Copyright © 1979, by the Author(S). All Rights Reserved
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Copyright © 1979, by the author(s). All rights reserved. Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission. INFORMAL CONFERENCE ON PARTICLE AND HYBRID CODES FOR FUSION by C. K. Birdsall and A. Friedman (Coordinators) Memorandum No. UCB/ERL M79/79 December 10 and 11, 1979 Napa, California ELECTRONICS RESEARCH LABORATORY College of Engineering University of California, Berkeley 94720 / •^% Research sponsored by the Department of Energy Contract DE-AS03-76F00034- DE-AT03-76ET53064. PURPOSE INFORMAL CONFERENCE OK PARTICLE AND HYHRID CODES FOR FUSION This conference was held in order to facilitate an exchange of ideas December 10, 11, 1<<7? and results on plasma particle and particle-fluid hybrid codes in an Informal, Napa, California unpublished manner, with frank and open discussion among about fifty people. The only printed record is this collection of copies of transparencies used CONTENTS by the thirty-five speakers. In keeping with this informality, the results presented here are being distributed to the participants only and are not I Purpose to be quoted without explicit permission from the author. II Attendees In December 197I1 a similar unpublished conference was held in Berkeley III Schedule at the request of Robert Price of ERDA. The present conference is a follow-up IV Panel Discussion and is due in large part to the interest of David Nelson (Chief, Fusion V Conclusions; Recommendations Theory and Computer Services Branch, Div. Applied Plasma Physics,Office of VI Papers Fusion Energy, DOE). Dr. Nelson presented his view from DOE of contributions by computation and simulation toward furthering plasma research leading to ACKNOWLEDGMENTS fusion reactors; he received considerable feedback from participants. We This conference was conceived during a telephone call with David are most grateful to him for his active and stimulating participation. Nelson at DOE roughly two months ago. His suggestions as to purpose The conference is also due to the pressure of accumulated interest and focus, as well as his active participation in the meetings are among those who work with particle and hybrid codes, who wished to exchar.je acknowledged most gratefully. new ideas, methods and results, in an informal setting. By no means was My colleague, Alex Friedman, has been invaluable in all stages of this meeting intended to conflict with the Ninth Conference on Numerical conference preparation, from the suggestion of topics to be covered, and Simulation of Plasmas scheduled for June 30 - July 2, I98O at Northwestern their grouping, consultation with many outside Berkeley, LBL, and I.LL, University, sponsored by Professors J. Denavit and C. Knorr, which covers the formulation cf Invitations, to many details of the meeting itself. I a much wider area and is to be published. am most grateful for his help. Lastly, the particle-hybrid code community had concern that the very Giiiger Pletcher, my part time assistant, devoted nearly all of her real contributions of particle and particle-fluid simulations to the under time for two months to finding a suitable meeting place near Berkeley standing of fusion plasmas, in support of both theory and.experiment, might (but far enough away to keep participants from straying to LBL, LLL, just have been underestimated in Washington. This conference is, in part, Stanford etc. during the meetings) for the meetings and a pleasant a reaction to recommendations of the DOE committee for computer time place for the conference dinner. She also did the typing, letter writing, allocations for FY80 which included: major labs receiving 63^ of their and mailing to the potential and actual participants (with help from requests, but universities receiving only Uo£; the decision that large Steve Au Yeung on the initial computer mailing), made many phono calls to particle pushing or kinetic codes can be afforded only sparingly; basic ensure that the details of the conference were handled properly, and plasma theory was given approximately a 20^ absolute cut; ability to follow arranged the get-together Sunday evening. We owe Cinger an immense out unexpected results was cut to a bare minimum; studies of alternate vote of thanks for her help. concepts were cut more than were mainline studies. The challenges to the My thanks go to the speakers and panelists for their excellent community are clear: make our contributions known; make our codes more presentations, which are already stimulating us to better work. The efficient in terms useful physics per unit of computer time (optimize, interchange of ideas that was sought was achieved; the interaction with use minimum number of dimensions and particles etc.); check code physics David