Progress in the high current experiment (HCX) February-July 2002 Page: 1 of 7
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LBNL-51476
PROGRESS IN THE HIGH CURRENT EXPERIMENT (HCX)
FEBRUARY-JULY 20021
P.A. Seidla, D. Bacaa, F.M. Bienloseka, B. Bukha'b, C.M. Celataa, A. Cooreya', C. Dugan ad, A.
Faltensa, A. Friedman*, D.P. Grote*, I. Haber', K. Jordan', J.W. Kwana, S.M. Lunde, E.P. Leea, B.G.
Logana, A.W. Molvik*, L. Prost', G. Sabbia, W.W. Waldrona
(a) Lawrence Berkeley National Laboratory, Berkeley, CA 94720 & The Heavy Ion Fusion
Virtual National Laboratory (HIF-VNL)
(b) City College of San Francisco, San Francisco, CA 94112
(c) Univ. of California Los Angeles, Los Angeles, CA 90095
(d) Rensselaer Polytechnic Institute, Troy, NY 12180
(e) Lawrence Livermore National Laboratory, Livermore, CA 94550 & HIF-VNL
(f) Univ. of Maryland, College Park, MD 20742
(g) Univ. of California Berkeley, Berkeley, CA 94720Abstract
This paper reports progress in the HCX experimental
program since the last HIF-VNL Program Advisory
Committee Review (February 14-15 2002). On July 25
2002 the experiment was shut down for about four weeks
to move the control room.
A principal area of effort has been to obtain and
evaluate the first experimental results carried out with a
matched and well-aligned K' ion beam transported
through 10 electrostatic transport quadrupoles. These are
the main results and highlights to date:
Al. There is no emittance growth within the sensitivity
of the diagnostics, and little beam loss. The beam
centroid is aligned to within 0.5 mm and 2 mrad of
the central axis of the channel, and the envelope
mismatch amplitude is <2 mm.
A2. A long-life, alumino-silicate source has replaced a
contact-ionization source, eliminating depletion-
induced experimental uncertainties.
A3. Significant differences between the experimental
data and early theoretical calculations of the beam
envelope propagating through the electrostatic
quadrupoles were encountered. More detailed
envelope models and simulations were developed
and experimental parameter sensitivities were
analyzed. This work has resolved most of the
discrepancy and achievable limits on envelope
predictability and control are being probed.
A4. The experimental current density distribution,
J(x,y), and phase-space data are being used to
initialize high-resolution simulations to enable
Supported by the Office of Energy Research, US DOE, at LBNL and
LLNL under contract numbers DE-AC03-76SF00098, W-7405-Eng-48.realistic modeling and detailed comparisons to
experiment.
In other areas of HCX R&D:
B1. We have made progress in the development of
new time-resolved phase-space diagnostics that
will speed up data acquisition in this and other
upcoming beam experiments in the HIF-VNL.
B2. Preliminary results from a Gas, Electron Source
Diagnostic (GESD) are presented, which
measures gas desorption and secondary
electrons. The secondary emission yield varies
as cos'(0), as predicted theoretically. Data from
the GESD will be relevant to upcoming
experiments on particle loss and electron effects
in a magnetic quadrupole lattice.
B3. The design of the superconducting quadrupole
cryostat needed for a future phase of HCX
experimentation has been refined and a vendor
has been selected from a group of five that
submitted bids. Construction of an optimized
prototype quadrupole began this summer.
B4. The design of a longitudinal bunch control
induction module is near a final design review
(DOE SBIR Phase II). The module will apply
agile control of the acceleration waveforms to
correct for space charge field effects on the
head/tail of the beam.
1. INTRODUCTION
The High Current Experiment (HCX) located at
Lawrence Berkeley National Lab and carried out by the
HIF-VNL is designed to explore the physics of intense9/12/02
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Seidl, P. A.; Baca, D.; Bieniosek, F. M.; Bukh, B.; Celata, C. M.; Coorey, A. et al. Progress in the high current experiment (HCX) February-July 2002, report, September 9, 2002; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc741220/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.