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| TUOBKI02 |
Low Emittance Muon Colliders
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emittance, collider, simulation, factory |
706 |
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- R. P. Johnson
- Y. S. Derbenev
Jefferson Lab, Newport News, Virginia
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Funding: The work described here was supported in part by DOE SBIR/STTR grants DE-FG02-03ER83722, 04ER86191, 04ER84016, 05ER86252, 05ER86253 and 06ER86282.
Advances in ionization cooling, phase space manipulations, and technologies to achieve high brightness muon beams are stimulating designs of high-luminosity energy-frontier muon colliders. Simulations of Helical Cooling Channels (HCC) show impressive emittance reductions, new ideas on reverse emittance exchange and muon bunch coalescing are being developed, and high-field superconductors show great promise to improve the effectiveness of ionization cooling. Experiments to study RF cavities pressurized with hydrogen gas in strong magnetic fields have had encouraging results. A 6-dimensional HCC demonstration experiment is being designed and a 1.5 TeV muon collider is being studied at Fermilab. Two new synergies are that very cool muon beams can be accelerated in ILC RF structures and that this capability can be used both for muon colliders and for neutrino factories. These advances are discussed in the context of muon colliders with small transverse emittances and with fewer muons to ease requirements on site boundary radiation, detector backgrounds, and muon production.
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Slides
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| WEPMN034 |
Classification of Eigenmodes in a Side-Coupled Structure According to the Space Group Representations
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proton, coupling, hadron |
2116 |
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- S. Sakanaka
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The geometric symmetry of an rf structure can be expressed by a group of symmetry operations that keep the configuration unchanged*. In case of a periodic rf structure, the symmetry group is a space group containing translations as well as the other symmetry operations. The eigenmodes in the structure can be classified according to the irreducible representations of the space group of the structure. In this paper, this procedure is described with an example of the side-coupled structure (SCS)**. Since the SCS is symmetric under a screw (rotation followed by a non-primitive translation) and a glide operations, it provides a good example of non-symmorphic space group, that is, the group contains an essential screw or glide operations.
* S. Sakanaka, Phys. Rev. ST Accel. Beams 8, 072002 (2005).** E. A. Knapp, B. C. Knapp, and J. M. Potter, Rev. Sci. Instrum. 39, 979 (1968).
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| WEPMN093 |
Multipactor Simulations in Superconducting Cavities
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simulation, electron, linac, radio-frequency |
2248 |
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- I. G. Gonin
- J. F. DeFord, B. Held
STAR, Inc., Mequon, Wisconsin
- N. Solyak
Fermilab, Batavia, Illinois
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The multipactor (MP) is a well-known phenomenon. The existence of resonant trajectories can lead to electron avalanche under certain field level and surface conditions. In this paper we describe features of the extension of Analyst software - PT3P code developed for MP simulations in a real 3D RF structures, such as cavities, couplers, RF windows etc. Also we present the results of MP simulations in HOM couplers of TESLA, SNS β=0.61 and β=0.81 and FNAL 3-rd harmonic cavities. We discuss the comparison of simulations with experimental results.
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| THIAKI05 |
European Industries Potential Capabilities on Superconducting RF Accelerator Modules
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superconducting-RF, linac, synchrotron, vacuum |
2680 |
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- H. Vogel
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European Industry has been supporting accelerator projects in the past and will be supporting future projects. Larger numbers of superconducting accelerator modules with guaranteed performance parameters have been supplied for example for LEP at CERN and superconducting cavities have been supplied also with guarantees for CEBAF at Jefferson Lab, the proton linear accelerator for the Spallation Neutron Source, Oak Ridge, and for the rf system for LHC. A significant number of cavities have been supplied in support of the TTF/ILC activities. With a view to the future European X-FEL linear accelerator it is expected that turn-key accelerator modules will be requested from industry. A review of the European Industries supplies in the past and present will be given to show their capabilities for the future ILC.
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Slides
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| THPMS076 |
Development of Dual Layered Dielectric-Loaded Accelerating Structure
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simulation, impedance, vacuum, coupling |
3160 |
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- C.-J. Jing
- A. Kanareykin
Euclid TechLabs, LLC, Solon, Ohio
- S. Kazakov
KEK, Ibaraki
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Funding: DOE SBIR Phase I, DOE Grant No. DE-FG02-05ER84356
Due to the high magnetic field-induced surface currents on its conducting sleeve, a conventional single layer Dielectric-Loaded Accelerating (DLA) structure exhibits a relatively high RF loss. One possible way to solve this problem is to use multilayered DLA structures*. In these devices, the RF power attenuation is reduced by making use of the Bragg Fiber concept: the EM fields are well confined by multiple reflections from multiple dielectric layers. This paper presents the design of an X-band dual layer DLA structure as well as the results of bench tests of the device. We will also present results on the design, numerical modeling, and fabrication of structures for coupling RF into multilayer DLAs such as a novel TM03 mode launcher and a TM01-TM03 mode converter using dielectric-loaded corrugated waveguide.
* C. Jing, W. Liu, W. Gai, J. G. Power, and T. Wong, Nucl. Instr. Meth. Phy. Res. A 539 (2005) 445-454.
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| THPAN054 |
Experiment on a Cold Test Model of a 2-Cell SC Deflecting Cavity for ALS at LBNL
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damping, simulation, coupling, electron |
3348 |
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