SciFi Tracker Beam Test outline The performance TOF which is needed to Beam Test & Guide7 Simulation TOF calculation TOF ACC estimation test for Beam Test.

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Presentation transcript:

SciFi Tracker Beam Test outline The performance TOF which is needed to Beam Test & Guide7 Simulation TOF calculation TOF ACC estimation test for Beam Atsushi Horikoshi, Osaka-U

phase Ⅰ :estimate of basic SciFi tracker performance particle tracking w/magnetic field, detection efficiency, high beam rate performance phase Ⅱ :detailed test low momentum μ(300 ～ 400MeV/c) detection, reconstruction of emittance ’ 05 Beam Test : SciFi Tracker test schedule

Phase Ⅰ setup （ Apr 2005, KEK pi2 ） 5x5 hodoscpe

to estimate longitudinalμmomentum, SciFi tracker is put in magnetic field magnetic field ： superconducting magnet, Super-JACEE(1T) L Phase Ⅰ： particle tracking in magnetic field

Phase Ⅱ setup (Oct 2005, KEK pi2) ・ μmomentum ： 300~400MeV /c ・ low beam rate ・ but, defuser makes many condition of beam

TOF timing resolution to devide pi & μ π-μ sigma=50ps ・ ~700MeV/c PID>3σ ( >99.7% ) ・ 1GeV /c PID=1.65σ ( >95% ) Phase Ⅰ (high σ<50ps needed ! π ２ beamline ： μ,e,π,p ⇒ we want to select μ momentum(MeV/c) TDC(ns)

shape of TOF unit : mm ・ very long light guide ⇒ to avoide strong magnetic field ・ PMT:R6504S fine mesh PMT (used by BESS, 19DY, strong resistance of magnetic field)

S-JACEE side view magnetic PMT ３０００ GAUSS TOF shape requirement

magnetic PMT ⇒ PMT direction is parrarel to magnetic field

TOF shape requirement magenta : scintillator length : 40cm long light guide : 50cm front view : isotropical position ⇒ same magnetic field ・ long light guide : lower resolution (60ps) near to SciFi tracker It is easy to make isotropical poistion ・ short light guide : high resolution (50ps per counter) but, design of light guide is very difficult we selected long TOF

guide7 Simulation timing resolution of counter 64.59ps per PMT If PMT resolution is same, σ(counter)=1/1.41σ(PMT) ⇒ 45.80ps per counter

TOF & ACC estimation testπ ２ Beam Line(KEK) ’ 05 2/1~2/7 done define beam position of TOF ・ coincidence with ref1 & ref2 ・ coincidence with ref1 & cube ref 1 & ref 2 : 100mm x 5mm(t)

TOF construction scintillator & light guide is wrapped by Aluminized Mylar(50μmthin) scintillator EJ230(BC420) EJ204(BC404)

ACC construction 10PMTs used acc index : 1.03

beamline setup right: ref1&ref2 down:beamline setup

estimation of the resolution(preliminary) TOF1rt-TOF1lt ⇒ effect of external counter of sigma is center of counter σ=1.662count 28.8ps/count ⇒ 47.8ps Guide 7 Simulation 45.8ps

measurement of resolution(preliminary) all plots are time walk calibrated

position dependence of resolution (preliminary) good resolution~ pos

summary We performed TOF & ACC estimate pi2 beam line, in feb1st~feb7th TOF timing resolution is sufficiently to distinguish pion calculated resolution is ~ 50ps