1 Student ： Chih Te Huang Advisor ： Yi Sheng Yeh Study of Mode Competition in Gyrotrons.
15
1 Student ： Chih Te Huang Advisor ： Yi Sheng Yeh Study of Mode Competition in Gyrotrons
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Transcript of 1 Student ： Chih Te Huang Advisor ： Yi Sheng Yeh Study of Mode Competition in Gyrotrons.
1
Student ： Chih Te Huang
Advisor ： Yi Sheng Yeh
Study of Mode Competition in Gyrotrons
2
Gyrotron Traveling Wave Amplifier
◆ The gyrotron traveling wave amplifier (gyro-TWA) is a high-power, broadband and millimeter-wave amplifier.
RF input Output power
Electron beam
MagnetronInjection Gun
Drift Regionfor Magnetic Compression
Gyrotron Circuit
[ NTHU ]
◆ A Ka-band distributed-loss gyro-TWT is experimentally to produce a 93 kW saturated peak power. A W-band gyro-TWT with distributed losses has a saturated peak power of 59 kW.
3
1. Gyro-TWA with uniform structure (I)
(a ) p h y sica l co n f ig u ra tio n
0 .00 .10 .20 .30 .40 .5
r w (
cm)
(b ) p ro f ile o f w a ll re s is tiv ity
11 0 21 0 41 0 6
0 5 1 0
z (cm )
cu
d riv e s tag e
z 1 z 2
-2 0 -1 0 0 1 0 2 0-1 5 -5 5 1 5k z (cm -1 )
0
4 0
8 0
2 0
6 0
1 0 0
f (
GH
z)
s= 1
s= 2
A m p lif ic a tio n
V = 9 5 k V
O sc illa tio n
rw = 0 .2 6 5 4 cm
B 0 = 1 2 .5 K G
TE11
TE21
4
1. Gyro-TWA with uniform structure (II)
P in
0 .0 0 1
0 .0 1
0 .1
1
1 0
Pou
t(TE
11,kw)
Ib=1.25A TE 11 am fw d(sing le m ode)
Ib=1.25A TE 11 am fw d(m ulti m ode)
Ib=1.25A TE 21 am bw d(m ulti m ode)
0
1
2
3
4
5
Pou
t(TE
21,kw)
L = 6cm I b=1 .25A ( V b= 87 .7 5kV ,B 0= 12 .38kG )
1 1 0 1 0 2 1 0 3 1 0 4
P in
0 .0 0 1
0 .0 1
0 .1
1
1 0
Pou
t(TE
11,k
w)
Ib=1.25A TE 11 am fw d(sing le m ode)
Ib=1.25A TE 11 am fw d(m ulti m ode)
Ib=1.25A TE 21 am bw d(m ulti m ode)
0
1
2
3
4
5
Pou
t(TE
21,k
w)
L = 8 c m I b=1 .25A ( V b= 87 .7 5kV ,B 0= 12 .38kG )
1 1 0 1 0 2 1 0 3 1 0 4
P in
0 .0 0 1
0 .0 1
0 .1
1
1 0
Pou
t(TE
11,k
w)
Ib=1.25A TE 11 am fw d(sing le m ode)
Ib=1.25A TE 11 am fw d(m ulti m ode)
Ib=1.25A TE 21 am bw d(m ulti m ode)
0
1
2
3
4
5
Pou
t(TE
21,k
w)
L = 1 2 cm I b=1 .25A ( V b=87 .7 5kV ,B 0=12 .38kG )
1 1 0 1 0 2 1 0 3 1 0 4
P in
0 .0 0 1
0 .0 1
0 .1
1
1 0
Pou
t(TE
11,k
w)
Ib=1.25A TE 11 am fw d(sing le m ode)
Ib=1.25A TE 11 am fw d(m ulti m ode)
Ib=1.25A TE 21 am bw d(m ulti m ode)
0
1
2
3
4
5
Pou
t(TE
21,k
w)
L = 1 0 cm I b=1 .25A ( V b=87 .7 5kV ,B 0=12 .38kG )
1 1 0 1 0 2 1 0 3 1 0 4
TE11 TE21
5
1. Gyro-TWA with uniform structure (III)
0 0 .4 0 .8 1 .2 1 .6 2 2 .4 2 .8 3 .2 3 .6 4
Ib
3 0
6 0
9 0
1 2 0
Po
ut(T
E11
,kw
)
TE 11 am fw d(s ing le m ode)
TE 11 am fw d(m ulti m ode)
TE 21 am bw d(m ulti m ode)
0
2
4
6
8
10
Po
ut(T
E21
,kw
)
L = 1 0 cm P in=1kw ( V b=87 .7 5kV ,B 0=12 .38kG )
