1. MICE tracker meeting 2005.3 Prototype TOF test for tracker test @ KEK Osaka university Atsushi Horikoshi

2. contents magnetic field of Super Jacee shape of TOF timing resolution test @KEK-PS pi2 Analysis calibration for Phase Ⅱ

3. Phase Ⅱ setup (KEK-PS pi2) perpose measurement of momentum emittance reconstruction

4. super conducting magnet Super JACEE, 1T 2.1m φ ８５０ mm vessel for ballon experiment front veiw side view

5. requirement of TOF π/μ PID 3σresolution momentum scan measurement of absolute value resolution of momentum keep high timing resolution in magnetic field

6. π/μPID momentum of Phase Ⅱ 300 ～ 600Mev/c timing resolution for 3σPID upstream 50ps down strean 50ps 3σPID

7. momentum timing resolution upstream 50ps downstream 50ps momentum resolution p<600MeV Δp/p<5.6% 7 0 0.25 0.6

8. 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

9. magnetic field 1500Gauss,almost parallel satisfies the condition コイル

10. effect of the ground of iron @PMT 1T thanks for Arimoto san TOSCA

11. magnetic field of PMT the effect of iron is small iron y 0 geometry magnetic filed first second third

12. prototype test （ KEK-PS pi2,2005 Feb ） guide7 simulation timing resolution47ps setup of beamline

13. analysis σ(tof- ref1) =64ps ⇒ σ （ tof ） =49ps

14. position scan,timing resolution timing resolution [ ｐｓ ] ● ： PMTR 〇： PMTL under ● weighted mean distance from center [ ｃｍ ] 9090 timing resolution is 50ps @ all position 5050 0 020 satisfied condition of PID

15. position scan 2, npe npe 600~800 very high npe attenuation length 118cm

16. effective velocity Veff=15.3cm/ns not good linearity

17. calibration for Phase Ⅱ we can ’ t determine hit position from external tracker in Phase Ⅱ 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

18. timing resolution using tdc mean position is calculated from tdc, tofrt-toflt timing resoluiton 50~57ps 48~52ps (using ref1 position) position spread -0.5~0.4cm

19. summary timing resolution 50ps @ all position npe=600~800 Veff=15.3cm/ns calibration using tdc mean 53ps @ all position, stability is not good