New Computational Approaches To The N Body Problem With Applications To Electron Cooling Of Heavy Ion Beams

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New Computational Approaches to the N-body Problem with Applications to Electron Cooling of Heavy Ion Beams

Author : Pulukkuttige D. Sumana Abeyratne
Publisher :
ISBN 13 : 9781369538366
Total Pages : 225 pages
Book Rating : 4.5/5 (383 download)

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Book Synopsis New Computational Approaches to the N-body Problem with Applications to Electron Cooling of Heavy Ion Beams by : Pulukkuttige D. Sumana Abeyratne

Download or read book New Computational Approaches to the N-body Problem with Applications to Electron Cooling of Heavy Ion Beams written by Pulukkuttige D. Sumana Abeyratne and published by . This book was released on 2016 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thomas Jefferson National Accelerator Facility (JLab) has proposed a new Electron- Ion Collider, JLEIC. In this collider, a polarized electron beam and a counter rotating ion beam collide at the interaction point(s). A critical problem for the JLEIC collider is cooling the ion beam to ensure small emittance and to achieve high luminosity. Since electron cooling ---a method of cooling 'hot' ion beams through Coulomb interactions with 'cold' electron beams---is one of the most effective cooling methods, it will be used by JLEIC. However, the most naive way of calculating Coulomb forces through the pair-wise method becomes infeasible even with the most high performing computers since the computational complexity grows O(N2), where N is the number of particles as large as 1011. In this dissertation, we have developed new computational tools and a high performance computer code that allows, for the first time, a particle-based simulation of realistic electron cooling scenarios of heavy ion beams. Our toolset, collectively referred to as the Particles High-Order Adaptive Dynamics (PHAD), contains three specific tools. The first tool, the adaptive multi-level Fast Multipole Method, reduces the computational cost of computing Coulomb forces to only O(N). Our platform supports particles of any complex distribution (2D or 3D). The second tool, the Picard iteration-based integrator, resolves close encounters of particles efficiently and accurately. Finally, the third tool, the Strang operator splitting, reduces the runtime while maintaining the accuracy. The high performance code is comprised of these three main components. Although, the proposed toolset is both precise and fast, completely simulating the electron cooling of the ion beam still takes a long time on a modern computer cluster due to the millions of small time steps that needs to be simulated. In order to overcome this challenge, we have developed an MPI-parallel high performance computer code to speed up our simulations. The results gathered to date are for over one million time steps, which is less than 1% of the cooling time.

Ion Beam Cooling: Toward The Crystalline Beam - Proceedings Of The Workshop

Author : Akira Noda
Publisher : World Scientific
ISBN 13 : 9814487023
Total Pages : 251 pages
Book Rating : 4.8/5 (144 download)

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Book Synopsis Ion Beam Cooling: Toward The Crystalline Beam - Proceedings Of The Workshop by : Akira Noda

Download or read book Ion Beam Cooling: Toward The Crystalline Beam - Proceedings Of The Workshop written by Akira Noda and published by World Scientific. This book was released on 2002-12-20 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with recent topics in the field of ion beam cooling. Indications of one-dimensional ordering observed by electron beam cooling of highly charged heavy ion beams, and crystal beams observed by laser cooling at the RFQ storage ring, are presented together with theoretical and computational investigations on these phenomena. The approach to hot ion beam cooling is also discussed, from the viewpoint of application of the beam cooling technique.

Electron Cooling of Heavy Ion Beams

Author : D. Liesen
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (245 download)

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Book Synopsis Electron Cooling of Heavy Ion Beams by : D. Liesen

Download or read book Electron Cooling of Heavy Ion Beams written by D. Liesen and published by . This book was released on 1986 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

N-body Problems And Models

Author : Donald Greenspan
Publisher : World Scientific
ISBN 13 : 981448346X
Total Pages : 193 pages
Book Rating : 4.8/5 (144 download)

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Book Synopsis N-body Problems And Models by : Donald Greenspan

