Spatial resolutions of GEM TPC. A novel theoretical formula and its comparison to latest beam test data

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Published 3 March 2014 • © 2014 IOP Publishing Ltd and Sissa Medialab srl
, , 3rd International Conference on Micro Pattern Gaseous Detectors Citation R Yonamine et al 2014 JINST 9 C03002 DOI 10.1088/1748-0221/9/03/C03002

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Author affiliations

1 High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801, Japan

2 Siegen University, Walter-Flex-Str. 3, 57068 Siegen, Germany

3 Tohoku University, 6-3 Aoba Aramaki, Sendai 980-8578, Japan

4 Nagasaki Institute of Applied Science (NiAS), 536 Abamachi, Nagasaki 851-0193, Japan

5 Saga University, 1 Honjomachi, Saga 840-8502, Japan

6 Kinki University, 3-4-1 Kowakae, Higashi-Osaka 577-8502, Japan

7 Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan

8 Tokyo University of Agriculture and Technology (TUAT), 2-24-16 Nakamachi, Koganei 184-8588, Japan

9 Max Planck Institute for Physics, Föhringer Ring 6, 80805 Munich, Germany

10 Kogakuin University, 1-24-2 Nishi-Shinjuku, Shinjuku 163-8677, Japan

Dates

  1. Received 18 October 2013
  2. Accepted 6 January 2014
  3. Published

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1748-0221/9/03/C03002

Abstract

Unprecedented charged particle momentum resolution is required for precision Higgs studies at the International Linear Collider (ILC), which in turn demands as many as 200 sampling points with a high spatial resolution of 100 microns or better if we are to adopt a TPC for the central tracker. We discuss a novel theoretical resolution formula for a GEM-readout TPC, which is applicable to inclined tracks as opposed to the previous formula which is valid only for normal incidence. The formula identifies key factors that determine the spatial resolution and helps optimize the readout pad geometry and High Voltage settings for a given gas mixture. The formula is compared to the latest beam test results for a LC TPC Large prototype.

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10.1088/1748-0221/9/03/C03002