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
Linear accelerator
Accelerated e-beam
collides with tungsten
target to generate
MeV-level x-rays
Klystron or magnetron
provides MW-level RF power
to accelerate the e-beam
M-592
e-gun
M-5051
vacuum window
L-5822
L-4040 thyratron
S-band klystron
for modulator
May 17, 2011
Electron Devices Division
L-6145
X-band
klystron
PM-2000X
X-band
magnetron
M-5055
X-band
RF driver
2
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
May 17, 2011
Electron Devices Division
3
X-Band Coaxial Magnetron
Typical Performance
Peak Power
2
Frequency Pushing
9.308
1.8
9.306
Frequency [GHz]
Output Power [MW]
1.6
1.4
1.2
1
0.8
9.304
9.302
9.3
9.298
0.6
9.296
0.4
9.294
0.2
0
9.292
0
20
40
60
80
Peak Anode Current [A]
May 17, 2011
Electron Devices Division
100
0
20
40
60
80
Peak Anode Current [A]
100
4
Maximum Repetition Rate (pps)
PM-450X Magnetron
Maximum Operating Conditions
800
700
600
500
400
300
200
Stable operation
100
0
0
5
10
15
20
25
Pulse Length (microseconds)
May 17, 2011
Electron Devices Division
5
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 P)
•
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
May 17, 2011
Electron Devices Division
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X-Band Klystron
L-6145 Test Data
Peak Power
6
5
5.0
Output Power [MW]
Output Power [MW]
Bandwidth
5.5
4
3
2
132 kV, 85 A
125 kV, 73 A
1
4.5
4.0
Bandwidth at fixed drive
3.5
120 kV, 63 A
0
-10
10
30
Input Power [W]
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Electron Devices Division
50
3.0
9.28
9.29
9.30
9.31
9.32
Frequency [GHz]
7
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 s)
• Stangenes SSM 12-21 (200 Hz, 5.8 s)
• 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
May 17, 2011
Electron Devices Division
8
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
•
VSWR
1.3
HFSS
Measurement
1.2
1.1
1
8.9
9.3
Frequency [GHz]
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Electron Devices Division
9.7
9
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
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Electron Devices Division
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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
May 17, 2011
Electron Devices Division
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