Download or read book N-body Problems And Models written by Donald Greenspan and published by World Scientific. This book was released on 2004-06-01 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study and application of N-body problems has had an important role in the history of mathematics. In recent years, the availability of modern computer technology has added to their significance, since computers can now be used to model material bodies as atomic and molecular configurations, i.e. as N-body configurations.This book can serve either as a handbook or as a text. Methodology, intuition, and applications are interwoven throughout. Nonlinearity and determinism are emphasized. The book can be used on any level provided that the reader has at least some ability with numerical methodology, computer programming, and basic physics. It will be of interest to mathematicians, engineers, computer scientists, physicists, chemists, and biologists.Some unique features of the book include: (1) development of turbulent flow which is consistent with experimentation, unlike any continuum model; (2) applicability to rotating tops with nonuniform density; (3) conservative methodology which conserves the same energy and momentum as continuous systems.

Innovative Computational Methods In Nuclear Many-body Problems - Towards A New Generation Of Physics In Finite Quantum Systems

Author : Hisashi Horiuchi
Publisher : World Scientific
ISBN 13 : 9814544728
Total Pages : 554 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Innovative Computational Methods In Nuclear Many-body Problems - Towards A New Generation Of Physics In Finite Quantum Systems by : Hisashi Horiuchi

Download or read book Innovative Computational Methods In Nuclear Many-body Problems - Towards A New Generation Of Physics In Finite Quantum Systems written by Hisashi Horiuchi and published by World Scientific. This book was released on 1998-09-02 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent rapid innovations in supercomputer technology are changing the concepts of numerical calculations employed in solving a wide variety of nuclear many-body problems. The purpose of the XVII RCNP International Symposium on Innovative Computational Methods in Nuclear Many-Body Problems (INNOCOM97) was to discuss the frontiers of various computational methods and to exchange ideas in wide fields of nuclear physics. The subjects discussed at the symposium covered almost all the areas of nuclear physics.

Final Report for 'ParSEC-Parallel Simulation of Electron Cooling."

Author : David L. Bruhwiler
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Final Report for 'ParSEC-Parallel Simulation of Electron Cooling." by : David L. Bruhwiler

Download or read book Final Report for 'ParSEC-Parallel Simulation of Electron Cooling." written by David L. Bruhwiler and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Department of Energy has plans, during the next two or three years, to design an electron cooling section for the collider ring at RHIC (Relativistic Heavy Ion Collider) [1]. Located at Brookhaven National Laboratory (BNL), RHIC is the premier nuclear physics facility. The new cooling section would be part of a proposed luminosity upgrade [2] for RHIC. This electron cooling section will be different from previous electron cooling facilities in three fundamental ways. First, the electron energy will be 50 MeV, as opposed to 100's of keV (or 4 MeV for the electron cooling system now operating at Fermilab [3]). Second, both the electron beam and the ion beam will be bunched, rather than being essentially continuous. Third, the cooling will take place in a collider rather than in a storage ring. Analytical work, in combination with the use and further development of the semi-analytical codes BETACOOL [4,5] and SimCool [6,7] are being pursued at BNL [8] and at other laboratories around the world. However, there is a growing consensus in the field that high-fidelity 3-D particle simulations are required to fully understand the critical cooling physics issues in this new regime. Simulations of the friction coefficient, using the VORPAL code [9], for single gold ions passing once through the interaction region, have been compared with theoretical calculations [10,11], and the results have been presented in conference proceedings papers [8,12,13,14] and presentations [15,16,17]. Charged particles are advanced using a fourth-order Hermite predictor corrector algorithm [18]. The fields in the beam frame are obtained from direct calculation of Coulomb's law, which is more efficient than multipole-type algorithms for less than {approx} 10{sup 6} particles. Because the interaction time is so short, it is necessary to suppress the diffusive aspect of the ion dynamics through the careful use of positrons in the simulations, and to run 100's of simulations with the same physical parameters but with different ''seeds'' for the particle loading. VORPAL can now be used to simulate other electron cooling facilities around the world, and it is also suitable for other accelerator modeling applications of direct interest to the Department of Energy. For example: (a) the Boersch effect in transport of strongly-magnetized electron beams for electron cooling sections, (b) the intrabeam scattering (IBS) effect in heavy ion accelerators, (c) the formation of crystalline beams and (d) target physics for heavy-ion fusion (HIF).

