TOF Emittance Emittance measurements with the TOFs Mark Rayner 4 December 2008

TOF Emittance G4MICE reconstruction of the beam line detectors TOF 0 & 1 –“PMT pulse time and size”-up reconstruction exists 1.Locate hits in PMTs and apply calibration 2.Decide which slabs were hit 3.Decide where the particle penetrated 4.Guess the trajectory –Cabling exists But should be moved so top-to-bottom recon works –Currently sorting this out –Calibration required Cable length –Next on my list Time walk – FADC-TDC correlation not understood –Not necessary for emittance measurement –Angle reconstruction exists Verified by MC simulations Geneva 1 & 2 –Above TOF work will allow the same top-to-bottom reconstruction with little extra work Fermilab 1 & 2 –Data not yet accessible to G4MICE –Significant effort required TofSlabHits TofSpacePoints TofDigits TofTracks Simulation Digitization TofDigits KEK VME ADC KEK VME TDC RAL VME FADC RAL VME TDC

TOF Emittance Error on x’ [radians] Amplitude [mm] Total error Due to Cherenkov Due to position error Due to timing error Due to tracking error Options for the emittance measurement g 07 [T/m] T/m g 09 –g 08 Use currently installed detectors –Position from Fermilab beam monitors Work required to read in data to G4MICE –Momentum from Geneva counters Current TOF work would allow this without difficulty –Data already taken (8 November 2008, Run 783) –Potentially the best measurement Absence of Cherenkov scattering and distributed energy loss outweighs time resolution Use TOF 0 and TOF 1 –Position and momentum from TOF 0 and TOF 1 –Currently working top-to-bottom reconstruction –Quadrupole currents already selected –Monte Carlo simulations already performed –The easiest measurement Use TOF 0 – Fermilab 1 – Quadrupoles and Cherenkov – Fermilab 2 – TOF 1 –Effectively eliminate position resolution –Work required to use Fermilab 1 and 2