D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March-2005 1 The Cornell/Purdue TPC Information available at the web site:

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Presentation transcript:

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March The Cornell/Purdue TPC Information available at the web site: * this presentation: LCWS05, Stanford 21-March-2005 * presentation to TPC mini-workshop, Orsay 12-January-2005, * presentation to ALCPG at Victoria, 28-July-2004, * presentation to ALCPG meeting at SLAC, 07-January-2004, * presentation to TPC meeting at Berkeley, 18-October-2003, * presentation to UCLC meeting at Santa Cruz, 30-June-2002, This project is supported by the US National Science Foundation (LEPP cooperative agreement) and by the US Department of Energy (Purdue base program) Cornell University Purdue University D. P. Peterson G. Bolla L. Fields I. P. J. Shipsey R. S. Galik P. Onyisi

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March TPC January 2005: construction completed, recorded first events 14.6 cm ID field cage - accommodates a 10 cm GEM 64 cm drift field length 22.2 cm OD outer structure (8.75 inch)

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March TPC details Read-out end: field cage HV distribution field cage termination readout pad and amplification module front end electronics CLEO II cathode preamps The construction is influenced by our research goal: to compare the various amplification technologies in a common environment. High Voltage end: LEMO HV connectors SHV bias trimming connectors gas connections field cage HV distribution

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March Electronics purchases High voltage system: -20 kV module, 2 channels available -2 kV module, 4 channels available (not part of interfaced system) +2 kV Readout: VME crate PC interface card LabView Struck FADC 32 channels (room for expansion) 105 M Hz 14 bit +/- 200 mV input range ( least count is 0.025mV ) NIM external trigger input circular memory buffer

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March TPC Readout End details Visible: field cage HV distribution field cage termination wire gas-amplification pad board pad biasing boards signal ribbon cable Biasing: drift: termination: -900V ( 1.0 cm ) grid: -600V ( 0.5 cm ) anode: +550V ( 0.5 cm ) pads: -2000V

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March TPC Wire Gas-Amplification 18 anode wires: 5mm spacing anode-pad: 5mm 19 grid layer wires: 5mm spacing grid-anode: 5mm 62 readout pads: 5mm x 10mm This is our first tested readout module. It is chosen to provide a well understood system for establishing a baseline and gaining experience in operating the TPC.

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March Readout size 10 cm readout area is ~2cm x7 cm, 32 pads ( This pad board allows ~3 x 9 cm, 62 pads. )

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March track through the blue/green pads ArCO2 (10%), 300V/cm 100 MHz, 10 ns 2048 time buckets (20.48  s)

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March track through the red/orange pads ArCO2 (10%), 300V/cm 100 MHz, 10 ns 2048 time buckets (20.48  s)

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March track through the yellow/orange pads ArCO2 (10%), 300V/cm 100 MHz, 10 ns 2048 time buckets (20.48  s) Note the noise. This is now greatly reduced.

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March track at 54 cm drift ArCO2 (10%), 300V/cm 25 MHz, 40 ns 2048 time buckets (82  s) (The trigger counters are moved to expose the longer drift distance.)

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March shower ArCO2 (10%), 300V/cm 25 MHz, 40 ns 2048 time buckets (82  s)

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March “progress” since January High voltage problems in the field cage HV distribution have been greatly reduced. The LabView readout control is more efficient and now writes to a binary file. (L Fields) The CAEN HV system is now interfaced to the LABVIEW. (P. Onyisi) HV trips now stop the data taking. We have taken sufficient data to measure hit resolutions. (follows) We have mounted a GEM gas-amplification stage in the TPC. (G. Bolla) Increased shielding of the signal cables has reduced noise from about +/- 0.5 mV to +/- 0.1 mV. This improves our sensitivity to low signals. (The noise is now ~ 4 counts.) The events displays show that the chamber works. However, progress in comparing amplification technologies is limited until we expand the readout capability.

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March hit resolution, wire amplification find tracks - require coincident signals in 6 layers locate maximum PH pad in each layer find PH center using maximum PH pad plus nearest neighbors ( 2 or 3 pads in the “hit” ) require the hit pulse height sum to have 70% of layer pulse height sum require 5 layers with interior hits ( Max. ph pad is NOT on the edge.) fit to a line may eliminate 1 hit with residual > 2.5mm ( Still require 5 layers with interior hits.) refit resolution is ~ 900  m, 0 to 40cm drift

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March single GEM single GEM gas amplification CERN GEM mounted, tested by Purdue Very preliminary, no events. installed 11-March biasing: field cage, -20kV, 300 V/cm termination: -900V GEM voltage: -420V (GEM bottom: at ground) pads: V Electric field: field termination – GEM top: 0.5 cm, 0.96 kV/cm induction gap: 0.3 cm, 5 kV/cm

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March Linear Collider Detector R&D Proposal The current round of joint DOE/NSF Linear Collider detector R&D funding had project proposals due: 21-January These proposal are presently in review. DOE/NSF action expected in May-2005 Our project requests: Cornell: first year expanded readout new preamps positive HV supply instrumentation for ion feedback measurements gas Purdue: student support

D. Peterson, “The Cornell/Purdue TPC”, LCWS05, Stanford, 21-March Next 1 year Cornell: Expand the readout system; implement rows of small pads. ( Large pads, similar to the present pads, will be used for track definition.) Compare GEM, MicroMegas, and Wires within the same TPC. Compare multiple assemblies of “identical” gas-amplification stages. The present wire gas-amplification, with 20  m wire and 5mm anode-to-pad distance, requires an anode-pad potential of 2550V. We will construct a new wire stage with 8  m wire and 3mm anode-to-pad, which can be operated at lower potential. Measure resolution vs. drift distance, details of biasing, gas, ( location on pad ). Measure ion feedback with the various gas-amplification stages. Purdue: Mount and test single, double, triple GEM, and MicroMegas on standard pad boards. We have installed a single CERN GEM. A 3M MicroMegas is next. Carleton: The Carleton group (Alain Bellerive and Madhu Dixit) will prepare gas-amplification devices on the Cornell readout board for mounting in the Cornell/Purdue TPC. This will include resistive charge dispersion read-out stages. The groups will share in data-taking and developing a common analysis.