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Operation Of The Superconducting Linac At The Spallation Neutron Source
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Book Synopsis Operation of the Superconducting Linac at the Spallation Neutron Source by :
Download or read book Operation of the Superconducting Linac at the Spallation Neutron Source written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: At the Spallation Neutron Source, the first fully operational pulsed superconducting linac has been active for about two years. During this period, stable beam operation at 4.4 K has been achieved with beam for repetition rates up to 15 Hz and 30 Hz at 2.1 K. At the lower temperature 60 Hz RF pulses have been also used. Full beam energy has been achieved at 15 Hz and short beam pulses. Most of the time the superconducting cavities are operated at somewhat lower gradients to improve reliability. A large amount of data has been collected on the pulsed behavior of cavities and SRF modules at various repetition rates and at various temperatures. This experience will be of great value in determining future optimizations of SNS as well in guiding in the design and operation of future pulsed superconducting linacs. This paper describes the details of the cryogenic system and RF properties of the SNS superconducting linac.
Book Synopsis Construction and Operation of the Spallation Neutron Source (TN, NY, IL, NM) by :
Download or read book Construction and Operation of the Spallation Neutron Source (TN, NY, IL, NM) written by and published by . This book was released on 1999 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis SUPERCONDUCTING LINAC FOR THE SPALLATION NEUTRON SOURCE. by :
Download or read book SUPERCONDUCTING LINAC FOR THE SPALLATION NEUTRON SOURCE. written by and published by . This book was released on 2000 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Spallation Neutron Source (SNS) linac is comprised of both normal and superconducting rf (SRF) accelerating structures. The SRF linac accelerates the beam from 186 to 1250 MeV through 117 elliptical, multi-cell niobium cavities. This paper describes the SRF linac architecture, physics design considerations, cavity commissioning, and the expected beam dynamics performance.
Book Synopsis Superconducting Prototype Cavities for the Spallation Neutron Source (SNS) Project by :
Download or read book Superconducting Prototype Cavities for the Spallation Neutron Source (SNS) Project written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Spallation Neutron Source project includes a superconducting linac section in the energy range from 186 MeV to 1000 MeV. For this energy range two types of cavities are needed with geometrical [beta] values of [beta] = 0.61 and [beta] = 0.81. An aggressive cavity prototyping program is being pursued at Jefferson Lab, which calls for fabricating and testing four [beta] = 0.61 cavities and two [beta] = 0.81 cavities. Both types consist of six cells made from high purity niobium and feature one HOM coupler on each beam pipe and a port for a high power coaxial input coupler. Three of the four [beta] = 0.61 cavities will be used for a cryomodule test in early 2002. At this time four medium beta cavities and one high beta cavity have been completed at JLab. The first tests on the [beta] = 0.61 and [beta] = 0.81 exceeded the design values for gradient and Q value: E[sub acc] = 10.1 MV/m and Q = 5 x 10[sup 9] at 2.1K for the [beta] = 0.61 and E[sub acc] = 12.3 MV/m and Q = 5 x 10[sup 9] at 2.1 K for the [beta] = 0.81. One of the medium beta cavities has been equipped with an integrated helium vessel and measurements of the static Lorentz force detuning have been done and compared to the ''bare'' cavities. In addition two single cell cavities have been fabricated, equipped with welded-on HOM couplers. They are being used to evaluate the HOM couplers with respect to multipacting, fundamental mode rejection and HOM damping as far as possible in a single cell. This paper describes the cavity design with respect to electromagnetic and mechanical features, the fabrication efforts and the results obtained with the different cavities existing at the time of this workshop.
Book Synopsis Performance Overview of the Production Superconducting RF Cavities for the Spallation Neutron Source Linac by :
Download or read book Performance Overview of the Production Superconducting RF Cavities for the Spallation Neutron Source Linac written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of its efforts for the SNS construction project, Jefferson Lab has produced 23 cryomodules for the superconducting linac. These modules contained 81 industrially produced multicell Nb accelerating cavities. Each of these cavities was individually tested before assembly into a cryomodule to verify that they achieved the required performance. This ensemble of cavities represents the 3rd largest set of production superconducting cavities fabricated and tested to date. The timely qualification testing of such a collection of cavities offers both challenges and opportunities. Their performance can be characterized by achieved gradient at the required Qo, achieved peak surface field, onset of field emission, and observations of multipacting. Possible correlations between cavity performance and process parameters, only really meaningful in the framework of a large scale production effort, will also be presented. In light of the potential adoption of these cavities for projects such as the Rare Isotope Accelerator or Fermilab Proton Driver, such an analysis is crucial to their success.
Book Synopsis Design Considerations on a Proton Superconducting Linac by :
Download or read book Design Considerations on a Proton Superconducting Linac written by and published by . This book was released on 1995 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors analyze the longitudinal motion of a single proton in a superconducting linear accelerator. They derive the linearized equations of motion, and develop a matrix formalism to represent the progress of motion. The goal is to provide a tool which can be easily included in a computer code for the design of superconducting proton linacs. In particular they determine the stability conditions, and the amount of motion mismatch resulting from the presence of drift insertions, and from the rate of acceleration. Space-charge effects have not been included in the analysis. They complement the analysis with considerations of the rf and cryogenic power requirements, of the pulsed mode of operation, and of the beam transverse confinement. They conclude with an example of a Spallation Neutron Source.
Book Synopsis Superconducting Linac for the SNS. by :
Download or read book Superconducting Linac for the SNS. written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Spallation Neutron Source (SNS) linac is comprised of both normal and superconducting rf (SRF) accelerating structures. The SRF linac is accelerates the beam from 186 to 1250 MeV through 117 elliptical, multi-cell niobium cavities. This paper describes the SRF linac architecture, physics design considerations, cavity commissioning, and the expected beam dynamics performance.
Book Synopsis Design Considerations for High-current Superconducting Ion Linacs by :
Download or read book Design Considerations for High-current Superconducting Ion Linacs written by and published by . This book was released on 1993 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superconducting linacs may be a viable option for high-current applications such as fusion materials irradiation testing, spallation neutron source, transmutation of radioactive waste, tritium production, and energy production. These linacs must run reliably for many years and allow easy routine maintenance. Superconducting cavities operate efficiently with high cw gradients, properties which help to reduce operating and capital costs, respectively. However, cost-effectiveness is not the sole consideration in these applications. For example, beam impingement must be essentially eliminated to prevent unsafe radioactivation of the accelerating structures, and thus large apertures are needed through which to pass the beam. Because of their high efficiency, superconducting cavities can be designed with very large bore apertures, thereby reducing the effect of beam impingement. Key aspects of high-current cw superconducting linac designs are explored in this context.
Book Synopsis A PROCEDURE TO SET PHASE AND AMPLITUDE OF THE RF IN THE SNS LINAC'S SUPERCONDUCTING CAVITIES. by :
Download or read book A PROCEDURE TO SET PHASE AND AMPLITUDE OF THE RF IN THE SNS LINAC'S SUPERCONDUCTING CAVITIES. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes a procedure to set the phase and amplitude of the RF fields in the Spallation Neutron Source (SNS) linac's superconducting cavities. The linac uses superconducting cavities to accelerate the H[sup -] ion beam from the normal conducting linac at 185 MeV to a final energy of[approx]1 GeV. There are two types of cavities in the linac, 33 cavities with a geometric beta of 0.61 and 48 cavities with a geometric beta of 0.81. The correct phase setting of any single superconducting cavity depends on the RF phase and amplitude of all the preceding superconducting cavities. For the beam to be properly accelerated it must arrive at each cavity with a relative phase ([phi][sub s]), called the synchronous phase, of about -20 degrees. That is, it must arrive early with respect to the phase at which it would gain the maximum energy by 20 degrees. This timing provides the longitudinal focusing. Beam particles arriving slightly later gain more energy and move faster relative to the synchronous beam particle. The problem is to set the phase and amplitude of each cavity in the linac so that the synchronous particle arrives at each cavity with the correct phase. The amplitude of each superconducting cavity will be adjusted as high as possible constrained only by the available RF power and the breakdown field of the cavity.
Book Synopsis Conceptual Design for Replacement of the DTL and CCL with Superconducting RF Cavities in the Spallation Neutron Source Linac by :
Download or read book Conceptual Design for Replacement of the DTL and CCL with Superconducting RF Cavities in the Spallation Neutron Source Linac written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Spallation Neutron Source Linac utilizes normal conducting RF cavities in the low energy section from 2.5 MeV to 186 MeV. Six Drift Tube Linac (DTL) structures accelerate the beam to 87 MeV, and four Coupled Cavity Linac (CCL) structures provide further acceleration to 186 MeV. The remainder of the Linac is comprised of 81 superconducting cavities packaged in 23 cryomodules to provide final beam energy of approximately 1 GeV. The superconducting Linac has proven to be substantially more reliable than the normal conducting Linac despite the greater number of stations and the complexity associated with the cryogenic plant and distribution. A conceptual design has been initiated on a replacement of the DTL and CCL with superconducting RF cavities. The motivation, constraints, and conceptual design are presented.
