Title :
Photoemission phenomena on CEBAF RF windows at cryogenic temperatures
Author :
Powers, T. ; Kneisel, P. ; Vaidya, M.
Author_Institution :
Continuous Electron Beam Accel. Facility, Newport News, VA, USA
Abstract :
This paper reports on the photoemission observed during the tests on a single-cell 1500 MHz niobium cavity with a polycrystalline alumina rf interface window operated at 2 K. The light emission from the window at 2 K was detected using a multi-channel fiber optics/PMT system and recorded with a 100 Ms/sec acquisition system. The spectral composition of two types of discharges has been measured. The results indicate that both broadband and narrow-band emissions are present, depending on the discharge type
Keywords :
beam handling equipment; cavity resonators; linear accelerators; niobium; photoemission; 1500 MHz; 2 K; CEBAF RF windows; Nb; broadband emissions; cryogenic temperatures; light emission; multi-channel fiber optics/PMT system; narrow-band emissions; photoemission phenomena; spectral composition; Aluminum oxide; Ceramics; Cryogenics; Electron beams; Niobium; Optical surface waves; Optical waveguides; Photoelectricity; Radio frequency; Temperature;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.308700
