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TPC geometry (TDR_o1_v01) update

shexin@ihep.ac.cn requested to merge shexin/CEPCSW:master into master

Updated two new versions of TPC geometry, with the following changes compared to CEPC_v4:

  1. Working gas updated to T2K(Ar/CF4/iC4H10=95/3/2)
  2. Readout updated to Micromegas.
  3. Barrel material updated to carbon fiber (0.55%X0). The layout of these two versions TPC is shown on the following figure. CEPCSW_TPCgeoLayout

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