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

Title: Observations of Long-Range and Short-Range Wakefield Effects on Electron-Beam Dynamics in TESLA-type SCRF Cavities

Abstract

The Fermilab Accelerator Science and Technology (FAST) facility has a unique configuration of a photocathode rf gun beam injecting two TESLA-type single cavities (CC1 and CC2) in series prior to the cryomodule. Beam propagation off axis in these cavities can result in both long-range and short-range transverse wakefields which can lead to emittance dilution within the macropulses and micropulses, respectively. Two configurations of a Hamamatsu C5680 streak camera viewing a downstream OTR screen were utilized to track centroid shifts during the macropulse (framing mode) for the long-range case and during the micropulse for the short-range case (~10-micron spatial resolution and 2-ps temporal resolution). Steering off axis before CC1, resulted in a 100-kHz bunch centroid oscillation within the macropulse that was detected by the downstream rf BPMs and the streak camera*. At 500 pC/b, 50b, and 4-mrad off-axis vertical steering into CC2, we observed an ~ 100-micron head -tail centroid shift in the streak camera image y(t) profiles which we attributed to a short-range wakefield effect. Additional results for kick-angle compensations and model results will be presented.

Authors:
 [1];  [2];  [2];  [2]
  1. Los Alamos
  2. Fermilab
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1571789
Report Number(s):
FERMILAB-POSTER-19-114-AD
oai:inspirehep.net:1761037
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 8th International Beam Instrumentation Conference, Malmo, Sweden, 09/08-09/12/2019
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Lumpkin, A. H., Thurman-Keup, R., Edstrom, D., and Ruan, J. Observations of Long-Range and Short-Range Wakefield Effects on Electron-Beam Dynamics in TESLA-type SCRF Cavities. United States: N. p., 2019. Web.
Lumpkin, A. H., Thurman-Keup, R., Edstrom, D., & Ruan, J. Observations of Long-Range and Short-Range Wakefield Effects on Electron-Beam Dynamics in TESLA-type SCRF Cavities. United States.
Lumpkin, A. H., Thurman-Keup, R., Edstrom, D., and Ruan, J. Sun . "Observations of Long-Range and Short-Range Wakefield Effects on Electron-Beam Dynamics in TESLA-type SCRF Cavities". United States. https://www.osti.gov/servlets/purl/1571789.
@article{osti_1571789,
title = {Observations of Long-Range and Short-Range Wakefield Effects on Electron-Beam Dynamics in TESLA-type SCRF Cavities},
author = {Lumpkin, A. H. and Thurman-Keup, R. and Edstrom, D. and Ruan, J.},
abstractNote = {The Fermilab Accelerator Science and Technology (FAST) facility has a unique configuration of a photocathode rf gun beam injecting two TESLA-type single cavities (CC1 and CC2) in series prior to the cryomodule. Beam propagation off axis in these cavities can result in both long-range and short-range transverse wakefields which can lead to emittance dilution within the macropulses and micropulses, respectively. Two configurations of a Hamamatsu C5680 streak camera viewing a downstream OTR screen were utilized to track centroid shifts during the macropulse (framing mode) for the long-range case and during the micropulse for the short-range case (~10-micron spatial resolution and 2-ps temporal resolution). Steering off axis before CC1, resulted in a 100-kHz bunch centroid oscillation within the macropulse that was detected by the downstream rf BPMs and the streak camera*. At 500 pC/b, 50b, and 4-mrad off-axis vertical steering into CC2, we observed an ~ 100-micron head -tail centroid shift in the streak camera image y(t) profiles which we attributed to a short-range wakefield effect. Additional results for kick-angle compensations and model results will be presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {9}
}

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: