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Author : International Committee for Future Accelerators
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (8 download)
Download or read book Low Emittance Electron and Positron Beams written by International Committee for Future Accelerators and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (682 download)
Download or read book Science and Applications of Low-emittance Electron Beams written by and published by . This book was released on 2000 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The capability of making very low-emittance electron beams of temporally short, high charge bunches has opened up exciting new possibilities in basic and applied science. Two notable applications are high energy electron-positron linear colliders for particle physics, and fourth-generation light sources consisting of linac-driven Free-Electron Lasers (FEL), both of which represent significant programmatic potential for the Laboratory in the future. The technologies contributing to low-emittance electron beams and their applications, namely precision fabrication, ultra-short pulse lasers, and RF photocathode injectors, are all areas of Lab expertise, and the work carried out under this LDRD project further expanded our core-competency in advanced concept accelerators. Furthermore, high energy accelerators have become a cornerstone of the SBSS program, as illustrated by the recent development of proton radiography as a prime technology candidate for the Advanced Hydrotest Facility (AHF), which enhanced the significance of this project all the more. This was a one-year project to both advance the technology of, and participate in the science enabled by very low-emittance electron beams. The work centered around the two themes above, namely electron-positron linear colliders, and the new fourth-generation light sources. This work built upon previous LDRD investments, and was intended to emphasize accelerator physics experiments.
Author : Rodion Tikhoplav
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783838394091
Total Pages : 156 pages
Book Rating : 4.3/5 (94 download)
Download or read book Low Emittance Electron Beams written by Rodion Tikhoplav and published by LAP Lambert Academic Publishing. This book was released on 2010-08 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Humans are never satisfied with what has been accomplished. There is always a desire to extend the horizons of knowledge even farther. To satisfy the scientific curiosity, as well as to push our civilization forward by investigating new physics phenomena, we need to continue improving the devices at our disposal, including high energy particle accelerators. To pave a road for a new accelerator development, beam characterization needs to be undertaken including studies of the properties of low emittance electron beams produced by laser pulses incident onto an rf gun photocathode such as described in this book. The experimental results discussed here were carried out at the A0 photoinjector at Fermilab. Such beam studies are especially important for fixing the design of new linear colliders as well as for the development of free electron lasers.
Author : Helmut Wiedemann
Publisher : Springer Science & Business Media
ISBN 13 : 3662029030
Total Pages : 457 pages
Book Rating : 4.6/5 (62 download)
Download or read book Particle Accelerator Physics written by Helmut Wiedemann and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle Accelerator Physics covers the dynamics of relativistic particle beams, basics of particle guidance and focusing, lattice design, characteristics of beam transport systems and circular accelerators. Particle-beam optics is treated in the linear approximation including sextupoles to correct for chromatic aberrations. Perturbations to linear beam dynamics are analyzed in detail and correction measures are discussed, while basic lattice design features and building blocks leading to the design of more complicated beam transport systems and circular accelerators are studied. Characteristics of synchrotron radiation and quantum effects due to the statistical emission of photons on particle trajectories are derived and applied to determine particle-beam parameters. The discussions specifically concentrate on relativistic particle beams and the physics of beam optics in beam transport systems and circular accelerators such as synchrotrons and storage rings. This book forms a broad basis for further, more detailed studies of nonlinear beam dynamics and associated accelerator physics problems, discussed in the subsequent volume.
Author : Rodion Tikhoplav
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (72 download)
Download or read book Low Emittance Electron Beam Studies written by Rodion Tikhoplav and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Paul G Coleman
Publisher : World Scientific
ISBN 13 : 9814496383
Total Pages : 348 pages
Book Rating : 4.8/5 (144 download)
Download or read book Positron Beams And Their Applications written by Paul G Coleman and published by World Scientific. This book was released on 2000-01-22 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a coherent and comprehensive overview of the generation and application of mono-energetic positron beams. It has been written by acknowledged experts, at a level accessible to graduate students working, or planning to work, with positron beams, and to scientists in other areas who want to know something about the field.The book begins with a brief historical introduction and an overview of how positron beams are generated and transported. A description of the fate of slow positrons in gaseous and condensed matter, with reference to many of the fundamental measurements made possible by the advent of positron beams, is followed by a discussion on applications in the study of solid surfaces, defect profiling in subsurface regions, interfaces and thin films, and the probing of bulk properties in novel ways. The book ends with a look at the future, considering the prospects for intense positron beams and their potential for further research.
