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high gradient conducting

  • Thermal conductivity - Wikipedia

    Thermal conductivity - Wikipedia

    Thermal conduction is defined as the transport of energy due to random molecular motion across a temperature gradient. It is distinguished from energy transport by convection and molecular work in that it does not involve macroscopic flows or work-performing internal stresses.

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  • Avoiding vacuum arcs in high gradient normal conducting RF .

    Avoiding vacuum arcs in high gradient normal conducting RF .

    In order to build the Compact LInear Collider (CLIC), accelerating structures reaching extremely high accelerating gradients are needed. Such structures have been built and tested using normal-conducting copper, powered by X-band RF power and reaching gradients of 100 MV/m and above.

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  • CABOTO, a high-gradient linac for hadrontherapy | Journal .

    CABOTO, a high-gradient linac for hadrontherapy | Journal .

    Jul 01, 2013 · CABOTO, a high-gradient linac for hadrontherapy. CABOTO is a normal-conducting, high-frequency, fast-cycling linac for hadrontherapy. The present CABOTO design will receive a 12 C 6+ beam previously accelerated in a cyclotron and will boost its particle energy from 150 up to 410 MeV/u. The carbon ions of 410 MeV/u reach a depth ∼287 mm in water, necessary to treat deep-seated .

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  • HIGH-GRADIENT TEST RESULTS ON A QUADRANT-TYPE X .

    HIGH-GRADIENT TEST RESULTS ON A QUADRANT-TYPE X .

    HIGH-GRADIENT TEST RESULTS ON A QUADRANT-TYPE X-BAND SINGLE-CELL STRUCTURE Tetsuo Abe, Toshikazu Takatomi, Toshiyasu Higo, Shuji Matsumoto, and Yoshio Arakida High Energy Accelerator Research Organization (KEK), Tsukuba, Japan Abstract A common normal-conducting high-gradient accelerat-ing structure of particle accelerators is the "disk type",

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  • Application of Super Conducting High Gradient Magnetic .

    Application of Super Conducting High Gradient Magnetic .

    Therefore, high-gradient magnetic separation can not only increase economic returns but also protect ecological environment. With the maturity of super-conduction high gradient magnetic separation technology, super-conducting high gradient magnetic separation will .

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  • High-gradient X-band RF technology for CLIC and beyond

    High-gradient X-band RF technology for CLIC and beyond

    High-gradient X-Band RF technology for CLIC P. Burrows, W. Wuensch and T. Argyropoulos 3 1.2 High-gradient testing infrastructure and test results In order to test prototype accelerating structures in sufficient numbers, at high gradient, at low BDR and for long periods of time, three X-band, klystron-based test stands have been constructed at .

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  • Advances in high gradient normal conducting accelerator .

    Advances in high gradient normal conducting accelerator .

    @article{osti_1427389, title = {Advances in high gradient normal conducting accelerator structures}, author = {Simakov, Evgenya Ivanovna and Dolgashev, Valery A. and Tantawi, Sami G.}, abstractNote = {Here, this paper reviews the current state-of-the-art in understanding the phenomena of ultra-high vacuum radio-frequency (rf) breakdown in accelerating structures and the efforts to improve .

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  • Advances in high gradient normal conducting accelerator .

    Advances in high gradient normal conducting accelerator .

    In cryogenically cooled normal conducting accelerating structures the gradients of above 250 MV/m seem feasible. It is believed that the next stage of development of high gradient normal conducting accelerators must also address the efficient production and utilization of rf power for linear accelerators.

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  • Tunable high-gradient permanent magnet quadrupoles

    Tunable high-gradient permanent magnet quadrupoles

    a high gradient could only be achieved at the expense of field quality. There is also the problem that errors in the magnetisation strength or direction of the PMs give rise to a reduction in the field quality. A third design concept uses fixed poles, with the magnetic flux driven by PMs that can be moved up and down to control the gradient.

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  • [1511.05595] High-gradient High-charge CW Superconducting .

    [1511.05595] High-gradient High-charge CW Superconducting .

