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Achieving High Resolution with GEM and Micromegas in TPC R&D at Carleton University

Explore the research and development of Time Projection Chambers (TPC) in Canada, focusing on track angle systematics, ExB effects, and pad response optimization. Learn about achieving 100 µm resolution with Gas Electron Multiplier (GEM) technology and new ideas for improving space-point resolution. Discover advancements in cosmic ray tracking studies and operating parameters for TPC readout with high magnetic fields. The goal is to enhance the resolution for a proposed 500 GeV linear collider with micro-pattern detectors (MPGD) readout, impacting detector design and physics reach significantly.

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Achieving High Resolution with GEM and Micromegas in TPC R&D at Carleton University

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  1. Linear Collider TPC R&D in Canada Madhu Dixit Carleton University

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  5. ExB & track angle systematics in a TPC(Aleph TPC example) TPC wire/pad readout ExB cancels track angle effect 100 µm Average Aleph resolution ~ 150 µm About 100 µm best for all drift distances Limit from diffusion  (10 cm drift) ~ 15 µm;  (2 m drift) ~ 60 µm 100 µm limit for all drift distances comes from wide pad response M. Dixit

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  9. TPC read out with a Gas Electron Multiplier (GEM*) * F. Sauli, NIM A386,531 (1997) GEM spatial resolution ~ 40 µm with 200 µm pitch anodes Impractical for a TPC TPC pad widths ~ mm All charge on a single pad for a TPC in high B field Difficult centroid finding Resolution ~ Pad width/√12 How to find charge centroid in a GEM? • Zigzag shape makes chevrons share charge between pads to facilitate centroid finding • Optimize readout geometry and diffusion to do the best with rectangular pads • Where is the induced signal on the neighboring pads? M. Dixit

  10. MPGD-TPC R&D in Canada - Goals • New ideas to get good space-point resolution from ~ mm wide pads • Studies with a GEM & Micromegas test cells using collimated x-rays • Limits to achievable resolution by with conventional techniques by optimizing geometry and gas diffusion • 15 cm drift TPC with GEM readout • Operating parameters • Cosmic ray tracking studies • Assess the performance of MPGD-TPC in a test beam and in a high magnetic field • (r-) ~ 70 µm within reach with R&D, M. Dixit

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  14. Pads centroid from induced signals in a GEM GEM Proportional wire Anode pads Cathode pads Short ~ 200 ns signal Wire/pad readout electronics won’t work! Need fast high frequency pulse shape sampling electronics M. Dixit

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  16. Resistive anode GEM test cell setup M. Dixit

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  20. Outlook & summary • Consensus for a 500 GeV e+ e- linear collider within this decade - proposals in Europe & in the US & Japan • A micro-pattern detector (MPGD) readout TPC is being be developed for the LC detector with resolution and 2 track resolving power approaching diffusion limits • Better MPGD-TPC resolution has a significant impact on the design of the LC detector design and its physics reach M. Dixit

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