Thermal analysis and cooling structure design of the primary collimator in CSNS/RCS

TL;DR

This paper presents a thermal analysis and cooling structure design for the primary collimator in CSNS/RCS, aiming to ensure reliability and safety under high beam power conditions.

Contribution

It introduces a novel cooling structure design and thermal stress analysis for the primary collimator using ANSYS, optimizing cooling efficiency and estimating fatigue lifetime.

Findings

Optimal cooling structure with specific chin numbers and wind velocity improves thermal management.

Thermal stress levels are maintained within safe limits through the proposed cooling design.

Estimated fatigue lifetime indicates the collimator's durability under thermal shocks.

Abstract

The rapid cycling synchrotron (RCS) of the China Spallation Neutron Source (CSNS) is a high intensity proton ring with beam power of 100 kW. In order to control the residual activation to meet the requirements of hands-on maintenance, a two-stage collimation system has been designed for the RCS. The collimation system consists of one primary collimator made of thin metal to scatter the beam and four secondary collimators as absorbers. Thermal analysis is an important aspect in evaluating the reliability of the collimation system. The calculation of the temperature distribution and thermal stress of the primary collimator with different materials is carried out by using ANSYS code. In order to control the temperature rise and thermal stress of the primary collimator to a reasonable level, an air cooling structure is intended to be used. The mechanical design of the cooling structure is presented, and the cooling effciency with different chin numbers and wind velocity is also analyzed. Finally, the fatigue lifetime of the collimator under thermal shocks is estimated.