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Klystron Power Supplies for ILC

Klystron Power Supplies for ILC. 2nd Korean ILC Workshop December 28-29, 2004 Pohang Accelerator Laboratory Jong-Seok Oh PAL/POSTECH. TESLA 500 RF Requirements. Specifications of the Power Supply. Power Requirements of the RF System. Peak RF power per RF station 9.7 MW

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Klystron Power Supplies for ILC

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  1. Klystron Power Supplies for ILC 2nd Korean ILC Workshop December 28-29, 2004 Pohang Accelerator Laboratory Jong-Seok Oh PAL/POSTECH

  2. TESLA 500 RF Requirements

  3. Specifications of the Power Supply

  4. Power Requirements of the RF System Peak RF power per RF station 9.7 MW Duty cycle 0.685% Average RF power available per RF station 66 kW Klystron efficiency 65% Modulator efficiency 85% Total efficiency 55% AC power per RF station 120 kW Auxiliary power per RF station 14 kW Total wall plug power per station 134 kW Number of active stations 560 Total wall plug power 75MW

  5. Layout of RF System

  6. Overall Layout of the RF System • 572 (1144) klystrons in total • 6 stations for two linacs • ~100 (~200) modulators per station • 12.5 MW ( 25MW) per station e- e+

  7. Principle of TESLA Modulator • Pulse cable : 4 parallel, 6.45 Ohm, max. ~2.8 km • Pulser unit : 2.8m(L) x 1.6m(W) x 2.0 m(H) • Pulse transformer tank : 2m(L) x 1.2m(W) x 1.4m(H), 6.5 ton

  8. TESLA Modulator Status • 10 Modulators have been built, 3 by FNAL and 7 by industry • 8 modulators are in operation • 10 years operation experience exists • Work towards a more cost efficient and compact design has started • Many vendors for modulator components are available

  9. Long Pulse Modulator Options 0 1

  10. Specifications of TESLA and SNS Modulator

  11. Features of SNS Modulator

  12. Pulse Waveform Comparison TESLA modulator SNS modulator

  13. SNS Modulator Circuit

  14. Converter Modulator Assembly IGBT Mounting Oil Pump / Heat XChgR HV Conn. Output Choke Shunt Capacitor Low Inductance Primary Bus Output Diode Rectifier Stepup XFMR

  15. Experiences and Potentials of PAL (1) PLS 200 MW Modulator Max. Peak Power (MW) 200 Peak Output Voltage (kV) 400 Pulse Repetition Rate (Hz) Operating 10 Max. 60 Equi. Pulse Width (ms) 7.5 Flat - top Pulse Width (ms) 4.4 PFN Impedance (W) 2.8 Input Voltage (V, 3f, 60Hz) 480

  16. Experiences and Potentials of PAL (2) Peak output power 111 MW Peak voltage 350 kV Peak current 317 A Load impedance 1104 W Flat top width 2.5 ms HV pulse length 3.5 ms Pulse energy 389 J Pulse repetition rate 100 pps Average output power 38.9 kW C-band Smart Modulator No. 1

  17. Summary • Bouncer modulator is a reasonable baseline design • Units have been tested over many years • Efficiency is ~ 86% and can be improved • Cost estimates 300k$ ~ 400k$ each for 576 units • Upgrades still being investigated • Other operating designs exist • New designs are also of interest • Charging supply technology and power distribution are important issues • PAL has enough potential and experiences for ILC modulator

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