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Title: Development of long-lived thick carbon stripper foils for high energy heavy ion accelerators by a heavy ion beam sputtering method

Abstract

In the past decade, we have developed extremely long-lived carbon stripper foils of 1-50 {mu}g/cm{sup 2} thickness prepared by a heavy ion beam sputtering method. These foils were mainly used for low energy heavy ion beams. Recently, high energy negative Hydrogen and heavy ion accelerators have started to use carbon stripper foils of over 100 {mu}g/cm{sup 2} in thickness. However, the heavy ion beam sputtering method was unsuccessful in production of foils thicker than about 50 {mu}g/cm{sup 2} because of the collapse of carbon particle build-up from substrates during the sputtering process. The reproduction probability of the foils was less than 25%, and most of them had surface defects. However, these defects were successfully eliminated by introducing higher beam energies of sputtering ions and a substrate heater during the sputtering process. In this report we describe a highly reproducible method for making thick carbon stripper foils by a heavy ion beam sputtering with a Krypton ion beam.

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Center of General Education, Tokyo University of Science, Suwa, 5000-1 Toyohira, Chino Nagano 391-0292 (Japan)
  2. Center for Nuclear Study, School of Science, University of Tokyo, 2-1 Hirosawa, Riken Campus, Wako Saitama 351-0198 (Japan)
  3. Van de Graaff Laboratory, Department of Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro Tokyo 152-8551 (Japan)
  4. Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba Ibaraki 305-0801 (Japan)
  5. Heavy Ion Cancer Therapy Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage Chiba 263-855 (Japan)
Publication Date:
OSTI Identifier:
22116949
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1525; Journal Issue: 1; Conference: 22. international conference on application of accelerators in research and industry, Ft. Worth, TX (United States), 5-10 Aug 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; CARBON; FOILS; HEAVY ION ACCELERATORS; HEAVY IONS; HYDROGEN 1 MINUS BEAMS; KRYPTON IONS; SPUTTERING; SUBSTRATES; THICKNESS

Citation Formats

Muto, Hideshi, Ohshiro, Yukimitsu, Kawasaki, Katsunori, Oyaizu, Michihiro, and Hattori, Toshiyuki. Development of long-lived thick carbon stripper foils for high energy heavy ion accelerators by a heavy ion beam sputtering method. United States: N. p., 2013. Web. doi:10.1063/1.4802309.
Muto, Hideshi, Ohshiro, Yukimitsu, Kawasaki, Katsunori, Oyaizu, Michihiro, & Hattori, Toshiyuki. Development of long-lived thick carbon stripper foils for high energy heavy ion accelerators by a heavy ion beam sputtering method. United States. https://doi.org/10.1063/1.4802309
Muto, Hideshi, Ohshiro, Yukimitsu, Kawasaki, Katsunori, Oyaizu, Michihiro, and Hattori, Toshiyuki. 2013. "Development of long-lived thick carbon stripper foils for high energy heavy ion accelerators by a heavy ion beam sputtering method". United States. https://doi.org/10.1063/1.4802309.
@article{osti_22116949,
title = {Development of long-lived thick carbon stripper foils for high energy heavy ion accelerators by a heavy ion beam sputtering method},
author = {Muto, Hideshi and Ohshiro, Yukimitsu and Kawasaki, Katsunori and Oyaizu, Michihiro and Hattori, Toshiyuki},
abstractNote = {In the past decade, we have developed extremely long-lived carbon stripper foils of 1-50 {mu}g/cm{sup 2} thickness prepared by a heavy ion beam sputtering method. These foils were mainly used for low energy heavy ion beams. Recently, high energy negative Hydrogen and heavy ion accelerators have started to use carbon stripper foils of over 100 {mu}g/cm{sup 2} in thickness. However, the heavy ion beam sputtering method was unsuccessful in production of foils thicker than about 50 {mu}g/cm{sup 2} because of the collapse of carbon particle build-up from substrates during the sputtering process. The reproduction probability of the foils was less than 25%, and most of them had surface defects. However, these defects were successfully eliminated by introducing higher beam energies of sputtering ions and a substrate heater during the sputtering process. In this report we describe a highly reproducible method for making thick carbon stripper foils by a heavy ion beam sputtering with a Krypton ion beam.},
doi = {10.1063/1.4802309},
url = {https://www.osti.gov/biblio/22116949}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1525,
place = {United States},
year = {Fri Apr 19 00:00:00 EDT 2013},
month = {Fri Apr 19 00:00:00 EDT 2013}
}