Status of CSNS H- ion source

TL;DR

This paper reports the successful installation and operation of a new H- ion source for CSNS, highlighting design improvements, control system integration, and initial beam performance results.

Contribution

It introduces a compact, improved H- ion source with integrated remote control and demonstrates stable beam production at specified parameters.

Findings

Stable 50 mA H- beam at 50 keV achieved

Remote control system implemented with F3RP61-2L

Design improvements made for compactness and convenience

Abstract

A new H^- ion source has been installed successfully and will be used to serve the China Spallation Neutron Source (CSNS). In this paper, we report various components of the ion source, including discharge chamber, temperature, cooling system, extraction electrodes, analyzing magnet, remote control system and so on. Compared to the previous experimental ion source, some improvements have been made to make the ion source more compact and convenient. In the present arrangement, the Penning field is generated by a pair of pole tip extensions on the analyzing magnet instead of by a separate circuit. For the remote control system, F3RP61-2L is applied to the accelerator online control system for the first time. In the running of the ion source, a stable pulse H- beam with a current of 50 mA at an energy of 50 keV is produced. The extraction frequency and pulse width is 25 Hz and 500microsecond, respectively. Furthermore, an emittance scanner has been installed and measurements are in progress.