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Beam Tilt: Can we see a (MC) beam tilt?

This text discusses the analysis of beam tilt in a Monte Carlo simulation, including plotting vs. z slices, fitting to a standard form, and analyzing the results.

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Beam Tilt: Can we see a (MC) beam tilt?

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  1. Beam Tilt & TFC: Can we see a (MC) beam tilt? 1. Plot <b> vs f for different z (barrel) slices 2. Fit to standard form <b> = r*sin(f + f0) + c (here c should be only a cross check.) No offset or tilt: r=0 f0 = meaningless A beam offset: r = constant f0 = angle to beam center from x-axis A beam tilt: r = r(z) = mr*z + h f0= angle to beam center from x-axis JDH, STT meeting

  2. <b>, mm B1 B2 B3 f (degrees) B4 B5 B6 r, mm f, rad z, cm b, mm ZH->nnbb no beam tilt 6 for barrels 3 summary no tilt, expect r =0 f = random JDH, STT meeting

  3. <b>, mm B1 B2 B3 f (degrees) B4 B5 B6 r, mm f, rad z, cm b, mm Tilt sample (Lorenzo) x, y=.5 mm/cm so expect mr=.7 mm/cm f=2.35 rad(?) c=0.0 JDH, STT meeting

  4. Tilt sample, again after applying online correction expect mr= 0 mm/cm f= random find, m consistent w/0! Slightly better b JDH, STT meeting

  5. Looks encouraging - see correct tilt using STT trigsim tracks - after applying correction, see expected flat distribution for r(z). - concern: the no-tilt sample gives poor c2 values for both fits. Why? Don’t know, but -> p10 SMT MC problem, fixed in p11 -> bug in my code… - work continues… JDH, STT meeting

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