Charge fractions and energy width of heavy ion beam probe for large helical device

A heavy ion beam probe (HIBP) has been used as a reliable method to measure the plasma potential and its fluctuation in a magnetically confined fusion plasma. On the large helical device (LHD) an Au + beam produced by a 3 MV tandem acceleration system will be used. It is necessary to optimize the ch...

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Published inFusion engineering and design Vol. 34; pp. 675 - 678
Main Authors Taniike, Akira, Sasao, Mamiko, Fujita, Junji, Hamada, Yasuji, Wada, Motoi
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.1997
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Abstract A heavy ion beam probe (HIBP) has been used as a reliable method to measure the plasma potential and its fluctuation in a magnetically confined fusion plasma. On the large helical device (LHD) an Au + beam produced by a 3 MV tandem acceleration system will be used. It is necessary to optimize the charge fractions and minimize the energy broadening of the Au + beam. Charge fractions can be calculated from electron loss and electron capture cross-sections. It is predicted that the optimum gas thickness for Au + beam production is about 4 × 10 14 cm −2. The broadening due to electron stripping is calculated to be several electronvolts and does not depend on the target mass. The energy straggling due to multiple collisions at the optimum target thickness can be calculated theoretically taking the lower limit of the impact parameter into account. Consequently, the total energy width of the Au + produced by a tandem system might be about 100 eV.
AbstractList A heavy ion beam probe (HIBP) has been used as a reliable method to measure the plasma potential and its fluctuation in a magnetically confined fusion plasma. On the large helical device (LHD) an Au + beam produced by a 3 MV tandem acceleration system will be used. It is necessary to optimize the charge fractions and minimize the energy broadening of the Au + beam. Charge fractions can be calculated from electron loss and electron capture cross-sections. It is predicted that the optimum gas thickness for Au + beam production is about 4 × 10 14 cm −2. The broadening due to electron stripping is calculated to be several electronvolts and does not depend on the target mass. The energy straggling due to multiple collisions at the optimum target thickness can be calculated theoretically taking the lower limit of the impact parameter into account. Consequently, the total energy width of the Au + produced by a tandem system might be about 100 eV.
Author Hamada, Yasuji
Wada, Motoi
Sasao, Mamiko
Fujita, Junji
Taniike, Akira
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CitedBy_id crossref_primary_10_1016_j_physleta_2015_09_031
crossref_primary_10_1585_pfr_2_S1100
crossref_primary_10_1585_pfr_3_031
crossref_primary_10_1063_1_1538507
Cites_doi 10.1063/1.1142928
10.1016/0168-9002(88)90790-5
10.1016/0029-554X(82)90496-7
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