# 17th International Conference on Ion Sources

15-20 October 2017
CERN
Europe/Zurich timezone

## Effective Transportation of Negative Hydrogen Ions in a Synthesized Hydrogen Beam

18 Oct 2017, 16:30
2h 30m
CERN

#### CERN

Centre international de Conférence Genève (CICG). http://www.cicg.ch/
Poster presentation Beam extraction, transport, and diagnostics

### Speaker

Anton Kolmogorov (Budker Institute of Nuclear Physics)

### Description

Effective transportation of negative hydrogen ions formed during charge exchange of a high-brightness proton beam with ballistic focusing in a hydrogen charge-exchange target was observed in experiment. A beam of protons with an energy of 10 keV, a current of 4.7 A, an emission current density of 470 mA/cm$^{2}$, an angular divergence of 10 mrad, and a focal length of 200 cm was formed at 1 Hz frequency in the fast atom beam source (FABS) of the polarized ion source OPPIS at BNL. The value of $\text{H}^-$ ion current passing through a 2 cm diaphragm located at a distance of 200 cm from the emitter was 75 mA.

The effective negative hydrogen ion beam transportation is explained by the focusing and confinement of negative ions in the positive plasma potential of the synthesized charge-exchanged beam of hydrogen particles. The paper presents the results of an experimental study of the parameters of a synthesized hydrogen beam in the region of the focus of a fast hydrogen atom beam. The results of numerical simulation of the effective transport of $\text{H}^-$ ions in the positive potential of the synthesized beam are given. The possibilities of applying the effective transport of a negative ion beam for injection into accelerators are discussed.

### Primary authors

Anatoli Zelenski (BNL) Anton Kolmogorov (Budker Institute of Nuclear Physics) Vladimir Davydenko (Budker Institute of Nuclear Physics)

### Co-authors

Alexander Ivanov (Budker Institute of Nuclear Physics) Dr Grigor Atoian (BNL)