| Paper |
Title |
Page |
| MOPD033 |
The ALBA RF Amplifier System Based on Inductive Output Tubes (IOT)
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523 |
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- P. Sanchez, D. Einfeld, M. L. Langlois, F. Pérez
ALBA, Bellaterra
- J. Alex, A. Spichiger, J. Stahl
Thomson Broadcast & Multimedia AG, Turgi
- C. Bel, G. Peillex-Delphe, P. Ponard
TED, Thonon
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The ALBA accelerator RF systems include a complete new transmitter developed in collaboration between Thomson Broadcast & Multimedia (TBM), Thales Electron Devices (TED) and CELLS. A new IOT version, based on the previous TH793 has been developed by TED: the TH793-1, dedicated to scientific applications. It has demonstrated cw operation up to 90 kW at 500 MHz. In addition, a TH18973 LS cavity has also been developed, featuring a 6”1/8 coaxial RF output, an optimized cooling system and centred operation at 500 MHz, 7 MHz bandwidth and ± 5 MHz tuning range. TBM developed a new amplifier system to achieve high reliability and performance. Each IOT is powered by an individual power supply based on the Pulse Step Modulator technology. The amplifier control system was designed on a PLC controller with the possibility to interface with the Tango control system. The first amplifier was delivered to ALBA in summer 2007 and is already in use for the conditioning and testing of the first RF cavity. The remaining 13 amplifiers will be delivered in the second half of 2008. The paper gives an overview on the design and operation performance during commissioning and cavity testing.
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| MOPP097 |
Measurements on the Rf Cavity for the ALBA Storage Ring
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781 |
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- M. L. Langlois, M. Cornelis, F. Pérez, P. Sanchez
ALBA, Bellaterra
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ALBA storage ring will use 6 ambient temperature nose cone HOM damped cavities tuned at 500 MHz, designed at BESSY and known as the EU cavity. A first one, manufactured by ACCEL, was delivered in 2007 to investigate on its behaviour. This paper describes the data collected during investigation. First, bead-pull measurements were performed to assess impedance, both on fundamental and high order modes. Emphasis was put on E011, due to the discrepancy between expected values and results for this mode. The vacuum bake-out and related pressure are shown. Then, the cavity was conditioned and observations were made on multipacting levels, conditioning time and surface temperatures. The latter were found inhomogeneous and leads are detailed to avoid local overheating.
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| TUPC147 |
Analogue LLRF for the ALBA Booster
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1416 |
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- H. Hassanzadegan, F. Pérez
ALBA, Bellaterra
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ALBA Booster will inject up to 2 mA of current, at 3 Hz, in the 3 GeV 3rd generation Synchrotron Light Source ALBA, that is in the construction phase in Cerdanyola, Spain. The Booster will ramp the beam energy from 100 MeV to 3 GeV, the RF voltage will be ramped as well from <100 kV to 1 MV to improve injection efficiency and maintain the beam stable. The Booster RF System will have to provide up to 1 MV of accelerating voltage and have a high dynamic range. An Analogue LLRF prototype has been developed for the Booster 5 cell RF Cavity. The prototype is based on the IQ modulation/demodulation technique and it has been designed completely in house. The prototype has been installed in the high power RF lab of CELLS and tested to control up to 80 kW on the real Booster Cavity. The test results of the control loops (amplitude, phase and tuning) will be presented, as well as the hardware structure and the system interface.
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| TUPC148 |
Digital LLRF for ALBA Storage Ring
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1419 |
| |
- A. Salom, F. Pérez
ALBA, Bellaterra
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ALBA is a 3 GeV, 400 mA, 3rd generation Synchrotron Light Source that is in the construction phase in Cerdanyola, Spain. The RF System will have to provide 3.6 MV of accelerating voltage and restore up to 540 kW of power to the electron beam. A Digital LLRF prototype has been developed for the Storage Ring RF Cavity. The prototype is based on the IQ modulation/demodulation technique and it has been implemented using a commercial FPGA cPCI board. The prototype has been installed in the high power RF lab of CELLS and tested to control up to 80 kW on the real Storage Ring Cavity. The test results of the control loops (amplitude, phase and tuning) will be presented, as well as the hardware structure (digital boards, analogue front ends, timing, etc.) and the system interface.
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| TUPP037 |
Impedance and Instabilities for the ALBA Storage Ring
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1622 |
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- T. F. Günzel, F. Pérez
ALBA, Bellaterra
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The geometrical impedance in all 3 planes for most of the vacuum chamber elements of the ALBA storage ring was computed with the 3D-solver GdfidL. Optimisation of some element geometries was carried out in order to reduce dissipative losses and in general the impedance. Resistive wall impedance was calculated analytically. The thresholds of various instabilities were determined on the basis of analytically formulated threshold criteria. The most important are a HOM-driven longitudinal multibunch instability and the transverse resistive wall instability. It is proposed to combat the first one by Landau damping using partial filling and the second one by a transverse feedback system.
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