X-Band RF Power Sources for Accelerator Applications
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Transcript of X-Band RF Power Sources for Accelerator Applications
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 Devices960 Industrial Road, San Carlos, CA 94070, USA
5th Collaboration Meeting on X-band Accelerator Structure Design and Test Program
May 17, 2011This 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
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Accelerator System ArchitectureL-3 EDD Products
Accelerated e-beam collides with tungsten target to generateMeV-level x-rays
Electron gun injects kV-level e-beam
Linear accelerator
M-592e-gun
Klystron or magnetron provides MW-level RF power
to accelerate the e-beam
M-5051vacuum window
L-4040 thyratron for modulator
L-5822 S-band klystron
PM-2000XX-band
magnetronL-6145 X-bandklystron
M-5055X-band
RF driver
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X-Band Magnetron ProductsWater-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
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X-Band Coaxial MagnetronTypical Performance
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0.2
0.4
0.6
0.8
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1.2
1.4
1.6
1.8
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0 20 40 60 80 100
Out
put P
ower
[MW
]
Peak Anode Current [A]
Peak Power
9.292
9.294
9.296
9.298
9.3
9.302
9.304
9.306
9.308
0 20 40 60 80 100
Freq
uenc
y [G
Hz]
Peak Anode Current [A]
Frequency Pushing
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0 5 10 15 20 25
Max
imum
Rep
etiti
on R
ate
(pps
)
Pulse Length (microseconds)
Stable operation
PM-450X MagnetronMaximum Operating Conditions
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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
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3.0
3.5
4.0
4.5
5.0
5.5
9.28 9.29 9.30 9.31 9.32
Out
put P
ower
[MW
]
Frequency [GHz]
Bandwidth
X-Band KlystronL-6145 Test Data
Bandwidth at fixed drive
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-10 10 30 50
Out
put P
ower
[MW
]
Input Power [W]
Peak Power
132 kV, 85 A
125 kV, 73 A
120 kV, 63 A
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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 fromStangenes Industries under part number SI-020348
• Klystron, solenoid, oil tank and modulator can be integrated in a compact package
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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
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1.2
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8.9 9.3 9.7
VS
WR
Frequency [GHz]
HFSSMeasurement
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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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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