title: Studies of extraction and transport system for highly charged ion beam of 18 GHz superconducting electron cyclotron resonance ion source at Research Center for Nuclear Physics.
abstract: An 18 GHz superconducting electron cyclotron resonance ion source is installed to increase beam currents and to extend the variety of ions especially for highly charged heavy ions which can be accelerated by cyclotrons of Research Center for Nuclear Physics (RCNP), Osaka University. The beam production developments of several ions from B to Xe have been already done [T. Yorita, K. Hatanaka, M. Fukuda, M. Kibayashi, S. Morinobu, H.Okamura, and A. Tamii, Rev. Sci. Instrum. 79, 02A311 (2008) and T. Yorita, K. Hatanaka, M. Fukuda, M. Kibayashi, S. Morinobu, H.Okamura, and A. Tamii, Rev. Sci. Instrum. 81, 02A332 (2010)] and the further studies for those beam extraction and its transport have been done in order to increase the beam current more. The plasma electrode, extraction electrode, and einzel lens are modified. Especially extraction electrode can be applied minus voltage for the beam extraction and it works well to improve the extracted beam current. The extraction voltage dependences of transmission and emittance also have been studied for beam current improvement which is injected into azimuthally varying field cyclotron at RCNP.
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yorita
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hatanaka
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Fukuda
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Ueda
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yasuda
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Morinobu
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Tamii
authors.affiliation: Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kamakura