0 0 .4 0 .8 1 .2 1 .6 2 2 .4 2 .8 3 .2 3 .6 4
Ib
3 0
6 0
9 0
1 2 0
Po
ut(T
E11
,kw
)
TE 11 am fw d(single m ode)
TE 11 am fw d(m ulti m ode)
TE 21 am bw d(m ulti m ode)
0
2
4
6
8
10
Po
ut(T
E21
,kw
)
L = 10 cm P = 2 k w ( V b=87 .7 5kV ,B 0=12 .38kG )
TE11 TE21
6
1. Gyro-TWA with uniform structure (IV)
0 0 .4 0 .8 1 .2 1 .6 2 2 .4 2 .8 3 .2 3 .6 4
Ib
4 0
8 0
1 2 0P
out
(TE
11,k
w)
0
4
8
12
Po
ut(T
E21
,kw
)
L = 1 2 cm P in=2kw ( V b=87 .7 5kV ,B 0=12 .38kG )
0 0 .4 0 .8 1 .2 1 .6 2 2 .4 2 .8 3 .2 3 .6 4
Ib
3 0
6 0
9 0
1 2 0
Po
ut(T
E11
,kw
)
0
3
6
9
12
15
Po
ut(T
E21
,kw
)
L = 8cm P = 2 k w ( V b=87 .7 5kV ,B 0=12 .38kG )
TE11 (single mode)
TE21 (multi mode)
TE11 (multi mode)
TE11 TE21
7
2. Gyro-TWA with non-uniform structure (I)
P in
0 .1
1
1 0
1 0 0
Po
ut(K
W)
00.20.40.60.811.21.41.61.82
PO
SC
(RE
LAT
IVE
SC
ALE
)
I b= 0.26 A ( V b= 91 .85k V ,B 0= 12 .86 k G )
1 1 0 1 0 2 1 0 3 1 0 4
P in
0 .1
1
1 0
1 0 0
Pou
t(KW
)
00.20.40.60.811.21.41.61.82
PO
SC
(RE
LAT
IVE
SC
ALE
)
I b= 0 .40 A ( V b= 9 3 .1 3 k V ,B 0= 12 .7 8 k G )
1 1 0 1 0 2 1 0 3 1 0 4
TE11 TE21
TE11(single mode)TE11(multi mode)
TE21(multi mode)
Larry R. Barneet , Lung Hai Chang, Han Ying Chen, Kwo Ray Chu, Wai Keung Lau , and Chuan Cheng Tu, “Absolute instability
competition and suppression in a millimeter-wave gyrotron traveling-wave tube,” The American Physical Society, 1989.
8
2. Gyro-TWA with non-uniform structure (II)
P in
0 .1
1
1 0
1 0 0
Pou
t(KW
)
00.20.40.60.811.21.41.61.82
PO
SC
(RE
LAT
IVE
SC
ALE
)
Ib= 1.25A ( V b= 91 .7 3k V ,B 0= 12.38k G )
1 1 0 1 0 2 1 0 3 1 0 4
P in
0 .1
1
1 0
1 0 0
Po
ut(K
W)
00.20 .40 .60 .811.21 .41 .61 .82
PO
SC
(RE
LAT
IVE
SC
ALE
)
I b= 1.45A ( V b= 91 .7 3k V ,B 0= 12.38k G )
1 1 0 1 0 2 1 0 3 1 0 4
TE11 TE21
TE11(single mode)TE11(multi mode)
TE21(multi mode)
Larry R. Barneet , Lung Hai Chang, Han Ying Chen, Kwo Ray Chu, Wai Keung Lau , and Chuan Cheng Tu, “Absolute instability
competition and suppression in a millimeter-wave gyrotron traveling-wave tube,” The American Physical Society, 1989.
9
3. Gyro-TWA with sever (I)
(a ) p h y sica l co n f ig u ra tio n
0 .00 .10 .20 .30 .40 .5
r w (
cm)
(b ) p ro f ile o f w a ll re s is tiv ity
11 0 21 0 41 0 6
0 5 1 0 1 5 2 0
z (cm )
cu
d riv e s tag e
z 1 z 2
se rv e red sec tio n
10
3. Gyro-TWA with sever (II)
P in
0 .1
1
1 0
1 0 0
TE
11 P
ou
t(KW
)
0
2
4
6
8
10
TE
21
Po
ut(K
W)
Ib= 1.85A ( V b= 89 .5k V ,B 0= 12.15k G )
1 0 21 0 11 0 -1 1
ρ3 = 1.0 × 105ρcu
TE11 TE21
TE11(single mode)
TE11(multi mode)
TE21(multi mode)
Kwo Ray Chu, Larry R. Barnett, Wai Keung Lau, and Lung Hai Chang, “RECENT DEVELOPMENTS IN MILLIMETER
WAVE GYRO-TWT RESEARCH AT NTHU,” IEEE, 1990.
