Test of the SSD Electronics for the
STAR HFT Upgrade
Howard Matis - LBNL
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SLAC ESTB Workshop – March 2011
Previous Uses (2007) of Electron Test Beams
LBNL’s Advanced Light Source – 1.5 GeV e’s
LHC luminosity monitor
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SLAC ESTB Workshop – March 2011
1.5 GeV electron source (ALS)
Test of MAPS pixel sensor
Quadrant with (left) and
without (right) electron
source applied.
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H. Matis (hsmatis@lbl.gov)
Vertex 2003
Usefulness of the ex-ALS Beam
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Easy to schedule time
Flexible use of beam
Lots of setup and debug time
Access detector almost anytime
Good technical support
Platform for mounting apparatus
Trigger counters in line
Not useful for physics experiments
Experts to beam tune
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Other wishes
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Patch panels
Easy way to have single point ground
Silicon telescope (not sure how to interface it with our system)
SLAC ESTB Workshop – March 2011
STAR at BNL is adding an inner tracking
detector
Building a 2 layer MAPS
detector – very thin with
20 µm pixels (See L.
Greiner’s Talk)
A larger Silicon Pixel
Detector - IST
A “refurbished” Silicon
Strip detector – SSD
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Originally designed to run
at 1 Hz
Must now run at 1000 Hz
SLAC ESTB Workshop – March 2011
SSD upgrade
Detector silicon remains the
same
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Dual sided silicon
768 strips/module
75 mm × 42 mm
95 µm strip pitch
35 mrad angle
r-φ= 20 µm; z =740 µm
New
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Analog to Digital Readout
RDO – Collector of Digital
Data which sends it to DAQ
We need a test beam to
verify performance of new
electronics
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SLAC ESTB Workshop – March 2011
Schematic
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SLAC ESTB Workshop – March 2011
Actual SSD Module
Module Before electronics
folded
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Final version
SLAC ESTB Workshop – March 2011
Why we want a real beam
Test of electronics with real particles
Proper ionization values
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Too often tricked with Fe55
Good way to measure rate affects
Can trigger on a beam
Efficiency Tests
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SLAC ESTB Workshop – March 2011
Layout of Test
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SLAC ESTB Workshop – March 2011
Parameters required for Beam Tests
Beam parameters
Value
Comments
electron
Could also use pions or
hadrons
> 3 GeV
As high as possible
4 to 1000 kHz
Test rate effects
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> 4 µs gap per pulse
Particle Type
Energy
Rep Rate
Charge per pulse
Energy Spread
Does not matter
Bunch length rms
Does not matter
Beam spot size, x-y
2 cm × 2 cm
Want to test whole detector
without moving
Others (emittance, …)
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Logistics
Requirements
Space requirements (H x W x L)
8” ⨉ 8” by 3” high + trigger scintillators
Duration of Test and Shift Utilization
One or two days; Come back in a few
weeks; Day to setup.
Desired Calendar Dates
Spring 2012
Not my project
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SLAC ESTB Workshop – March 2011
UCLA IEP/RHI Group
(Huan Z. Huang, G. Igo, S. Trentalange, O. Tsai)
New R&D for W powder SciFi (scintillating
fiber) calorimeters
Possible applications in STAR at RHIC:
STAR forward upgrades
Transformation STAR➞ eSTAR
Dedicated EIC (Electron Ion Collider) detector
Simple to build in a university environment, cost effective,
flexible technique to build compact sampling calorimeters.
We plan to have test run in the fall 2011.
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SLAC ESTB Workshop – March 2011
INTERACTION POINT (June 20, 2003)
“Cooperative Spirit of SLAC Pays Off for UCLA Researchers.”
Test Run T466 at SLAC
•In 2003, tested small
EMC prototype at SLAC
•Refined construction
technique in 2004
•Scheduled for a test run at
SLAC in the fall of 2004
•Test run was postponed
•Not able to continue R&D in
this direction
•Now ready to resume
This method of building ScFi calorimeters has yet to be proven!
A SLAC Test Beam Facility is very important for calorimetry R&Ds!
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SLAC ESTB Workshop – March 2011
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As a proof of principle, we want to build 4
towers x 4 towers EMC prototype using new
technique. We call it “spacardeon”
• Each tower will be about 20 rad. length long
• a bit more then 1" x 1”
•If funds available will try to investigate possibility of
building a “SPACAL”
•hadronic calorimeter using W powder/SciFi.
Beam
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SLAC ESTB Workshop – March 2011
Parameters required for Beam Tests
Beam parameters
Value
Particle Type
e
Energy
Rep Rate
1 - 10 GeV
The higher the better
1000 Hz or less
Charge per pulse
1 e-
Energy Spread
1%
Bunch length rms
Beam spot size, x-y
Comments
Variable 1-3 e-
<1 cm
2 ⨉ 2 cm or less
Others (emittance, …)
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Logistics
Requirements
Space requirements (H x W x L)
1.5 m ⨉1.5 m ⨉ 2 m
Duration of Test and Shift Utilization
Depends on rate, one week, 12 or 2 ⨉ 8 or 3 ⨉
8 hours
Desired Calendar Dates
Late summer, fall 2011
SLAC STB Workshop – March 2011
Summary
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Test beams have been very useful in the past
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Lack of test beams in the US
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Detector R & D
Production of detectors
BNL does not have one
ALS stopped providing it
Fermilab?
Jefferson Lab?
CERN is expensive and difficult to use
A SLAC test beam would fill a natural gap
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Easy to use for those on the west coast
SLAC ESTB Workshop – March 2011
Backup
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SLAC ESTB Workshop – March 2011
Example. Possible evolution of calorimeters in
STAR. Forward direction (West side).
Should consider:
Available space
Magnetic Field
Radiation
Installation/Integration
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SLAC ESTB Workshop – March 2011