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Forward Tracking and GEM-based Tracker Development

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Presentation on theme: "Forward Tracking and GEM-based Tracker Development"— Presentation transcript:

1 Forward Tracking and GEM-based Tracker Development
Lee Sawyer Louisiana Tech University Tracking Working Session SLAC ALCPG Workshop 07 Jan 2004

2 Louisiana Tech University
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 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

3 2003 Proposed Work at Louisiana Tech
<= 33% of my talk at Arlington Workshop (Jan 2003) 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 LCRD/UCLC proposal requests continuation at this level. 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana 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 Cryostat Exit Detectors (CED), trigger electronics for G0. Responsible for designing trackers for QWEAK. Greenwood Parashar Forest 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

5 Louisiana Tech University
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. 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

6 Louisiana Tech University
QWEAK GEM Chamber 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

7 Louisiana Tech University
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 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

8 Louisiana Tech University
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) 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

9 Louisiana Tech University
GEM Simulations 2-D ANSYS simulation 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana 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 Kapton edge 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University Hole Centerline

11 Louisiana Tech University
3D Model Mesh Shown with Argon cells Without Argon Cells Some views of the Kapton Foil 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

12 3D Model Results Animated
Electric Field Strength 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

13 Louisiana Tech University
HELIX-128 CHIP Fast digitizing 128 Ch. ADC A D C 128 Charge Collector strips 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

14 Louisiana Tech University
Design “Dynamic” CAD design template Pitches and geometries are parameters Flexible design changes Ionization Chamber Gem Foil Foil Support Jena Kraft 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

15 Louisiana Tech University
Prototype 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

16 Louisiana Tech University
Trigger Electronics R.Bellazzini , NIM A478, (2002)13-25 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

17 Power supply current Monitor
07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

18 Louisiana Tech University
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? 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

19 Louisiana Tech University
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 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana 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) 07 Jan 2004 SLAC ALCPG Wkshp Lee Sawyer Louisiana Tech University

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