mice tracker meeting 2005.3 prototype tof test for tracker test @ kek osaka university atsushi...
Post on 22-Dec-2015
217 views
TRANSCRIPT
MICE tracker meeting 2005.3
Prototype TOF test for tracker test @ KEK
Osaka universityAtsushi Horikoshi
contents magnetic field of Super Jacee shape of TOF timing resolution test @KEK-PS pi2 Analysis calibration for PhaseⅡ
PhaseⅡsetup (KEK-PS pi2)
perpose measurement of momentum emittance reconstruction
super conducting magnetSuper JACEE , 1T
2.1m
φ850mm
vessel for ballonexperiment
front veiw
side view
requirement of TOF π/μ PID
3σresolution momentum scan
measurement of absolute value resolution of momentum
keep high timing resolution in magnetic field
π/μPID momentum of Phase Ⅱ
300 ~ 600Mev/c timing resolution f
or 3σPID upstream 50ps down strean 50ps
3σPID
momentum timing resolution
upstream 50ps downstream 50ps
momentum resolution p<600MeV Δp/p<5.6%
7
00.25 0.6
shape of TOF to avoid reduction of timing resolution
fine mesh PMT (used BESS experiment) R6504S (hamamatsu, 19DY)
PMT is parallel to magnetic field long light guide
magnetic field 1500Gauss ,almost parallel satisfies the condition
コイル
effect of the ground of iron@PMT
1T
thanks for Arimoto san
TOSCA
magnetic field of PMT the effect of iron
is small
iron
y
0
geometry
magnetic filed first second third
prototype test( KEK-PS pi2,2005 Feb)
guide7 simulation timing resolution47ps
setup of beamline
analysis
ref2)}(ref1σ
ref2)(tofσ
ref1)(tof{σ
(tof)σ
2
2
2
2
1
2
σ(tof-ref1) =64ps
⇒σ ( tof ) =49ps
position scan,timing resolution
timing resolution[ ps ]
●: PMTR〇: PMTL
under ●weightedmean
distance from center[ cm ]
90
timing resolution is 50ps @ all position
50
0
0 2020
satisfied condition of PID
position scan 2 , npe npe
600~800 very high npe
attenuation length 118cm
effective velocity
Veff=15.3cm/ns not good linearity
calibration for PhaseⅡ we can’t determine hit position from ext
ernal tracker in PhaseⅡ calculation from tdc mean Veff=15.3cm/ns
t(hitR)=tr-(20-z)/Veff t(hitL)=tl-(20-z)/Veff z=(tr-tl)xVeff/2
timing resolution using tdc mean
position is calculated from tdc , tofrt-toflt
timing resoluiton 50~57ps 48~52ps (using ref1 positio
n) position spread
-0.5~0.4cm
summary timing resolution
50ps @ all position npe=600~800 Veff=15.3cm/ns
calibration using tdc mean 53ps @ all position , stability is not good