Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aps..apr.h7008b&link_type=abstract
American Physical Society, APS April Meeting 2010, February 13-16, 2010, abstract #H7.008
Astronomy and Astrophysics
Astrophysics
Scientific paper
Benefits accrue when nuclear reactions relevant to astrophysical processes are studied with low-energy pulsed proton beams. Because Coulomb repulsion reduces the nuclear reaction rate, continuous backgrounds often dominate the signal of interest. Pulsing the beam can reduce these backgrounds by gating data collection electronics. Target lifetime can become short when the target current increases, so pulsing the beam to limit the average current while raising the peak pulsed current offers a way to optimize S/N. At TUNL's Laboratory for Experimental Nuclear Astrophysics, remote LabVIEW-controlled, pulsed proton-beam operation has been extended to a new ECR source by pulsing the beam extraction HV power supplies. Target proton currents > 1mA DC are available between 100 and 190 keV, and pulsed operation has been demonstrated at 15 keV. Work is underway to extend pulsed operation to energies between 100 and 190 keV and to begin initial experiments with this new capability. Latest results will be reported. )
Buckner Matthew
Carlin Bret
Cesaratto John
Clegg Thomas
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