Comparison of coaxial higher order mode couplers for the CERN Superconducting Proton Linac study
K. Papke, F. Gerigk, U. van Rienen
DOI 10.1103/PhysRevAccelBeams.20.060401 · Physical Review Accelerators and Beams
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Higher order modes (HOMs) may affect beam stability and refrigeration requirements of superconducting proton linacs such as the Superconducting Proton Linac, which is studied at CERN. Under certain conditions beam-induced HOMs can accumulate sufficient energy to destabilize the beam or quench the superconducting cavities. In order to limit these effects, CERN considers the use of coaxial HOM couplers on the cutoff tubes of the 5-cell superconducting cavities. These couplers consist of resonant antennas shaped as loops or probes, which are designed to couple to potentially dangerous modes while sufficiently rejecting the fundamental mode. In this paper, the design process is presented and a comparison is made between various designs for the high-beta SPL cavities, which operate at 704.4 MHz. The rf and thermal behavior as well as mechanical aspects are discussed. In order to verify the designs, a rapid prototype for the favored coupler was fabricated and characterized on a low-power test-stand.
Similar papers
Influence of higher order modes on the beam stability in the high power superconducting proton linac
similarity 0.89Marcel Schuh et al.
Source status unknown — claims are unverified
Conceptual design of a sapphire loaded coupler for superconducting radio-frequency 1.3 GHz cavities
similarity 0.84Chen Xu & Sami Tantawi
Source status unknown — claims are unverified
Low- and intermediate-β, 352 MHz superconducting half-wave resonators for high power hadron acceleration
similarity 0.83A. Facco et al.
Source status unknown — claims are unverified
Superconducting CH structure
similarity 0.81H. Podlech et al.
Source status unknown — claims are unverified
Fast microwave beam splitters from superconducting resonators
similarity 0.81M. Haeberlein et al. · 2013 · arXiv:1302.0729
Source status unknown — claims are unverified
Cryogenic Microwave Filter Cavity with a Tunability Greater than 5 GHz
similarity 0.81T. J. Clark et al. · 2018 · arXiv:1810.02404
Source status unknown — claims are unverified