| Paper |
Title |
Page |
| TUP009 |
First Operation of the FLASH Machine Protection System with Long Bunch Trains
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262 |
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- L. Fröhlich, L. Fröhlich
Uni HH, Hamburg
- M. Görler, P. Göttlicher, D. Noelle, D. Pugachov, H. Schlarb, S. Schreiber, M. Staack, M. Werner
DESY, Hamburg
- A. Hamdi, M. Luong, J. Novo
CEA, Gif-sur-Yvette
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The linac-based free electron laser facility FLASH at DESY Hamburg is designed to transport an electron beam with an average power of more than 50 kW. To avoid serious damage to accelerator components, a fast active machine protection system (MPS) stops the production of new bunches if hazardous machine conditions are detected. This paper gives an overview of the MPS topology and its subsystems. Furthermore, we present results from the commissioning of the fast beam interlock system that has for the first time allowed to operate the accelerator with macropulses of up to 600 bunches.
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| THP016 |
Active Compensation of Lorentz Force Detuning of a TTF 9-Cell Cavity in CRYHOLAB
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598 |
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- G. Devanz, P. Bosland, M. Desmons, E. Jacques, M. Luong, B. Visentin
CEA, Gif-sur-Yvette
- M. Fouaidy
IPN, Orsay
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Linear colliders and free-electron lasers projects based on the superconducting RF technology require high gradient pulsed operation of superconducting elliptical multicells. The cavities are subject to Lorentz force detuning which reflects on an increased RF power consumption when trying to stabilize the accelerating field during the beam passage. This pulsed detuning can be mechanically compensated using a fast piezoelectric tuner. A new tuner with integrated piezoelectric actuators has been developed in the framework of CARE/SRF european program. The tuning system has been tested on a fully equipped 9-cell TTF cavity in the CRYHOLAB horizontal cryostat using the pulsed 1.3 GHz 1 MW RF source. In virtue of the high pulse to pulse repeatability of the detuning, the compensation of Lorentz detuning was achieved successfully using a simple feed forward scheme.
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| THP039 |
Status of the RF Systems for the SPIRAL2 Linac at the Beginning of the Construction Phase
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664 |
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- M. Di Giacomo, B. Ducoudret, M. Tripon
GANIL, Caen
- P. De Antoni, P. Galdemard, M. Luong, O. Piquet
CEA, Gif-sur-Yvette
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The Spiral 2 project uses an RFQ and a superconductiong linac to accelerate high intensity beams of deuterons and heavier ions. The accelatoror frequency is 88 MHz. The construction phase was approved in Mai 2005 and the project organization was recently finalized. The RF Systems activity includes power amplifiers and control electronics for all the accelerator and some of the RF devices on the beam line: the slow and fast chopper and the rebunchers. The paper describes the status of the amplifiers prototypes, the architecture chosen for the digital LLRF and the preliminary studies on the other RF devices.
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