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Manifold Damping Of The Nlc Detuned Accelerating Structure
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Book Synopsis Manifold Damping of the NLC Detuned Accelerating Structure by :
Download or read book Manifold Damping of the NLC Detuned Accelerating Structure written by and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to investigate the reappearance of the HOM wakefield of a detuned accelerator structure and relax tolerance requirements, we propose to provide low level damping by coupling all cavities to several identical and symmetrically located waveguides (manifolds) which run parallel to each accelerator structure and are terminated at each end by matched loads. The waveguides are designed such that all modes which couple to the acceleration mode are non-propagating at the acceleration mode frequency. Hence the coupling irises can be designed to provide large coupling to higher frequency modes without damping the acceleration mode. Because the higher order modes are detuned, they are localized and have a broad spectrum of phase velocities of both signs. They are therefore capable of coupling effectively to all propagating modes in the waveguides. Methods of analyzing and results obtained for the very complex system of modes in the accelerating structure and manifolds are presented.
Book Synopsis A New Species of Desmodium from Peru by : Bernice Schubert
Download or read book A New Species of Desmodium from Peru written by Bernice Schubert and published by . This book was released on 1939 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis MANIFOLD DAMPING OF WAKEFIELDS IN HIGH PHASE ADVANCE LINACS FOR THE NLC. by :
Download or read book MANIFOLD DAMPING OF WAKEFIELDS IN HIGH PHASE ADVANCE LINACS FOR THE NLC. written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earlier RDDS (Rounded Damped Detuned Structures) [1,2], designed, fabricated and tested at SLAC, in collaboration with KEK, have been shown to damp wakefields successfully. However, electrical breakdown has been found to occur in these structures and this makes them inoperable at the desired gradient. Recent results [3] indicate that lowering the group velocity of the accelerating mode reduces electrical breakdown events. In order to preserve the filling time of each structure a high synchronous phase advance (150 degrees as opposed to 120 used in previous NLC designs) has been chosen. Here, damping of the wakefield is analyzed. Manifold damping and interleaving of structure cell frequencies is discussed. These wakefields impose alignment tolerances on the cells and on the structure as a whole. Tolerance calculations are performed and these are compared with analytic estimations.
Book Synopsis SCATTERING MATRIX ANALYSIS OF THE NLC ACCELERATING STRUCTURE. by :
Download or read book SCATTERING MATRIX ANALYSIS OF THE NLC ACCELERATING STRUCTURE. written by and published by . This book was released on 1999 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the Next Linear Collider (NLC)[1], long trains of short, intense bunches are accelerated through the linac on their way to the collision point. One serious problem that needs to be addressed is the multi-bunch, beam break-up instability in the linac. To counteract this instability the accelerating structures are designed so that the dipole mode wakefields are detuned and weakly damped. Detuning is accomplished by gradually varying the dimensions of the 206 cavity cells in each structure, and weak damping by surrounding the structure with four manifolds, which allow the dipole modes to weakly couple out of the cells. In order to design and predict the performance of such a structure in the NLC, it is necessary to be able to calculate accurately the strength of its long-range wakefields. NLC detuned structures were designed first using an equivalent circuit approach, for example, the double band model of Ref. [2]. With the introduction of weak damping, a more elaborate equivalent circuit approach was required[3]. Other methods that have been used for detuned structures are the open-mode, field expansion method[4], and a finite element calculation employing 206 parallel processors[5]. A scattering matrix method can also be applied to cavities that consist of a series of waveguide sections[6], such as the NLC structure, and such a method has also been applied to the problem of detuned accelerating [7], [8]. Among its natural strengths when applied to structure problems are the ability to model the effects of complicated 3 dimensional couplers and to investigate the behavior of higher passband modes. In this report we will employ a computer program that uses such an approach [9], to demonstrate that the scattering matrix method can yield accurate results concerning the wakefields of damped, detuned accelerating structures. We begin by calculating the dipole mode impedance and of a slightly simplified version of a detuned (DT) structure, results which we compare with those of the double circuit model. An important related problem is wakefield effect caused by internal structure misalignments, a problem which has the special difficulty of no longer being cylindrically symmetric; and we next study the transverse kicks to the beam caused by misaligning just one cell in a DT structure, and compare results with those of a perturbation calculation based on the circuit model. Finally, a future goal is to be able to use the scattering matrix formalism to model the more complicated NLC damped, detuned structure (DDS), and we present some preliminary results toward this goal.
