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Understanding the BL m.apollonio - IC / m.rayner - Oxford

Understanding the BL m.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

ivan-hartman
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Understanding the BL m.apollonio - IC / m.rayner - Oxford

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  1. 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 MICE Video Conference

  2. sy 4 cm TOF0 25.00 kG sx MICE Video Conference

  3. sy 4 cm TOF0 28.00 kG sx MICE Video Conference

  4. sy 4 cm TOF0 NB: the beam profile strongly depends on the initial conditions, here arbitrary! So this is just a general behaviour ... 31.00 kG sx MICE Video Conference

  5. sy 4 cm TOF0 32.00 kG sx MICE Video Conference

  6. sy 4 cm TOF0 34.00 kG sx MICE Video Conference

  7. Back to reality: a TofMonitor Intermezzo(elimination of spurious TDC Hits) TOO MANY HITS: investageted yesterday by Mark MICE Video Conference

  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 221 25ps TDC channels the particle which causes the trigger rapidly causes hits in both TOFs O(30ns) ~8m at c a particular PMT cut Elimination of spurious TOF TDC hits

  9. failed TDC cut TofMonitor now implies TOF DAQ/recon is sensible TOF0 plane 0 TOF0 plane 1 TOF0 space points not the particle which triggered TOF1 plane 0 TOF1 plane 1 TOF1 space points • red=blue • excellent TOF operation Elimination of spurious TOF TDC hits

  10. G4BeamLand & TofMonitor comparison... TOF-US TOF-DS TOF-MID MICE Video Conference

  11. TOF0 – US ALL Pions Protons Muons P –250 MeV/c p –centered at 330 MeV/c MICE Video Conference

  12. From now on TOF0 – MID TOF1 – US MICE Video Conference

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  30. G4BL DATA SIG Y SIG X MICE Video Conference

  31. 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) MICE Video Conference

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