Paper | Title | Page |
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THOCN1 | Cathodes for Photoemission Guns | 2099 |
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The last decade has seen a considerable interest in pursuit and realization of novel light sources such as Free Electron Lasers and Energy Recovery Linacs that promise to deliver unprecedented quality x-ray beams. The performance of these machines is strongly related to the brightness of the electron beam generating the x-rays. The brightness of the electron beam itself is mainly limited by the physical processes by which electrons are generated. For laser based photoemission sources this limit is ultimately related to the properties of photocathodes. In this paper an overview of the recent progress on photocathode development for photoemission electron sources is presented. | ||
THOCN2 | The High-Energy Storage Ring (HESR) | 2104 |
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The High-Energy Storage Ring (HESR) is part of the upcoming International Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt. An important feature of this new facility is the combination of powerful phase-space cooled beams and thick internal targets (e.g., pellet targets) to reach the demanding requirements of the internal target experiment PANDA in terms of beam quality and luminosity. In this paper the status of the preparatory work for the HESR at the FZ Jülich is summarized. The main activities are beam dynamics simulations and hardware developments for HESR in combination with accelerator component tests and beam dynamics experiments at the Cooler Synchrotron COSY. | ||
Slides THOCN2 [4.366 MB] | ||
THOCN3 |
Electron Linac Photo-fission Driver for the Rare Isotope Program at TRIUMF | |
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In July 2010 the Advanced Rare Isotope Laboratory became a funded project. In collaboration with its Canadian member universities TRIUMF was awarded federal and provincial government funds for the construction of a new target building, a connecting tunnel, and an electron linear accelerator in support of its expanding rare isotope program that serves nuclear structure and astrophysics studies as well as materials and medical science. TRIUMF has embarked on the design of a 300 keV thermionic gun, a 10 MeV Injector cryomodule (ICM) and two 20 MeV Accelerator cryomodules, and beam transfer lines. Both the ICM and RF-modulated e-gun are being fast tracked; the former in collaboration with the VECC in Kolkata, India. The c.w. linac is based on super-conducting radiofrequency technology at 1.3 GHz. This paper gives an overview of the facility and accelerator design progress including beam dynamics and diagnostics, cryomodules and cryogenics, high power RF, and machine layout including beam lines. | ||
Slides THOCN3 [2.681 MB] | ||
THOCN4 | High-Power Options for LANSCE | 2107 |
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Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396. The LANSCE linear accelerator at Los Alamos National Laboratory has a long history of successful beam operations at 800 kW. We have recently studied options for restoration of high-power operations including schemes for increasing the performance to multi-MW levels. In this paper we will discuss the results of this study including the present limitations of the existing accelerating structures at LANSCE, and the high-voltage and RF systems that drive them. Several plausible options will be discussed and a preferred option will be presented that will enable the first in a new generation of scientific facilities for the materials community. The emphasis of this new facility is "Matter-Radiation Interactions in Extremes" (MaRIE) which will be used to discover and design the advanced materials needed to meet 21st century national security and energy security challenges. |
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Slides THOCN4 [2.903 MB] | ||
THOCN5 | ATLAS Upgrade | 2110 |
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Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. ATLAS (Argonne Tandem Linac Accelerator System) upgrade requires several substantial developments in accelerator technologies, such as CW heavy ion RFQ and high-performance cryomodule with low-beta cavities. The upgrade project is well advanced. The physics and engineering design of the RFQ are complete and fabrication of OFE copper parts is in progress. The 3.9-meter length RFQ is composed from 5 strongly coupled segments. High-temperature furnace brazing of the segments is planned for the summer of 2011. The RFQ design includes several innovative features such as trapezoidal vane tip modulation, compact output radial matcher to form an axially symmetric beam. The upgrade project also includes development and construction of a cryomodule containing seven 72.75 MHz SC quarter wave cavities designed for the geometrical β= 0.077 and four SC solenoids. The cavity is designed to obtain an accelerating voltage higher than 2.5 MV. The prototype cavity together with high-power capacitive coupler and piezoelectric tuner has been developed, fabricated and is being tested. This paper reports innovative design features of both RFQ and SRF linac and current status of the project. |
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Slides THOCN5 [3.070 MB] | ||
THOCN6 | Flux-coupled Cyclotron Stack: Optimization for Maximum Beam Power and Minimum Losses | 2113 |
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Funding: This work was supported in part by the U.S. Department of Energy under Grant DE-FG02-06ER41405 A flux-coupled stack of isochronous cyclotrons has been proposed as a driver for Accelerator-Driven Subcritical Systems (ADSS) for thorium-cycle fission power. The issues that limit beam current and phase space brightness are evaluated, including space charge tune shift, synchro-betatron coupling, orbit separation at injection and extraction, RF propagation within the accelerator envelope, RF parasitic modes, and stability of electrostatic septum operation. A design is presented that offers good optimization of these criteria. |
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Slides THOCN6 [5.266 MB] | ||
THOCN7 | Isochronous (CW) High Intensity Non-scaling FFAG Proton Drivers | 2116 |
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Funding: Work supported in part under SBIR grant DE-FG02-08ER85222 and by Fermi Research Alliance, under contract DEAC02-07CH11359, both with the U.S. Dept. of Energy The drive for higher beam power, duty cycle, and reliable beams at reasonable cost has focused world interest on fixed field accelerators, notably FFAGs. High-intensity GeV proton drivers encounter duty cycle and space-charge limits in the synchrotron and machine size concerns in cyclotrons. A 10-20 MW proton driver is challenging, if even technically feasible, with conventional circular accelerators. Recently, the concept of isochronous orbits has been developed for nonscaling FFAGs using powerful new methodologies in FFAG accelerator design. Isochronous orbits enable the simplicity of fixed RF and, by tailoring the field profile, the FFAG can remain isochronous beyond the energy reach of cyclotrons. With isochronous orbits, the machine proposed here has the high average current advantage and duty cycle of the cyclotron in combination with the strong focusing, smaller losses that are more typical of the synchrotron. With the cyclotron as the current industrial and medical standard, a competing CW FFAG would impact facilities using medical accelerators, proton drivers for neutron production, and accelerator-driven nuclear reactors. This work reports on these new advances. |
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Slides THOCN7 [2.429 MB] | ||