Book Synopsis RF Linear Accelerators by : Thomas P. Wangler
Download or read book RF Linear Accelerators written by Thomas P. Wangler and published by John Wiley & Sons. This book was released on 2008-03-03 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis THE SNS VACUUM CONTROL SYSTEM UPGRADE FOR THE SUPERCONDUCTING LINAC. by :
Download or read book THE SNS VACUUM CONTROL SYSTEM UPGRADE FOR THE SUPERCONDUCTING LINAC. written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The superconducting linac of the Spallation Neutron Source (SNS) has 23 cryomodules whose vacuum system is monitored and controlled by custom built hardware. The original control hardware was provided by Thomas Jefferson National Accelerator Facility (JLab) and contained a variety of custom boards utilizing integrated circuits to perform logic. The need for control logic changes, a desire to increase maintainability, and a desire to increase flexibility to adapt for the future has led to a Programmable Logic Controller (PLC) based upgrade. This paper provides an overview of the commercial off-the-shelf (COTS) hardware being used in the superconducting vacuum control system. Details of the design and challenges to convert a control system during small windows of maintenance periods without disrupting beam operation will be covered in this paper.
Book Synopsis RF Superconductivity by : Hasan Padamsee
Download or read book RF Superconductivity written by Hasan Padamsee and published by John Wiley & Sons. This book was released on 2009-04-20 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the second book to RF Superconducting, written by one of the leading experts. The book provides fast and up-to-date access to the latest advances in the key technology for future accelerators. Experts as well as newcomers to the field will benefit from the discussion of progress in the basic science, technology as well as recent and forthcoming applications. Researchers in accelerator physics will also find much that is relevant to their discipline.
Book Synopsis Applied Superconductivity by : Paul Seidel
Download or read book Applied Superconductivity written by Paul Seidel and published by John Wiley & Sons. This book was released on 2015-03-23 with total page 1334 pages. Available in PDF, EPUB and Kindle. Book excerpt: This wide-ranging presentation of applied superconductivity, from fundamentals and materials right up to the details of many applications, is an essential reference for physicists and engineers in academic research as well as in industry. Readers looking for a comprehensive overview on basic effects related to superconductivity and superconducting materials will expand their knowledge and understanding of both low and high Tc superconductors with respect to their application. Technology, preparation and characterization are covered for bulk, single crystals, thins fi lms as well as electronic devices, wires and tapes. The main benefit of this work lies in its broad coverage of significant applications in magnets, power engineering, electronics, sensors and quantum metrology. The reader will find information on superconducting magnets for diverse applications like particle physics, fusion research, medicine, and biomagnetism as well as materials processing. SQUIDs and their usage in medicine or geophysics are thoroughly covered, as are superconducting radiation and particle detectors, aspects on superconductor digital electronics, leading readers to quantum computing and new devices.
Book Synopsis Proceedings of the XVIII International Linear Accelerator Conference by : C. Hill
Download or read book Proceedings of the XVIII International Linear Accelerator Conference written by C. Hill and published by . This book was released on 1996 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Savannah River Accelerator Project And Complementary Spallation Neutron Sources by : Frank T Avignone Iii
Download or read book The Savannah River Accelerator Project And Complementary Spallation Neutron Sources written by Frank T Avignone Iii and published by World Scientific. This book was released on 1998-02-24 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume is a collection of papers dealing with the applications of spallation neutron sources to pure science, applied science and defense programs. The topics, ranging from accelerator technology to applications in materials science and neutrino physics, are covered by experts in their respective fields.
Book Synopsis Cavity Misalignment and Off-Axis Field Effects on Transverse Beam Dynamic in Spallation Neutron Source Superconducting Linac by :
Download or read book Cavity Misalignment and Off-Axis Field Effects on Transverse Beam Dynamic in Spallation Neutron Source Superconducting Linac written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: For highly relativistic beams, transverse motion due to off-axis fields is not a concern because the transverse RF magnetic and electric forces for off-axis particles cancel each other. Since The Spallation Neutron Source (SNS) will accelerate moderately relativistic H- particle beam, transverse motion due to off-axis fields has to be checked. Misaligned cavities have physically the same transverse effect on particles moving on axis as off-axis particles passing through perfectly aligned cavities. The main purpose of this paper is to calculate the impact on the transverse motion of the beam from the superconducting cavity (SC) misalignment in SNS. Quadrupole misalignment is then added to obtain a more general statement for the transverse behavior of the beam under alignment errors. For this issue, we use on-axis and off-axis electromagnetic field data from Superfish to calculate beam properties of the SNS beam all along the SC linac with misaligned cavities.
