High power density test of PXIE MEBT absorber prototype

TL;DR

This paper reports on the high power density testing of PXIE MEBT absorber prototypes made from TZM alloy, demonstrating their ability to withstand 17W/mm2 surface power density with temperature and flow analysis.

Contribution

It presents the design, fabrication, and testing results of two TZM alloy absorber prototypes for high power density beam absorption in PXIE.

Findings

Absorbers withstood 17W/mm2 power density without failure.

Temperature and flow measurements matched analysis predictions.

Prototypes demonstrate feasibility for high power beam absorption.

Abstract

One of the goals of the PXIE program at Fermilab is to demonstrate the capability to form an arbitrary bunch pattern from an initially CW 162.5 MHz H- bunch train coming out of an RFQ. The bunch-by-bunch selection will take place in the 2.1 MeV Medium Energy Beam Transport (MEBT) by directing the undesired bunches onto an absorber that needs to withstand a beam power of up to 21 kW, focused onto a spot with a ~2 mm rms radius. Two prototypes of the absorber were manufactured from molybdenum alloy TZM and tested with a 28 keV DC electron beam up to the peak surface power density required for PXIE, 17W/mm2. Temperatures and flow parameters were measured and compared to analysis. This paper describes the absorber prototypes and key testing results.