Author :
Publisher :
ISBN 13 :
Total Pages : 251 pages
Book Rating : 4.:/5 (16 download)
Download or read book The Generation and Acceleration of Low Emittance Flat Beams for Future Linear Colliders written by and published by . This book was released on 1991 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many future linear collider designs call for electron and positron beams with normalized rms horizontal and vertical emittances of????????? = 3×10−6 m-rad and??{sub y} = 3×10−8 m-rad; these are a factor of 10 to 100 below those observed in the Stanford Linear Collider. In this dissertation, we examine the feasibility of achieving beams with these very small vertical emittances. We examine the limitations encountered during both the generation and the subsequent acceleration of such low emittance beams. We consider collective limitations, such as wakefields, space charge effects, scattering processes, and ion trapping; and also how intensity limitations, such as anomalous dispersion, betatron coupling, and pulse-to-pulse beam jitter. In general, the minimum emittance in both the generation and the acceleration stages is limited by the transverse misalignments of the accelerator components. We describe a few techniques of correcting the effect of these errors, thereby easing the alignment tolerances by over an order of magnitude. Finally, we also calculate fundamental'' limitations on the minimum vertical emittance; these do not constrain the current designs but may prove important in the future.
Author : Walter E Kauppila
Publisher : World Scientific
ISBN 13 : 9813201851
Total Pages : 373 pages
Book Rating : 4.8/5 (132 download)
Download or read book Positron (Electron): Gas Scattering - Proceedings Of The 3rd International Workshop written by Walter E Kauppila and published by World Scientific. This book was released on 1986-04-01 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: This workshop discusses the current state and future directions of research in positron — gas scattering, particularly in the relationship between positron and electron scattering by the same atoms and molecules. The possible applications of positron — gas scattering to astrophysical phenomena have also been discussed.
Author : E. H. Ottewitte
Publisher : World Scientific Publishing Company
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.:/5 (45 download)
Download or read book 1987 Workshop on Intense Positron Beams written by E. H. Ottewitte and published by World Scientific Publishing Company. This book was released on 1988 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D A Bradley
Publisher : World Scientific
ISBN 13 : 9814542725
Total Pages : 698 pages
Book Rating : 4.8/5 (145 download)
Download or read book Frontiers Of Physics 1998, Proceedings Of The Intl Mtg written by D A Bradley and published by World Scientific. This book was released on 2000-11-24 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents:Progress of RFQ and Superconducting Accelerators in China (C E Chen et al.)QCD Phase Transition in the Laboratory and in the Early Universe (B Sinha)Frontiers in Ultrafast Laser Science (W Sibbett)Asymmetries of Sea Quark Distributions in Baryons (M Alberg et al.)A Variational Approach to Many-Particle Systems (C K Kim et al.)Synchrotron Radiation Activities at KEK (M Kihara)Results of the UNU/ICTP PFF Network (S Lee)New Generation Positron-Atom Scattering Theories (K Ratnavelu)Superconducting Pairing of Quarks in QCD (N V Hieu & L T Tuong)Photon-Gated Persistent Spectral Hole Burning (Y X Nie & L Z Zhao)Wind Driven Circulation of the South China Sea (A Camerlengo)Effect of Soil Type on Environmental Terrestrial Gamma Radiation Dose in Johor State, Malaysia (A T Ramli et al.)Research in Optical Fibres Devices at Telekom Malaysia Photonics Laboratory (H B Ahmad et al.)Simplifying Complexity (W A T Wan Abdullah)Gravitational Wave Detection in the Laboratory (Y T Chen et al.)and other papers Readership: Theoretical physicists.
