Lifetime-extended MCP-PMT
نویسندگان
چکیده
In order to develop a long-lifetime MCP-PMT under high rates of circumstance, we investigated the degradation of the quantum efficiency (QE) of PMT’s with a multialkali photocathode. We found that not only positive ions, but also neutral residual gases would damage the photocathode resulting in an enhancement of the work function; their countermeasures were established in newly manufactured square-shapedMCP-PMT’s with 4 or 4 4multi-anodes. The performances of the PMT’s were measured: QEwas stable up to an integrated amount of anode output charge of 2–3 C/cm, while keeping other basic performances steady, such as the time resolution for single photons (sTTS) of C40 ps, a photoelectron collection efficiency (CE) of 60%, a multiplication gain (G) of a few 10, and dark counts of 20–300 Hz. The causes of QE degradation are discussed. & 2010 Elsevier B.V. All rights reserved.
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