Title
| Spectrographic Approach to Study of RF Conditioning Process in Accelerating RF Structures |
Author(s)
| Tomizawa, H ; Hanaki, H ; Taniuchi, T |
Affiliation
| (JASRI-SPring-8, Hyogo KEK, Ibaraki) |
Publication
| 2004 |
In:
| 22nd International Linear Accelerator Conference, Lubeck, Germany, 16 - 20 Aug 2004, pp.471 |
Subject category
| Accelerators and Storage Rings |
Abstract
| The acceleration gradient of a linac is limited by rf breakdown in its accelerating structure. We applied an imaging spectrograph system to study the mechanism of rf breakdown phenomena in accelerating rf structures. Excited outgases emit light during rf breakdown, and the type of outgases depend on surface treatments and rinsing methods for their materials. To study rf breakdown, we used 2-m-long accelerating structures and investigated the effects when high-pressure ultrapure water rinsing (HPR) treatment was applied to these rf structures. We performed experiments to study the outgases under rf conditioning with quadruple mass spectroscopy and imaging spectrography. As a result, we could observe instantly increasing signals at mass numbers of 2 (H<sub><font size="-1">2 |