skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Status of the ILC Crab Cavity Development

Abstract

The International Linear Collider (ILC) will require two dipole cavities to 'crab' the electron and positron bunches prior to their collision. It is proposed to use two 9 cell SCRF dipole cavities operating at a frequency of 3.9 GHz, with a transverse gradient of 3.8MV/m in order to provide the required transverse kick. Extensive numerical modelling of this cavity and its couplers has been performed. Aluminium prototypes have been manufactured and tested to measure the RF properties of the cavity and couplers. In addition single cell niobium prototypes have been manufactured and tested in a vertical cryostat. The International Collider (ILC) [1] collides bunches of electrons and positrons at a crossing angle of 14 mrad. The angle between these bunches causes a loss in luminosity due to geometric effects [2]. The luminosity lost from this geometric effect can be recovered by rotating the bunches into alignment prior to collision. One possible method of rotating the bunches is to use a crab cavity [3]. A crab cavity is a transverse defecting cavity, where the phase of the cavity is such that the head and tail of the bunch receive equal and opposite kicks. As the bunches are only 500 nm widemore » in the horizontal plane, the cavity phase must be strictly controlled to avoid the bunch centre being deflected too much. In order to keep the phase stability within the required limits it is required that the cavity be superconducting to avoid thermal effects in both the cavity and its RF source. At the location of the crab cavity in the ILC there is only 23 cm separation between the centre of the cavity and the extraction line, hence the cavity must be small enough to fit in this space. This, along with the difficulty of making high frequency SRF components, set the frequency of the cavity to 3.9 GHz.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1027790
Report Number(s):
SLAC-PUB-14645
TRN: US1105268
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Prepared for 13th International Workshop on RF Superconductivity (SRF 2007), Beijing, China, 14-19 Oct 2007
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ALIGNMENT; ALUMINIUM; CAVITIES; DIPOLES; ELECTRONS; LINEAR COLLIDERS; LUMINOSITY; NIOBIUM; PHASE STABILITY; POSITRONS; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; Accelerators,ACCPHY

Citation Formats

Burt, G, Dexter, A, /Cockcroft Inst. Accel. Sci. Tech., Beard, C, Goudket, P, McIntosh, P, /Daresbury, Bellantoni, L, /Fermilab, Grimm, T, Li, Z, Xiao, L, and /SLAC. Status of the ILC Crab Cavity Development. United States: N. p., 2011. Web.
Burt, G, Dexter, A, /Cockcroft Inst. Accel. Sci. Tech., Beard, C, Goudket, P, McIntosh, P, /Daresbury, Bellantoni, L, /Fermilab, Grimm, T, Li, Z, Xiao, L, & /SLAC. Status of the ILC Crab Cavity Development. United States.
Burt, G, Dexter, A, /Cockcroft Inst. Accel. Sci. Tech., Beard, C, Goudket, P, McIntosh, P, /Daresbury, Bellantoni, L, /Fermilab, Grimm, T, Li, Z, Xiao, L, and /SLAC. 2011. "Status of the ILC Crab Cavity Development". United States. https://www.osti.gov/servlets/purl/1027790.
@article{osti_1027790,
title = {Status of the ILC Crab Cavity Development},
author = {Burt, G and Dexter, A and /Cockcroft Inst. Accel. Sci. Tech. and Beard, C and Goudket, P and McIntosh, P and /Daresbury and Bellantoni, L and /Fermilab and Grimm, T and Li, Z and Xiao, L and /SLAC},
abstractNote = {The International Linear Collider (ILC) will require two dipole cavities to 'crab' the electron and positron bunches prior to their collision. It is proposed to use two 9 cell SCRF dipole cavities operating at a frequency of 3.9 GHz, with a transverse gradient of 3.8MV/m in order to provide the required transverse kick. Extensive numerical modelling of this cavity and its couplers has been performed. Aluminium prototypes have been manufactured and tested to measure the RF properties of the cavity and couplers. In addition single cell niobium prototypes have been manufactured and tested in a vertical cryostat. The International Collider (ILC) [1] collides bunches of electrons and positrons at a crossing angle of 14 mrad. The angle between these bunches causes a loss in luminosity due to geometric effects [2]. The luminosity lost from this geometric effect can be recovered by rotating the bunches into alignment prior to collision. One possible method of rotating the bunches is to use a crab cavity [3]. A crab cavity is a transverse defecting cavity, where the phase of the cavity is such that the head and tail of the bunch receive equal and opposite kicks. As the bunches are only 500 nm wide in the horizontal plane, the cavity phase must be strictly controlled to avoid the bunch centre being deflected too much. In order to keep the phase stability within the required limits it is required that the cavity be superconducting to avoid thermal effects in both the cavity and its RF source. At the location of the crab cavity in the ILC there is only 23 cm separation between the centre of the cavity and the extraction line, hence the cavity must be small enough to fit in this space. This, along with the difficulty of making high frequency SRF components, set the frequency of the cavity to 3.9 GHz.},
doi = {},
url = {https://www.osti.gov/biblio/1027790}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {10}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: