Barnard, J.J.

Celata, C.M.

Grote, D.P.

Rose, D.V.

Sharp, W.M.

Welch, D.R.

Yu, S.S.

eScholarship - University of California

Lawrence Berkeley National LaboratoryRecent WorkTitleSimulation of beam compression for heavy-ion fusionPermalinkhttps://escholarship.org/uc/item/7jt5q8ttAuthorsSharp, W.M.Barnard, J.J.Grote, D.P.et al.Publication Date2004-06-28eScholarship.org Powered by the California Digital LibraryUniversity of CaliforniaAbstract Submittal Form31st IEEEInternational ConferenceOn Plasma ScienceJune 28-July 1, 2004Baltimore, MarylandSee page 14 for instructions on abstractpreparation.Session Topic: Inertial Confinement FusionSession Topic Number: 4.2 Prefer Oral Session X Prefer Poster Session No Preference Special r equests for  placement of thisabstract:           Special requests for equipment:           Signature:       Typed Name: William M SharpAffiliation/Institution/Company:Lawrence Livermore National LaboratoryMailing Address:PO Box 898 L-645City:  LivermoreState/Province: CAZip Code: 94551Country:  USAPhone: (510)486-6859Fax:  (510)486-5392E-mail:  wmsharp@lbl.govAbstract must be received no later thanFriday, January 16, 2004.  Please e-mailabstract to:  icops2004@pcm411.comIf e-mail is not available, then submit originaland two copies by mail to:  ICOPS2004  c/o Palisades Convention Management  411 Lafayette Street, Suite 201  New York, NY 10003-7032Abstracts received after the January 16, 2004deadline will be placed in a post-deadlinesession.The presenter must be a registered conferenceparticipant.  At least one author should beregistered to assure that the abstract appearsin the Conference Record - Abstracts book.Simulation of Beam Compression for Heavy-Ion Fusion*W. M. Sharp, J. J. Barnard, and D. P. Grote (LLNL)C. M. Celata and S. S. Yu (LBNL)D. V. Rose and D. R. Welch (MRC)Intense beams for heavy-ion inertial fusion (HIF) must becompressed by a factor of more than ten both in length and inradius between an induction accelerator and the inertial-fusiontarget. The compression scenario favored by the US HIFprogram is to first impose a head-to-tail velocity increase or“tilt,” so that the beam tail approaches the head in a “drift-compression” section. After this lengthwise compression, thebeam is focused radially by quadrupole magnets, so itconverges as it drifts to the target.Both compression stages raise important physics questions.Before drift-compression, the beam current and velocity mustbe carefully tailored so that the beam longitudinal space-chargefield removes the velocity tilt just as the beam enters the final-focus lattice. Transverse focusing in the drift compressionsection must be designed so that all parts of the beam remainapproximately matched as the beam expands to the larger radiusneeded for final focusing. The principle physics questions posedby this section are how much the total emittance grows, whethera beam halo develops, and how these processes scale with beamand lattice parameters. Radial focusing also poses challengesboth because of the high beam density required at the target andbecause collisional stripping by the background gas expected inthe chamber further increases the beam charge. Detailednumerical simulations with no external electron sources showan acceptable focal spot only for beam currents far below thevalues assumed in recent HIF reactor scenarios, so much recentwork has studied neutralization by low-density plasma just afterfinal focus. Here, the main physics questions involve the degreeand persistence of neutralization, the choice of optimum plasmaparameters, and the effects of photoionizaton by the heatedtarget.Recent theoretical work to model the final longitudinal andradial compression of a HIF beam is summarized in this paper.The three-dimensional electrostatic particle-in-cell (PIC) codeWARP3d is used to study beam transport in the drift-compression section, while transport in the fusion chamber ismodeled in using the electromagnetic PIC code LSP. Possiblelow-energy near-term experiments are investigated, as well asfull-scale fusion drivers, and for each accelerator category, weexamine how transport and error sensitivity scale with the majorbeam and lattice parameters.* This work was performed under the auspices of the U. S. Department ofEnergy by University of California Lawrence Livermore NationalLaboratory and Lawrence Berkeley National Laboratory under contracts W-7405-ENG-48 and DE-AC03-76SF00098, and by Mission ResearchCorporation under contract DE-AC02-76CH-03073.Place abstract within this 4.5 inch by 10.5 inch (11.5 cm by 27 cm) box or a photocopy of this form

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Simulation of beam compression for heavy-ion fusion

https://escholarship.org/uc/item/7jt5q8tt

Simulation of beam compression for heavy-ion fusion

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