14/1/20097 january 2009mice cm23 - harbin - beamline session1 mice beamloss data adam dobbs
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14/1/20097 January 2009 MICE CM23 - Harbin - Beamline Session 2
MICE Beam Loss Studies Overview
• Purpose – understand beam loss in ISIS due to MICE target
• Analogue ISIS beam loss signals (total ring loss, total sector 7 and 8 loss) readout by a MICE DAQ
• ISIS beam intensity, position and MICE target position signals also recorded by the DAQ
• DAQ operates at 100 kHz
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14/1/20097 January 2009 MICE CM23 - Harbin - Beamline Session 4
Averaged Data
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MICE beamloss
ISIS at normal rep rate, 5 spills shown, MICE target dip on first spill
14/1/20097 January 2009 MICE CM23 - Harbin - Beamline Session 5
Averaged Data – reduced rep rate
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ISIS at reduced rep rate => No spills without target present so cannot subtract background!
14/1/20097 January 2009 MICE CM23 - Harbin - Beamline Session 6
Background-subtracted Data (not averaged)
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-used to make lookup table of target depth and beamloss for every actuation
14/1/20097 January 2009 MICE CM23 - Harbin - Beamline Session 7
Averaged and BG-subtracted
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Data set 15-12-08_07
14/1/20097 January 2009 MICE CM23 - Harbin - Beamline Session 8
Averaged and BG-subtracted
Electronics artefactPossible losses from target scraping beam at injection
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14/1/20097 January 2009 MICE CM23 - Harbin - Beamline Session 9
Target Depth Vs Time
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Data set 19-12-08_00-03
- maximum target depth of each actuation over period of a run (of order hours). Below is for the evening of the target failure on 19-12-08
14/1/20097 January 2009 MICE CM23 - Harbin - Beamline Session 10
Data set 15-12-08_00-01
Target Position Vs Beamloss: actual-from a typical run
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Depth(mm) =Grad*Depth(V)+OffGrad = 10.1737Off= 22.5089
1V -> 32.68mm,1.25V -> 35.23mm
14/1/20097 January 2009 MICE CM23 - Harbin - Beamline Session 118 January 2009 MICE Target Meeting 11
Data set 19-12-08_00-03
Target Position Vs Beamloss: actual-from a night of target failure on 19-12-08. Severely reduced beamloss
14/1/20097 January 2009 MICE CM23 - Harbin - Beamline Session 12
Zoomed
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Data set 19-12-08_00-03
Quantisation of data for target position – note scale