beam studies december 2014 runs: 7820 – 7860 december 27, 2014
TRANSCRIPT
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Beam StudiesDecember 2014
Runs: 7820 – 7860
December 27, 2014
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Outline
• FADC and TDC Data Synchronization:– Mott_SemiInt Mode: good (only one run was taken – 7860)– Mott_Sample Mode: TDC data is off by one event (except first
four runs: 7820, 7821, 7822, and 7823*)
* After Run 7823, TDC stop signal offset (NIM740) was adjusted before going to DISC (NIM708) but nothing obvious on scope
• Beam Rep = 31 MHz (C Laser)• Beam Rep = 62 MHz (C Laser)• Beam Rep = 499 MHz (A Laser)• Background
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Mott_SemiInt – Run 7860
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Mott_Sample – Run 7673
TDC Shift =0
TDC Shift =1
TDC Shift =2
Run from May 2014
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Extra TDC stripes because four
detectors have slightly different
time offsets
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Mott_Sample – Run 7859 – 31 MHz
TDC Shift =0
TDC Shift =1
TDC Shift =2
TDC is off by one event
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Run 7858 – Thru Hole TDC Shift =1
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Run 7824 – 62 MHz TDC Shift =1
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Run 7839 – 499 MHz TDC Shift =1
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Solution
• B. Moffit thinks it's possible that loss of synchronization was actually coming from fadc250, instead of TDC.
• With prescription that was in current readout-lists may have left data on fadc250 that was not cleared before next run.
• This would explain why changing configuration, or resetting and downloading again would clear it up.
• Added a faClear(..) into start-of-run to see if this should help.
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Background
• Rep Rate = 499 MHz (A Laser):– Runs: 7821, 7822, 7833-7838 → yes background– Runs: 7839-7850, 7852-7858 → no background
• Rep Rate = 62 MHz (C Laser):– Runs: 7820, 7823-7829 → yes background– Run: 7824* → no background * C Laser, amp=2.0W, A-slit = 60mm
• Rep Rate = 31 MHz (C Laser):– Runs: 7831, 7832, 7833 → yes background– Runs: 7851, 7858, 7859 → no background
All runs before 7839
(except for Run 7824) have background
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BPM0L02 x-positionBefore Run
7839, BPM0L02X was changed from
1.5 to -4.5 mm
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Beam Current
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Mott Events
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Detector Events
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E Events
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dE Events
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Run 7838 – 499 MHz TDC Shift =1
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Run 7830 – 31 MHz TDC Shift =1
Background events from beam scraping apertures upstream of target
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Run 7825 – 62 MHz TDC Shift =1