12th International Workshop on the Mechanisms of Vacuum Arcs (MeVArc 2025)

Session

Applications

5 Jun 2025, 09:00

Conveners

Applications

• Flyura Djurabekova

Applications

• Bruno Balhan (CERN)

30. Post-arc Current of Forced-current-zero Vacuum Arcs

Prof. Shenli Jia (Xi'an Jiaotong University)

05/06/2025, 09:00

Oral

Vacuum circuit-breakers (VCBs) are commonly applied in mechanical type direct current circuit-breakers (DCCBs). A high frequency (HF) current is injected to help create a forced current zero (CZ) and facilitates DC interruption in these DCCBs. This work is focused on investigation of the forced-current-zero vacuum arc and the following post-arc current.

A circuit capable of producing high...

59. Development of a high-gradient thermionic electron gun for a future X-ray free-electron laser

Dr Kazuaki Togawa (RIKEN SPring-8 Center)

05/06/2025, 09:30

Oral

The 500-kV pulsed DC thermionic electron gun with a single-crystal CeB6 cathode is being used for the X-ray free-electron laser (XFEL) SACLA in Japan. In order to increase brightness of the gun beam for higher XFEL output, we are developing high-gradient accelerating electrodes to increase the surface and gap electric fields because they are indispensable to increase emission density of the...

15. Electron emission behavior at small gaps in vacuum interrupters

Dr Erik Taylor

05/06/2025, 10:00

Oral

The contact gap of open vacuum interrupters (VI) is generally set by the lightning impulse withstand voltage and/or capacitor switching duty. These duties require larger contact gaps than other duties such as interrupting short-circuit current and power frequency withstand voltage. The electron emission from gaps with these dimensions is very small, unless some feature of the duty enhances...

67. High gradient RF activities in SXFEL

Cheng Wang

05/06/2025, 11:00

Oral

The Shanghai X-ray Free Electron Laser (SXFEL) has entered scientific operation. As the main accelerator, the C-band linac currently operates at an average gradient of 37.1 MV/m, achieving a peak gradient of 41.7 MV/m in one unit. However, the existing linear section length is insufficient to meet future energy upgrade requirements under this gradient regime. To address this limitation,...