24-28 February 2020
Budker Institute of Nuclear Physics
Asia/Novosibirsk timezone

Performance of the continuous ions suppression TPC prorotype for circular collider

25 Feb 2020, 15:20
remote (zoom)



Contributed Oral Tracking and vertex detectors Tracking and vertex detectors


Dr HUIRONG QI (Institute of High Energy Physics, CAS)


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)

Presentation Materials