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Field studies for 2 Tesla data

Field studies for 2 Tesla data. Magnetic field meeting, CERN Oct 19, 2006. V. Karimäki Helsinki Institute of Physics. Outline. study of Mapper alignment simple alignment correction comparison with Tosca summary. 2. Mapper arms and probes tilt effects.

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Field studies for 2 Tesla data

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  1. Field studies for 2 Tesla data Magnetic field meeting, CERN Oct 19, 2006 V. Karimäki Helsinki Institute of Physics

  2. Outline • study of Mapper alignment • simple alignment correction • comparison with Tosca • summary 2

  3. Mapper arms and probes tilt effects Tilt of arms from the plane normal to B: • causes Br and Bphi coupling to Bz • since Bz is large ans Br and Bphi are small, even small tilt causes large relative effect to Br/Bphi • the effect is sinusoidial as a function arms rotation Tilt of probes with respect to the arm: • causes a constant coupling to Bz (independent of phi) 3

  4. Correction formulas Br -> Br + [(ai + bj sin(f-fj)]Bz Bphi -> Bphi + [(am + bn sin(f-fn)]Bz - f is arm turning angle - a's are probe dependent - b's and f's are arm dependent 4

  5. Br vs phi at z=0 No alignment correction Mapper alignment correction 5

  6. Bphi vs phi at z=0 No alignment correction Mapper alignment correction 6

  7. Bz and Br vs z, r=0.092 m 7

  8. Bz and Br vs z, r=0.500 m 8

  9. Bz and Br vs z, r=0.908 m 9

  10. Bz and Br vs z, r=1.316 m 10

  11. Bz and Br vs z, r=1.724 m 11

  12. Summary • 2 Tesla field studied • comparison with Tosca • study of Mapper alignment correction in the plane z=0 • of the order 1 mrad corrections • fairly good agreement with Tosca • Bz scale difference about 1.0075 • maps with higher current next 12

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