# Intra-Beam and Touschek Scattering Computations for Beam with Non-Gaussian Longitudinal Distributions

## Abstract

Both intra-beamscattering (IBS) and the Touschek effect become prominent formulti-bend-achromat- (MBA-) based ultra-low-emittance storage rings. To mitigate the transverse emittance degradation and obtain a reasonably long beam lifetime, a higher harmonic rf cavity (HHC) is often proposed to lengthen the bunch. The use of such a cavity results in a non-gaussian longitudinal distribution. However, common methods for computing IBS and Touschek scattering assume Gaussian distributions. Modifications have been made to several simulation codes that are part of the elegant [1] toolkit to allow these computations for arbitrary longitudinal distributions. After describing thesemodifications, we review the results of detailed simulations for the proposed hybrid seven-bend-achromat (H7BA) upgrade lattice [2] for the Advanced Photon Source.

- Authors:

- Publication Date:

- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

- OSTI Identifier:
- 1335911

- DOE Contract Number:
- AC02-06CH11357

- Resource Type:
- Conference

- Resource Relation:
- Conference: 6th International Particle Accelerator Conference (IPAC 2015), 05/03/15 - 05/08/15, Richmond, VA

- Country of Publication:
- United States

- Language:
- English

### Citation Formats

```
Xiao, A., and Borland, M.
```*Intra-Beam and Touschek Scattering Computations for Beam with Non-Gaussian Longitudinal Distributions*. United States: N. p., 2015.
Web.

```
Xiao, A., & Borland, M.
```*Intra-Beam and Touschek Scattering Computations for Beam with Non-Gaussian Longitudinal Distributions*. United States.

```
Xiao, A., and Borland, M. Thu .
"Intra-Beam and Touschek Scattering Computations for Beam with Non-Gaussian Longitudinal Distributions". United States.
```

```
@article{osti_1335911,
```

title = {Intra-Beam and Touschek Scattering Computations for Beam with Non-Gaussian Longitudinal Distributions},

author = {Xiao, A. and Borland, M.},

abstractNote = {Both intra-beamscattering (IBS) and the Touschek effect become prominent formulti-bend-achromat- (MBA-) based ultra-low-emittance storage rings. To mitigate the transverse emittance degradation and obtain a reasonably long beam lifetime, a higher harmonic rf cavity (HHC) is often proposed to lengthen the bunch. The use of such a cavity results in a non-gaussian longitudinal distribution. However, common methods for computing IBS and Touschek scattering assume Gaussian distributions. Modifications have been made to several simulation codes that are part of the elegant [1] toolkit to allow these computations for arbitrary longitudinal distributions. After describing thesemodifications, we review the results of detailed simulations for the proposed hybrid seven-bend-achromat (H7BA) upgrade lattice [2] for the Advanced Photon Source.},

doi = {},

url = {https://www.osti.gov/biblio/1335911},
journal = {},

number = ,

volume = ,

place = {United States},

year = {2015},

month = {1}

}