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ISIS-MICE TGT alignment m. apollonio IC

ISIS-MICE TGT alignment m. apollonio IC. p urpose: understand sources of reduced rate comment: probably a 2 nd order effect CAVEAT: result still preliminary, need a thorough check Please DON’T use them in your simulations !!!. CAVEAT: used old drawings Author: MJK CLRC 2006

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ISIS-MICE TGT alignment m. apollonio IC

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  1. ISIS-MICE TGT alignment m. apollonio IC purpose: understand sources of reduced rate comment: probably a 2nd order effect CAVEAT: result still preliminary, need a thorough check Please DON’T use them in your simulations !!! MICE Beam Line PC - 031008

  2. CAVEAT: used old drawings Author: MJK CLRC 2006 Plus some info from Note 216 486.05 MICE Beam Line PC - 031008

  3. Q4-point-1 Q4-point-6 1.76o Inclined_Frame_3 Inclined_Frame_2 Inclined_Frame_1 MICE Beam Line PC - 031008

  4. “nominal” target bottom tip Where is the actual intersection of Q-pole axis with tgt plane? Used 67.1-42.6=24.5 ISIS CL MICE Beam Line PC - 031008

  5. Q1 y x NB coordinates represented in the ISIS frame MICE Beam Line PC - 031008

  6. z x 35. 42.6 ~15. -578.5 MICE Beam Line PC - 031008

  7. z y MICE Beam Line PC - 031008

  8. ... a visual answer “nominal” target bottom tip 3.332o 3.046o ... here 256. ~15. 24.5 ISIS CL MICE Beam Line PC - 031008

  9. CONCLUSIONS with a caveat • from this preliminary study a misalignment is noticed which correspond to an angle of • 0.286o : it is the angle by which the bottom tip of the target (at its lowest point) sees • the entrance of Q1 • how important is this to pion collection at the 1st Q-pole? • my gut feeling says: not relevant • the real answer should rely on a MC simulation • I used an old reference (1st survey by CCLRC) because I think I understand the drawings. • Also partly used info from note 216, but I found it a bit more difficult to understand. • So I want to have the latest figures and re-calculate the axis of the q-poles towards the • target plane • before launching yourself into simulations let me be convinced of the numbers MICE Beam Line PC - 031008

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