# Beam analysis tomography

## Abstract

Projections of charged particle beam current density have been used for many years as a measure of beam position and size. The conventional practice of obtaining only two projections, usually in the horizontal and vertical planes, puts a severe limit on the detail that can be recovered from the projections. A third projection provides sufficient improvement to justify the addition of a wire to the conventional wire scanner in certain cases. A group of programs using algebraic reconstruction techniques was written to reconstruct beam current density from beam projections obtained at 3 or more specific or arbitrary angles around the beam. A generalized program, which makes use of arbitrary 2 x 2 transfer matrices between projections, can be used to reconstruct transverse or longitudinal emittance from appropriate projections. Reconstruction examples of beam current density and transverse and longitudinal emittance using experimental data from the LAMPF accelerator beam are given. The method may be applied to extract emittance and beam current density information using non-intercepting profile measuring devices in high-current accelerators.

- Authors:

- Publication Date:

- Research Org.:
- Chalk River Nuclear Labs., Ontario

- OSTI Identifier:
- 5468897

- Resource Type:
- Journal Article

- Journal Name:
- IEEE Trans. Nucl. Sci.; (United States)

- Additional Journal Information:
- Journal Volume: NS-26:1

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 43 PARTICLE ACCELERATORS; BEAM PROFILES; BEAM MONITORS; COMPUTER CALCULATIONS; CURRENT DENSITY; EXPERIMENTAL DATA; GRAPHS; IMAGES; THREE-DIMENSIONAL CALCULATIONS; DATA; DATA FORMS; INFORMATION; MEASURING INSTRUMENTS; NUMERICAL DATA; 430303* - Particle Accelerators- Experimental Facilities & Equipment

### Citation Formats

```
Fraser, J.S.
```*Beam analysis tomography*. United States: N. p., 1979.
Web. doi:10.1109/TNS.1979.4330456.

```
Fraser, J.S.
```*Beam analysis tomography*. United States. doi:10.1109/TNS.1979.4330456.

```
Fraser, J.S. Thu .
"Beam analysis tomography". United States. doi:10.1109/TNS.1979.4330456.
```

```
@article{osti_5468897,
```

title = {Beam analysis tomography},

author = {Fraser, J.S.},

abstractNote = {Projections of charged particle beam current density have been used for many years as a measure of beam position and size. The conventional practice of obtaining only two projections, usually in the horizontal and vertical planes, puts a severe limit on the detail that can be recovered from the projections. A third projection provides sufficient improvement to justify the addition of a wire to the conventional wire scanner in certain cases. A group of programs using algebraic reconstruction techniques was written to reconstruct beam current density from beam projections obtained at 3 or more specific or arbitrary angles around the beam. A generalized program, which makes use of arbitrary 2 x 2 transfer matrices between projections, can be used to reconstruct transverse or longitudinal emittance from appropriate projections. Reconstruction examples of beam current density and transverse and longitudinal emittance using experimental data from the LAMPF accelerator beam are given. The method may be applied to extract emittance and beam current density information using non-intercepting profile measuring devices in high-current accelerators.},

doi = {10.1109/TNS.1979.4330456},

journal = {IEEE Trans. Nucl. Sci.; (United States)},

number = ,

volume = NS-26:1,

place = {United States},

year = {1979},

month = {2}

}