Operation of the 56 MHz superconducting rf cavity in RHIC with higher order mode damper
A 56 MHz superconducting rf cavity was designed and installed in the Relativistic Heavy Ion Collider (RHIC). It is the first superconducting quarter wave resonator (QWR) operating in a high-energy storage ring. We discuss herein a design of the cavity and its key components and the cavity operation with Au+Au collisions, and with asymmetrical Au+He3 collisions. The cavity is a storage cavity, meaning that it becomes active only at the energy of the experiment, after the acceleration cycle is completed. Without beam, the cavity reached 1.93 MV and a Q0 of 3.0×108 after helium conditioning. The cavity voltage was limited at 300 kV with beam operation due to heating in the Higher Order Mode (HOM) coupler. With the cavity operating at 300 kV, an improvement in luminosity was detected from direct measurements, and the bunch length has been reduced. The uniqueness of the QWR necessitated development of an innovative design of the higher order mode dampers with high-pass filters, and a distinctive fundamental mode damper that enables the cavity to be transparent to the beam during acceleration.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)
- Grant/Contract Number:
- SC0012704; AC02-07CH11359; AC02-98CH10886
- OSTI ID:
- 1572215
- Alternate ID(s):
- OSTI ID: 1457540; OSTI ID: 1572359
- Report Number(s):
- arXiv:1805.01531; FERMILAB-PUB-18-175-TD; BNL-212276-2019-JAAM; PRABCJ; 102001
- Journal Information:
- Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 22 Journal Issue: 10; ISSN 2469-9888
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Evidence for surface‐state‐enhanced field emission in rf superconducting cavities
|
journal | February 1974 |
Superconducting Resonators for the University of Washington Booster Linac
|
journal | October 1985 |
Suppressing multipacting in a 56 MHz quarter wave resonator
|
journal | May 2010 |
Similar Records
The first operation of 56 MHz SRF cavity in RHIC
Quench propagation in the HOM damper of the 56 MHz cavity