Beam Tilt & TFC: Can we see a (MC) beam tilt?
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10/18/02 (updated 11/13/0 2) JDH, STT meeting 1 Beam Tilt & TFC: Can we see a (MC) beam tilt? 1. Plot <b> vs for different z (barrel) slices 2. Fit to standard form <b> = r*sin( + 0 ) + c (here c should be only a cross check.) No offset or tilt: r=0 = meaningless A beam offset: r = constant = angle to beam center from x-axis
description
Beam Tilt & TFC: Can we see a (MC) beam tilt? 1. Plot vs f for different z (barrel) slices 2. Fit to standard form = r*sin( f + f 0 ) + c (here c should be only a cross check.) No offset or tilt: r=0 - PowerPoint PPT Presentation
Transcript of Beam Tilt & TFC: Can we see a (MC) beam tilt?
10/18/02 (updated 11/13/02) JDH, STT meeting 1
Beam Tilt & TFC: Can we see a (MC) beam tilt? 1. Plot <b> vs for different z (barrel) slices 2. Fit to standard form
<b> = r*sin( + 0) + c (here c should be only a cross check.)
No offset or tilt: r=0 = meaningless
A beam offset: r = constant = angle to beam center from x-axis
A beam tilt: r = r(z) = mr*z + = angle to beam center from x-axis
10/18/02 (updated 11/13/02) JDH, STT meeting 2
ZH->bb no beam tilt
6 for barrels
3 summary no tilt, expect r =0 = random
B1 B2 B3
B4 B5 B6
(degrees) <
b>
, m
z, cm
r,
m
, r
ad
b, m
10/18/02 (updated 11/13/02) JDH, STT meeting 3
Tilt sample (Lorenzo)
x, y=.5 m/cm
so expect mr=.7 m/cm
=2.35
rad(?)
c=0.0
B1 B2 B3
B4 B5 B6
(degrees)
<b>
, m
z, cm
r,
m
, r
ad
b, m
10/18/02 (updated 11/13/02) JDH, STT meeting 4
Tilt sample, again after applying online correction
expect mr= 0 m/cm
= random
find, m consistent w/0! Slightly better b
10/18/02 (updated 11/13/02) 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 2 values for both fits. Why? Don’t know, but -> p10 SMT MC problem, fixed in p11 -> bug in my code…
- work continues…
