Description
Conveners:M.Winter, HB. Park, D.Karlen, B.Schumm
We will have a short break around 15:30.
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Dean Karlen21/04/2004, 14:00A prototype TPC with GEM readout was operated in axial magnetic fields for the first time at TRIUMF and DESY in the summer of 2003. Results from an updated analysis of cosmic ray tracks recorded with this device will be shown. Plans for further tests with the prototype TPC will be presented.Go to contribution page
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P. Wienemann (DESY)21/04/2004, 14:20One possible option for the main tracking device of a detector at a future Linear Collider is a large Time Projection Chamber (TPC). To replace the traditional wire based gas amplification system of a TPC, so called Micro Pattern Gas Detectors (MPGDs) are considered a good choice. One example of such a MPGD is the Gas Electron Multiplier (GEM). At DESY a prototype TPC equipped with GEMs has...Go to contribution page
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Jochen Kaminski21/04/2004, 14:35In order to study whether a TPC in combination with a Micro Pattern Gas Amplification stage can meet the demands of future Linear Collider central tracking systems, a small cylindrical TPC Prototype was built in Karlsruhe and equipped with two GEMs and highly-integrated front-end electronics. The studies imply two beam tests at the Proton-Synchrotron (PS) at CERN as well as a test in a...Go to contribution page
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Ron Settles21/04/2004, 14:50The LC TPC prototype built and commissioned at MPI-Munich is equipped with wire gas amplification now and is foreseen to also be modified for the Gem and Micromegas (MPGD) technologies. The chamber was transferred to Desy for testing with cosmics and lasers in the 5T magnet and with the readout electronics there. It will then be shipped to KEK for continuation of this series of measurements...Go to contribution page
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Vincent Lepeltier21/04/2004, 15:05We present first results on magnetic field tests of a Micromegas TPC using cosmic rays. The large-area TPC prototype (1024 channels, 50 cm drift and 50 cm diameter) has been in operation since July 2003 at Saclay. Results from data taken in November 2003 for both Ar-Isobutane and Ar-CF4 mixtures at various magnetic field settings will be shown.Go to contribution page
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21/04/2004, 15:25
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Jan Timmermans21/04/2004, 15:35An 'ideal' readout scheme of a TPC would consist of gas multiplication by either one or more GEM or Micromegas foils, followed by a charge collection device with a granularity corresponding to the primary ionisation cluster spread (and assuming sufficiently low diffusion). A readout channel with granularity similar to the 'grid' size in GEM and Micromegas foils has been realised, as a first...Go to contribution page
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Kirsten Sachs21/04/2004, 15:50If a TPC will be used as central detector at a high energy linear collider the spatial resolution must be improved. Charge amplification with micro pattern gas detectors (MPGD), such as GEMs and Micromegas, will eliminate large systematic effects inherent in the conventional proportional wire cathode pad readout TPC. However, the transverse confinement of the spatial charge in a magnetic field...Go to contribution page
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Astrid Muennich21/04/2004, 16:10In the framework of our studies of a GEM readout for a TPC at a Future Linear Collider we present studies on charge broadening effects and the shape of the cluster charge as a function of the magnetic field. Results of measurements with a test chamber in fields up to 5 T will be shown. For further studies a TPC is being built which is designed to fit into the 5T magnet at DESY. Numerical...Go to contribution page
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Michael Weber21/04/2004, 16:25A critical factor in the design of a TPC for a Linear Collider is the amount of ions drifting back into the sensitive volume. To reduce this ion feedback, multi-GEM-structures are used, which further improve the intrinsic ion feedback suppression of single GEM foils. To optimize the operational parameters of such a structure extensive simulations have been performed. The simulations have been...Go to contribution page
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Alexander Vasiljev21/04/2004, 16:40The unique advantage of He-based mixtures is that the ion mobilities in He are almost by an order of magnitude higher than that in Ar. Accordingly, using the He-based mixtures could help to solve the problem of ion accumulation in the TPC volume. On the other hand, the unique advantage of GEMs is that they can operate at high gains in pure noble gases, in particular in He and its mixtures with...Go to contribution page
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Norik Khalatyan21/04/2004, 16:50In the past 10 years, we have been developing a mini-jet cell type cylindrical drift chamber as a central tracker for a warm cavity future linear collider. This talk will summarize our activities including developments made since the Jeju meeting.Go to contribution page