detector upgrades and responsibilities hampton university, hampton, va 23668, usa blast@doris...
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![Page 1: Detector Upgrades and Responsibilities Hampton University, Hampton, VA 23668, USA BLAST@DORIS Workshop, DESY, March 31, 2008 Michael Kohl](https://reader036.vdocument.in/reader036/viewer/2022081603/56649d555503460f94a33347/html5/thumbnails/1.jpg)
Detector Upgrades and Responsibilities
Hampton University, Hampton, VA 23668, USA
BLAST@DORIS Workshop, DESY, March 31, 2008
Michael Kohl
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Proposed Experiment
• Electrons/positrons (100mA) in multi-GeV storage ringDORIS at DESY, Hamburg, Germany
• Unpolarized internal hydrogen target (buffer system)3x1015 at/cm2 @ 100 mA → L = 2x1033 / (cm2s)
• Large acceptance detector for e-p in coincidenceBLAST detector from MIT-Bates available
• Redundant monitoring of luminositypressure, temperature, flow, current measurementssmall-angle elastic scattering at high epsilon / low Q2
• Measure ratio of positron-proton to electron-protonunpolarized elastic scattering to 1% stat.+sys.
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OLYMPUS
pOsitron-proton and
eLectron-proton elastic scattering to test the
hYpothesis of
Multi-
Photon exchange
Using
DoriS
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Control of Systematics
Luminosity monitors
BLAST @ DORIS
10o
• Change BLAST polarity once a day• Change between electrons and positrons once a day• Left-right symmetry
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Control of Systematics
i = e+ or e-j= pos/neg polarity
Geometric proton efficiency:
Ratio in singlepolarity j
Geometric lepton efficiency:
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Control of Systematics
• Change between electrons and positrons every other day• Change BLAST polarity every other day• Left-right symmetry
Super ratio:
Cycle of four states ijRepeat cycle many times
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Luminosity Monitoring
• Measure Lij relative and continuously
• Pressure, temperature, flow, current measurements
• Forward-angle (high-epsilon, low-Q) elastic scattering (e+ = e-)
• Moller scattering• …
At forward angle:
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Forward Elastic Luminosity Monitor
• Forward angle electron/positron telescope with good angular and vertex resolution
• Coincidence with proton in BLAST
• High rate capability
GEM technology?
MIT protoype:
Telescope of 3 Triple GEM prototypes (10 x 10 cm2) using TechEtch foils
F. Simon et al., IEEE2007, arXiv:0711.3751
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Forward Elastic Luminosity Monitor
• Two symmetric GEM telescopes at 10o
• Sub-percent luminosity measurement per hour for all energies
• 22.5 msr = 30 x 30 cm2 at 200 cm distance• Two GEM layers with ~0.1 mm resolution with ~10 cm gap
→ Vertex resolution (z) of ~1cm at 10o
• Two-photon effect negligible at high- / low-Q2
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MIT GEM-Lab
• GEM R&D at MIT Laboratory for Nuclear Science (LNS)and MIT-Bates Linear Accelerator
• Upgrade of STAR forward tracker
Richard Milner (Principal Investigator)Bernd Surrow (Assistant Professor since 2003)Douglas Hasell (Principal Research Scientist)Frank Simon (Postdoc, previously COMPASS)Jim Kelsey (MIT-Bates Mechanical Engineering)Miro Plesko (MIT-Bates Electronic Engineering)
• F.S. now Junior Group Leader at MPI Munich
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HU Nuclear Physics Group
Cynthia Keppel (Endowed Professor)Eric Christy (Associate Professor)Rolf Ent (Adjunct Professor)Antje Bruell (Adjunct Professor)M.K. (Assistant Professor)
Howard Fenker (Jlab)
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Providing GEM technology
• Collaboration HU-MIT
• Goal: Establish HU/Jlab GEM R&D Center
– Howard Fenker / Bonus collaboration– Thia Keppel / Medical physics applications– Proton Cancer Therapy Center under construction at HU – Augment 12 GeV program at Jlab
– By building C0 cylindrical GEM tracker for TREK, provide technology for 12 GeV program at Jlab
– Luminosity monitors for OLYMPUS– Contributions to OLYMPUS further program?
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Principle of GEM Detectors
• Copper layer-sandwiched kapton foil with chemically etched micro-hole pattern
gas amplification in the hole
• GEM = Gas Electron Multiplier introduced by F. Sauli in mid 90’s, F. Sauli et al., NIMA 386 (1997) 531
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GEM foils
70 µm
140 µm
70 µm
55 µm
5 µm
50 µm``
Typically 5m Cu on 50m kapton
~104 holes/cm2
Chemical etching• R. De Oliveira (CERN-EST)• TechEtch (MIT, BoNuS)• 3M Corporation
Laser drilling• Tamagawa (RIKEN)
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Multi-GEM Detectors
• GEMs can be cascaded for higher gain• Gain of 104 needed for efficient MIP detection
GEM 1
GEM 2
ED
ET
EI
DRIFT
READOUT
DRIFT
TRANSFER
INDUCTION
GEM 1
GEM 2
ED
ET1
EI
DRIFT
READOUT
DRIFT
TRANSFER 1
INDUCTION
GEM 2
ET2 TRANSFER 2
Double GEM Triple GEM
C. Buettner et al., Nucl. Instr. and Meth. A 409(1998)79S. Bachmann et al., Nucl. Instr. and Meth. A 443(1999)464
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TREK/E06 Tracking Upgrade
12 Planar GEMs (C1) between CsI and C2 1 Cylindrical GEM (C0) in replacement of former C1
70 µm
140 µm
GEM technology
Time Reversal Experiment with Kaons: Search for PT (K3)
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C0 Cylindrical GEM for TREK
300 mm
140
mm
160
mm
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BoNuS
• Radial TPC (8-12 cm in./out. Diameter, 20cm active length)• Ran in CLAS end of 2005, first experiment to use cylindrical GEM detector• Further development planned for CLAS and Jlab-12 GeV→ Howard Fenker
• H. Fenker et al., submitted to NIM (2008)
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BoNuS
• Tag neutron initial momentumby measuring spectator proton at low momentum-> neutron structure
• Tag energetic pions by tracking low-momentum ’s and tritons in pion production-> pion cloud study
Barely off-shell Nuclear Structure
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OLYMPUS Detector / Upgrades
• Crucial components for OLYMPUS
BLAST core detector (WC+CC+SC)Additional e+,e- discrimination?Luminosity monitoring
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Further use of BLAST @ DORIS
• Polarized H/D target (ABS)
• Neutron detectors
• Recoil detectors
• Inner tracker
• Forward-angle tracking
• Forward tagging system/quasireal photons
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OLYMPUS Responsibilities
• DORIS - DESY• Transfer of BLAST detector – MIT/Bates• BLAST Cerenkov counters – ASU• BLAST Time-of-flight scintillators – UNH• Unpolarized gas target – MIT/Bates• Luminosity monitors – HU/Jlab
• Electron/positron ID• Maintenance and operation of detector components• Simulation tasks• Analysis tasks