Speaker
Dr
HUIRONG QI
(Institute of High Energy Physics, CAS)
Description
The circumference of CEPC(Circular Electron Positron Collider) is 100km, with two interaction points available for exploring
different detector design scenarios and technologies. Two common RF stations are deployed for the Higgs operation, which result in
286 beam bunches evenly distributed over a half ring. While for W and Z operations, independent RF cavities are used, 5220 and 10900
bunches are spreading in equal distance over the full ring, respectively. Therefore, the bunch spacing are about 500ns, 50ns and 30ns
for Higgs, W and Z operations, respectively. Aiming for the CDR and TDR of the CEPC project, the feasibility study of TPC tracker
detector was initiated for the purpose to identify feasible technology options and to gain expertise to build the detector units
which meet the basic requirements of the CEPC detector design. The TPC detector at the proposed circular collider will have to be
operated continuously and the backflow of ions must be minimized without the open/close time of a gating device technology. The gain
of the selection detector module can be achieved up to about 5000 without any obvious discharge behaviour. The currents on the anode
and drift cathode were measured precisely with an electrometer. The experimental results showed that IBF can be reduced to less than
0.1% at the specific gain. All update IBF results have been compared with ALICE TPC option and DMM(Double Mesh Micromegas) using 55Fe
and X-ray tube. The future R&D has been mentioned to meet the high luminosity at Z.
Primary author
Dr
HUIRONG QI
(Institute of High Energy Physics, CAS)
