Beam Dynamics Studies at the PIP-II Injector Test Facility

TL;DR

This paper reports on beam dynamic measurements at PIP2IT, validating beam behavior predictions through experimental data and simulations, crucial for the development of the PIP-II linac front-end.

Contribution

It provides comprehensive beam dynamics measurements and compares them with Tracewin simulations, enhancing understanding of beam behavior at PIP2IT.

Findings

Measured Twiss parameters match simulations

Beam envelopes are consistent with predictions

Emittance reconstructions validate beam quality models

Abstract

A series of beam dynamic studies were performed in 2020-2021 at the PIP-II Injector Test Facility (PIP2IT) that has been built to validate the concept of the front-end of the PIP-II linac being constructed at Fermilab. PIP2IT is comprised of a 30-keV H- ion source, a 2 m-long Low Energy Beam Transport (LEBT), a 2.1- MeV CW RFQ, followed by a 10-m Medium Energy Beam Transport (MEBT), 2 cryomodules accelerating the beam to 16 MeV and a High-Energy Beam Transport (HEBT) bringing the beam to a dump. This paper presents beam dynamics - related measurements performed at PIP2IT such as the Twiss parameters with Allison scanners, beam envelopes along the injector, and transverse and longitudinal rms emittance reconstruction. These measurements are compared with predictions from the beam dynamics code Tracewin.