Optics Simulations - Idaho State Universityphysics.isu.edu/.../parityCollabMeeting_2009Jul10.pdf ·...

Optics SimulationsDustin McNulty

[email protected]

July 10, 2009

HAPPEX/PVDIS/PREX Jefferson Lab Hall A'

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Optics Simulations

Outline

• New HRS Optics Tune for PREx

• AT Hole Studies – Be X◦, FoM and Detector Size

• HAPPEX-III Focal Plane Distribution

• PREx Optics/detector beamtest during H-IIICommissioning at 1pass

• Summary and Future Work

Optics Simulations, July 09 - 10, 2009, Hall A Parity Collaboration Meeting 1


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VDC1u1

v1

o

s0PMT

z

y x

PMT

VDC2

Spectrometer Coord. Sys. Nomin

al C

entra

l Ray

TOP of VDC BOX

45

Transport z at det1 location

NOT TO SCALE

Transport z= 0

60cm

zy

x

Transport Coord. Sys.



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Standard (Old) and PREx (New) HRS Optics Tune

1

10

210

310

410

510

-1 -0.8 -0.6 -0.4 -0.2 0

Tra

nspo

rt P

lane

y (

m)

-80

-60

-40

-20

0

20

40

60

80-310×

Transport Plane x (m)

RHRS xy (Standard Optics Tune)

HAMC Simulation(Pb, 5deg, 1.05GeV)

1

10

210

310

410

510

610

-1 -0.8 -0.6 -0.4 -0.2 0

Tra

nspo

rt P

lane

y (

m)

-80

-60

-40

-20

0

20

40

60

80-310×


RHRS xy (PREx Optics Tune).



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PREx: Transport Plane Rates

Transport Plane x (m)-1 -0.8 -0.6 -0.4 -0.2 0

A/1

.0cm

)µ

Eve

nt R

ate

(Hz/

210

310

410

510

610

710HAMC Simulation

(Pb, 5deg, 1.05GeV)

4MeV x cut:±

RHRS x (PREx Optics Tune)


AµTot Rate = 21.9 MHz/

Transport Plane y (m)-100 -80 -60 -40 -20 0 20 40 60 80 100

-310×

A/0

.2cm

)µ

Eve

nt R

ate

(Hz/

210

310

410

510

610

710 4MeV x cut:±-6.4 < x < 5.8cm

RHRS y (PREx Optics Tune)

Transport Plane y (m)



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PREx Collimator and AT Hole with 9Be Plug



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AT Hole Event Distributions (PREx Tune)


A/1

.0cm

)µ

Eve

nt R

ate

(Hz/

210

310

410

510

610

710

Bkgd from 8.6% BeAµ2274.7 Hz/

HAMC Simulation

(Pb, 5deg, 1.05GeV)

Be PlugoΧ0.086

4MeV x cut:±





-310×

A/0

.2cm

)µ

Eve

nt R

ate

(Hz/

210

310

410

510

610

710 4MeV x cut:±-6.4 < x < 5.8cm





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Paul’s AT Correction Figure of Merit

M =1E

1√

R

√

1+BS

(1)

• E is the enhancement in AT sensitivity for the hole events(estimated to be∼ 50)• R is the ratio of rates of the detected hole events relative

to the main detector events (Additional factor of 2 reductionto account for radiative tail in hole events)• B/S is the ratio of background to AT hole signal

• The error inflation due to the correction is√

1+M2

• For example, if M = 0.64, error inflation = 1.19



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AT Hole Figure of Merit Study

Detector x size (m)TA0 50 100 150 200 250 300 350 400 450 500

-310×

B/S

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.1310×


-310×

Rate

Rat

io

0

5

10

15

20

25

30

35

40

45

50-310×


-310×

Figu

re o

f Mer

it

0

0.5

1

1.5

2

2.5


-310×

Erro

r Inf

lation

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2



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AT Hole Detector (PREx Tune)

1

10

210

310

410

510

610

-1 -0.8 -0.6 -0.4 -0.2 0

Tra

nspo

rt P

lane

y (

m)

-80

-60

-40

-20

0

20

40

60

80-310×


RHRS xy (PREx Optics Tune)

-1 -0.8 -0.6 -0.4 -0.2 0

Tra

nspo

rt P

lane

y (

m)

-80

-60

-40

-20

0

20

40

60

80-310×



4MeV x cut:±

AµTot Rate = 0.22 MHz/Det Size: 7.6cm by 0.8cm (x by y)

sig:noise = 1.307



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HAPPEX-III Focal Plane Distributions

-800 -600 -400 -200 0 200 400

-310×

Foc

al P

lane

y (

m)

-80

-60

-40

-20

0

20

40

60

80-310×

0

5

10

15

20

25

-610×

Focal Plane x (m)