    Abstract: High-gradient CW photo-injectors operating at high accelerating gradients promise to revolutionize many sciences and applications. They can establish the basis for super-bright monochromatic X-ray free-electron lasers, super-bright hadron beams, nuclear- waste transmutation or a new generation of microchip production.

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  • Process parametric study for the recovery of very-fine .

    Process parametric study for the recovery of very-fine .

    This paper discusses the application of super-conducting high gradient magnetic separator (SC-HGMS) in recovering very-fine size weakly magnetic uranium bearing particles present in flotation tailings of an Indian copper ore. The U 3 O 8 content of the tailings is 0.009% and considerable distribution of uranium values is present in <10 μm size .

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  • High-gradient High-charge CW Superconducting RF gun .

    High-gradient High-charge CW Superconducting RF gun .

    on our operation of a superconducting RF electron gun with a record-high accelerating gradient at the CsK 2Sb photocathode (i.e. ~ 20 MV/m) generating a record-high bunch charge (i.e., 3 nC). We briefly describe the system and then detail our experimental results. This achievement opens new era in generating high-power electron beams with a

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  • Status of High Gradient Tests of Normal Conducting Single .

    Status of High Gradient Tests of Normal Conducting Single .

    Status of High Gradient Tests of Normal Conducting Single-Cell Structures Valery Dolgashev, Sami Tantawi (SLAC) Yasuo Higashi (KEK) Robert Siemann Symposium and ICFA Mini-Workshop, July 7th - 10th, 2009 SLAC National Accelerator Laboratory

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  • High Gradient Normal Conducting Radio-Frequency .

    High Gradient Normal Conducting Radio-Frequency .

    HIGH GRADIENT NORMAL CONDUCTING RADIO-FREQUENCY PHOTOINJECTOR SYSTEM FOR SINCROTRONE TRIESTE L. Faillace #, R. Agustsson, P. Frigola, Radiabeam Technologies LLC .

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  • High gradient, X-band and above, metallic RF structures

    High gradient, X-band and above, metallic RF structures

    •S. Heikkinen, Study of High Power RF Induced Thermal Fatigue in the High Gradient Accelerating Structures, Ph.D. thesis, Helsinki University of Technology, Finland (2008). • Hard copper allows resistant to pulse heating damage • Clad materials • Cryo-experiments with normal conducting structures

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  • Salient Features of Inertial Stretching of a High‐Gradient .

    Salient Features of Inertial Stretching of a High‐Gradient .

    From the viewpoint of the model of a uniformly stretching cylindrical incompressible rigid‐plastic conducting rod, the salient features of deformation of metal cumulative jets in a longitudinal low‐frequency magnetic field are considered. The electromagnetic processes proceeding in the jet segments when they enter or leave the region with a magnetic field have been investigated.

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  • Optimizing the Performance of Flat-surface, High-gradient .

    Optimizing the Performance of Flat-surface, High-gradient .

    High-gradient insulators HGI are periodic assemblies of conducting and insulat()- ing layers that have been shown to withstand higher pulsed voltages in vacuum than homogeneous insulators of .

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  • New Criterion for Shape Optimization of Normal-Conducting .

    New Criterion for Shape Optimization of Normal-Conducting .

    When optimizing the shape of high-gradient accelerating cells, the goal has traditionally been to minimize the peak surface electric field / gradient, or more recently minimizing the peak modified Poynting vector / gradient squared. This paper

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  • High-gradient low-β accelerating structure using the first .

    High-gradient low-β accelerating structure using the first .

    The development of high-gradient accelerating structures for low-β particles is the key for compact hadron linear accelerators. A particular example of such a machine is a hadron therapy linac, which is a promising alternative to cyclic machines, traditionally used for cancer treatment. Currently, the practical utilization of linear accelerators in radiation therapy is limited by the .

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  • APS -APS April Meeting 2020 - Event - Progress in the .

    APS -APS April Meeting 2020 - Event - Progress in the .

