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Prototype TOF test for tracker test @ KEK

Prototype TOF test for tracker test @ KEK. Osaka university Atsushi 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.

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Prototype TOF test for tracker test @ KEK

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

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

  3. PhaseⅡsetup (KEK-PS pi2) • perpose • measurement of momentum • emittance reconstruction

  4. super conducting magnetSuper JACEE , 1T vessel for ballon experiment side view φ８５０mm 2.1m front veiw

  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 thanks for Arimoto san 1T TOSCA

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

  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 90 ●：PMTR 〇：PMTL under　● weighted mean timing resolution [ｐｓ] 50 timing resolution is 50ps @ all position satisfied condition of PID distance from center [ｃｍ] 0 20 0 20

  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 PhaseⅡ • we can’t determine hit position from external 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

  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

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