prex gems - thomas jefferson national accelerator facilityprex gems seamus riordan stony brook...
TRANSCRIPT
PREX GEMs
Seamus RiordanStony Brook University
December 15, 2014
Seamus Riordan PREX GEMs 1/9
Overview
Requirements
Previous Setup
SBS GEMs
Work to do
Seamus Riordan PREX GEMs 2/9
Requirements
We have a rate of ∼ 1 MHz/µANeed 1 µA to use standard beam monitorsMax ∼ 2 kHz/mm2 at VDC and quartz
VDC’s with standard electronics can operate at 20 kHz/wire(1 cm spacing), APEX goes to 75 kHz/wire
GEMs dmonstrated to work at 25 kHz/mm2
x [m]-0.1 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.1
kHz/
cm
0
20
40
60
80
100
120
140
160
180
200
220
AµPREX Rate Density at VDC X - 1 AµPREX Rate Density at VDC X - 1
y [m]-0.05 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 0.05
kHz/
cm
0
100
200
300
400
500
600
700
800
AµPREX Rate Density at VDC Y - 1 AµPREX Rate Density at VDC Y - 1
Seamus Riordan PREX GEMs 3/9
Requirements
We have a rate of ∼ 1 MHz/µANeed 1 µA to use standard beam monitorsMax ∼ 2 kHz/mm2 at VDC and quartz
VDC’s with standard electronics can operate at 20 kHz/wire(1 cm spacing), APEX goes to 75 kHz/wire
GEMs dmonstrated to work at 25 kHz/mm2
x [m]-0.1 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.1
kHz/
mm
0
5
10
15
20
25
30
35
AµPREX Rate Density at Quartz X - 1 AµPREX Rate Density at Quartz X - 1
y [m]-0.05 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 0.05
kHz/
mm
0
10
20
30
40
50
AµPREX Rate Density at Quartz Y - 1 AµPREX Rate Density at Quartz Y - 1
Seamus Riordan PREX GEMs 3/9
Requirements
We have a rate of ∼ 1 MHz/µANeed 1 µA to use standard beam monitorsMax ∼ 2 kHz/mm2 at VDC and quartz
VDC’s with standard electronics can operate at 20 kHz/wire(1 cm spacing), APEX goes to 75 kHz/wire
GEMs dmonstrated to work at 25 kHz/mm2
y [m]0.04− 0.02− 0 0.02 0.04
x [m
]
0.1−
0.05−
0
0.05
0.1
2kH
z/m
m
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
AµPREX Rate Density at VDC X vs. Y - 1
y [m]0.1− 0.05− 0 0.05 0.1
x [m
]
0.04−
0.02−
0
0.02
0.04
2kH
z/m
m
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
AµPREX Rate Density at Quartz X vs. Y - 1
Seamus Riordan PREX GEMs 3/9
Stolen from Nilanga Liyanage
Seamus Riordan PREX GEMs 4/9
PREX Original GEM Layout
Seamus Riordan PREX GEMs 5/9
PREX Original GEM Layout
Seamus Riordan PREX GEMs 5/9
PREX Original GEM Layout
Seamus Riordan PREX GEMs 5/9
SBS GEM Production
UVA producing40 50×60 cm2 modules forSBS rear tracker
Will have 6 prototype40×50 cm2 modules alongwith many SBS modulescompleted around PREXtime
Efficiency is non-uniform,but spot can positionedaway from spacer dead-areas
New frame will have to bedesigned - bolt onto HRSframe(?)
Seamus Riordan PREX GEMs 6/9
Readout
Two APV25 readout systems have been employed for GEMsin JLab-related development activities
SRS - To be utilized in Hall B pRad, UVA has 10k channelsMPD - used in INFN development, will be employed byTritium and SBS, VME based (1 module = 2048 channels)
Need 2 working systems - only need to instrument 4000channels in each arm
Work is underway to have both of these put in CODA (needsto be done with MPD in Hall A for Tritium)
Seamus Riordan PREX GEMs 7/9
Tracking
Tracking for GEMs can besolved using standard Hall ATree Search Alogrithm byOle
Has been integrated in withanalyzer by Ole(TreeSearch-GEM libraryexists) - just needs to beworked into our replay
SBS and SoLID need toproduce GEM pseudodata totest tracking software - thisis a good addition
MS resolution effects shouldbe evaluated - we have 10%RL of quartz
Seamus Riordan PREX GEMs 8/9
Summary
Sufficient GEMs will exist for PREX running for our trackingpurposes
New frame needs to be designed
DAQ electronics will exist and will need to be incorporatedinto our system - should be integrated into CODA by then
Counting mode software libraries need to be updated tohandle tree search with GEMs
Seamus Riordan PREX GEMs 9/9