    To limit the size and cost of these sources, high accelerating gradient is required. Vacuum breakdown limits the achievable gradient in normal conducting accelerators, but using THz-frequency structures could allow for compact, GV/m-scale devices. We are developing a THz-driven field-emission electron gun to generate relativistic electrons in .

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  • High-Gradient issues in S-band RF Acceleration Structure .

    High-Gradient issues in S-band RF Acceleration Structure .

    The achievement of high-gradient in the linac structures is a key issue in design facility for high energy physics and other applications. This thesis is focused on the study of the high-gradient limitations in the normal-conducting radio-frequency accelerating structures. One of the effects that could appear during high power operation of the accelerating structures is the RF vacuum arcs or .

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  • Application Of Superconducting High Gradient Magnetic .

    Application Of Superconducting High Gradient Magnetic .

    The concentrate can be utilized as low-grade normal SiO 2 sands for industrial use, or act as the raw materials for preparing high-purity SiO 2 product. Keywords: Iron ore beneficiation tailidddngs, magnetic flux density, pulp concentration, super conducting high gradient magnetic separation, .

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  • Normal-conducting high-gradient rf systems Part 2

    Normal-conducting high-gradient rf systems Part 2

    Normal-conducting high-gradient rf systems Part 2. CAS on Future Colliders, 4 and 5 March 2018 Walter Wuensch, CERN Lecture structure 1. Basic concepts of travelling wave accelerating structures 2. High peak rf power production and manipulation 3. High field phenomena in accelerating structures.

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  • Avoiding vacuum arcs in high gradient normal conducting RF .

    Avoiding vacuum arcs in high gradient normal conducting RF .

    In order to build the Compact LInear Collider (CLIC), accelerating structures reaching extremely high accelerating gradients are needed. Such structures have been built and tested using normal-conducting copper, powered by X-band RF power and reaching gradients of 100 MV/m and above.

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  • Thermal conduction - Wikipedia

    Thermal conduction - Wikipedia

    Thermal conduction is the transfer of internal energy by microscopic collisions of particles and movement of electrons within a body. The colliding particles, which include molecules, atoms and electrons, transfer disorganized microscopic kinetic and potential energy, jointly known as internal energy.

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  • Commissioning, first tests and upgrade of a high . - CORDIS

    Commissioning, first tests and upgrade of a high . - CORDIS

    The High-Gradient (HG) know-how and technology for normal-conducting accelerating RF (Radio-Frequency) electron linac (linear accelerator) structures recently developed for projects such as CLIC (CERN), has raised the achievable accelerating gradient from 20-30 MV/m up to 100-120 MV/m.

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  • Review of Models of RF Surface Resistance in High Gradient .

    Review of Models of RF Surface Resistance in High Gradient .

    Review of RF surface resistance contributions in high gradient RF cavities made from Nb 12/18/2004 3 TD-04-014-NbRFSurfResReview_rev1_bu.doc 1) Introduction The surface impedance, Z s, of any good conductor can be derived using the normal skin effect theory. An expression for the surface resistance, R s, and the surface reactance, X

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  • The Science of Heat Transfer: What Is Conduction .

    The Science of Heat Transfer: What Is Conduction .

    Dec 08, 2014 · The process of heat conduction depends on four basic factors: the temperature gradient, the cross section of the materials involved, their .

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  • A high gradient test of a single-cell superconducting .

    A high gradient test of a single-cell superconducting .

    Normal conducting traveling wave structure was proposed by Shersby-Harvie and Mullett, . Successful high gradient tests of the single-cell model of STWA structure opens the way to take the next step in traveling wave SC cavity development: to build and test a three-cell SC traveling wave cavity with a feedback waveguide. .

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  • Development of a superconducting cavity for high gradient .

    Development of a superconducting cavity for high gradient .

    A collaboration between KEK and CEBAF is pursuing the development of a superconducting high gradient accelerating structure for application in future accelerator which optimally requires the high field gradient above 25 MV/m. In the first phase of this collaboration three single cell 1300 MHz niobium cavities have been built and tested.

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