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Title: Wakefields of a Beam near a Single Plate in a Flat Dechirper

Abstract

At linac-based, X-ray free electron lasers (FELs), there is interest in streaking the beam by inducing the transverse wakes in a flat dechirper, by passing the beam near to one of its two jaws. For LCLS-II - as has already been done for LCLS-I - this way of using the dechirper will e.g. facilitate two-color and fresh slice schemes of running the FEL. With the beam a distance from the near wall of say b ~ 0.25 mm and from the far wall by ≳ 5 mm, the second wall will no longer affect the results. The physics will be quite different from the two plate case: with two plates the impedance has a resonance spike whose frequency depends on the plate separation 2a; in the single plate case this parameter no longer exists. Formulas for the longitudinal, dipole, and quadrupole wakes for a beam off-axis between two dechirper plates, valid for the range of bunch lengths of interest in an X-ray FEL, are given in reference 3. By taking the proper limit, we can obtain the corresponding wakes for a beam close to one dechirper plate and far from the other. This is the task we perform in thismore » note.« less

Authors:
 [1];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1340168
Report Number(s):
SLAC-PUB-16881
arXiv:1611.09460; TRN: US1701496
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; X RADIATION; PLATES; BEAM DYNAMICS; FREE ELECTRON LASERS; WALLS; LINEAR ACCELERATORS; DIPOLES; DISTANCE; ELECTRIC IMPEDANCE; BEAM FOCUSING MAGNETS; ELECTROMAGNETIC FIELDS; ACCPHY

Citation Formats

Bane, Karl, and Stupakov, Gennady. Wakefields of a Beam near a Single Plate in a Flat Dechirper. United States: N. p., 2016. Web. doi:10.2172/1340168.
Bane, Karl, & Stupakov, Gennady. Wakefields of a Beam near a Single Plate in a Flat Dechirper. United States. https://doi.org/10.2172/1340168
Bane, Karl, and Stupakov, Gennady. 2016. "Wakefields of a Beam near a Single Plate in a Flat Dechirper". United States. https://doi.org/10.2172/1340168. https://www.osti.gov/servlets/purl/1340168.
@article{osti_1340168,
title = {Wakefields of a Beam near a Single Plate in a Flat Dechirper},
author = {Bane, Karl and Stupakov, Gennady},
abstractNote = {At linac-based, X-ray free electron lasers (FELs), there is interest in streaking the beam by inducing the transverse wakes in a flat dechirper, by passing the beam near to one of its two jaws. For LCLS-II - as has already been done for LCLS-I - this way of using the dechirper will e.g. facilitate two-color and fresh slice schemes of running the FEL. With the beam a distance from the near wall of say b ~ 0.25 mm and from the far wall by ≳ 5 mm, the second wall will no longer affect the results. The physics will be quite different from the two plate case: with two plates the impedance has a resonance spike whose frequency depends on the plate separation 2a; in the single plate case this parameter no longer exists. Formulas for the longitudinal, dipole, and quadrupole wakes for a beam off-axis between two dechirper plates, valid for the range of bunch lengths of interest in an X-ray FEL, are given in reference 3. By taking the proper limit, we can obtain the corresponding wakes for a beam close to one dechirper plate and far from the other. This is the task we perform in this note.},
doi = {10.2172/1340168},
url = {https://www.osti.gov/biblio/1340168}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {11}
}