67: | Line 67: | ||
! scope="col" width="50" | Beam | ! scope="col" width="50" | Beam | ||
! scope="col" width="50" | Dump magnet | ! scope="col" width="50" | Dump magnet | ||
| − | ! scope="col" width=" | + | ! scope="col" width="70" | Collimator |
! scope="col" width="50" | Radiator | ! scope="col" width="50" | Radiator | ||
! scope="col" width="50" | Threshold | ! scope="col" width="50" | Threshold | ||
Revision as of 21:26, 7 September 2011
Wednesday Run Plan
- Tune up beam
- During this time, as much as possible tune up daq timing
- Kicker magnet calibration with viewscreen
- Pair spectrometer checkout/debugging
This should include setting thresholds, studying rates with air converter, looking at rates with photon hole open
versus blocked, ...
- Check detector rates with D2O. See if we can get a good time of flight spectrum.
Kicker magnet calibration with viewscreen
Pair-spectrometer threshold calibration with beam
By using analog counter. Beam On. Dump out. Collimator Open. Radiator in (10 um Al).
By using analog counter. Beam On. Dump out. Collimator Open. Radiator in (10 um Al).
was not done
By using TDC to count PS pulses (10,000 beam pulses). Beam On. Dump in. Collimator Open. Radiator in (10 um Al).
- upstream PS: 150 mV threshold, 545 cnts/10,000 beam pulses
- downstream PS: 150 mV threshold, 476 cnts/10,000 beam pulses
By using TDC to count PS pulses (10,000 beam pulses). Beam On. Dump in. Collimator Open. Radiator out (10 um Al).
- upstream PS: 150 mV threshold, 74 cnts/10,000 beam pulses.
- downstream PS: 150 mV threshold, 101 cnts/10,000 beam pulses
There are effect from radiator in/out, but not so much as wanted.
By using TDC to count PS pulses (10,000 beam pulses). Beam On. Dump in. Collimator blocked (see lab log books). Radiator in (10 um Al).
- upstream PS: 150 mV threshold, 19 cnts/10,000 beam pulses
- downstream PS: 150 mV threshold, 18 cnts/10,000 beam pulses
(19/545 -> about 96.5% of beam is coming trough collimator!)
By using TDC to count PS pulses (10,000 beam pulses). Beam On. Dump in. Collimator blocked (see lab log books). Radiator out (10 um Al).
- downstream PS: 150 mV threshold, 20 cnts/10,000 beam pulses.
About the same as previous, good
By using TDC to count PS pulses (10,000 beam pulses). Beam Blocked. Dump in. Collimator blocked (see lab log books). Radiator out (10 um Al).
- downstream PS: 150 mV threshold, 0 cnts/10,000 beam pulses.
Summary of counting with TDC (10k beam pulses) for different beam line configuration. -150 mV threshold
| # | PS detector | Beam | Dump magnet | Collimator | Radiator | Threshold | Counts |
|---|---|---|---|---|---|---|---|
| 1 | upstream(down...) | On | In | Open | In | -150 mV | 545(476) |
| 5 | upstream(down...) | On | In | Open | Out | -150 mV | 74(101) |
| 6 | upstream(down...) | On | In | Upstream blocked w/ 2" Al | Out | -150 mV | 43(*) |
| 10 | upstream(down...) | On | In | Upstream blocked w/ 2" Al | In | -150 mV | 191(*) |
| 11 | upstream(down...) | On | In | Upstream blocked w/ 2" Al | Completely out | -150 mV | 65(*) |
| 11 | upstream(down...) | On | In | Upstream blocked w/ 2" Grafite | Completely out | -150 mV | 65(*) |
| 7 | upstream(down...) | On | In | Upstream blocked w/ 4" Al | Out | -150 mV | 41(*) |
| 8 | upstream(down...) | On | In | Upstream blocked w/ 4" Al | Completely Out | -150 mV | 30/34(*) |
| 9 | upstream(down...) | On | In | Upstream blocked w/ 4" Al | In | -150 mV | 159/(*) |
| 2 | upstream(down...) | On | In | Blocked | In | -150 mV | 19(18) |
| 3 | upstream(down...) | On | In | Blocked | Out | -150 mV | *(20) |
| 4 | upstream(down...) | Blocked | In | Blocked | Out | -150 mV | *(0) |
about meaning of the different adjectives (like completely) see the log books