Cornell Linear Collider Detector Research Cornell Interests: The Cornell group proposes to contribute to development of charged particle tracking for the the N. American Large Detector design. Detector Development (in collaboration with Purdue University ) (funding requested through UCLC) Personnel: R. S. Galik J. Miyamoto (Purdue) D. Peterson I. P. J. Shipsey (Purdue) & students Event Reconstruction, Pattern Recognition ( funding through the LEPP base grant) D. Peterson, Cornell Univ., Round table 23-Jan-2003 Charged Particle Tracking at the Linear Collider The challenges: Momentum resolution pt/pt=4 x 10-5/Gev (can be achieved with) 2 meter outer radius detector, 3 Tesla 120 m spatial resolution 10 m intermediate detector at R=0.4 m 10 m vertex detector
Track density, Reconstruction efficiency 100 tracks/steradian full efficiency for energy flow 5% occupancy goal requires 1/2000 ster. segmentation example: 1.25cm(r-) x 1cm(z) at 50cm(R) Schematic quarter-section of the N. American Large Detector including a 2 m radius Time Projection Chamber. Noise density 1% by volume requires more segmentation D. Peterson, Cornell Univ., Round table 23-Jan-2003 Detector Development, issues GEM/MicroMegas amplification read-outs are expected to have advantages over traditional anode-amplification read-outs. Signals are due to electron transport, rather than induction. The signal width is narrow, typically 1 mm, or less, providing improved segmentation and resolution. ExB effects, present with anode-wire-amplification, are minimized; an improvement in resolution is expected. GEM readout: amplification is
localized in the GEM holes. Signal is due to electron transport. But, there are many outstanding issues. Resolution: How do we balance resolution with the size of the readout ? GEM/MicroMegas signals may be small compared to the pad width. minimal charge sharing e.g. 5mm () x 1cm (r) pads ( 500 thousand pads ) The resolution, without charge sharing, is 1.4mm (require < 120 m). e.g. 1mm () x 1cm (r) pads ( 2.4 million pads ! ) provides charge sharing The resolution may be sufficient but number of channels is prohibitive. While the electron transport signal is fundamentally narrower than the induction signal, sufficient ( anticipated ) resolution, in a TPC, has not been demonstrated. D. Peterson, Cornell Univ., Round table 23-Jan-2003 Detector Development, Cornell/Purdue Program Systematic study spatial resolution and signal width using GEM/MicroMegas TPC readout devices amplification device, details of spacings and gain, pad size and shape gas applied signal isolation/spreading (Signal may require spreading in and isolation in R.) Signal spreading must be optimized for segmentation and resolution. Spatial resolution and signal width studies using traditional anode-wire-amplification read-out devices Investigate a readout using smaller wire spacing to reduce the ExB effects. Ion Feedback measurements
Instrument the high voltage plane, or an intermediate grid. Tracking studies in a high radiation environment Studies of signal distortion and electric-field break-down. Tracking studies in a magnetic field Cornell has the expertise and utilities to build and operate a superconducting test magnet. D. Peterson, Cornell Univ., Round table 23-Jan-2003 Currently Active/Funded R&D TPC with GEM/MicroMEGAS BOTTOM TOP 8 J anuary 2002 Dean Karlen / Carleton University 10 Carleton (GEM) DESY (GEM) (printed cage) Saclay/Orsay (MicroMegas) D. Peterson, Cornell Univ., Round table 23-Jan-2003
Currently Active/ Funded R&D TPC with GEM or MicroMEGAS Victoria (GEM) MPI Munich (wire ampl.) Karlsruhe (fits in DESY magnet) NIKHEF (GEM) D. Peterson, Cornell Univ., Round table 23-Jan-2003 Currently Active/Funded R&D TPC with GEM/MicroMEGAS DESY Saclay D. Peterson, Cornell Univ., Round table 23-Jan-2003 what Cornell can offer Experience with Large drift chambers for CLEO Test chambers Manufacturing
Small drift chambers Innovative construction calibration D. Peterson, Cornell Univ., Round table 23-Jan-2003 what Purdue can offer Years of experience with MPGDs, preparation and radiation hardness measurements Micro Pattern Detector Aging (Radiation Hardness) Example: triple GEM with PCB readout Gas Ar/CO2 70/30 (99.99%) GEM1= 400 V GEM2= 390 V GEM3 =380 V PCB as e- collector 1600 Gas gain 6,000 1400 Best result obtained with a GEM. Similar result obtained with
0 13.5 0 Stolen from I. Shipsey, NIM A 478 (2002) 263 pressure (psig) Detector performance small (~15% gain loss) after ~ 8 years @LHC 10 cm from IP. Minimal signs of aging. Relative pulse height (ADC count) Cr X-rays (5.4 KeV) @ 6 x 104 Hz/mm2 for 750hrs 5 10 15 20 25
30 Accumulated charge (mC/mm 2) D. Peterson, Cornell Univ., Round table 23-Jan-2003 TPC Test Chamber R&D at Cornell University and Purdue University Three Year Plan (at Cornell) Plan Purchases 1st Year track definition scintillator trigger small drift chambers test device, TPC power supplies data acquisition VME crate Computer and LabView controller discriminators for drift chambers TDCs for drift chambers FADCs for TPC (limited)
power supply frame power supplies electronics boards $ 52,000 equipment 2nd Year expanded TPC superconducting magnet expanded DAQ expanded TPC superconducting magnet expanded DAQ 3rd Year (at Purdue) 1st Year $ 121,000 equipment $ 74,000 equipment MPGD readout modules printed circuit pad readout planes
GEMs, MicroMegas $ 10,000 equipment $ 16,000 student support nd 2 Year advances in MPGD readout modules $ 10,000 equipment $ 16,000 student support 3rd Year advances in MPGD readout modules $ 10,000 equipment $ 16,000 student support D. Peterson, Cornell Univ., Round table 23-Jan-2003 Short Term Activities Cornell: Purchases of electronics, set-up and testing of electronics, are delayed until we receive UCLC funding from NFS. (That will be late spring 2003 under the absolute best conditions.) construction of a first TPC device construction of telescope drift chambers and trigger scintillators We can start when technical staff and machine shop staff are available, at the completion of the CESR-Wiggler/CLEO-inner-chamber installation, ~ June 2003 . Purdue: may be ready to construct a readout module D. Peterson, Cornell Univ., Round table 23-Jan-2003
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