engSchilcher, TVector Sum control of pulsed accelerating fields in Lorentz Force Detuned Superconducting CavitiesEngineeringTESLA-98-20DESY1998http://cds.cern.ch/record/380230http://cds.cern.ch/record/380230oai:cds.cern.ch:380230Presented on Aug 1998 engTückmantel, JoachimControl Instabilities in a Pulsed Multi-Cavity RF System with Vector Sum Feedback (A Mathematical Analysis)Accelerators and Storage RingsSL-Note-2001-023-HRFUpcoming projects relying on pulsed linear accelerators intend to use superconducting RF systems. Cost reasons suggest driving several cavities by a common transmitter, controlled over a vector sum feedback system, possibly supported by a feed forward system. Numerical simulations hint that such a system may become uncontrollable under certain conditions. In the present paper, for a model very close to reality, we will present a mathematical proof that in fact spontaneous symmetry braking is possible for these configurations, defining also the precise conditions under which it will take place. These can be used as an estimate for the real RF system stability limits. The listing of a small program demonstrating the mechanism numerically for two cavities is attached.2001-06-25http://cds.cern.ch/record/702659http://cds.cern.ch/record/702659oai:cds.cern.ch:702659 engBoussard, DanielCiapala, EdmondPhase loop on vector sum signalAccelerators and Storage RingsCERN-SL-Note-98-051-RF1998-08-14http://cds.cern.ch/record/702471http://cds.cern.ch/record/702471oai:cds.cern.ch:702471 engTückmantel, JoachimControl Instabilities in a Pulsed Multi-Cavity RF System with Vector Sum Feedback (A Mathematical Analysis) 052Accelerators and Storage RingsCERN-OPEN-2001-052CERN-NEUTRINO-FACTORY-Note-82CERN-NUFACT-Note-82SL-Note-2001-023-HRFUpcoming projects relying on pulsed linear accelerators intend to use superconducting RF systems. Cost reasons suggest driving several cavities by a common transmitter, controlled over a vector sum feedback system, possibly supported by a feed forward system. Numerical simulations hint that such a system may become uncontrollable under certain conditions. In the present paper, for a model very close to reality, we will present a mathematical proof that in fact spontaneous symmetry braking is possible for these configurations, defining also the precise conditions under which it will take place. These can be used as an estimate for the real RF system stability limits. The listing of a small program demonstrating the mechanism numerically for two cavities is attached.2001-05-31http://cds.cern.ch/record/508767http://cds.cern.ch/record/508767oai:cds.cern.ch:508767 eng Borghes, R Presacco, R Galimberti, A Design Experience in Developing Control and Data Acquisition Systems Based on The PXI and CPXI Buses for Beam Diagnostics Accelerators and Storage Rings 2003 http://cds.cern.ch/record/681621 Controlling Accelerator Subsystems and Experiments http://cds.cern.ch/record/681621 engGalimberti, AAppolonio, MPresacco, RA Control And Data Acquisition System Based On The PXI Bus For The New Photon Beam Position Monitor PrototypeAccelerators and Storage Rings1999http://cds.cern.ch/record/532648http://cds.cern.ch/record/532648oai:cds.cern.ch:532648 2004-03-12T00:48:06Z http://cds.cern.ch/record/723515 http://cds.cern.ch/record/723515 2000-09-21T22:00:00Z http://cds.cern.ch/record/463088 http://cds.cern.ch/record/463088 engSalikova, T VKondakov, A AKurkin, G YaTribendis, A GRF Control System of FEL is Based on EPICSXXBUDKER-INP-2002-312002http://cds.cern.ch/record/607580http://cds.cern.ch/record/607580oai:cds.cern.ch:607580 engTückmantel, JoachimProposal for Control of a Multi-Cavity RF System with One TransmitterAccelerators and Storage RingsAB-Note-2003-055-SPL2003-08-05http://cds.cern.ch/record/702787http://cds.cern.ch/record/702787oai:cds.cern.ch:702787 engBurghardt, ASimrock, S NFPGA based RF controlAccelerators and Storage RingsDESY-TESLA-2003-16TESLA-2003-16TESLA-REPORT-2003-162003http://cds.cern.ch/record/609192http://cds.cern.ch/record/609192oai:cds.cern.ch:609192 eng Fong, K Laverty, M Fang, S RF Control System for ISAC II Superconducting Cavity Test Stand Accelerators and Storage Rings 2002 http://cds.cern.ch/record/729097 http://cds.cern.ch/record/729097 POSTER eng Luong, M Desmons, M Devanz, G Mosnier, A Minimizing RF Power Requirement and Improving Amplitude/Phase Control for High Gradient Superconducting Cavities Accelerators and Storage Rings 2002 http://cds.cern.ch/record/584784 http://cds.cern.ch/record/584784 eng Martins, M N Figueredo, M Malafronte, A A Takahashi, J High-power RF Phase and Amplitude Control Accelerators and Storage Rings 2002 http://cds.cern.ch/record/584756 http://cds.cern.ch/record/584756 engWang, Y MKwon, S IRegan, A HAnalysis and Synthesis of the SNS Superconducting RF Control SystemOther Fields of Physicsphysics/0008163The RF system for the SNS superconducting linac consists of a superconducting cavity, a klystron, and a low-level RF (LLRF) control system. For a proton linac like SNS, the field in each individual cavity needs to be controlled to meet the overall system requirements. The purpose of the LLRF control system is to maintain the RF cavity field to a desired magnitude and phase by controlling the klystron driver signal. The Lorentz force detuning causes the shift of the resonant frequency during the normal operation in the order of a few hundreds hertz. In order to compensate the Lorentz force detuning effects, the cavity is pre-tuned into the middle of the expected frequency shift caused by the Lorentz force detuning. Meanwhile, to reduce the overshoot in the transient response, a feed-forward algorithm, a linear parameter varying gain scheduling (LPV-GS) controller, is proposed to get away a repetitive noised caused by the pulsed operation as well as the Lorentz force detuning effects.2000http://cds.cern.ch/record/453409http://cds.cern.ch/record/453409oai:cds.cern.ch:453409 engCorredoura, P LAdolphsen, C ERF Control System for the NLC LinacsOther Fields of Physicsphysics/0008098SLAC-PUB-8571The proposed Next Linear Collider contains a large number of linac RF systems with new requirements for wideband klystron modulation and accurate RF vector detection. The system will be capable of automatically phasing each klystron and compensating for beam loading effects. Accelerator structure alignment is determined by detection of the beam induced dipole modes with a receiver similar to that used for measuring the accelerator RF and is incorporated into the RF system topology. This paper describes the proposed system design, signal processing techniques and includes preliminary test results.2000-08-16http://cds.cern.ch/record/453168http://cds.cern.ch/record/453168oai:cds.cern.ch:453168