Abstract
The Spallation Neutron Source H- source on the ion source test stand is being used to study the emittance of the H- -ion beam injected into the SNS radiofrequency quadrupole (RFQ). The emittance measurements are performed with a LBNL Allison scanner that underwent several modifications. The slit width was optimized to improve the signal-to-noise ratio. In addition, the electric deflector plates were replaced with plates featuring a staircased surface. This modification is shown to suppress over 99% of ghost signals generated by the beam hitting the deflector plates. Both modifications, combined with noise suppression measures and a self-consistent analysis, yield highly accurate results. Measured emittances are presented as a function of the ion-beam current.
| Original language | English |
|---|---|
| Article number | 03B706 |
| Journal | Review of Scientific Instruments |
| Volume | 77 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 2006 |
| Externally published | Yes |
Funding
This work was supported by the U.S. Department of Energy. SNS is managed by UT-Battelle, LLC, under Contract No. DF-ACO5-00OR22725 for the U.S. Department of Energy. The authors would like to thank S. N. Murray, Jr. for collecting some of the presented data. In addition, the authors acknowledge invaluable discussions with many colleagues, especially P. Schmor.