# Method and apparatus for control of coherent synchrotron radiation effects during recirculation with bunch compression

## Abstract

A modulated-bending recirculating system that avoids CSR-driven breakdown in emittance compensation by redistributing the bending along the beamline. The modulated-bending recirculating system includes a) larger angles of bending in initial FODO cells, thereby enhancing the impact of CSR early on in the beam line while the bunch is long, and 2) a decreased bending angle in the final FODO cells, reducing the effect of CSR while the bunch is short. The invention describes a method for controlling the effects of CSR during recirculation and bunch compression including a) correcting chromatic aberrations, b) correcting lattice and CSR-induced curvature in the longitudinal phase space by compensating T.sub.566, and c) using lattice perturbations to compensate obvious linear correlations x-dp/p and x'-dp/p.

- Inventors:

- Publication Date:

- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

- Sponsoring Org.:
- USDOE

- OSTI Identifier:
- 1225706

- Patent Number(s):
- 9,184,022

- Application Number:
- 14/526,616

- Assignee:
- JEFFERSON SCIENCE ASSOCIATES, LLC

- DOE Contract Number:
- AC05-06OR23177

- Resource Type:
- Patent

- Resource Relation:
- Patent File Date: 2014 Oct 29

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

### Citation Formats

```
Douglas, David R, and Tennant, Christopher.
```*Method and apparatus for control of coherent synchrotron radiation effects during recirculation with bunch compression*. United States: N. p., 2015.
Web.

```
Douglas, David R, & Tennant, Christopher.
```*Method and apparatus for control of coherent synchrotron radiation effects during recirculation with bunch compression*. United States.

```
Douglas, David R, and Tennant, Christopher. Tue .
"Method and apparatus for control of coherent synchrotron radiation effects during recirculation with bunch compression". United States. https://www.osti.gov/servlets/purl/1225706.
```

```
@article{osti_1225706,
```

title = {Method and apparatus for control of coherent synchrotron radiation effects during recirculation with bunch compression},

author = {Douglas, David R and Tennant, Christopher},

abstractNote = {A modulated-bending recirculating system that avoids CSR-driven breakdown in emittance compensation by redistributing the bending along the beamline. The modulated-bending recirculating system includes a) larger angles of bending in initial FODO cells, thereby enhancing the impact of CSR early on in the beam line while the bunch is long, and 2) a decreased bending angle in the final FODO cells, reducing the effect of CSR while the bunch is short. The invention describes a method for controlling the effects of CSR during recirculation and bunch compression including a) correcting chromatic aberrations, b) correcting lattice and CSR-induced curvature in the longitudinal phase space by compensating T.sub.566, and c) using lattice perturbations to compensate obvious linear correlations x-dp/p and x'-dp/p.},

doi = {},

journal = {},

number = ,

volume = ,

place = {United States},

year = {2015},

month = {11}

}

Works referenced in this record:

##
Cancellation of Coherent Synchrotron Radiation Kicks with Optics Balance

journal, January 2013

- Di Mitri, S.; Cornacchia, M.; Spampinati, S.
- Physical Review Letters, Vol. 110, Issue 1