Title :
Reduction of the photoelectron yield from a copper beam chamber by saw-tooth machining
Author :
Suetsugu, Y. ; Tanimoto, Y. ; Hori, Y. ; Kanazawa, K. ; Kobayashi, M. ; Hsu, Y.J.
Author_Institution :
KEK, Tsukuba, Japan
Abstract :
One of the latest serious problems for KEKB is a beam size blow up of the positron beam. The blow up is considered to be caused by a single-beam instability due to an electron cloud around the positron beam. The seed of the electrons is mainly photoelectrons emitted from the surface of vacuum chamber. Here a surface with a sawtooth structure is proposed to reduce the photoelectron yield. Experiments using a test chamber made of copper verify its validity
Keywords :
X-ray photoelectron spectra; copper; electron accelerators; particle beam stability; storage rings; vacuum apparatus; Cu; KEKB; beam chamber; beam size blow up; electron cloud; electron storage ring; photoelectron yield reduction; positron beam; sawtooth machining; single-beam instability; test chamber; vacuum chamber; Clouds; Copper; Electrodes; Electron beams; Electron emission; Machining; Positrons; Strontium; Teeth; Testing;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987315
