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| MPPP012 | First-Principles Simulation and Comparison with Beam Tests for Transverse Instabilities and Damper Performance in the Fermilab Main Injector | 1300 |
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| An end-to-end performance calculation and comparison with beam tests was performed for the bunch-by-bunch digital transverse damper in the Fermilab Main Injector. Time dependent magnetic wakefields responsible for "Resistive Wall" transverse instabilities in the Main Injector were calculated with OPERA-2D using the actual beam pipe and dipole magnet lamination geometry. The leading order dipole component was parameterized and used as input to a bunch-by-bunch simulation which included the filling pattern and injection errors experienced in high-intensity operation of the Main Injector. The instability growth times, and the spreading of the disturbance due to newly mis-injected batches was compared between simulations and beam data collected by the damper system. Further simulation models the effects of the damper system on the beam. | ||
| MPPP015 | Operational Performance of a Bunch by Bunch Digital Damper in the Fermilab Main Injector | 1440 |
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| We have implemented a transverse and longitudinal bunch by bunch digital damper system in the Fermilab Main Injector, using a single digital board for all 3 coordinates. The system has been commissioned over the last year, and is now operational in all MI cycles, damping beam bunched at both 53MHz and 2.5MHz. We describe the performance of this system both for collider operations and high-intensity running for the NuMI project. | ||
| MOPB001 | An 8 GeV Superconducting Injector Linac | |
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Funding: U.S. Department of Energy, Office of Science. The Fermilab Proton Driver is an 8 GeV Superconducting H- injector linac which replaces both the Fermilab 8 GeV Booster Synchrotron and its injector linac. In addition to its primary mission of enabling 2 MW beam power at 120 GeV for the Fermilab Main Injector neutrino program, it also provides stand alone beam power of 0.5-2 MW at 8 GeV for a variety of physics goals. The main linac from 1.3-8 GeV uses 1300 MHz TESLA klystrons and cryomodules, and thus represents a ~1.5% system test of the Linear Collider. The front end linac uses a combination of 1300 MHz beta<1 eliptical cavities and 325 MHz spoke resonators. By extending the TESLA technique of driving many superconducting cavities from a single large klystron, the 8 GeV linac requires only 11 klystrons. This has required the development of fast, high power YIG-ferrite phase shifters to provide individual RF phase and amplitude control at each cavity. Using this technique, the linac up to 100 MeV is powered by a single JPARC/Toshiba 325 MHz 2.5 MW Klystron. Proton Driver project status will be discussed in light of recent program developments at Fermilab. http://protondriver.fnal.gov. |
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| WPAT050 | High Power Phase Shifter | 3123 |
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| One of the approaches to power distribution system of a superconducting proton linac that is under discussion at Fermilab requires development of a fast-action, megawatt-range phase shifter. Using two phase shifters with a waveguide hybrid junction can allow independent control of phase and amplitude of RF power at the input of each superconducting cavity of the linac. This promises significant saving in number of klystrons and modulators required for the accelerator. A prototype of a waveguide version of a phase shifter that uses Yttrium-Iron Garnet (YIG) blocks was developed and tested. This report presents design concept of the device and main results of simulation and proof-of-principle tests. | ||
| FPAE054 | Front End Design of a Multi-GeV H-minus Linac | 3286 |
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Funding: This work was supported by the U.S. Department of Energy under Contracts No. W-31-109-ENG-38 and DE-AC02-76CH03000. The proposed 8-GeV driver at FNAL is based on ~480 independently phased SC resonators. Significant cost saving is expected by using an rf power fan out from high-power klystrons to multiple cavities. Successful development of superconducting (SC) multi-spoke resonators operating at ~345-350 MHz provides a strong basis for their application in the front end of multi-GeV linear accelerators. Such a front-end operating at 325 MHz would enable direct transition to high-gradient 1300 MHz SC TESLA-style cavities at ~400 MeV. The proposed front end consists of 5 sections: a conventional RFQ, room-temperature (RT) cross-bar H-type (CH) cavities, single-, double- and triple-spoke superconducting resonators. For several reasons which are discussed in this paper there is a large advantage in using independently phased RT CH-cavities between the RFQ and SC sections in the energy range 3-15 MeV. |