Fast slit-beam extraction and chopping for neutron generator
Abstract
High-intensity fast white neutron pulses are needed for pulsed fast neutron transmission spectroscopy (PFNTS). A compact tritium-tritium fusion reaction neutron generator with an integrated ion beam chopping system has been designed, simulated, and tested for PFNTS. The design consists of a toroidal plasma chamber with 20 extraction slits, concentric cylindrical electrodes, chopper plates, and a central titanium-coated beam target. The total ion beam current is 1 A. The beam chopping is done at 30 keV energy with a parallel-plate deflector integrated with an Einzel lens. Beam pulses with 5 ns width can be achieved with a 15 ns rise/fall time {+-}1500 V sweep on the chopper plates. The neutrons are produced at 120 keV energy. A three-dimensional simulation code based on Vlasov iteration was developed for simulating the ion optics of this system. The results with this code were found to be consistent with other simulation codes. So far we have measured 50 ns ion beam pulses from the system.
- Authors:
-
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States)
- (United States)
- Publication Date:
- OSTI Identifier:
- 20779086
- Resource Type:
- Journal Article
- Resource Relation:
- Journal Name: Review of Scientific Instruments; Journal Volume: 77; Journal Issue: 3; Conference: 11. international conference on ion sources, Caen (France), 12-16 Sep 2005; Other Information: DOI: 10.1063/1.2163271; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; BEAM EXTRACTION; COMPUTERIZED SIMULATION; CYLINDRICAL CONFIGURATION; DESIGN; FAST NEUTRONS; ION BEAMS; KEV RANGE; NEUTRON BEAMS; NEUTRON DETECTION; NEUTRON GENERATORS; NEUTRON SPECTROSCOPY; PLATES; PULSES; THREE-DIMENSIONAL CALCULATIONS; TITANIUM; TRITIUM
Citation Formats
Kalvas, T., Hahto, S.K., Gicquel, F., King, M., Vainionpaeae, J.H., Reijonen, J., Leung, K.N., Miller, T.G., and Tensor Technology Inc., 254 Brentwood Lane, Madison, Alabama 35758. Fast slit-beam extraction and chopping for neutron generator. United States: N. p., 2006.
Web. doi:10.1063/1.2163271.
Kalvas, T., Hahto, S.K., Gicquel, F., King, M., Vainionpaeae, J.H., Reijonen, J., Leung, K.N., Miller, T.G., & Tensor Technology Inc., 254 Brentwood Lane, Madison, Alabama 35758. Fast slit-beam extraction and chopping for neutron generator. United States. doi:10.1063/1.2163271.
Kalvas, T., Hahto, S.K., Gicquel, F., King, M., Vainionpaeae, J.H., Reijonen, J., Leung, K.N., Miller, T.G., and Tensor Technology Inc., 254 Brentwood Lane, Madison, Alabama 35758. Wed .
"Fast slit-beam extraction and chopping for neutron generator". United States.
doi:10.1063/1.2163271.
@article{osti_20779086,
title = {Fast slit-beam extraction and chopping for neutron generator},
author = {Kalvas, T. and Hahto, S.K. and Gicquel, F. and King, M. and Vainionpaeae, J.H. and Reijonen, J. and Leung, K.N. and Miller, T.G. and Tensor Technology Inc., 254 Brentwood Lane, Madison, Alabama 35758},
abstractNote = {High-intensity fast white neutron pulses are needed for pulsed fast neutron transmission spectroscopy (PFNTS). A compact tritium-tritium fusion reaction neutron generator with an integrated ion beam chopping system has been designed, simulated, and tested for PFNTS. The design consists of a toroidal plasma chamber with 20 extraction slits, concentric cylindrical electrodes, chopper plates, and a central titanium-coated beam target. The total ion beam current is 1 A. The beam chopping is done at 30 keV energy with a parallel-plate deflector integrated with an Einzel lens. Beam pulses with 5 ns width can be achieved with a 15 ns rise/fall time {+-}1500 V sweep on the chopper plates. The neutrons are produced at 120 keV energy. A three-dimensional simulation code based on Vlasov iteration was developed for simulating the ion optics of this system. The results with this code were found to be consistent with other simulation codes. So far we have measured 50 ns ion beam pulses from the system.},
doi = {10.1063/1.2163271},
journal = {Review of Scientific Instruments},
number = 3,
volume = 77,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}
DOI: 10.1063/1.2163271
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Fast ion beam chopping system for neutron generators
Fast deuterium (D{sup +}) and tritium (T{sup +}) ion beam pulses are needed in some neutron-based imaging systems. A compact, integrated fast ion beam extraction and chopping system has been developed and tested at the Lawrence Berkeley National Laboratory for these applications, and beam pulses with 15 ns full width at half maximum have been achieved. Computer simulations together with experimental tests indicate that even faster pulses are achievable by shortening the chopper voltage rise time. This chopper arrangement will be implemented in a coaxial neutron generator, in which a small point-like neutron source is created by multiple 120 keVmore »