Preliminary result of the target polarization 2004 Kaori Kondo COMPASS target team.

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Presentation transcript:

Preliminary result of the target polarization 2004 Kaori Kondo COMPASS target team

upstream cell downstream cell Polarization measurement  30 mm 60 mm  15 mm outer coil inner coil (coil 6) Coil 6 does not work.

magnetic field direction NMR signals negative polarization positive polarization (spin anti-parallel to the field) (spin parallel to the field) always monitored!

building up polarization relaxation time day polarization (%) typical polarization buildup 1 day : +42% & -40% 2 days: +47% & -46% 3 days: +50% & -48% 5 days: +52% & -49% at 60 mK 2.50 T (normal frozen mode) hours at 60 mK 0.42 T (transverse mode) 1400 hours lost 0.7 % in 2 weeks lost 2~3 % in 5 days

TE calibration Period Temperature (K) 5 May ~ 7 May May ~ 9 May May ~ 12 May June ~ 12 June June ~ 14 June /T signal area unit upstreamdownstream We had very good calibration with 5 temperature points. Errors from TE calibration can be about 1%

TE calibration relaxation time measurement 2 Aug. cooling water pressure 20 Aug. cooling water stop transverse thanks to Isabel upstream downstream

H E L P ! ! We would like target shift crews 21 Sept. ~ 4 Oct. Experienced people are welcomed. Still 13 shifts are not occupied. Have a look on: -> shiftlist. Contact with Fabrice Gautheron for volunteering!