# Design, fabrication and high-gradient tests of X-band choke-mode structures

## TL;DR

This paper reports on the design, fabrication, and high-gradient testing of X-band choke-mode structures, comparing their performance to non-choked structures to understand breakdown phenomena at high power levels.

## Contribution

It introduces novel choke-mode structures for X-band applications and provides experimental data on their high-gradient performance and breakdown behavior.

## Key findings

- Choke-mode structures can operate at high gradients with specific breakdown characteristics.
- Comparison shows choke affects high-gradient properties significantly.
- High power tests demonstrate the effectiveness of choke design in high-gradient operation.

## Abstract

Two standing-wave single-cell choke-mode damped structures with different choke dimensions which worked at 11.424 GHz were designed, manufactured and tuned by accelerator group in Tsinghua University. High power test was carried out to study choke-mode structure's properties in high gradient and related breakdown phenomenon. A single-cell structure without choke which almost has the same inner dimension as choke-mode structure was also tested as a comparison to study how the choke affects high-gradient properties. In this paper, we report on the latest status of the high power test, including various observations and the experimental results.