TY - CPAPER AU - Schreiber, S. AU - Lederer, S. TI - Lifetime of Cs2Te Cathodes Operated at the FLASH Facility J2 - Proc. of FEL2015 AB - The injector of the free-electron laser facility FLASH at DESY (Hamburg, Germany) uses Cs2Te photocathodes. We report on the lifetime, quantum efficiency (QE), and darkcurrent of photocathodes operated at FLASH during the last year. Cathode 618.3 has been operated for a record of 439 days with a stable QE in the order of 3%. The fresh cathode 73.3 shows an enhancement of emitted electrons for a few microseconds of a 1 MHz pulse train. PB - JACoW CY - Geneva, Switzerland SP - 464 EP - 467 KW - laser KW - cathode KW - gun KW - operation KW - electron DA - 2015/12 PY - 2015 SN - 978-3-95450-134-2 DO - 10.18429/JACoW-FEL2015-TUP042 UR - http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup042.pdf ER -