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Pad Chamber Simulation Results for Muon Trigger Upgrade

10/13/2003 Muon Trigger Upgrade meeting

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Pad Chamber in PISA

Two Pad Chamber, i.e. pc1/pc2 has been inserted into forward region. All are sandwich of 2 layers of 0.02cm s2 glass and 1,0cm G10 gas. PC1 is a 16 edge polygon with R=110/170cm when in front of /behind station #1. PC2 is a square with edge length 1000cm. The position of PC read from ascii file when running PISA. Note: when move pc1 from muon magnet to the hall, one need to recompile the PISA to change the mother volume into “HALL”. All files has been checked in. The new system is called “MUPC” in the pisa.kumac file. See appendix for all modified or new code.

MuPC hits distribution

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Pad Chamber Momtum Lookup

In PISA, multiple-scattering and energy loss is turned on. Muons with mom = 4-10GeV/c is used as input. One can see after 4GeV/c, the correlation between pc1/pc2) and muon momentum is almost flat.

The distribution of pc1/pc2) shows the sigma value of 2.9 degree for muon with mom>4GeV. In the following, we assume perfect PC resolution and apply different cut on pc1/pc2) to see the rejection and efficiency.

PC1 in front of station #1

PC1 in front of station #1

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Rejection and Efficiency with only pc1/pc2) cut

degree

<1 <2 <3 <4 <5 <6 <7 <8 <9 <10

eff 94% 97% 98% 99% 99% 99% 99% 99% 99% 99%

rej 119 97 88 84 81 79 77 77 76 75

Note: PC1 is in front of the station #1. Run through 2500 filtered event

So the trigger with only the cut does not work with even perfect PC1/PC2 resolution

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Rejection and Efficiency with pc1/pc2) cut and uIDLL1 Fired

degree

<1 <2 <3 <4 <5 <6 <7 <8 <9 <10

eff 90% 93% 94% 94% 94% 95% 95% 95% 95% 95%

rej 1318 1043 939 890 859 821 806 798 794 787

Note: PC1 is in front of the station #1. uIDLL1 rejection factor is: 759 which is smaller than that in previous presentation(about 1000). The file is different and statistic is a factor of 2.5 higher. Run through 2500 filtered event

So the trigger with cut does not improve uIDLL1 too much.

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LUT between PC1/PC2/Symset

Then we do look-up among pc1/pc2/symset. Single muons with mom=4-10GeV/c is passed through PISA. Only multiple-scattering and energy loss are turned on. Here shows only tile size: PC1/10cm, PC2/30cm and PC1 in front of station #1

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Rejection and Efficiency with pc1/pc2) cut and PC1/PC2/uIDLL1 LUT

(1.LUT is satisfied in EITHER directions)

degree

<1 <2 <3 <4 <5 <6 <7 <8 <9 <10

eff 86% 90% 91% 91% 91% 92% 92% 92% 92% 92%

rej 6800 4474 3036 2429 2208 1809 1545 1417 1328 1250

(1). PC1 is in front of station #1. Tile size PC1(10cm), PC2(20cm)

degree

<1 <2 <3 <4 <5 <6 <7 <8 <9 <10

eff 90% 93% 93% 93% 93% 93% 94% 94% 94% 94%

rej 4250 2931 2208 1932 1735 1619 1504 1441 1349 1250

(2). PC1 is behind station #1. Tile size PC1(10cm), PC2(20cm)

Case(2) has less rejection power most likely due to smaller magnetic integral. Less than a factor of two can be achieved

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Rejection and Efficiency with pc1/pc2) cut and PC1/PC2/uIDLL1 LUT

(1.LUT is satisfied in BOTH directions)

degree

<1 <2 <3 <4 <5 <6 <7 <8 <9 <10

eff % 90% 91% 91% 91% 92% 92% 92% 92% 92%

rej 85000 34000 12142 7727 6296 5000 3542 3091 2881 2464

(1). PC1 is in front of station #1. Tile size PC1(10cm), PC2(20cm)

degree

<1 <2 <3 <4 <5 <6 <7 <8 <9 <10

eff 90% 93% 93% 93% 93% 93% 94% 94% 94% 94%

rej 42500 21250 9444 7727 6296 4857 4048 3617 3400 2833

(2). PC1 is behind station #1. Tile size PC1(10cm), PC2(20cm)

Case(2) has less rejection power most likely due to smaller magnetic integral. A factor of 4 ~100 is achieved.