1. 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 or Export Administration Regulations (EAR) Part

2. 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

3. 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

4. X-Band Coaxial Magnetron Typical Performance

5. PM-450X Magnetron Maximum Operating Conditions

6. 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

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

8. 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 (275 Hz, 8 ms)
Stangenes SSM (200 Hz, 5.8 ms)
ScandiNova K1
The solenoid can be purchased from
Stangenes Industries under part number SI
Klystron, solenoid, oil tank and modulator
can be integrated in a compact package

9. 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

10. 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

11. 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