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Title: Evaluation of Negative-Ion-Beam Driver Concepts for Heavy Ion Fusion

Abstract

We evaluate the feasibility of producing and using atomically neutral heavy ion beams produced from negative ions as drivers for an inertial confinement fusion reactor. Bromine and iodine appear to be the most attractive elements for the driver beams. Fluorine and chlorine appear to be the most appropriate feedstocks for initial tests of extractable negative ion current densities. With regards to ion sources, photodetachment neutralizers, and vacuum requirements for accelerators and beam transport, this approach appears feasible within existing technology, and the vacuum requirements are essentially identical to those for positive ion drivers except in the target chamber. The principal constraint is that this approach requires harder vacuums in the target chamber than do space-charge-neutralized positive ion drivers. With realistic (but perhaps pessimistic) estimates of the total ionization cross section, limiting the ionization of a neutral beam to less than 5% while traversing a four -meter path would require a chamber pressure of no more than 5 x 10{sup -5} torr. Alternatively, even at chamber pressures that are too high to allow propagation of atomically neutral beams, the negative ion approach may still have appeal, since it precludes the possibly serious problem of electron contamination of a positive ion beammore » during acceleration, drift compression, and focusing.« less

Authors:
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
793000
Report Number(s):
PPPL-3643
TRN: US0200878
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 14 Jan 2002
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS; ANIONS; BEAM TRANSPORT; CATIONS; CROSS SECTIONS; EVALUATION; HEAVY IONS; INERTIAL CONFINEMENT; ION SOURCES; TARGET CHAMBERS; THERMONUCLEAR REACTORS

Citation Formats

Larry R. Grisham. Evaluation of Negative-Ion-Beam Driver Concepts for Heavy Ion Fusion. United States: N. p., 2002. Web. doi:10.2172/793000.
Larry R. Grisham. Evaluation of Negative-Ion-Beam Driver Concepts for Heavy Ion Fusion. United States. doi:10.2172/793000.
Larry R. Grisham. Mon . "Evaluation of Negative-Ion-Beam Driver Concepts for Heavy Ion Fusion". United States. doi:10.2172/793000. https://www.osti.gov/servlets/purl/793000.
@article{osti_793000,
title = {Evaluation of Negative-Ion-Beam Driver Concepts for Heavy Ion Fusion},
author = {Larry R. Grisham},
abstractNote = {We evaluate the feasibility of producing and using atomically neutral heavy ion beams produced from negative ions as drivers for an inertial confinement fusion reactor. Bromine and iodine appear to be the most attractive elements for the driver beams. Fluorine and chlorine appear to be the most appropriate feedstocks for initial tests of extractable negative ion current densities. With regards to ion sources, photodetachment neutralizers, and vacuum requirements for accelerators and beam transport, this approach appears feasible within existing technology, and the vacuum requirements are essentially identical to those for positive ion drivers except in the target chamber. The principal constraint is that this approach requires harder vacuums in the target chamber than do space-charge-neutralized positive ion drivers. With realistic (but perhaps pessimistic) estimates of the total ionization cross section, limiting the ionization of a neutral beam to less than 5% while traversing a four -meter path would require a chamber pressure of no more than 5 x 10{sup -5} torr. Alternatively, even at chamber pressures that are too high to allow propagation of atomically neutral beams, the negative ion approach may still have appeal, since it precludes the possibly serious problem of electron contamination of a positive ion beam during acceleration, drift compression, and focusing.},
doi = {10.2172/793000},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 14 00:00:00 EST 2002},
month = {Mon Jan 14 00:00:00 EST 2002}
}

Technical Report:

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