Electron Cooling for Low-energy RHIC Program

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (873 download)

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Book Synopsis Electron Cooling for Low-energy RHIC Program by :

Download or read book Electron Cooling for Low-energy RHIC Program written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron cooling was proposed to increase luminosity of the RHIC collider for heavy ion beam energies below 10 GeV/nucleon. Providing collisions at such energies, termed RHIC 'low-energy' operation, will help to answer one of the key questions in the field of QCD about existence and location of critical point on the QCD phase diagram. The electron cooling system should deliver electron beam of required good quality over energies of 0.9-5 MeV. Several approaches to provide such cooling were considered. The baseline approach was chosen and design work started. Here we describe the main features of the cooling system and its expected performance. We have started design work on a low-energy RHIC electron cooler which will operate with kinetic electron energy range 0.86-2.8 (4.9) MeV. Several approaches to an electron cooling system in this energy range are being investigated. At present, our preferred scheme is to transfer the Fermilab Pelletron to BNL after Tevatron shutdown, and to use it for DC non-magnetized cooling in RHIC. Such electron cooling system can significantly increase RHIC luminosities at low-energy operation.

Energy Research Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 544 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis Energy Research Abstracts by :

Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-06 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:

ELECTRON COOLING IN THE PRESENCE OF UNDULATOR FIELDS.

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis ELECTRON COOLING IN THE PRESENCE OF UNDULATOR FIELDS. by :

Download or read book ELECTRON COOLING IN THE PRESENCE OF UNDULATOR FIELDS. written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of the higher-energy cooler for Relativistic Heavy Ion Collider (RHIC) recently adopted a non-magnetized approach which requires a low temperature electron beam. However, to avoid significant loss of heavy ions due to recombination with electrons in the cooling section, the temperature of the electron beam should be high. These two contradictory requirements are satisfied in the design of the RWIC cooler with the help of the undulator fields. The model of the friction force in the presence of an undulator field was benchmarked vs. direct numerical simulations with an excellent agreement. Here, we discuss cooling dynamics simulations with a helical undulator, including recombination suppression and resulting luminosities.

Towards Demonstration of Electron Cooling with Bunched Electron Beam

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Towards Demonstration of Electron Cooling with Bunched Electron Beam by :

Download or read book Towards Demonstration of Electron Cooling with Bunched Electron Beam written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: All electron cooling systems which were in operation so far employed electron beam generated with an electrostatic electron gun in DC operating mode, immersed in a longitudinal magnetic field. At low energies magnetic field is also being used to transport electron beam through the cooling section from the gun to the collector. At higher energies (few MeV), it was shown that one can have simpler electron beam transport without continuous magnetic field. Because of a rather weak magnetic field on the cathode and in the cooling section the latter approach was referred to as 'non-magnetized cooling', since there was no suppression of the transverse angular spread of the electron beam with the magnetic field in the cooling section. Such a cooler successfully operated at FNAL (2005-11) at electron beam energy of 4.3 MeV. Providing cooling at even higher energies would be easier with RF acceleration of electron beam, and thus using bunched electron beam for cooling. Significant efforts were devoted to explore various aspects of such bunched electron beam cooling as part of R and D of high-energy electron cooling for RHIC. However, experimental studies of such cooling are still lacking. Establishing this technique experimentally would be extremely useful for future high-energy applications. Presently there is an ongoing effort to build Proof-of-Principle (PoP) experiment of Coherent Electron Cooling (CEC) at RHIC, which promises to be superior to conventional electron cooling for high energies. Since the CEC experiment is based on bunched electron beam and it has sections where electron beam co-propagates with the ion beam at the same velocity, it also provides a unique opportunity to explore experimentally conventional electron cooling but for the first time with a bunched electron beam. As a result, it allows us to explore techniques needed for the high-energy electron cooling such as 'painting' with a short electron beam and control of ion beam distribution under cooling which is essential if cooling is provided in a collider. The software needed for comparison with the experiments is already developed as part of the previous high-energy electron cooling studies for RHIC. Since electron beam will be non-magnetized and there will be no magnetic field in the cooling section it will be also a first demonstration of fully non-magnetized cooling. The purpose of these studies was to explore whether we would be able to observe conventional electron cooling with parameters expected in the CEC PoP experiment. Below we summarize requirements on electron beam and cooling section needed for such demonstration.

