A Fast High-Voltage Switching Multiwire Proportional Chamber
  A new experiment, called DeeMe, which is designed to search for $\mu$-e conversions with a sensitivity of $\mathcal{O}(10^{-14})$, is in preparation at the Japan Proton Accelerator Research Complex (J-PARC). It utilizes a high-quality pulsed proton beam from the Rapid Cycling Synchrotron at J-PARC. The detector for DeeMe must tolerate large pulses of prompt charged particles whose instantaneous hit rate is as large as 70 GHz/mm$^2$ in a time width of 200 ns and detect a single electron that arrives with delayed timing on the order of microseconds. A special wire chamber has been developed with a new dynamic gain control technique that reduces space charge effects. In this paper, we detail the novel detector scheme and operation verification. 
H. Natori, N. Teshima, M. Aoki, H. Nishiguchi, T. D. Nguyen, Y.   Takezaki, Y. Furuya, S. Ito, S. Mihara, D. Nagao, Y. Nakat...
physics.ins-det hep-ex nucl-ex