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

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9/24/2009 16MICE Video Conference

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9/24/2009 21MICE Video Conference

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9/24/2009 24MICE Video Conference

9/24/2009 25MICE Video Conference

9/24/2009 26MICE Video Conference

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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