Target tests for the ILC positron source Talk presented at the International Workshop on Future Linear Colliders (LCWS2023)

TL;DR

This paper discusses testing titanium alloy Ti-6Al-4V as a target material for the ILC positron source, focusing on its structural stability under high-energy irradiation conditions.

Contribution

It presents experimental results on the irradiation effects on Ti-6Al-4V, demonstrating its potential suitability for high-load positron target applications in the ILC.

Findings

Minimal change in phase fractions after irradiation

Structural stability of Ti-6Al-4V under high-energy X-ray exposure

Supports the material's use in high-intensity positron sources

Abstract

The positron source is an essential component of the International Linear Collider (ILC) and is an area that poses some design challenges. One consideration is the material for the target, where the 1014 positrons per second for the ILC are generated. The potential material would need to be able to resist the high load created by the intense high energy photon beam. One of such candidates is the titanium alloy Ti-6Al-4V, for which the results of material tests with 3.5 MeV electrons are shown. The material was characterized after the irradiation by high-energy X-ray diffraction (HE-XRD) and changes caused by the irradiation to the crystal structure were studied. These tests revealed there was only minimal change in the phase fractions and crystal structure of the material under conditions as expected for the ILC.