Some Plots from Mu2eG4
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Some Plots from Mu2eG4 . Goals - To get a feel for the T-tracker acceptance - I will just show plots that struck me as being important for pattern recognition - Will be much more quantitative in the very near future. Caveats - The C++, Root learning curve was steep, so I didn’t get

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Some Plots from Mu2eG4

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Some plots from mu2eg4

Some Plots from Mu2eG4

Goals

- To get a feel for the T-tracker acceptance

- I will just show plots that struck me as being important for pattern

recognition

- Will be much more quantitative in the very near future.

Caveats

- The C++, Root learning curve was steep, so I didn’t get

as much done as I’d like.

Thanks to Rob for helping out !!!

Hogan Nguyen

Jan 5th 2010


Some plots from mu2eg4

From Rob’s Cornell Seminar December 19th 2010


Some plots from mu2eg4

X-Y Straw Hit Location for Signal Electrons from ntuple in Readback.cc

DS Field Strength = -0.5 T

2

1

0

3

4

5

Even Planes Even Sectors

Even Planes Odd Sectors


Some plots from mu2eg4

X-Y Straw Hit Location for Signal Electrons from ntuple in Readback.cc

DS Field Strength = -0.5 T

1

2

0

3

5

4

Odd Planes Even Sectors

Odd Planes Odd Sectors


Some plots from mu2eg4

Conversion Electrons

Generated with

Cos(Polar) = 0.7

~ 1.8 orbit cycles

PT(Plane=0) = 75 MeV

Radius(Plane=0) = 25 cm

Radius(Plane=35) = 24.95 cm

Orbit radius shrinks by

500 microns, or 5x the

hit resolution !

energy

loss in

target ?


Some plots from mu2eg4

Conversion Electrons

Generated with

Cos(Polar) = 0.5

~ 2.5 orbit cycles

PT(Plane=0) = 90.9 MeV

Radius(Plane=0) = 30.31 cm

Radius(Plane=35) = 30.19 cm

Orbit radius shrinks by

1.2 mm, or 12x the

hit resolution !


Some plots from mu2eg4

Conversion Electrons

Generated with

Cos(Polar) = 0.3

Radius(Plane=0) = 33.39 cm

Radius(Plane=35) = 33.13 cm

Orbit radius shrinks by

2.6 mm, or 1 straw radius !


Some plots from mu2eg4

Other Configurations

MC doesn’t support transporting

backwards conversion electrons

ie. generating cos(polar) = -0.7 doesn’t work


Some plots from mu2eg4

At least two panels are required

to reconstruct x AND y.

Track intercepts

exactly 1 panel

2 panels

3 panels

4 panels

Asset’s T-tracker Memo V4


Some plots from mu2eg4

To do Pattern Recognition,

Need to start with regions

where track goes through

2 panels.

2 panels are needed to

make “seed” hits.

Radius 0 panels 1 panels 2 panels > 2 panels

0-38 cm 100% 0 0 0

38-43 cm 0% 50% 50% 0

if track enters a station,

95% chance for

entering regions

with at least 2 panels

cos(polar) = 0.3


Some plots from mu2eg4

cos(polar) = 0.7

cos(polar) = 0.5

if track hits a station,

83.5% chance of

entering region with

at least 2 panels

if track hits a station,

93.6% chance of

entering region with

at least 2 panels


Some plots from mu2eg4

A Conversion Electron Event

Station 12

All stations

1 mm bins

Station 10

2 mm bins

For patter recognition,

will need to understand

the typical scatter

in these points within

each station

1 mm bins


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