Download or read book Low-emittance Monoenergetic Electron and Ion Beams from Ultra-intense Laser-solid Interactions written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experiments at the LLNL Petawatt Laser have demonstrated the generation of intense, high energy beams of electrons and ions from the interaction of ultra-intense laser light with solid targets. Focused laser intensities as high as 6 x 102° W/cm2 are achieved, at which point the quiver energies of the target electrons extend to (almost equal to)10 MeV. In this new, fully relativistic regime of laser-plasma interactions, nuclear processes become important and nuclear techniques are required to diagnose the high-energy particle production. In recent experiments we have observed electrons accelerated to 100 MeV, up to 60 MeV brehmsstrahlung generation, photo-nuclear fission and positron-electron pair creation. We also have observed monoenergetic jets of electrons having sufficiently small emittance to be interesting as a laser-accelerated beam, if the production mechanism could be understood and controlled. The huge flux of multi-MeV ponderomotively accelerated electrons produced in the laser-solid interaction is also observed to accelerate contaminant ions from the rear surface of the solid target up to 50 MeV. We describe spectroscopic measurements which reveal intense monoenergetic beam features in the proton energy spectrum. The total spectrum contains>1013 protons, while the monoenergetic beam pulses contain (almost equal to)1 nC of protons, and exhibits a longitudinal and transverse emittance smaller than conventional RF proton accelerator beams.
Author : James Patrick Shanks
Publisher :
ISBN 13 :
Total Pages : 366 pages
Book Rating : 4.:/5 (88 download)
Download or read book Low-emittance Tuning at CesrTA written by James Patrick Shanks and published by . This book was released on 2013 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Linear Collider (ILC) is a proposed 500GeV center-of-mass electron/positron collider. In order to meet luminosity requirements, low-emittance beams must be provided at the start of the two 15-km main linacs. These low-emittance beams will be provided by damping rings, whose optics must be well-corrected in order to minimize dilution of the vertical emittance. In 2008 the Cornell Electron/Positron Storage Ring (CESR) was reconfigured from an electron/positron collider to the CESR Test Accelerator (CesrTA), to serve as a testbed for the ILC damping rings. One of the primary research objectives of the CesrTA project is to explore beam-based optics correction techniques for application at the ILC damping rings. The geometric emittance target for CesrTA is
Author : Tor O. Raubenheimer
Publisher :
ISBN 13 :
Total Pages : 662 pages
Book Rating : 4.F/5 ( download)
Download or read book The Generation and Acceleration of Low Emittance Flat Beams for Future Linear Colliders written by Tor O. Raubenheimer and published by . This book was released on 1991 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Paul G. Coleman
Publisher : World Scientific
ISBN 13 : 9789810233945
Total Pages : 348 pages
Book Rating : 4.2/5 (339 download)
Download or read book Positron Beams and Their Applications written by Paul G. Coleman and published by World Scientific. This book was released on 2000 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a coherent and comprehensive overview of the generation and application of mono-energetic positron beams. It has been written by acknowledged experts, at a level accessible to graduate students working, or planning to work, with positron beams, and to scientists in other areas who want to know something about the field.The book begins with a brief historical introduction and an overview of how positron beams are generated and transported. A description of the fate of slow positrons in gaseous and condensed matter, with reference to many of the fundamental measurements made possible by the advent of positron beams, is followed by a discussion on applications in the study of solid surfaces, defect profiling in subsurface regions, interfaces and thin films, and the probing of bulk properties in novel ways. The book ends with a look at the future, considering the prospects for intense positron beams and their potential for further research.
