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Understanding the BLm.apollonio - IC / m.rayner - Oxford
• DKSolenoid Scan: – NB, Dksol is definitely in the beamline now ...
• 19 runs on Wed 19 (1037 – 1054)– DKSol currents varied from 374A to775A in steps of ~20A– “PION” optics, Ptgt=336.85 MeV/c – Central current: 550A = 3.16T
• Rationale: checking the modulation in sigx-y produced by a continuous variation of DKSol current
• Compare with Simulation • Use TOF0/1 as z-stations verify DAQ/Data quality
– TofMonitor as x-y visual display of the look of the beam
9/24/2009 1MICE Video Conference
25.00 kG
y
x
4 cm TOF0
9/24/2009 2MICE Video Conference
28.00 kG
y
x
4 cm TOF0
9/24/2009 3MICE Video Conference
31.00 kG
y
x
4 cm TOF0
9/24/2009 4MICE Video Conference
NB: the beam profile strongly dependson the initial conditions, here arbitrary!So this is just a general behaviour ...
32.00 kG
y
x
4 cm TOF0
9/24/2009 5MICE Video Conference
y
x
4 cm TOF0
34.00 kG9/24/2009 6MICE Video Conference
9/24/2009 7MICE Video Conference
Back to reality: a TofMonitor Intermezzo
(elimination of spurious TDC Hits)
TOO MANY HITS: investageted yesterday by Mark
VC 24 September 09 Elimination of spurious TOF TDC hits 8
TDC – trigger distribution● Dead time & acquisition time
■ O(microseconds) following trigger
● Higher rate than last year■ Triggering particle
► Peaked (TDC – trigger TDC)
■ Spurious particles other than the triggering particle also register hits
► Uniform distribution
● Cut on TDC – trigger TDC
the particle which causesthe trigger rapidly causes
hits in both TOFs
a particular PMT
221 25ps TDC channels
O(30ns)~8m at c
cut
VC 24 September 09 Elimination of spurious TOF TDC hits 9
TofMonitor now implies TOF DAQ/recon is sensible
not the particle which triggered
red=blueexcellent
TOF operation
TOF0 plane 0 TOF0 plane 1
TOF1 plane 0 TOF1 plane 1
TOF0 space points
TOF1 space points
failed TDC cut
9/24/2009 10MICE Video Conference
G4BeamLand & TofMonitor comparison...
TOF-US
TOF-MID
TOF-DS
9/24/2009 11MICE Video Conference
ALLPionsProtonsMuons
P –250 MeV/c
–centered at 330 MeV/c
TOF0 – US
9/24/2009 12MICE Video Conference
From now onTOF0 – MID
TOF1 – US
9/24/2009 13MICE Video Conference
9/24/2009 14MICE Video Conference
9/24/2009 15MICE Video Conference
9/24/2009 16MICE Video Conference
9/24/2009 17MICE Video Conference
9/24/2009 18MICE Video Conference
9/24/2009 19MICE Video Conference
9/24/2009 20MICE Video Conference
9/24/2009 21MICE Video Conference
9/24/2009 22MICE Video Conference
9/24/2009 23MICE Video Conference
9/24/2009 24MICE Video Conference
9/24/2009 25MICE Video Conference
9/24/2009 26MICE Video Conference
9/24/2009 27MICE Video Conference
9/24/2009 28MICE Video Conference
9/24/2009 29MICE Video Conference
9/24/2009 30MICE Video Conference
SIG Y SIG X
G4BL DATA
Summary & Future• DKSol Scan needs more investigation to understand
discrepancies– real composition of the beam
• PI-MU beamline optics was tried some weeks ago producing an excess of (most likely) protons– However data quality and trigger cond’s were not OK to
assess this
• we plan next to optimise pion capture/transport in the first triplet (dedicated run)
9/24/2009 MICE Video Conference 31