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power-supply

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MOP027 Distributed RF Scheme (DRFS) - Newly Proposed HLRF Scheme for ILC klystron, cavity, radiation, HLRF 112
 
  • S. Fukuda
    KEK, Ibaraki
  
 

Distributed RF Scheme (DRFS) was proposed for International Linear Collider (ILC) as a new HLRF scheme. After the ITRP recommendation, ILC technology was chosen to be superconducting technology and basic design was discussed and reported in the RDR on 2007. Aiming for the cost reduction, there have been proposed many ideas and summarized as SB2009 proposal. DRFS is the one of these proposals, and it is linked to the single tunnel plan. DRFS employs many small klystrons (750kW output power) which feed power to two superconducting cavities. 13 modulating anode klystrons are operated by a DC power supply and a modulating anode pulser. All required components are installed in a tunnel and therefore this scheme is a complete single tunnel layout. DRFS was proposed in 2008 and thereafter it has been discussed in web-ex meeting and GDE workshop. In this conference, concept and detailed design of DRFS are presented including the availability and operability. In order to show the feasibility of DRFS, KEK has a plan of demonstration employing the DRFS with two klystrons in the S1 global in the end of 2010. Presenter also discussed pros and cons comparing with the competing proposed scheme.

  
THP056 Development of a 300-Kv Solid State Modulator for an Argonne XFELO Injector* gun, controls, cathode, high-voltage 881
 
  • A.R. Cours, G. Trento
    ANL, Argonne
  
 

A solid state Marx-based pulsed voltage supply is being developed at Argonne National Laboratory (ANL) with the capability of providing 300-kV pulses with 0.5-μs rise time, 1-μs fall time, 2-μs pulse flat top, and up to 10-Hz repetition rate. The supply is designed to operate a direct current (DC) thermionic prototype gun producing ≈ 0.1-μm beam emittance, a part of the ANL x-ray free-electron laser oscillator (XFELO) injector feasibility studies. The pulsed supply utilizes isolated gate bipolar transistor (IGBT) devices. Stage switching allows this supply to quickly charge the 200-pF gun capacitance and maintain 300-mA gun current during the pulse flat top. A second string of IGBT switches charges the stage capacitors and acts as a 'crowbar' to quickly remove high voltage from the gun at the pulse's fall time or during load arcing. We present an overview of the design and development of the XFELO injector DC gun pulsed power supply.


* Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH1137.

  
THP115 The Development of the H- Ion Source Test Stand for CSNS ion, ion-source, extraction, controls 1007
 
  • H.F. Ouyang, Y.L. Chi, W. He, T. Huang, G. Li, Y.M. Liu, Y.H. Lu, X.B. Wu, T.G. Xu, H.S. Zhang, J. S. Zhang, F.X. Zhao
    IHEP Beijing, Beijing
  • D.C. Faircloth
    STFC/RAL, Chilton, Didcot, Oxon
  
 

The type of the H- ion source foe CSNS is a Penning Surface Plasma Source (SPS). The output energy of the source is 50keV and the pulsed current of H- beam is 20mA with a rms. emittance of 0.2π mm.mrad. The construction of H- ion source test stand for CSNS is finished and commissioning of the source is being done. Up to now, stable H- ion beam with a current up to 45mA and energy of 50keV is achieved. Emittance measurements of the beam is also being prepared.