TUCOYBS01
KEK, Ibaraki, Japan
KEK, Ibaraki, Japan
Sokendai - Hayama, Hayama, Japan
Sokendai, Ibaraki, Japan
WECOWBS01
KEK, Ibaraki, Japan
| Paper | Title | Page |
|---|---|---|
TUCOYBS01 |
KEK ERL SRF Operation Experience | |
|
||
| We will present the SRF operation experience during long-term cERL operation in KEK. | ||
|
|
Slides TUCOYBS01 [8.289 MB] | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
| TUCOZBS04 | Characterization of Microphonics in the cERL Main Linac Superconducting Cavities | 48 |
|
||
| In the main linac (ML) of the KEK-cERL, two superconducting cavities with high loaded Q (QL ¿ 1×107) are operated in continuous wave (CW) mode. It is important to control and suppress the microphonics detuning owing to the low bandwidth of the cavities. We evaluated the background microphonics detuning by the low level radio frequency system during the beam operation. Interestingly, a ¿field level dependence microphonics¿ phenomenon was observed on one of the cavities in the ML. Several frequency components were suddenly excited if the cavity field is above a threshold field (~3 MV/m). We found that this threshold field is probably related with the cavity quench limits despite the unclear inherent physical mechanism. Furthermore, in order to optimize the cavity resonance control system for better microphonics rejection, we have measured the mechanical transfer function between the fast piezo tuner and cavity detuning. Finally, we validated this model by comparing the model response with actual system response. | ||
|
|
Slides TUCOZBS04 [7.564 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOZBS04 | |
| About • | paper received ※ 13 September 2019 paper accepted ※ 01 November 2019 issue date ※ 24 June 2020 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
WECOWBS01 |
Vertical Test Results and Preparation for Horizontal Test of the KEK SRF Gun #2 | |
|
||
| Superconducting electron guns can realize high acceleration voltage and high beam repetition. KEK has been developing the 1.3 GHz elliptical type 1.5 cell superconducting RF gun to investigate fundamental performance. The surface cleaning methods and tools were developed by using KEK SRF gun cavity #1 and surface peak electric field reached to 75 MV/m without field emission. We will apply this technique to the SRF gun cavity #2 for beam operation. The gun cavity #2 equips the helium jacket, frequency tuner cathode position adjuster to operate the electron beam. The RF structure was designed based on the gun cavity #1. The cathode rod is made of Nb. The photocathode deposited on the cathode rod will be cool down to 2K to minimize thermal emittance. The fabrication of the gun cavity #2 and helium jacket were completed. 4 times vertical tests were carried out. We will report the vertical test results and preparation of the horizontal test. | ||
|
|
Slides WECOWBS01 [18.108 MB] | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |