Transverse Matching Progress of the SNS Superconducting Linac PDF Download
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Languages : en
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Experience using laser-wire beam profile measurement to perform transverse beam matching in the SNS superconducting linac is discussed. As the SNS beam power is ramped up to 1 MW, transverse beam matching becomes a concern to control beam loss and residual activation in the linac. In our experiments, however, beam loss is not very sensitive to the matching condition. In addition, we have encountered difficulties in performing a satisfactory transverse matching with the envelope model currently available in the XAL software framework. Offline data analysis from multi-particle tracking simulation shows that the accuracy of the current online model may not be sufficient for modeling the SC linac.
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Languages : en
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Book Description
Experience using laser-wire beam profile measurement to perform transverse beam matching in the SNS superconducting linac is discussed. As the SNS beam power is ramped up to 1 MW, transverse beam matching becomes a concern to control beam loss and residual activation in the linac. In our experiments, however, beam loss is not very sensitive to the matching condition. In addition, we have encountered difficulties in performing a satisfactory transverse matching with the envelope model currently available in the XAL software framework. Offline data analysis from multi-particle tracking simulation shows that the accuracy of the current online model may not be sufficient for modeling the SC linac.
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Languages : en
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The Spallation Neutron Source (SNS) makes use of superconducting cavities for the acceleration of negative H ions in the main linac. Two types of 6-cell Niobium cavities are used in the superconducting portion of the linac: 33[beta]=0.61 cavities and 48[beta]=0.81 cavities. Each cavity is powered via a coaxial fundamental power coupler (FPC) of a simple yet robust design. The electromagnetic design of the main components of that coupler has been modeled and some of those properties have been measured experimentally. Modeling includes impedance matching of the window and of the waveguide to coaxial doorknob transition; coupling of the coupler fields to the cavity fields; and multipacting behavior of the coaxial line and window. Various aspects of design, simulation, and testing on the coupler and cavity are presented.
Author: Thomas P. Wangler
Publisher: John Wiley & Sons
ISBN: 9783527406807
Category : Science
Languages : en
Pages : 476
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Book Description
Dieses einschlägige Lehrbuch, entwickelt auf der Grundlage der Ausbildung an der US Particle Accelerator School, schließt eine Lücke in der verfügbaren Literatur zum Thema Hochfrequenz-Linearbeschleuniger, kurz RF-Linac. Nach einer Erläuterung der naturwissenschaftlichen Grundlagen und der neuesten technologischen Eckdaten stellt diese zweite Auflage neueste RF-Linacs, spezialisierte Systeme, Systeme mit Supraleitern und verschiedene Spezialverfahren vor. Übungsaufgaben an den Kapitelenden erleichtern das Einprägen und das Nacharbeiten von Vorlesungen.
Author: Alexander Wu Chao
Publisher: World Scientific
ISBN: 981458326X
Category : Science
Languages : en
Pages : 320
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Book Description
As particle accelerators strive forever increasing performance, high intensity particle beams become one of the critical demands requested across the board by a majority of accelerator users (proton, electron and ion) and for most applications. Much effort has been made by our community to pursue high intensity accelerator performance on a number of fronts. Recognizing its importance, we devote this volume to Accelerators for High Intensity Beams. High intensity accelerators have become a frontier and a network for innovation. They are responsible for many scientific discoveries and technological breakthroughs that have changed our way of life, often taken for granted. A wide range of topics is covered in the fourteen articles in this volume.
