Studies of the superconducting traveling wave cavity for high gradient LINAC

TL;DR

This paper explores the development of a superconducting traveling wave cavity for high-gradient linear accelerators, demonstrating potential for increased acceleration gradients and presenting simulation results on stability factors.

Contribution

It advances the design and testing of a 3-cell superconducting traveling wave cavity, including simulation studies on microphonics and Lorentz Force Detuning effects.

Findings

TW cavities achieve 1.2-1.4 times higher gradient than TESLA cavities.

Single-cell tests show gradients comparable to ILC-type cavities.

Simulation results provide insights into microphonics and LFD impacts.

Abstract

Use of a traveling wave (TW) accelerating structure with a small phase advance per cell instead of standing wave may provide a significant increase of accelerating gradient in a superconducting linear accelerator. The TW section achieves an accelerating gradient 1.2-1.4 larger than TESLA-shaped standing wave cavities for the same surface electric and magnetic fields. Recent tests of an L-band single-cell cavity with a waveguide feedback demonstrated an accelerating gradient comparable to the gradient in a single-cell ILC-type cavity from the same manufacturer. This article presents the next stage of the 3- cell TW resonance ring development which will be tested in the traveling wave regime. The main simulation results of the microphonics and Lorentz Force Detuning (LFD) are also considered.