forward tracking and gem-based tracker development lee sawyer louisiana tech university tracking...
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![Page 1: Forward Tracking and GEM-based Tracker Development Lee Sawyer Louisiana Tech University Tracking Working Session SLAC ALCPG Workshop 07 Jan 2004](https://reader036.vdocuments.mx/reader036/viewer/2022062518/5697bf811a28abf838c853fb/html5/thumbnails/1.jpg)
Forward Tracking and GEM-based Tracker Development
Lee Sawyer
Louisiana Tech University
Tracking Working SessionSLAC ALCPG Workshop
07 Jan 2004
![Page 2: Forward Tracking and GEM-based Tracker Development Lee Sawyer Louisiana Tech University Tracking Working Session SLAC ALCPG Workshop 07 Jan 2004](https://reader036.vdocuments.mx/reader036/viewer/2022062518/5697bf811a28abf838c853fb/html5/thumbnails/2.jpg)
07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
2
Overview• Group Introduction: Who are these
guys and why are they working with GEMs?
• What we have done so far– Tracker Prototype Development– Detector Simulation– Physics Simulation
• What we plan to do in the next year– Tracker construction and testing– Simulations and physics studies
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
3
2003 Proposed Work at Louisiana Tech
• Joint Proposal: “Evaluation of a GEM-Based Forward Tracker for the NLC” ($39k in Y1)– Hardware: Build a prototype GEM chamber
suitable for forward tracking– Software: Study design parameters for a
tracker in the far-forward region. • Since the proposal
– Additional funds requested from LA Board of Regents (3 proposals) for chamber manufacture, multiplexing circuitry, faculty & student support (~ $200k).
– Foils + test chamber delivered from Sauli at CERN
– Investigating alternate sources for foils (w/ UTA, et al.)
– First meeting with OK on simulation studies– Standalone GEM simulation software installed
-> simulate detector configurations
<= 33% of my talk at Arlington Workshop
(Jan 2003)
2004-2006 LCRD/UCLC proposal requests continuation at this level.
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
4
Louisiana Tech University• Engineering school in north central LA
– Near Shreveport – Graduate programs in engineering and science, MS Physics,
PhD Engineering Physics and Computational Physics• High Energy Physics Group
– Three faculty: Sawyer, Greenwood, Parashar– DoE supported group; primary focus is D0 at Fermilab– Two postdocs, 4-6 graduate students– Previous detector construction
• Intercryostat Detector: Built electronics, support structures, installed & commissioned.
• Run IIb Silicon Upgrade: Cable design & testing– Smaller project with curtailed upgrade (Layer 0)
– Groups members have previous experience at e+e- colliders (Sawyer ->ALEPH) and neutrino experiments (Greenwood).
• Medium Energy Nuclear Physics Group– Four faculty: Forest, Johnston, Simicevic, Wells– NSF supported group; several experiment collaborations at
JLAB (G0, QWEAK, CLAS,…)– 4-6 graduate students– Previous detector construction
• Cryostat Exit Detectors (CED), trigger electronics for G0.• Responsible for designing trackers for QWEAK.
Greenwood
Parashar
Forest
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
5
Location of Region 1 Vertex Location of Region 1 Vertex DetectorDetector
Primary Collimator
GEM based Vertex Detector behind primary Collimator
QWEAK Experiment• Approved JLAB Hall C
experiment– Study of proton weak
charge– Search for new TeV-scale
physics• Magnet design and vertex
detector are primary LA Tech responsibilities
• Proposed Vertex Detector is a 3-layer GEM within Roahcell chamber– First GEM foils delivered
June, 2003– Work began in earnest Mid-
summer, 2003– Prototype completed for
testing by Fall, 2004– Chamber construction
slated to begin Fall, 2005.
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
6
QWEAK GEM Chamber
2 stage primary collimator2 stage primary collimator
LH2Target
First Stage of Primary collimator Air Gap
2nd Stage
GEM Location?
