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Central Detector System Specifications

Central Detector System Specifications. Takeyasu Ito Los Alamos National Laboratory EDM Collaboration Meeting May 25, 2006 Oak Ridge, TN. Central Detector System Specifications. Question. How well should E and B be aligned? What should the uniformity of E be?.

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Central Detector System Specifications

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  1. Central Detector System Specifications Takeyasu Ito Los Alamos National Laboratory EDM Collaboration Meeting May 25, 2006 Oak Ridge, TN

  2. Central Detector System Specifications

  3. Question • How well should E and B be aligned? • What should the uniformity of E be?

  4. Requirements from vxE effects • Motional field • False EDM due to motional field • Example • EB=1º, v=10-4 m/s gives dsys=10-28 e cm

  5. Mechanisms for nonzero <v> • Non-uniform coating • Non-uniform UCN loss • Non-uniform depolarization of UCN and/or 3He • Energy dependent loss rate of UCN + gravity • Holes on the cell wall

  6. Non-uniform coating

  7. Non-uniform coating — cont’d • We need for if • In order to guarantee , we need • Therefore we need • The same argument applies also to depolarization, which also applies to 3He atoms. • Note: this effect only appears in experiments where the precession is continuously monitored. Note: 3He mean free path at 0.3K is ~ 8 cm.

  8. Energy dependent loss rate + gravity g

  9. Energy dependent loss rate + gravity — cont’d h = 10 cm V = 165 neV

  10. Holes on the cell wall 40m gap for a 1cm diameter valve on a 500cm2 wall

  11. Summary Additional requirements from the liner vxB effect • E and B be parallel to 1o • Non-uniformity of the coating be such that • 10-5 (neutron loss/bounce) • <10-5 (3He depolarization/bounce)

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