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Fast Transverse Beam Instability Caused By Electron Cloud Trapped In Combined Function Magnets
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Book Synopsis Fast Transverse Beam Instability Caused by Electron Cloud Trapped in Combined Function Magnets by : Sergey A. Antipov
Download or read book Fast Transverse Beam Instability Caused by Electron Cloud Trapped in Combined Function Magnets written by Sergey A. Antipov and published by Springer. This book was released on 2018-11-01 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents profound insights into the origins and dynamics of beam instabilities using both experimental observations and numerical simulations. When the Recycler Ring, a high-intensity proton beam accelerator at Fermi National Accelerator Laboratory, was commissioned, it became evident that the Recycler beam experiences a very fast instability of unknown nature. This instability was so fast that the existing dampers were ineffective at suppressing it. The nature of this phenomenon, alongside several other poorly understood features of the beam, became one of the biggest puzzles in the accelerator community. The author investigated a hypothesis that the instability arises from an interaction with a dense cloud of electrons accompanying the proton beam. He studied the phenomena experimentally by comparing the dynamics of stable and unstable beams, by numerically simulating the build-up of the electron cloud and its interaction with the beam, and by constructing an analytical model of an electron cloud-driven instability with the electrons trapped in combined-function dipole magnets. He has devised a method to stabilize the beam by a clearing bunch, which conclusively revealed that the instability is caused by the electron cloud, trapped in a strong magnetic field. Finally, he conducted measurements of the microwave propagation through a single dipole magnet. These measurements have confirmed the presence of the electron cloud in combined-function magnets.
Book Synopsis Fast Transverse Beam Instability Caused by Electron Cloud Trapped in Combined Function Magnets by :
Download or read book Fast Transverse Beam Instability Caused by Electron Cloud Trapped in Combined Function Magnets written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron cloud instabilities affect the performance of many circular high-intensity particle accelerators. They usually have a fast growth rate and might lead to an increase of the transverse emittance and beam loss. A peculiar example of such an instability is observed in the Fermilab Recycler proton storage ring. Although this instability might pose a challenge for future intensity upgrades, its nature had not been completely understood. The phenomena has been studied experimentally by comparing the dynamics of stable and unstable beam, numerically by simulating the build-up of the electron cloud and its interaction with the beam, and analytically by constructing a model of an electron cloud driven instability with the electrons trapped in combined function dipoles. Stabilization of the beam by a clearing bunch reveals that the instability is caused by the electron cloud, trapped in beam optics magnets. Measurements of microwave propagation confirm the presence of the cloud in the combined function dipoles. Numerical simulations show that up to 10$^{-2}$ of the particles can be trapped by their magnetic field. Since the process of electron cloud build-up is exponential, once trapped this amount of electrons significantly increases the density of the cloud on the next revolution. In a combined function dipole this multi-turn accumulation allows the electron cloud reaching final intensities orders of magnitude greater than in a pure dipole. The estimated fast instability growth rate of about 30 revolutions and low mode frequency of 0.4 MHz are consistent with experimental observations and agree with the simulations. The created instability model allows investigating the beam stability for the future intensity upgrades.
Book Synopsis Fast Instability Caused by Electron Cloud in Combined Function Magnets by :
Download or read book Fast Instability Caused by Electron Cloud in Combined Function Magnets written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the factors which may limit the intensity in the Fermilab Recycler is a fast transverse instability. It develops within a hundred turns and, in certain conditions, may lead to a beam loss. The high rate of the instability suggest that its cause is electron cloud. We studied the phenomena by observing the dynamics of stable and unstable beam, simulating numerically the build-up of the electron cloud, and developed an analytical model of an electron cloud driven instability with the electrons trapped in combined function di-poles. We found that beam motion can be stabilized by a clearing bunch, which confirms the electron cloud nature of the instability. The clearing suggest electron cloud trapping in Recycler combined function mag-nets. Numerical simulations show that up to 1% of the particles can be trapped by the magnetic field. Since the process of electron cloud build-up is exponential, once trapped this amount of electrons significantly increases the density of the cloud on the next revolution. In a Recycler combined function dipole this multi-turn accumulation allows the electron cloud reaching final intensities orders of magnitude greater than in a pure dipole. The estimated resulting instability growth rate of about 30 revolutions and the mode fre-quency of 0.4 MHz are consistent with experimental observations and agree with the simulation in the PEI code. The created instability model allows investigating the beam stability for the future intensity upgrades.
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.
Download or read book Fusion Energy Update written by and published by . This book was released on 1981 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974 with total page 1174 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 1994 with total page 804 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.
Book Synopsis EPAC96, Fifth European Particle Accelerator Conference by : S. Myers
Download or read book EPAC96, Fifth European Particle Accelerator Conference written by S. Myers and published by . This book was released on 1996 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses various invited papers including accelerators and storage rings, beam dynamics and electro-magnetic fields, and subsystems, technology and components. This volume also includes poster presentations of high-energy hadron accelerators and colliders.
Download or read book Plasma Physics Index written by and published by . This book was released on 1979 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Intensity and High Brightness Hadron Beams by : Weiren Chou
Download or read book High Intensity and High Brightness Hadron Beams written by Weiren Chou and published by American Institute of Physics. This book was released on 2002-11-20 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 20th ICFA Advanced Beam Dynamics Workshop took place from April 8 to 12, 2002 at Fermilab, co-sponsored by Fermilab and KEK. The theme of this workshop was "High Intensity and High Brightness Hadron Beams". The workshop covered a broad range of topics associated with such beams, including reviews of the performance of existing high-intensity hadron machines, overviews of planned high-intensity hadron sources and projects, presentations on accelerator physics issues, technical systems designs, and applications of these beams in high energy physics, nuclear physics, heavy ion fusion, medicine, industry, and other fields.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1992 with total page 1210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physics of Intensity Dependent Beam Instabilities by : King-Yuen Ng
Download or read book Physics of Intensity Dependent Beam Instabilities written by King-Yuen Ng and published by World Scientific. This book was released on 2006 with total page 795 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive treatment of intensity dependent particle beam instabilities in accelerating rings. Written for researchers, the material is also suitable for use as a textbook in an advanced graduate course for students studying accelerator physics. The presentation starts with a brief review of the basic concept of wake potentials and coupling impedances in the vacuum chamber followed by a discussion on static and dynamic solutions of their effects on the particle beams. Special emphasis is placed separately on proton and electron machines. Other special topics of interest covered include Landau damping, BalakinOCoNovokhatskyOCoSmirnov damping, Sacherer''s integral equations, Landau cavity, saw-tooth instability, Robinson stability criteria, beam loading, transition crossing, two-stream instabilities, and collective instability issues of isochronous rings. After the formulation of an instability, readers are provided a thorough description of one or more experimental observations together with a discussion of the cures for the instability. Although the book is theory oriented, the use of mathematics has been minimized. The presentation is intended to be rigorous and self-contained with nearly all the formulas and equations derived."
Download or read book Energy Research Abstracts written by and published by . This book was released on 1984 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings Ecloud'04 written by and published by . This book was released on 2005 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1991 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Documentation of Plasma Physics. Pt. 1, Experimental Plasma Physics [and] Theoretical Plasma Physics by :
Download or read book Documentation of Plasma Physics. Pt. 1, Experimental Plasma Physics [and] Theoretical Plasma Physics written by and published by . This book was released on 1975 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy written by and published by . This book was released on 1981 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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