Analytical Studies of Coherent Electron Cooling

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Analytical Studies of Coherent Electron Cooling by :

Download or read book Analytical Studies of Coherent Electron Cooling written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Under certain assumptions and simplifications, we studied a few physics processes of Coherent Electron Cooling using analytical approach. In the modulation process, the effect due to merging the ion beam with the electron beam is studied under single kick approximation. In the free electron laser (FEL) amplifier, we studied the amplification of the electron density modulation using 1D analytical approach. Both the electron charge density and the phase space density are derived in the frequency domain. The solutions are then transformed into the space domain through Fast Fourier Transformation (FFT).

Nuclear Science Abstracts

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Publisher :
ISBN 13 :
Total Pages : 912 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis Nuclear Science Abstracts by :

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976-04 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:

MEIC Electron Cooling Simulation Using Betacool

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis MEIC Electron Cooling Simulation Using Betacool by :

Download or read book MEIC Electron Cooling Simulation Using Betacool written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron cooling of ion beams is the most critical R & D issue in Jefferson Lab's MEIC design. In the ion collider ring, a bunched electron beam driven by an energy-recovery SRF linac assisted by a circulate ring will be employed to cool protons or ions with energies up to 100 GeV/u, a parameter regime that electron cooling has never been applied. It is essential to understand how efficient the electron cooling is, particularly in the high energy range, to confirm the feasibility of the design. Electron cooling is also important in LEIC design although the ion energy is 25 GeV/u, lower than MEIC. In this paper, we will present first results of the simulation studies of electron cooling processes in the collider ring of both MEIC and LEIC using BETACOOL code.

Scientific and Technical Aerospace Reports

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Publisher :
ISBN 13 :
Total Pages : 456 pages
Book Rating : 4.:/5 (3 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

High Energy Physics Index

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Publisher :
ISBN 13 :
Total Pages : 602 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis High Energy Physics Index by :

Download or read book High Energy Physics Index written by and published by . This book was released on 1986 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Verhael van het scheep-gevecht, voor Bergen in Noordwegen. Op den 10 Augusti, 1665

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Publisher :
ISBN 13 :
Total Pages : 2 pages
Book Rating : 4.:/5 (71 download)

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Book Synopsis Verhael van het scheep-gevecht, voor Bergen in Noordwegen. Op den 10 Augusti, 1665 by :

Download or read book Verhael van het scheep-gevecht, voor Bergen in Noordwegen. Op den 10 Augusti, 1665 written by and published by . This book was released on 1665 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

MEIC Electron Cooling Program

Author :
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (94 download)

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Book Synopsis MEIC Electron Cooling Program by :

Download or read book MEIC Electron Cooling Program written by and published by . This book was released on 2014 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cooling of proton and ion beams is essential for achieving high luminosities (up to above 1034 cm-2s-1) for MEIC, a Medium energy Electron-Ion Collider envisioned at JLab [1] for advanced nuclear science research. In the present conceptual design, we utilize the conventional election cooling method and adopted a multi-staged cooling scheme for reduction of and maintaining low beam emittances [2,3,4]. Two electron cooling facilities are required to support the scheme: one is a low energy (up to 2 MeV) DC cooler installed in the MEIC ion pre-booster (with the proton kinetic energy up to 3 GeV); the other is a high electron energy (up to 55 MeV) cooler in the collider ring (with the proton kinetic energy from 25 to 100 GeV). The high energy cooler, which is based on the ERL technology and a circulator ring, utilizes a bunched electron beam to cool bunched proton or ion beams. To complete the MEIC cooling concept and a technical design of the ERL cooler as well as to develop supporting technologies, an R & D program has been initiated at Jefferson Lab and significant progresses have been made since then. In this study, we present a brief description of the cooler design and a summary of the progress in this cooling R & D.