Title :
Ion feedback suppression using inclined MCP holes in a "single-MCP+Micromegas+pads" detector
Author :
Va´Vra, J. ; Sumiyoshi, T.
Author_Institution :
Stanford Linear Accel. Center, USA
Abstract :
We show that the ion backflow to photocathode can he completely suppressed if one uses inclined MCP holes in a presence of magnetic field. The inclined hole angles are chosen to be aligned with the Lorentz electron angle allowing the electron transmission and amplification, while positive ions, traveling along a different angle, are caught on the MCP hole walls. The detector under investigation is a new gaseous detector structure based on a tandem of two parts, the first one is a single MCP (microchannel) plate, and the second one is a Micromegas with pad readout. The paper compares relative merits of gaseous and vacuum-based MCP detectors. We are aiming to develop a gaseous detector with the bialkali photocathode.
Keywords :
microchannel plates; nuclear electronics; photocathodes; position sensitive particle detectors; readout electronics; Lorentz electron angle; MCP hole walls; bialkali photocathode; electron amplification; electron transmission; gaseous MCP detector; inclined MCP holes; inclined hole angles; ion feedback suppression; magnetic field; microchannel plate; pad readout; single-MCP+Micromegas+pads detector; vacuum-based MCP detector; Cathodes; Charge carrier processes; Detectors; Electron emission; Face detection; Feedback; Geometry; Magnetic fields; Microchannel; Research and development;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2004 IEEE
Print_ISBN :
0-7803-8700-7
Electronic_ISBN :
1082-3654
DOI :
10.1109/NSSMIC.2004.1462404
