Design and test of 704 MHz and 2.1 GHz normal conducting cavities for low energy RHIC electron cooler

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.

[1]  S. Seletskiy,et al.  Beam Optics for the RHIC Low Energy Electron Cooler (LEReC) , 2017 .

[2]  S. Seletskiy,et al.  Accelerator Physics Design Requirements and Challenges of RF Based Electron Cooler LEReC , 2017 .

[3]  A. Fedotov,et al.  HOM Consideration of 704 MHz and 2.1 GHz Cavities for LEReC Linac , 2016 .

[4]  A. Fedotov,et al.  Mechanical Design and 3-D Coupled RF, Thermal-Structural Analysis of Normal Conducting 704 MHz and 2.1 GHz Cavities for LEReC Linac , 2016 .

[5]  Vladimir N. Litvinenko,et al.  A GPU Based 3D Particle Tracking Code for Multipacting Simulation , 2015 .

[6]  K. Perez.  Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2014 .

[7]  D. Ouzounov,et al.  Design and Performance of the Cornell ERL DC Photoemission Gun , 2009 .

[8]  T. Plawski,et al.  Performance of the first refurbished CEBAF cryomodule , 2007, 2007 IEEE Particle Accelerator Conference (PAC).

[9]  P. He.  Secondary Electron Emission Measurements for Tin coating on the Stainless Steel of SNS Accumulator Ring Vacuum Chamber , 2004 .

[10]  Sang-Ho Kim,et al.  Higher-order-mode (HOM) power in elliptical superconducting cavities for intense pulsed proton accelerators , 2002 .

[11]  M. Stirbet,et al.  The fundamental power coupler prototype for the Spallation Neutron Source (SNS) superconducting cavities , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[12]  Bruno W Zotter,et al.  Impedances and Wakes in High-Energy Particle Accelerators , 1998 .