Zoom InZoom In
5 mm Roahcell3 mm Argon
50 micron Copper
Focal Plane Detectors
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
7
GEM Studies at LA Tech• GEM detector development for QWEAK
tracker => Application to other experiments?
• Interest in Linear Collider, forward tracking identified as area needing work– Physics needs include luminosity,
precision electroweak measurements (WW, WZ), SUSY searches & measurements (e.g. selectron production)
• Can a GEM-based detector work in the Intermediate to Forward region of proposed LC detector?– Concentrating on LD, region from lower
TPC to mask (FCH in the TESLA detector design)
– Competing technologies are straw tubes, scintillating fibers (intermediate tracker)
Figures from Linear Collider Resource Book
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
8
GEM Work on 2003• Procured first GEM foils• Design pf charge
collector – LASER milled at local
manufacturer– Expect delivery summer,
‘04
• Developing HELIX-128 chip for readout– Used in COMPASS
experiment
• Studies of electric field using ANSYS simulations– Important for QWEAK
resolution studies– Input to tracking algorithm
• All work represents a partnership between QWEAK/LC groups– Two grad. Students
supported by DoE LC supplement
• Bharat Madireddy(HELIX r/o, JAS2)
• Subramanian Narayanan(Current monitor & trigger)
– Two more students supported by Nuclear group (GEM field simulations, tracker construction)
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
9
GEM Simulations• 2-D ANSYS simulation
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
10
2D Model – Additional Notes• Computational mesh
– Requires high grid density in areas around the hole to sufficiently resolve the electric field
– Becomes an issue when generating the 3D mesh
Hole Centerline
Kapton edge
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
11
3D Model Mesh
Some views of the Kapton Foil
Shownwith Argoncells
Without Argon Cells
![Page 12: Forward Tracking and GEM-based Tracker Development Lee Sawyer Louisiana Tech University Tracking Working Session SLAC ALCPG Workshop 07 Jan 2004](https://reader036.vdocuments.mx/reader036/viewer/2022062518/5697bf811a28abf838c853fb/html5/thumbnails/12.jpg)
07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
12
3D Model Results AnimatedElectric Field Strength
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
13
HELIX-128 CHIP• Fast digitizing 128 Ch. ADC
ADC
128Charge Collector strips
128Charge Collector strips
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
14
Design
Jena Kraft
Gem Foil
Foil Support
IonizationChamber
“Dynamic” CAD design template
•Pitches and geometries are parameters
•Flexible design changes
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
15
Prototype
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
16
Trigger Electronics
R.Bellazzini , NIM A478, (2002)13-25
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
17
Power supply current Monitor
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
18
LC Simulations
• Less progress to report• Have installed JAS2, copied SIO files
from SLAC– Firewall issues prevented remote
processing
• Attempts to install GEANT4 version of simulation failed– Current D0 simulation configuration is
GEANT3+Linux– Tried to install GEANT4 in WinXP env.
• Is documentation up to date?
![Page 19: Forward Tracking and GEM-based Tracker Development Lee Sawyer Louisiana Tech University Tracking Working Session SLAC ALCPG Workshop 07 Jan 2004](https://reader036.vdocuments.mx/reader036/viewer/2022062518/5697bf811a28abf838c853fb/html5/thumbnails/19.jpg)
07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
19
JAS2 Results• Mostly proof-of-
principle at this point…
• Track reconstruction:– ZZ pair production– 500 events
• Event Display– Using hep.lcd plug-
in– SD detector
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07 Jan 2004SLAC ALCPG Wkshp
Lee SawyerLouisiana Tech University
20
Plans for the Coming Year• Continue Work on GEM tracker design
– LC prototype tracker in parallel development with QWEAK tracker•What are the unique design consideration for
the FCH? (Timing for bunch separation? Rate?)
– Cosmic tests of prototype tracker by 2005– Beam tests at JLAB in 2006?
• Ramp-up simulations work– Closer collaboration with other forward
tracking groups (OK, Hampton, UCSC)