Transcript Outline

Overview of UCD MURI Gyro-Device Program
October 1999
Started 1 May 99
PI:
Prof. N.C. Luhmann, Jr.
Staff:
Y. Hirata and D.B. McDermott
Students: R.C. Stutzman, S.B. Harriet, W.Y. Li, and L.J. Dressman
Collaborating Scientists:
D.A. Gallagher, Northrop Grumman
A.T. Lin, UCLA
T.A. Spencer, AFRL
Q.S. Wang, Micramics
Presenter: Y. Hirata
MURI99 Kick-Off Meting
SLAC November 12, 1999
MVE MURI 99 Kick-off Meeting
R. Barker, Technical Monitor
Started 1 May 99
OUTLINE
October 1999
UCD MURI Gyro-Device Program
• High Performance 94GHz Gyro-TWT Amplifier
• 94GHz Sixth-Harmonic Gyrotron
• Ka-Band Second-Harmonic Gyro-TWT Amplifier
• High Efficiency Ka-Band Second-Harmonic Peniotron
MVE MURI 99 Kick-off Meeting
R. Barker, Technical Monitor
High Performance 94 GHz TE01 Gyro-TWT Amplifier
October 1999
Started 1 May 99
50 kG Superconducting Magnet
Objectives
• Extend DoD’s TWT technology
into millimeter range
• Develop stable W-band 100kW
gyro-amplifier
Accomplishments
Approach
• Gyro-TWTs offer wide bandwidth
• TE01 mode transmits high power
• Mode-selective circuit and loss
stabilize amplifier by suppressing
competing modes
MVE MURI 99 Kick-off Meeting
• 94 GHz, 100 kW gyro-TWT is
under construction
- MIG gun is being fabricated
- Modulator tested for 100W CC-TWT
- Mode-selective circuit developed
- Loss determined by stability codes
- h=20% predicted by large-signal code
R. Barker, Technical Monitor
Modeling and Design of a
100 kW, 94 GHz TE01 Gyro-TWT
Started 1 May 99
Electron Trajectories of MIG
50
100 kV
40 r = 0
100
Power (kW)
s
I (A)
20
Third
TE
(m)
m1
0
0
0.5
1
v /v
^
z
1.5
10
1
0.1
0.01
0.001
0.0001
2
0
2
4
6
8
10
12
14
z (cm)
Linear Codes for Stability
MVE MURI 99 Kick-off Meeting
termination unloaded
1000
Second
30
10
HFSS for Coupler Design
First
Harmonic
c
October 1999
Nonlinear Codes for Saturation
R. Barker, Technical Monitor
94 GHz Sixth-Harmonic Gyrotron
Started 1 May 99
(MURI 95)
Objectives
October 1999
12-Vane Slotted Circuit
• Reduce magnetic field to make lighter
and more practical HPM systems
• Develop 25-100 kW W-band high
harmonic gyrotrons
• Basis for high-harmonic
gyro amplifiers
Accomplishments
Approach
• Operation at sth-harmonic reduces
magnetic field by factor of s
• Cusp gun produces needed axisencircling electron beam
• Slotted circuit enhances interaction
MVE MURI 99 Kick-off Meeting
• Two Northrop Cusp guns received
• 94GHz 6th-harmonic gyrotron design
- 50 kW with 20% efficiency
- Under construction
• 94GHz 8th-harmonic gyrotron design
- Employs permanent magnet
R. Barker, Technical Monitor
Ka-Band Second-Harmonic Gyro-TWT Amplifier
October 1999
Started 1 May 99
Northrop Grumman Cusp Gun
Objectives
• Improve stability and power level of
gyrotron amplifiers
• Increase efficiency and frequency of
our recent 200kW Ku-band TE21
second-harmonic gyro-TWT
Approach
Accomplishments
• Harmonic gyro-devices are more
stable and yield higher power
• 35GHz, 50 kW gyro-TWT designed
with h=20%
- Employs Northrop Cusp gun
- Tested designed 0 dB coupler
- Tested mode-selective circuit
- Determined loss with stability codes
• Sliced mode-selective circuit
suppresses competing modes
• Axis-encircling electrons will yield
full efficiency in linearly polarized
mode-selective circuit
MVE MURI 99 Kick-off Meeting
R. Barker, Technical Monitor
High Efficiency Ka-Band Second-Harmonic Peniotron
October 1999
Started 1 May 99
4-Vane Slotted Circuit
Objectives
• Improve device efficiency of Tohoku’s
recent third-harmonic h=35% peniotron
• Achieve device efficiency > 50%
in harmonic gyro-device
• Foundation for peniotron-amplifiers
Approach
•
Accomplishments
sth-harmonic
peniotron excites
mth-order azimuthal mode with m=s+1 • Received two Northrop Cusp guns
• 35GHz 2nd-harmonic peniotron design
• Slotted circuit enhances interaction
- 150 kW with 50% device efficiency
and allows desired mth-order
symmetry in stable, lowest-order mode - Employs Northrop Cusp gun
• Cusp gun produces needed
axis-encircling electron beam
MVE MURI 99 Kick-off Meeting
R. Barker, Technical Monitor
Facilities and Equipment (1)
October 1999
Started 1 May 99
Modulator #1
Modulator #2
Network Analyzer
MVE MURI 99 Kick-off Meeting
R. Barker, Technical Monitor
TWTs
Facilities and Equipment (2)
October 1999
Started 1 May 99
Phase-Noise Test Stand
Frequency Multiplier Test Setup
MVE MURI 99 Kick-off Meeting
W-Band TWT
Super-Conducting Magnets
R. Barker, Technical Monitor