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Preliminary result of the target polarization 2004

Preliminary result of the target polarization 2004. Kaori Kondo COMPASS target team. Polarization measurement 2004. downstream cell. upstream cell. 120. outer coil. inner coil (coil 6). Coil 6 does not work. 60 mm. f 15 mm. f 30 mm. NMR signals. magnetic field direction.

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Preliminary result of the target polarization 2004

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  1. Preliminary resultof the target polarization2004 Kaori Kondo COMPASS target team

  2. Polarization measurement 2004 downstream cell upstream cell 120 outer coil inner coil (coil 6) Coil 6 does not work. 60 mm f 15 mm f 30 mm

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

  4. building up polarization typical polarization buildup polarization (%) 1 day : +42% & -40% 2 days: +47% & -46% 3 days: +50% & -48% 5 days: +52% & -49% day relaxation time at 60 mK 2.50 T (normal frozen mode) 15000 hours at 60 mK 0.42 T (transverse mode) 1400 hours lost 0.7 % in 2 weeks lost 2~3 % in 5 days

  5. upstream downstream signal area unit signal area unit 1/T 1/T TE calibration We had very good calibration with 5 temperature points. Errors from TE calibration can be about 1%

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

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

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