Nelson that was desired was also achieved. C. K. Blrdsall Berkeley, Dec. 17, '979 -r-r r T~ PURPOSE (continued) by analysis (time and spatial grid effects, fluctuations) and by com Final Schedule for parison with known linear and noalinear results so as to increase confidence Informal Conference on Particle and Hybrid Codes for Fusion December 10-11, 1979, Napa. California in the simulations. Editorially we note that the field has matured considerably from the Conference coordinated by Charles K. (Ned) Blrdsall, Alex Friedman, assisted by Ginger PI etcher, at the Electrical Engineering and early desk calculator work of Duneman and'Itartree on magnetrons in the early Computer Science Department, University of California, Berkeley 911720 19'tO's, the one demensional electrostatic plasma work on modern computers by Buncman and Dawson in the late 1950'a, to the current 3d fully electro There will be four main sessions. Talks will be 20. 15 and 10 minutes with adequate time for discussion. If certain subjects draw magnetic codes of Buneoan and others. The early art has become more of a great interest, additional time will be available. science. Simulation for magnetic fusion has now become strongly applications Of general interest is the efficiency of particle and particle- oriented, with DOE devoting the bulk of FY 60 computing resources to the fluid codes, in terms of physics output per unit of computer resource direct support of existing experiments and the design of next generation (time, memory, volume of output, etc.). Of comparable interest Is the progress toward working at lower and lower frequencies, with larger mass devices, Including calculations of transport, impurities, heating, stability, ratios, eto. equilibrium, coil design etc.,a milestone-Indeed. Coupled with this new emphasis Is the current plateau in large computer time for magnetic fusion, with no relief planned until at least summer I98I. These factors present HONDAT. DECEMBER 10 Session 1A - 8:30 am to 12:00 noon Chairperson: C. Nlelson a challenge to all of us to be aore efficient and more effective in our siitulations. * Long-time-averaging (LTA). Particle simulation or slow transport phenomena. " Particle KHD vis a vis fluid MUD and other fluid codes. * Large time step problems (ml/me>>1, omega dt»1, digital filtering, stiff equation Integrators). Co-ordlnators: C. K. (tied) Blrdsall Alex Friedman U. C. Berkeley, December 17, 1979 Paper 1 J. Denavlt, T. L. Crystal, C. E. Rathmsnn, J. L. Vomvorldls. "Appllca- E|9£ *~ tlons of Long-Time-Scale Particle Simulations." 2 B. Cohen, R. P. Frels, T. A. Brengle, "An Orbit-Averaged Particle Code." 22 3 W. Fawley. "Low Pass Filtering In Time." 44 ^ D. Anderson, "Toward a Full 3d Hybrid Transport Code." 51 5 T. Tajlma, J. H. LeBoef, F. Brunei, J. H. Dawson, "Recent Efforts in 56 ~ Particle HUD Code Development." 7 H. Gkuda. "Steady State Drift Turbulence and Anomalous Diffusion, 3d." 101 6 C. K. Chu, "Vortex Ring Formation by Vortex-ln-Cell Method." 93 9 C. Toll, "Code Exchange Mechanics." 121 ft B. t'cFanara, "Remarks on the Use of Integrals of Motion" 120 CONFERENCE ATTENDEES AND ADDRESSES Dr. W.W. Lee Dr. J. W. Poukey Princeton Plasma Physics Laboratory Division 521*1 Princeton, New Jersey 085>»0 Sandla Laboratories Dr. Jones H. Albritton L-477 Albuquerque, New Mexico 87115 Lawrence Llvermore Laboratory Dr. Kent Estabrook I.U77 Dr. Paulett Liewer P.O. Box 808 Dr. Jeff Ojiintenz Liveroore, Ca. 9U550 Lawrence Llvermore Laboratory Physics Department P.O. Box 80S University,.of California, Los Angelea Division 52>«1 Los Angeles, California 90021* Sandla Laboratories Dr. David Anderson Liveroore, Ca. 91*550 Albuquerque , New Mexico 87115 L-«»39 Dr. William Fawley Dr. Irv Lindeouth Laurence Llvermore Laboratory Dr. Abraham Sternlleb Liveroore, California 9>)558 L-»»39 Los Alamos Scientific Laboratory Lawrence Liveroore Laboratory P.O. Box 1663 Physics and Astronomy Department Los Alamos, New Mexico 875^5 University of Maryland Dr. Robert Berman P.O. Box 808 College Park, Md. 207*40 36-227 Liveroore, Ca. 91*550 Dr. Rodney Mason Massachusetts Institute of Technology Dr. T. Tajima Cambridge, Ma. 02139 Dr. Charles Finan Los Alamos Scientific Laboratory L-22 P.O. Box I663 Physics Department Los Alamos, New Mexico 975**5 University of California, Los Angeles Dr. Oscar fttn^mnn Lawrence Llvermore Laboratory Los Angeles, Ca. 9002U ERL P.O. Box 808 Liveroore, Ca. 91*550 Dr. Yoshi Matsuda Stanford University Dr. Carol Tull Stanford, California 91*305 L-l*39 Dr. Bob Fries Lawrence Liveroore Laboratory L-l*02, Bldg. 219, Room 108 Lawrence Liveroore Laboratory Dr. Jack Byers L-J»39 P.O. Box 808 Liveroore, Ca. 9*550 P.O. Box 806 t-^39, Bldg. 315, Rm. 285 Lavrence Liveroore Laboratory Liveroore, Ca. 9^550 Laurence Llvermore Laboratory P.O. Box 80S Liveroore, Ca.