HAMC Simulation, 14deg, 3.484GeV)

2(25cm H



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HAPPEX-III Transport Plane Distributions

-800 -600 -400 -200 0 200 400

-310×

Tra

nspo

rt P

lane

y (

m)

-80

-60

-40

-20

0

20

40

60

80-310×

0

2

4

6

8

10

12

14

16

18

20

-610×




2(25cm H



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Transport Plane x (m)-800 -600 -400 -200 0 200 400

-310×

Eve

nt R

ate

(arb

. uni

ts/1

.0cm

)

0

0.02

0.04

0.06

0.08

0.1

0.12

-310×


2(25cm H

RHRS x (Standard Optics Tune)

Transport Plane x (m) Transport Plane y (m)-100 -50 0 50 100

-310×

Eve

nt R

ate

(arb

. uni

ts/0

.2cm

)

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

-310×RHRS y (Standard Optics Tune)




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PREX beamtest during HAPPEX-III Commissioning

-1 -0.8 -0.6 -0.4 -0.2 0

Tra

nspo

rt P

lane

y (

m)

-100

-80

-60

-40

-20

0

20

40

60

80

100-310×

-110

1

10



-1 -0.8 -0.6 -0.4 -0.2 0

Tra

nspo

rt P

lane

y (

m)

-100

-80

-60

-40

-20

0

20

40

60

80

100-310×



4MeV x cut:±



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Summary and Future Work

• Based on HAMC simulation of new PREX HRS optics, optimal prex

detector size is roughly 10cm dispersive (x) by 4cm transverse (y)

• For AT measurment/correction FoM studies, AT detector size is

optimized at 7.6cm in x and 0.8cm in y with estimated error inflation

of ∼ 20%

• Examine sieve slit distributions using new PREX optics tune?

• Determine roll and pitch angles for HAPPEX-III detector

positioning?

• Determine Rates for HAPPEX-III running

• Examine thick Ta spectra for H-III commissioning at 1pass?

•



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EXTRA SLIDES



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AT Hole Event Distributions (Standard Tune)


A/1

.0cm

)µ

Eve

nt R

ate

(Hz/

410

510

610

710

Bkgd from 8.6% BeAµ14616.7 Hz/

HAMC Simulation

(Pb, 5deg, 1.05GeV)

Be PlugoΧ0.086

4MeV x cut:±





-310×

A/0

.2cm

)µ

Eve

nt R

ate

(Hz/

410

510

610

4MeV x cut:±-6.4 < x < 5.8cm

RHRS y (Standard Optics Tune)




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AT Hole Figure of Merit Study

Detector y size (m)TA0 5 10 15 20 25 30 35 40 45 50

-310×

B/S

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.1310×


-310×

Rate

Rat

io

0

5

10

15

20

25

30

35

40

45

50-310×


-310×

Figu

re o

f Mer

it

0

0.5

1

1.5

2

2.5


-310×

Erro

r Inf

lation

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2



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AT Hole xy Distributions (Standard Tune)

-1 -0.8 -0.6 -0.4 -0.2 0

Tra

nspo

rt P

lane

y (

m)

-80

-60

-40

-20

0

20

40

60

80-310×

1

10

210

310

410

510



HAMC Simulation

(Pb, 5deg, 1.05GeV)

-1 -0.8 -0.6 -0.4 -0.2 0

Tra

nspo

rt P

lane

y (

m)

-80

-60

-40

-20

0

20

40

60

80-310×



4MeV x cut:±



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Focal Plane x (m)-800 -600 -400 -200 0 200 400

-310×

Eve

nt R

ate

(arb

. uni

ts/1

.0cm

)

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14-310×


2(25cm H


Focal Plane x (m) Focal Plane y (m)-100 -50 0 50 100

-310×

Eve

nt R

ate

(arb

. uni

ts/0

.2cm

)

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

-310×RHRS y (Standard Optics Tune)

Focal Plane y (m)



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PREX beamtest during HAPPEX-III Commissioning


A/0

.917

cm)

µE

vent

Rat

e (H

z/

-210

-110

1

10

210

310HAMC Simulation

(Pb, 14deg, 1.204GeV)

4MeV x cut:±



AµTot Rate = 0.4 kHz/


-310×

A/0

.167

cm)

µE

vent

Rat

e (H

z/

-210

-110

1

10

210 4MeV x cut:±-7.7 < x < 6.5cm




Optics Simulations - Idaho State Universityphysics.isu.edu/.../parityCollabMeeting_2009Jul10.pdf ·...

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Transcript of Optics Simulations - Idaho State Universityphysics.isu.edu/.../parityCollabMeeting_2009Jul10.pdf ·...