Preliminary Study on the RF tuning of CSNS DTL

TL;DR

This paper reports on the initial RF tuning process of the CSNS DTL, demonstrating how fine adjustments of tuners achieved the desired field profile and stability for reliable accelerator operation.

Contribution

It presents the first RF tuning results of the CSNS DTL, highlighting the tuning procedures and achieved field flatness and stability.

Findings

Field flatness less than 2% achieved

Field stability below 1% attained

Successful tuning with slug tuners and post couplers

Abstract

In the R&D of the CSNS Drift Tube Linac (DTL), the first unit tank with 28 drift tubes has been developed. The axial accelerating field is ramped from 2.2MV/m to 3.1MV/m in this tank. The required field flatness is less than 2 % with the standard deviation of 1 % for the beam dynamics. And the field stability should be less than 1% for machine stable operation. After the successful alignment, the RF tuning was carried out focusing on the field profile measurement. Four slug tuners and 11 post couplers were applied in this procedure. The ramped filed and required stability had been achieved by fine adjustment of the slug tuners and post couplers. In this paper, the preliminary tuning results are presented and discussed.