A Study of Beam Alignment Based on Coupling Modes in Third Harmonic Superconducting Cavities at FLASH

P. Zhang; N. Baboi; R.M. Jones

A Study of Beam Alignment Based on Coupling Modes in Third Harmonic Superconducting Cavities at FLASH

P. Zhang, N. Baboi, R.M. Jones

The University of Manchester

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Abstract

This paper presents a study of beam alignment in accelerating cavities based on beam-excited higher order modes (HOM). Among the transverse HOMs, dipole modes have the dominant contribution, and may have an adverse effect on the beam quality. Since they depend linearly on the transverse beam offset, their effect can be reduced by aligning the beam in the cavity. The study has been made on the four third harmonic superconducting cavities installed in the ACC39 module at FLASH. Modes with strong beam coupling were monitored while moving the beam and searching for the minimum excited HOM power.

Original language	English
Title of host publication	host publication
Publication status	Published - 15 Nov 2011
Event	DITANET International Conference: Accelerator Instrumentation and Beam Diagnostics - Seville, Spain Duration: 9 Nov 2011 → 11 Nov 2011

Conference

Conference	DITANET International Conference: Accelerator Instrumentation and Beam Diagnostics
City	Seville, Spain
Period	9/11/11 → 11/11/11

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@inproceedings{e58e7814f14b4845b5fd51892f845dc1,

title = "A Study of Beam Alignment Based on Coupling Modes in Third Harmonic Superconducting Cavities at FLASH",

abstract = "This paper presents a study of beam alignment in accelerating cavities based on beam-excited higher order modes (HOM). Among the transverse HOMs, dipole modes have the dominant contribution, and may have an adverse effect on the beam quality. Since they depend linearly on the transverse beam offset, their effect can be reduced by aligning the beam in the cavity. The study has been made on the four third harmonic superconducting cavities installed in the ACC39 module at FLASH. Modes with strong beam coupling were monitored while moving the beam and searching for the minimum excited HOM power.",

author = "P. Zhang and N. Baboi and R.M. Jones",

note = "Work supported in part by European Commission under the FP7 Research Infrastructures grant agreement No.227579.; DITANET International Conference: Accelerator Instrumentation and Beam Diagnostics ; Conference date: 09-11-2011 Through 11-11-2011",

year = "2011",

month = nov,

day = "15",

language = "English",

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TY - GEN

T1 - A Study of Beam Alignment Based on Coupling Modes in Third Harmonic Superconducting Cavities at FLASH

AU - Zhang, P.

AU - Baboi, N.

AU - Jones, R.M.

N1 - Work supported in part by European Commission under the FP7 Research Infrastructures grant agreement No.227579.

PY - 2011/11/15

Y1 - 2011/11/15

N2 - This paper presents a study of beam alignment in accelerating cavities based on beam-excited higher order modes (HOM). Among the transverse HOMs, dipole modes have the dominant contribution, and may have an adverse effect on the beam quality. Since they depend linearly on the transverse beam offset, their effect can be reduced by aligning the beam in the cavity. The study has been made on the four third harmonic superconducting cavities installed in the ACC39 module at FLASH. Modes with strong beam coupling were monitored while moving the beam and searching for the minimum excited HOM power.

AB - This paper presents a study of beam alignment in accelerating cavities based on beam-excited higher order modes (HOM). Among the transverse HOMs, dipole modes have the dominant contribution, and may have an adverse effect on the beam quality. Since they depend linearly on the transverse beam offset, their effect can be reduced by aligning the beam in the cavity. The study has been made on the four third harmonic superconducting cavities installed in the ACC39 module at FLASH. Modes with strong beam coupling were monitored while moving the beam and searching for the minimum excited HOM power.

M3 - Conference contribution

BT - host publication

T2 - DITANET International Conference: Accelerator Instrumentation and Beam Diagnostics

Y2 - 9 November 2011 through 11 November 2011

ER -

A Study of Beam Alignment Based on Coupling Modes in Third Harmonic Superconducting Cavities at FLASH

Abstract

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