Hole Geometry Optimization of the Extraction Electrode in a Duopigatron Ion Source

Autor:	Shigeru Tanaka, Hirofumi Shirakata, Shinzaburo Matsuda, Yoshihiro Ohara
Rok vydání:	1978
Předmět:	Beam diameter Physics and Astronomy (miscellaneous) Ion beam business.industry Chemistry General Engineering General Physics and Astronomy Ion gun Optics Ion beam deposition Physics::Accelerator Physics M squared Laser beam quality Atomic physics business Beam divergence Perveance
Zdroj:	Japanese Journal of Applied Physics. 17:423-428
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.17.423
Popis:	The optimum shape of the extraction aperture in the positive electrode is investigated experimentally by using a duopigatron ion source with single hole extraction electrodes. We find that a slightly chamfered aperture gives the best beam divergence without decreasing the optimum perveance. This result is applied to the ion sources of the JFT-2 neutral beam injector and the injection power to the torus can be improved appreciably. The computational result about the optimum emitting surface by the ion beam simulation code indicates that a slight chamfering is preferable for beam optics.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2f86cba7bd09a03340bf62d249a3c3d7 https://doi.org/10.1143/jjap.17.423 Zobrazit plný text záznamu