Residuals

Using the single-particle commands in PISA, throw particles (5 GeV muons) into the N endcap like this:
run the phi zvertex side view
121 20° 20° 0 pic
122 10° 04° 0 pic
123 27° 04° 0 pic
124 10° 04° -10 pic
125 19° 04° -10 pic


Commands: 

pisa
exec single
  (capture drawing)
  exit
pisaRootRead
mv ancsvx.root ancsvx_nnn.root
ln -sf ancsvx_nnn.root ancsvx_softlink.root
root -l
  .x residual.C
  .x resid2.C
  (capture plots)
  .q
Results

Theta, phi of the track at the origin are projected onto the endcaps (red dot), and compared with the actual hit, which falls in a distribution around this point. This distribution is projected onto two orthogonal axes, using the simplifying assumption that the Si surface is perpendicular to the track, which is roughly true.

Results:


Residual distributions (in cm) in the theta and r-phi directions for the 4 lampshades of the N endcaps.

This run was for run 125: 5 GeV muons, centered on the = 19° and phi = 4°, in a 1° cone.

Results: (output from residual.C + resid2.C) 

 cfmgmc.input5  5  20  20  1  10  0  0  0  0  
 layer 09:    35    33
 layer 10:    49    44
 layer 11:    65    53
 layer 12:    87    75

 cfmgmc.input5  5  10  3.75  1  10  0  0  0  0  
 layer 09:    25    25
 layer 10:    33    37
 layer 11:    51    54
 layer 12:    74    75

 cfmgmc.input5  5  27  3.75  1  10  0  0  0  0  
 layer 09:    46    48
 layer 10:    68    60
 layer 11:    93    87
 layer 12:   131   134

 fmgmc.input5  5  19  3.75  1  10  0  0  -10  0  
 layer 09:    86    92
 layer 10:    78    88
 layer 11:   111   114
 layer 12:   131   143 

 fmgmc.input5  5  10  3.75  1  10  0  0  -10  0
 layer 09:    65    73
 layer 10:    82    89
 layer 11:   127   134
 layer 12:   127   149
The residuals in the table below are the average of the sigma_theta, sigma_phi of the gaussian fits to the residual distributions.

5 GeV mu+ residuals (um)  
run the phi zvertex side view 9 10 11 12 comments
121 20° 20° 0 pic 33 45 63 82 1 barrel, center of 4 endcaps
122 10° 04° 0 pic 24 34 52 70 no barrel, bottom of 4 endcaps
123 27° 04° 0 pic 45 60 98 112 2 barrel, top of 4 endcaps
124 10° 04° -10 pic 77 94 128 156 z= -10 cm, bottom of mu acceptance
125 19° 04° -10 pic 79 95 124 151 z = -10 cm, 2 barrel + 4 endcaps


2 GeV mu+ residuals (um)  
run the phi zvertex 9 10 11 12 comments
126 10° 04° 0 89 83 103 137 no barrel, bottom of 4 endcaps
127 27° 04° 0 117 163 250 467 2 barrel, top of 4 endcaps
128 10° 04° -10 208 237 338 355 z= -10 cm, bottom of mu acceptance
129 19° 04° -10 300 210 285 308 z = -10 cm, 2 barrel + 4 endcaps


10 GeV mu+ residuals (um)  
run the phi zvertex 9 10 11 12 comments
130 10° 04° 0 12 17 26 35 no barrel, bottom of 4 endcaps
131 27° 04° 0 24 31 49 68 2 barrel, top of 4 endcaps
132 10° 04° -10 40 52 66 77 z= -10 cm, bottom of mu acceptance
133 19° 04° -10 38 42 60 69 z = -10 cm, 2 barrel + 4 endcaps


Just to check: turn the barrel off (with lbarrel in svx.f)

5 GeV mu+ residuals (um)  
run the phi zvertex 9 10 11 12 comments
134 10° 04° 0 20 28 45 62 no barrel, bottom of 4 endcaps
135 27° 04° 0 20 24 35 52 2 barrel, top of 4 endcaps
136 10° 04° -10 38 47 62 73 z= -10 cm, bottom of mu acceptance
137 19° 04° -10 32 42 52 63 z = -10 cm, 2 barrel + 4 endcaps

Last update 14 Sep 2005 - HvH