Abstract
The Low Energy RHIC electron Cooler (LEReC) is currently under commissioning at BNL to improve RHIC luminosity for heavy ion beam energies below 10 GeV/nucleon. The linac of LEReC consists of a DC photoemission gun, one 704 MHz superconducting radio frequency (SRF) booster cavity, and three normal conducting cavities. It is designed to deliver a 1.6 MeV to 2.6 MeV electron beam, with peak-to-peak momentum spread dp/p of less than 7e4. Two of the three normal conducting cavities will be used in LEReC for energy spread correction. A single-cell 704 MHz cavity for energy de-chirping and a three-cell 2.1 GHz third harmonic cavity for RF curvature correction. In this paper, we present the designs and RF test results of these two cavities.
Highlights
A bunched beam electron cooler called the low energy RHIC electron cooler (LEReC) [1] has been designed and constructed and is under commissioning at the Relativistic Heavy Ion Collider (RHIC) to significantly improve the collider luminosity at energies below 10 GeV=nucleon to map the QCD phase diagram, especially to search for the QCD critical point.The ion beam in RHIC to be cooled consists of 111 bunches plus nine missing bunches for the abort gap, that are evenly distributed in the 3833.84 m circumference, with γ ranging from 4.1 to 6.1
9 MHz refers to the 120th harmonic of the RHIC revolution frequency, ranging from 9.104 to 9.256 MHz in LEReC
It differs from the Next Linear Collider (NLC) shape [10] by the addition of a 40.9 mm straight section at the equator to ease fabrication of the fundamental power coupler (FPC), tuner, vacuum pump, and rf pickup ports
Summary
Cornell University, Ithaca, New York 14853, USA (Received 9 April 2018; published 5 March 2019). The low energy RHIC electron cooler (LEReC) is currently under commissioning at BNL to improve RHIC luminosity for heavy ion beam energies below 10 GeV=nucleon. The linac of LEReC consists of a dc photoemission gun, one 704 MHz superconducting radio frequency booster cavity, and three normal conducting cavities. It is designed to deliver a 1.6–2.6 MeV electron beam, with peak-to-peak momentum spread dp=p of less than Æ7 × 10−4. Two of the three normal conducting cavities will be used in LEReC for energy spread correction: a single-cell 704 MHz cavity for energy dechirping and a three-cell 2.1 GHz third harmonic cavity for rf curvature correction. We present the designs and rf test results of these two cavities
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