Method and apparatus for recirculation with control of synchrotron radiation
Abstract
A method for controlling beam quality degradation from ISR and CSR and stabilizing the microbunching instability (.mu.BI) in a high brightness electron beam. The method includes providing a super-periodic second order achromat line with each super period being individually linearly achromatic and isochronous, setting individual superperiod tunes to rational fractions of an integer (such as 4.sup.th or 6.sup.th integers), setting individual bend angles to be as small as practical to reduce driving terms due to dispersion and dispersive angle, and setting bend radii as large enough to suppress ISR but not negatively affect the radial dependence of CSR. The method includes setting the structure of the individual superperiods to minimize bend plane beam envelope values in the dipoles to reduce betatron response to a CSR event at a dispersed location, increasing beam angular divergence, and creating dispersion nodes in the dipoles to similarly reduce response to CSR events, and limit R.sub.56 modulation in order to mitigate .mu.BI.
- Inventors:
- Issue Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1279738
- Patent Number(s):
- 9408290
- Application Number:
- 14/526,597
- Assignee:
- JEFFERSON SCIENCE ASSOCIATES, LLC (Newport News, VA)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05H - PLASMA TECHNIQUE
- DOE Contract Number:
- AC05-06OR23177
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2014 Oct 29
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; 42 ENGINEERING
Citation Formats
Douglas, David R., and Tennant, Christopher. Method and apparatus for recirculation with control of synchrotron radiation. United States: N. p., 2016.
Web.
Douglas, David R., & Tennant, Christopher. Method and apparatus for recirculation with control of synchrotron radiation. United States.
Douglas, David R., and Tennant, Christopher. Tue .
"Method and apparatus for recirculation with control of synchrotron radiation". United States. https://www.osti.gov/servlets/purl/1279738.
@article{osti_1279738,
title = {Method and apparatus for recirculation with control of synchrotron radiation},
author = {Douglas, David R. and Tennant, Christopher},
abstractNote = {A method for controlling beam quality degradation from ISR and CSR and stabilizing the microbunching instability (.mu.BI) in a high brightness electron beam. The method includes providing a super-periodic second order achromat line with each super period being individually linearly achromatic and isochronous, setting individual superperiod tunes to rational fractions of an integer (such as 4.sup.th or 6.sup.th integers), setting individual bend angles to be as small as practical to reduce driving terms due to dispersion and dispersive angle, and setting bend radii as large enough to suppress ISR but not negatively affect the radial dependence of CSR. The method includes setting the structure of the individual superperiods to minimize bend plane beam envelope values in the dipoles to reduce betatron response to a CSR event at a dispersed location, increasing beam angular divergence, and creating dispersion nodes in the dipoles to similarly reduce response to CSR events, and limit R.sub.56 modulation in order to mitigate .mu.BI.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {8}
}
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