Book Synopsis High Gradient Accelerating Structure - Proceedings Of The Symposium On The Occasion Of 70th Birthday Of Junwen Wang by : Wei Gai
Download or read book High Gradient Accelerating Structure - Proceedings Of The Symposium On The Occasion Of 70th Birthday Of Junwen Wang written by Wei Gai and published by World Scientific. This book was released on 2014-10-24 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume, for the symposium in honor of Junwen Wang's 70th anniversary, is dedicated to his many important achievements in the field of accelerator physics.It includes the discussions of recent advances and challenging problems in the field of high gradient accelerating structure development.
Book Synopsis Advanced Accelerator Concepts by : Paul Schoessow
Download or read book Advanced Accelerator Concepts written by Paul Schoessow and published by AIP Conference Proceedings (Nu. This book was released on 1995 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary purpose of the June 1994 workshop was to study new techniques for generating, accelerating, and colliding high energy beams. In addition to 17 invited papers, the proceedings include technical papers of the six working groups as well as summary papers by the chair of each group. The work
Download or read book Epac 96 written by S. Myers and published by CRC Press. This book was released on 1996-01-01 with total page 1054 pages. Available in PDF, EPUB and Kindle. Book excerpt: EPAC 96; Proceedings of the Fifth European Particle Accelerator Conference, Sitges (Barcelona), 10 to 14 June 1996, Three Volume Set, also available on a CD-ROM, provides a comprehensive overview of research, technology, and special applications in the field of accelerators. It serves as a source for novel ideas and familiarizes researchers with advanced concepts.
Book Synopsis High Energy Physics 99 Proceedings of the International Europhysics Conference on High Energy Physics, Tampere, Finland, 15-21 July 1999 by : K Huitu
Download or read book High Energy Physics 99 Proceedings of the International Europhysics Conference on High Energy Physics, Tampere, Finland, 15-21 July 1999 written by K Huitu and published by CRC Press. This book was released on 2000-01-01 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Energy Physics 99 contains the 18 invited plenary presentations and 250 contributions to parallel sessions presented at the International Europhysics Conference on High Energy Physics. The book provides a comprehensive survey of the latest developments in high energy physics. Topics discussed include hard high energy, structure functions, soft interactions, heavy flavor, the standard model, hadron spectroscopy, neutrino masses, particle astrophysics, field theory, and detector development.
Download or read book Proceedings written by and published by . This book was released on 1995 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Damped Detuned Structure for the Next Linear Collider by :
Download or read book A Damped Detuned Structure for the Next Linear Collider written by and published by . This book was released on 1996 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: An X-band Damped Detuned Structure (DDS) for NLC has been fabricated as part of a collaboration between KEK and SLAC. The individual cells were diamond point machined and microwave tested at KEK. The cells were diffusion bonded at SLAC. The structure has been cold tested. The time dependence of the beam induced dipole wakefields have been measured with the SLC beam in the test station ASSET. The structure is designed so that the dipole modes have an approximately gaussian density distribution in the frequency domain. This gives an approximately gaussian decrease of the wakefields for short times (about 10 ns), which is produced by the interference among the 206 modes in the lowest dipole mode band of the 206 cell structure. Without damping, however, the wakefields then rise back to a level which is approximately equal to the expected incoherent level from the 206 modes. The damping is accomplished by means of 4 rectangular slots or manifolds (approximately 5 mm by 10 mm) equally spaced in azimuth around the structure and running the full length of the structure. These manifolds act as single mode rectangular waveguides for the lowest band dipole modes, but are cut off for the accelerating mode. The manifolds are coupled to every cell in the structure, except for 3 at each end, by means of radial slots. Each of the four manifolds will have the dipole mode frequencies traveling in both directions and so are terminated on both ends. The structure will be installed in the NLC Test Accelerator this fall.
Book Synopsis Proceedings of the XVIII International Linear Accelerator Conference by :
Download or read book Proceedings of the XVIII International Linear Accelerator Conference written by and published by . This book was released on 1996 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CERN. written by and published by . This book was released on 1996 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1996 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Book Synopsis Proceedings of the 1995 Particle Accelerator Conference by :
Download or read book Proceedings of the 1995 Particle Accelerator Conference written by and published by . This book was released on 1996 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the 1999 Particle Accelerator Conference by :
Download or read book Proceedings of the 1999 Particle Accelerator Conference written by and published by . This book was released on 1999 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
