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| THPPGM01 |
A Control and Systems Theory Approach to the High Gradient Cavity Detuning Compensation
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2952 |
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- R. Paparella
INFN/LASA, Segrate (MI)
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The compensation of dynamic detuning is of primary importance in order to operate TESLA type cavities at the high accelerating gradient foreseen for the ILC (31.5 MV/m). This article firstly resumes recent successful experiences of open loop compensation of the Lorentz force detuning, repetitive and synchronous to the RF pulse, using fast piezoelectric actuators with different fast tuning systems. Possible strategies and results for the closed loop compensation of the stochastic microphonic detuning are also presented. Lastly, a deep characterization of the system under control is given, exploiting the system transfer functions acquired through both installed piezo actuators/sensors and phase locked measurements. This ultimately allows the analytical modeling of the behavior of cavity detuning and of its active compensation with piezoelectric actuators.
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Slides
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| THPPGM02 |
EPS-AG 2008 Frank Sacherer Prize Presentation: First Steps Toward Laser Stripping Implementation
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2955 |
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- V. V. Danilov
ORNL, Oak Ridge, Tennessee
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Thin carbon foils are used as strippers for charge exchange injection into high intensity proton rings. However, the stripping foils become radioactive and produce uncontrolled beam loss, which is one of the main factors limiting beam power in high intensity proton rings. Recently, the first laser-assisted high efficiency conversion of H- beam into protons was successfully demonstrated for a short laser pulse at Spallation Neutron Source project in Oak Ridge, Tennessee. The next step will be to build stripping device to make 1-10 μsec pulses stripping. The associated problems and possible solutions for projects with large ranges of H- beam energies are described.
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Slides
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| THPPGM03 |
EPS-AG 2008 Gersh Budker Prize Presentation: The Successful Construction and Commissioning of the Spallation Neutron Source
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2960 |
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- N. R. Holtkamp
ITER, St Paul lez Durance
- N. R. Holtkamp
ORNL, Oak Ridge, Tennessee
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The Spallation Neutron Source collaboration between six Department of Energy laboratories was a unique arrangement in its mission to build a large science facility, with equally distributed responsibility for design, construction, project management and budget. The Oak Ridge National Laboratory, with no previous experience in large accelerator construction, was selected as the project site, the team was recruited worldwide, and the management team was exchanged several times during the construction period. The constraints of such a collaboration, a new team having to work together on a complex project, facing demanding scientific and technical challenges, is a cocktail that can easily lead to failure, but also to success, as proven. Was it luck or good management that decided the fate of the project? Can the weakness of such a situation simultaneously become its strength? In hindsight, it is interesting to reflect on how it was done and what became of some of the key players. Certainly this experience in many ways provided the author with a key to face a much larger challenge, namely the management of an international science project shared between seven Countries, called ITER. A project that takes the concepts tried at SNS to another extreme. Comparisons will be provided and some of the unique features will be discussed.
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Slides
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| THPPGM04 |
SLIM - An Early Work Revisited
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2963 |
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- A. Chao
SLAC, Menlo Park, California
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An early, but at the time illuminating, piece of work on how to deal with a general, linearly coupled accelerator lattice is revisited. This work is based on the SLIM formalism developed in 1979-1981.
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Slides
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