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

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


From Rob’s Cornell Seminar December 19th 2010


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


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


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 ?


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 !


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 !


Other Configurations

MC doesn’t support transporting

backwards conversion electrons

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


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


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


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


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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