High current DC negative ion source for cyclotron.
Rev Sci Instrum
; 87(2): 02B135, 2016 Feb.
Article
in En
| MEDLINE
| ID: mdl-26932017
ABSTRACT
A filament driven multi-cusp negative ion source has been developed for proton cyclotrons in medical applications. In Cs-free operation, continuous H(-) beam of 10 mA and D(-) beam of 3.3 mA were obtained stably at an arc-discharge power of 3 kW and 2.4 kW, respectively. In Cs-seeded operation, H(-) beam current reached 22 mA at a lower arc power of 2.6 kW with less co-extracted electron current. The optimum gas flow rate, which gives the highest H(-) current, was 15 sccm in the Cs-free operation, while it decreased to 4 sccm in the Cs-seeded operation. The relationship between H(-) production and the design/operating parameters has been also investigated by a numerical study with KEIO-MARC code, which gives a reasonable explanation to the experimental results of the H(-) current dependence on the arc power.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Cesium
/
Cyclotrons
/
Deuterium
/
Anions
Language:
En
Journal:
Rev Sci Instrum
Year:
2016
Document type:
Article
Affiliation country:
Japan