Author: Alexander W. Chao
Publisher: World Scientific
ISBN: 9812835210
Category : Science
Languages : en
Pages : 338
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Book Description
Particle accelerators are a major invention of the 20th century. In the last eight decades, they have evolved enormously and have fundamentally changed the way we live, think and work. Accelerators are the most powerful microscopes for viewing the tiniest inner structure of cells, genes, molecules, atoms and their constituents such as protons, neutrons, electrons, neutrinos and quarks. This opens up a whole new world for materials science, chemistry and molecular biology. Accelerators with megawatt beam power may ultimately solve a critical problem faced by our society, namely, the treatment of nuclear waste and the supply of an alternative type of energy. There are also tens of thousands of small accelerators all over the world. They are used every day for medical imaging, cancer therapy, radioisotope production, high-density chip-making, mass spectrometry, cargo x-ray/gamma-ray imaging, detection of explosives and illicit drugs, and weapons. This volume provides a comprehensive review of this driving and fascinating field
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Category :
Languages : en
Pages : 5
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Book Description
The Spallation Neutron Source (SNS) project is designed to reach an average beam power above 1.4 MW for pulsed neutron production [1,2]. The accelerator system operates at a repetition rate of 60 Hz and average current of 1.4 mA. It consists of an H− 1 GeV superconducting linac; a high energy beam transport(HEBT)[3] for diagnostics, transverse and longitudinal, collimations, matching, energy correction and painting; and an accumulator ring compressing the 1GeV, 1 ms pulse to 650 ns for delivery onto target through a ring-target beam transport (RTBT)[4]. At such intensity and power, beam loss is critical issue mainly for two reasons: (1) to guarantee hands-on maintenance of the accelerator; and (2) to protect components of the accelerator. The injection loss and subsequent beam loss due to all injection mechanisms has to be kept manageable. There are several injection loss mechanisms. These are: (1) the linac beam missing the stripping foil, (2) H°'s emerging from the foil, which is a function of the thickness of the foil, (3) H°'s emerging from the foil, which is calculated to be negligible, and (4) circulating beam loss due to Coulomb and nuclear scattering on the foil. Loss mechanism (1) is related to the stripping foil size and this loss should be kept to less than a few percent. This beam loss along with loss due to mechanism (3) is well known and a controlled dumping of the waste beam is planned [5]. Loss mechanism (4) is directly related to the thickness of the foil and the amount of circulating beam hitting it, which is proportional to the foil size [6]. The foil size is chosen such that it provides a compromise between mechanisms (1) and (4). The thickness of the foil is determined by mechanisms (2), (4) and the foil heating problem [7]. Present plans call for a carbon foil of size of 8 mm x 4 mm and a thickness of 300 mg/cm2. The size of the stripping foil is chosen such that a distribution tail of about 2% of the incoming linac beam misses the foil. This is a compromise between this loss and the loss due to Coulomb and nuclear scattering of the stored protons. For a 400-[mu]g/cm2 thick foil, about 0.82% and for a 300-[mu]g/cm2 foil about 2% of the incoming H− ions will emerge as H°. The population of their quantum of H° states is measured to be n{sup -2.8}, where n is the principal quantum number. The H°'s that emerge from the foil are converted to protons by a thick foil placed in their path. The downstream magnets will separate those protons from the circulating protons. The septum magnet downstream is to be combined function magnet and together with the quadrupole placed downstream shapes the image of the dumped proton beam onto the 200 kW beam dump. For 1 GeV injection, the stripped electrons from the incoming H− beam have about one thousandth of the proton power and is 1 kW at 1 MW SNS, which is formidable electron power. It is essential to dump these electrons proper way to avoid electron cloud instability [16] and overheating of components.
Author: Alexander Wu Chao
Publisher: World Scientific
ISBN: 9814469785
Category : Science
Languages : en
Pages : 338
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Book Description
Particle accelerators are a major invention of the 20th century. In the last eight decades,they have evolved enormously and have fundamentally changed the way we live, think and work.Accelerators are the most powerful microscopes for viewing the tiniest inner structure of cells, genes, molecules, atoms and their constituents such as protons, neutrons, electrons, neutrinos and quarks. This opens up a whole new world for materials science, chemistry and molecular biology. Accelerators with megawatt beam power may ultimately solve a critical problem faced by our society, namely, the treatment of nuclear waste and the supply of an alternative type of energy.There are also tens of thousands of small accelerators all over the world. They are used every day for medical imaging, cancer therapy, radioisotope production, high-density chip-making, mass spectrometry, cargo x-ray/gamma-ray imaging, detection of explosives and illicit drugs, and weapons. This volume provides a comprehensive review of this driving and fascinating field.The poster (also available in 1118 x 406 mm size) which illustrates the history and development of particle accelerators from 1919 to the future can be purchased separately.
Author: Gary A. Smith
Publisher: American Inst. of Physics
ISBN: 9780735401037
Category : Science
Languages : en
Pages : 574
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Book Description
The proceedings of the 10th Beam Instrumentation Workshop contains papers discussing the design principles and engineering issues of beam diagnostic and control instrumentation for charged particle accelerators and beam transport lines. The papers, presented at the 2002 Workshop, consist of tutorials, invited talks, and contributed oral and poster presentations.
Author: Weiren Chou
Publisher: American Institute of Physics
ISBN:
Category : Science
Languages : en
Pages : 424
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Book Description
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.
Author: Stephen Myers
Publisher: Springer Nature
ISBN: 303034245X
Category : Heavy ions
Languages : en
Pages : 867
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Book Description
This third open access volume of the handbook series deals with accelerator physics, design, technology and operations, as well as with beam optics, dynamics and diagnostics. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A,B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access.
