Abstract
To improve RHIC luminosity for heavy ion beam energies below 10 GeV/nucleon, the Low Energy RHIC electron Cooler (LEReC) is currently under commissioning at BNL. The Linac of LEReC is designed to deliver a 1.6 MeV to 2.6 MeV electron beam, with rms dp/p less than 5e-4. A 704 MHz superconducting radio frequency (SRF) booster cavity in this Linac provides up to 2.2 MeV accelerating voltage. With such a low energy and very demanding energy spread requirement, control of Higher Order Modes (HOMs) in the cavities becomes critical and needs to be carefully evaluated to ensure minimum impact on the beam. In this paper, we report the multiphysics design of the HOM damper for this cavity to meet the energy spread requirement, as well as experimental results of the cavity with and without the HOM damper.
Highlights
To map the QCD phase diagram, especially to search for the QCD critical point using the Relativistic Heavy Ion Collider (RHIC), a significant luminosity improvement at energies below 10 GeV=nucleon is required. This can be achieved with the help of an electron cooling upgrade called the Low Energy RHIC electron Cooler (LEReC) [1]
The electron accelerator for the LEReC consists of a dc photoemission gun and a 704 MHz superconducting radio frequency (SRF) booster cavity
The booster cavity for LEReC was converted from the SRF photocathode gun of the energy recovery linac (ERL) project [2]
Summary
To map the QCD phase diagram, especially to search for the QCD critical point using the Relativistic Heavy Ion Collider (RHIC), a significant luminosity improvement at energies below 10 GeV=nucleon is required. This can be achieved with the help of an electron cooling upgrade called the Low Energy RHIC electron Cooler (LEReC) [1]. The electron accelerator for the LEReC consists of a dc photoemission gun and a 704 MHz superconducting radio frequency (SRF) booster cavity. The very low energy and small energy spread requirement make it important to control the higher order modes (HOMs) in these cavities, especially the 704 MHz SRF booster cavity. The booster cavity was cryogenically tested without and with the HOM damper, and the results are reported in this paper
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