X-Band RF Power Sources for Accelerator Applications Mark Kirshner, Richard Kowalczyk, Craig Wilsen, Richard True, Ian Simpson and John Wray L-3 Communications Electron Devices 960 Industrial Road, San Carlos, CA 94070, USA 5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program May 17, 2011 This presentation consists of information published and generally available to the public and does not contain controlled technical data as defined within the International Traffic in Arms (ITAR) Part 120.10 or Export Administration Regulations (EAR) Part 734.7-11

Accelerator System Architecture L-3 EDD Products Electron gun injects kV-level e-beam Accelerated e-beam collides with tungsten target to generate MeV-level x-rays M-592 e-gun Linear accelerator Klystron or magnetron provides MW-level RF power to accelerate the e-beam M-5051 vacuum window L-5822 S-band klystron PM-2000X X-band magnetron L-6145 X-band klystron L-4040 thyratron for modulator M-5055 X-band RF driver

X-Band Magnetron Products Water-Cooled, 9.3 GHz PM-450X Series PM-1100X Series PM-2000X Series 400 kW peak 1.8 MW peak 2.2 MW peak 1200 W ave 1600 W ave 600 W ave 35 – 38 kV 36 – 38 kV 34 – 38 kV 34 A 88 A 110 A 8 s pulse length 4.5 s pulse length 2.5 s pulse length

X-Band Coaxial Magnetron Typical Performance

PM-450X Magnetron Maximum Operating Conditions

L-6145 X-Band Klystron Robust X-band klystron capable of reliable high peak and average power operation 5 MW peak at 9.3 GHz 20 kW average 0.4 percent duty 130 kV / 85 A (~1.8 mP) Solenoid focusing Cathode-pulsed diode gun Operating parameters and physical configuration similar to EDD’s L-5822 S-band klystron to allow use of existing modulator

X-Band Klystron L-6145 Test Data Bandwidth at fixed drive

Klystron Based RF Source The L6145 is now a production klystron “Plug-and-play” with existing S-Band medical and industrial linac modulators, available from multiple sources Stangenes SI-21271 (275 Hz, 8 ms) Stangenes SSM 12-21 (200 Hz, 5.8 ms) ScandiNova K1 The solenoid can be purchased from Stangenes Industries under part number SI-020348 Klystron, solenoid, oil tank and modulator can be integrated in a compact package

Water-cooled vacuum window 5 MW peak, 20 kW average M-5051 RF Vacuum Window Water-cooled vacuum window 5 MW peak, 20 kW average Multipactor suppressant coating is applied to both sides of the beryllia window ceramic Additional windows with dual vacuum flanges available for accelerator system HFSS Measurement

M-5055 X-Band RF Driver Solid-state amplifier to drive the L-6145 X-band klystron Center frequency 9.3 GHz Available in 50 watt or 100 watt configuration

Conclusion L-3 Communications Electron Devices Division (EDD) has developed an array of RF components operating at 9.3 GHz to address the growing market for X-band accelerators Coaxial magnetrons with 400 kW to 2.2 MW peak power and average power to 1600 watts Klystrons to 5 MW peak and 20 kW average power X-band RF drivers to 100 watts High power RF vacuum windows