Mechanical Design of a High Energy Beam Absorber for the Advanced Superconducting Test Accelerator (ASTA) at Fermilab

TL;DR

This paper details the mechanical and thermal design of a high energy beam absorber for Fermilab's ASTA, capable of handling 75kW beams up to 1.5GeV, including analysis of thermal performance and radiation effects.

Contribution

It introduces a novel mechanical design for high power beam absorbers with detailed thermal analysis and radiation durability considerations.

Findings

Successful thermal management in the absorber design.

Assessment of graphite radiation resistance.

Design accommodates up to 75kW beam power.

Abstract

A high energy beam absorber has been built for the Advanced Superconducting Test Accelerator (ASTA) at Fermilab. In the facility's initial configuration, an electron beam will be accelerated through 3 TTF-type or ILC-type RF cryomodules to an energy of 750MeV. The electron beam will be directed to one of multiple downstream experimental and diagnostic beam lines and then deposited in one of two beam absorbers. The facility is designed to accommodate up to 6 cryomodules, which would produce a 75kW beam at 1.5GeV; this is the driving design condition for the beam absorbers. The beam absorbers consist of water-cooled graphite, aluminum and copper layers contained in a Helium-filled enclosure. This paper describes the mechanical implementation of the beam absorbers, with a focus on thermal design and analysis. In addition, the potential for radiation-induced degradation of the graphite is discussed.