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Optimizing beam transport in rapidly compressing beams on the neutralized drift compression experiment-II

Journal Article · · Matter and Radiation at Extremes
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The Neutralized Drift Compression Experiment-II (NDCX-II) is an induction linac that generates intense pulses of 1.2 MeV helium ions for heating matter to extreme conditions. Here, we present recent results on optimizing beam transport. The NDCX-II beamline includes a 1-m-long drift section downstream of the last transport solenoid, which is filled with charge-neutralizing plasma that enables rapid longitudinal compression of an intense ion beam against space-charge forces. The transport section on NDCX-II consists of 28 solenoids. Finding optimal field settings for a group of solenoids requires knowledge of the envelope parameters of the beam. Imaging the beam on the scintillator gives the radius of the beam, but the envelope angle is not measured directly. We demonstrate how the parameters of the beam envelope (radius, envelop angle, and emittance) can be reconstructed from a series of images taken by varying the B-field strengths of a solenoid upstream of the scintillator. We use this technique to evaluate emittance at several points in the NDCX-II beamline and for optimizing the trajectory of the beam at the entry of the plasma-filled drift section.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Grant/Contract Number:
AC02-05CH11231; AC02-09CH11466; AC52-07NA27344
OSTI ID:
1437822
Alternate ID(s):
OSTI ID: 1544508
OSTI ID: 1458509
Report Number(s):
LLNL-JRNL--774149
Journal Information:
Matter and Radiation at Extremes, Journal Name: Matter and Radiation at Extremes Journal Issue: 2 Vol. 3; ISSN 2468-2047
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
China
Language:
English

References (7)

Ferroelectric plasma sources for NDCX-II and heavy ion drivers
  • Gilson, E. P.; Davidson, R. C.; Efthimion, P. C.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 733 https://doi.org/10.1016/j.nima.2013.05.091
journal January 2014
Irradiation of materials with short, intense ion pulses at NDCX-II journal May 2017
Tomographic phase-space mapping of intense particle beams using solenoids journal December 2007
Physics of neutralization of intense high-energy ion beam pulses by electrons journal May 2010
Development and testing of a pulsed helium ion source for probing materials and warm dense matter studies journal February 2016
Generation of initial kinetic distributions for simulation of long-pulse charged particle beams with high space-charge intensity journal November 2009
New technique to measure emittance for beams with space charge journal August 2013

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