International Workshop on Breakdown Science and High Gradient Technology (HG2018)

Session

Breakdown and Experiments

12

7 Jun 2018, 09:00

Conveners

Breakdown and Experiments

• Jiaru Shi (Tsinghua University)

Description

Lecture Hall

24. Linking breakdown nucleation to critical plastic activity in electrode

Yinon Ashkenazy (The Hebrew University of Jerusalem (IL))

07/06/2018, 09:00

It has long been assumed that breakdown (BD) in vacuum cavities is initiated by field emission from localized surface irregularities causing localized field enhancement. However, the nature of these localized field enhancement region is unknown as of today, and remains as a missing part on the microscopic description of the BD process. This limits the ability to predict breakdown properties of...

41. Theoretical understanding of mechanisms triggering vacuum breakdown

Dr Flyura Djurabekova

07/06/2018, 09:25

Application of electric fields on metal surfaces may be beneficial and detrimental. In our research, we are looking for the changes on the surface, which may lead to vacuum arcing, known to those who are dealing with the high/voltage electronics as electrical breakdowns. These cause problems in many appliances operating in high electric field, such as the Compact Linear Collider (CLIC), a...

28. The Argonne Cathode Test-Stand (ACT) and Its first experiment

Chunguang Jing (Euclid Techlabs LLC/Argonne National Laboratory)

07/06/2018, 09:50

The Argonne Cathode Test-stand (ACT) is a unique testbed to develop cathodes and to conduct fundamental surface study under ultra-high rf field (up to 700 MV/m with pin-shaped cathodes). The test-stand consists of an L-band 1.3 GHz single-cell photocathode rf gun and a field emission (FE) imaging system to locate emitters with a resolution of ~20 um. In the recent upgrade, UV laser has been...

43. Dark current fluctuation measurements in RF structures

Mr Jan Paszkiewicz (University of Oxford (GB))

07/06/2018, 10:15

The dynamics of dislocation activity under intense electric fields has been proposed as a potential cause of breakdowns. In this talk, results of searches for high-frequency fluctuations in field-emitted current that could arise as a consequence of these dynamics are presented for high-gradient RF accelerating structures at CERN. Measurements of spatial profiles of field emission in RF...