Author : James B Rosenzweig
Publisher : World Scientific
ISBN 13 : 9814483443
Total Pages : 563 pages
Book Rating : 4.8/5 (144 download)
Download or read book Physics And Applications Of High Brightness Electron Beams, The - Proceedings Of The Icfa Workshop written by James B Rosenzweig and published by World Scientific. This book was released on 2003-12-18 with total page 563 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the contributions to the Workshop on the Physics and Applications of High Brightness Electron Beams, held in July 2002 in Sardinia, Italy. This workshop had a broad international representation from the fields of intense electron sources, free-electron lasers, advanced accelerators, and ultra-fast laser-plasma, beam-plasma and laser-beam physics. The interdisciplinary participants were brought together to discuss advances in the creation and understanding of ultra-fast, ultra-high brightness electron beams, and the unique experimental opportunities in frontier high-energy-density and radiation-source physics which are offered by these scientific tools.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings® (ISTP® / ISI Proceedings)• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)
Download or read book Injection, Positron and Electron Beam Generation written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to produce the desired luminosity it is required to generate a large number of positrons, namely N+ = 2 ̦ 5 x 101° positrons per bunch at a repetition rate of 3 + 12 KHz. These specifications are very demanding and well above the present state of the art. e/e− conversion in a high Z target is performed with an overall efficiency, [eta], of at most 7%/GeV, including e capture and acceleration efficiencies. The value refers to a situation where all positrons in an energy bite, [Delta][Epsilon], of about 15 MeV are captured. About 15 MeV is therefore the positron beam absolute energy spread. Higher efficiencies can be obtained at the expense of increasing [Delta][Epsilon], but the resulting beam absolute energy spread would not be accepted by the following stages of the machine. In order to limit the charge in the primary electron bunch so as to avoid too strong an interaction with the accelerating structure, and taking into account the fact that the conversion efficiency is proportional to the energy of the electrons, it is advisable to convert electrons into positrons at the highest possible energy. Another important design parameter that determines the minimum energy to which positrons have to be accelerated before being injected into the machine is the maximum relative energy spread tolerated by the first recirculation arc; it has been assumed throughout that it is at most 4%. Given the absolute energy spread of the positrons at production and folding-in the spread induced by the interaction of the bunch with the accelerating structure, the minimum energy of the positron beam entering the first recirculation arc cmes out to be about 450 MeV. Since before entering the arc the beam passes once through one side of the machine accelerating structure, thereby gaining 350 Me, it has to be accelerated by the injection linac following the converter to at least 100 MeV. A one-sided race track acceleration scheme could be considered. Another fundamental design specification that has to be dealt with at injection level concerns the possibility of producing electron beams with an emittance to match that specified for the beams in collision (namely a normalized emittance [epsilon]{sub n} {=} 2 x 10−6 mrad) in order to save the complication and expense of passing through a damping ring. For positrons this is not possible since they are of course created with a very large emittance and a damping ring is mandatory. Values of the normalized emittance as small as the specified can only be obtained by careful design and require an improvement over what is commonly achieved by a factor {=} 3.
Author :
Publisher :
ISBN 13 :
Total Pages : 153 pages
Book Rating : 4.:/5 (684 download)
Download or read book Radiative Cooling of Relativistic Electron Beams written by and published by . This book was released on 1998 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern high-energy particle accelerators and synchrotron light sources demand smaller and smaller beam emittances in order to achieve higher luminosity or better brightness. For light particles such as electrons and positrons, radiation damping is a natural and effective way to obtain low emittance beams. However, the quantum aspect of radiation introduces random noise into the damped beams, yielding equilibrium emittances which depend upon the design of a specific machine. In this dissertation, the author attempts to make a complete analysis of the process of radiation damping and quantum excitation in various accelerator systems, such as bending magnets, focusing channels and laser fields. Because radiation is formed over a finite time and emitted in quanta of discrete energies, he invokes the quantum mechanical approach whenever the quasiclassical picture of radiation is insufficient. He shows that radiation damping in a focusing system is fundamentally different from that in a bending system. Quantum excitation to the transverse dimensions is absent in a straight, continuous focusing channel, and is exponentially suppressed in a focusing-dominated ring. Thus, the transverse normalized emittances in such systems can in principle be damped to the Compton wavelength of the electron, limited only by the Heisenberg uncertainty principle. In addition, he investigates methods of rapid damping such as radiative laser cooling. He proposes a laser-electron storage ring (LESR) where the electron beam in a compact storage ring repetitively interacts with an intense laser pulse stored in an optical resonator. The laser-electron interaction gives rise to rapid cooling of electron beams and can be used to overcome the space charge effects encountered in a medium energy circular machine. Applications to the designs of low emittance damping rings and compact x-ray sources are also explored.
