# Field studies for 2 Tesla data

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

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• Field studies for 2 Tesla dataMagnetic field meeting, CERN Oct 19, 2006V. KarimkiHelsinki Institute of Physics

• Outline study of Mapper alignment simple alignment correction comparison with Tosca summary2

• 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

• Correction formulasBr -> Br + [(ai + bj sin(f-fj)]BzBphi -> Bphi + [(am + bn sin(f-fn)]Bz- f is arm turning angle- a's are probe dependent- b's and f's are arm dependent4

• Br vs phi at z=0No alignment correctionMapper alignment correction5

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

• Bz and Br vs z, r=0.092 m7

• Bz and Br vs z, r=0.500 m8

• Bz and Br vs z, r=0.908 m9

• Bz and Br vs z, r=1.316 m 10

• Bz and Br vs z, r=1.724 m11

• 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 next12