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Title: Direct plasma injection scheme with beam extraction in a radio frequency quadrupole linac cavity

Abstract

Direct plasma injection scheme (DPIS) is a recently developed idea about beam injection into a radio frequency quadrupole (RFQ) linac to obtain high current pulsed heavy ion beam. Since a laser ion source is directly connected to an RFQ linac, a low energy beam transport is not needed. An ion beam is extracted at the edge of the cavity. We shifted the extraction position in the RFQ cavity to improve the beam loss problem due to beam diverging before arriving at the entrance of the RFQ electrode region. In this scheme, ion beam is extracted at the entrance of the RFQ electrode region and the extracted beam is immediately captured by a rf quadrupole electric field. A plasma electrode is inserted in the accelerator resonant cavity. It is required to avoid serious effect on the acceleration characteristics of the RFQ linac. The rf properties were measured using a network analyzer to verify the effect. The shifts of resonant frequency were negligibly small by inserting the electrode. The measurements of the electric field distribution along the beam axis in the RFQ linac showed that the plasma electrode had little effect on it. The result of beam acceleration experiment showed that themore » beam current was increased by about 20%. It was confirmed that the beam loss was reduced by this scheme.« less

Authors:
; ; ;  [1]
  1. Takasaki Advanced Radiation Research Institute, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292 (Japan)
Publication Date:
OSTI Identifier:
21123718
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 79; Journal Issue: 2; Conference: ICIS 2007: 12. international conference on ion sources, Jeju (Korea, Republic of), 26-31 Aug 2007; Other Information: DOI: 10.1063/1.2823898; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCELERATION; BEAM CURRENTS; BEAM EXTRACTION; BEAM INJECTION; BEAM TRANSPORT; ELECTRIC FIELDS; ELECTRODES; HEAVY IONS; ION BEAMS; ION SOURCES; PARTICLE BEAMS; PLASMA; PLASMA GUNS; QUADRUPOLE LINACS; QUADRUPOLES; RF SYSTEMS

Citation Formats

Kashiwagi, Hirotsugu, Okamura, Masahiro, Tamura, Jun, Takano, Junpei, Collider Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, and Accelerator division 1, Accelerator Laboratory, High Energy Accelerator Research Organization, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801. Direct plasma injection scheme with beam extraction in a radio frequency quadrupole linac cavity. United States: N. p., 2008. Web. doi:10.1063/1.2823898.
Kashiwagi, Hirotsugu, Okamura, Masahiro, Tamura, Jun, Takano, Junpei, Collider Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, & Accelerator division 1, Accelerator Laboratory, High Energy Accelerator Research Organization, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801. Direct plasma injection scheme with beam extraction in a radio frequency quadrupole linac cavity. United States. https://doi.org/10.1063/1.2823898
Kashiwagi, Hirotsugu, Okamura, Masahiro, Tamura, Jun, Takano, Junpei, Collider Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, and Accelerator division 1, Accelerator Laboratory, High Energy Accelerator Research Organization, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801. 2008. "Direct plasma injection scheme with beam extraction in a radio frequency quadrupole linac cavity". United States. https://doi.org/10.1063/1.2823898.
@article{osti_21123718,
title = {Direct plasma injection scheme with beam extraction in a radio frequency quadrupole linac cavity},
author = {Kashiwagi, Hirotsugu and Okamura, Masahiro and Tamura, Jun and Takano, Junpei and Collider Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973 and Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 and Accelerator division 1, Accelerator Laboratory, High Energy Accelerator Research Organization, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801},
abstractNote = {Direct plasma injection scheme (DPIS) is a recently developed idea about beam injection into a radio frequency quadrupole (RFQ) linac to obtain high current pulsed heavy ion beam. Since a laser ion source is directly connected to an RFQ linac, a low energy beam transport is not needed. An ion beam is extracted at the edge of the cavity. We shifted the extraction position in the RFQ cavity to improve the beam loss problem due to beam diverging before arriving at the entrance of the RFQ electrode region. In this scheme, ion beam is extracted at the entrance of the RFQ electrode region and the extracted beam is immediately captured by a rf quadrupole electric field. A plasma electrode is inserted in the accelerator resonant cavity. It is required to avoid serious effect on the acceleration characteristics of the RFQ linac. The rf properties were measured using a network analyzer to verify the effect. The shifts of resonant frequency were negligibly small by inserting the electrode. The measurements of the electric field distribution along the beam axis in the RFQ linac showed that the plasma electrode had little effect on it. The result of beam acceleration experiment showed that the beam current was increased by about 20%. It was confirmed that the beam loss was reduced by this scheme.},
doi = {10.1063/1.2823898},
url = {https://www.osti.gov/biblio/21123718}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 2,
volume = 79,
place = {United States},
year = {Fri Feb 15 00:00:00 EST 2008},
month = {Fri Feb 15 00:00:00 EST 2008}
}