11
4. Gyro-TWA with distributed wall losses
1 e -0 0 7 1 e -0 0 5 0 .0 0 1P in (W )
1
1 0
1 0 0
Pou
t (kW
)
0 .2
0 .4
0 .6
0 .8
1
Am
plit
ude
I b= 7 .2 8 A
phase-locking oscillation mode
)1(11TE
)2(21TE
12
0 0 .4 0 .8 1 .2 1 .6 2 2 .4 2 .8 3 .2 3 .6 4
Ib
3 0
6 0
9 0
1 2 0
Pou
t(T
E11
,kw
)
TE11 am fw d(single m ode)
TE11 am fw d(m ulti m ode)
TE21 am bw d(m ulti m ode)
0
2
4
6
8
10
Pou
t(T
E21
,kw
)
L = 10 cm P in=1kw ( V b=87 .7 5kV ,B 0=12 .38kG )
In the Gyro-TWA with uniform structure, The simulation results show, the complete suppression of this instability by the application of the TE11 drive has been observed. And has analyzed, Due to the TE21 oscillation generate the power that is reduced the issue between the single mode gyro-TWAs and the multi mode gyro-TWAs.
In the Gyro-TWA with non-uniform structure, The simulation results show, as
the result of uniform structure of gyro- TWAs. In single-mode gyro-TWA, when the operation current reached 1.25 A, The TE11 mode output power has become weak that is different from multi-mode gyro-TWAs.
Conclusions (I)
P in
0 .1
1
1 0
1 0 0P
ou
t(KW
)
00.20.40.60 .811.21.41.61 .82
PO
SC
(RE
LAT
IVE
SC
ALE
)
I b= 1.25A ( V b= 91 .7 3k V ,B 0= 12.38k G )
1 1 0 1 0 2 1 0 3 1 0 4
P in
0 .1
1
1 0
1 0 0
Po
ut(K
W)
00.20.40.60 .811.21.41.61 .82
PO
SC
(RE
LAT
IVE
SC
ALE
)
Ib= 1.45A ( V b= 91 .7 3k V ,B 0= 12.38k G )
1 1 0 1 0 2 1 0 3 1 0 4
0 0 .4 0 .8 1 .2 1 .6 2 2 .4 2 .8 3 .2 3 .6 4
Ib
3 0
6 0
9 0
1 2 0
Po
ut(T
E11
,kw
)
TE 11 am fw d(s ingle m ode)
TE 11 am fw d(m ulti m ode)
TE 21 am bw d(m ulti m ode)
0
2
4
6
8
10
Po
ut(T
E21
,kw
)
L = 1 0 cm P = 2 k w ( V b= 87 .7 5kV ,B 0= 12 .38kG )
P in
0 .1
1
1 0
1 0 0
Po
ut(K
W)
00.20.40.60.811.21.41.61.82
PO
SC
(RE
LAT
IVE
SC
ALE
)
I b= 0 .40 A ( V b= 9 3 .1 3 k V ,B 0= 12 .7 8 k G )
1 1 0 1 0 2 1 0 3 1 0 4
P in
0 .1
1
1 0
1 0 0
Po
ut(K
W)
00.20.40.60.811.21.41.61.82
PO
SC
(RE
LAT
IVE
SC
ALE
)
I b= 0 .26 A ( V b= 9 1 .8 5k V ,B 0= 1 2 .8 6 k G )
1 1 0 1 0 2 1 0 3 1 0 4
13
Conclusions (II)
In the Gyro-TWA with sever, Increase the drive power can be effective suppression of TE21 mode oscillation.
In the Gyro-TWA with distributed wall losses, when the traveling wave tube operating in the phase-locking oscillation mode can be effective suppression the oscillation of non-operating mode.
1 e-0 0 7 1 e-0 0 5 0 .0 0 1P in (W )
1
1 0
1 0 0
Pou
t (kW
)
0 .2
0 .4
0 .6
0 .8
1
Am
plit
ude
I b= 7 .2 8 A
)1(11TE
)2(21TE
P in
0 .1
1
1 0
1 0 0
TE
11 P
out(K
W)
0
2
4
6
8
10
TE
21
Pou
t(KW
)
I b= 1.85A ( V b= 89 .5k V ,B 0= 12.15k G )
1 0 21 0 11 0 -1 1
(2)
14
References (Ⅰ)
1. K. R. Chu, G. Guo and V. L. Granatstein, “Theory of the harmonic multiplying gyrotron traveling wave amplifier,” Phys. Rev. Lett., vol. 78, no. 24, pp. 4461-4464, 1997.
2. V. L. Granatstein, and I. Alexeff, High-power Microwave Source, Artech House, 1985.
3. J. Rodgers, H. Guo, G. S. Nusinovich, V. L. Granatstein, “Experimental study of phase deviation and pushing in a frequency doubling,” IEEE Trans. Electron Devices, vol. 48, no. 10, pp. 2434-2441, 2001.
4. K. R. Chu, G. Guo and V. L. Granatstein, “Theory of the harmonic multiplying gyrotron
traveling wave amplifier,” Phys. Rev. Lett., vol. 78, no. 24, pp. 4461-4464, 1997.
5 .A. T. Lin, C. C. Lin, “Amplification mechanism in the output section of the harmonic
multiplying grotron traveling-wave amplifier,” IEEE Trans. Plasma Sci., vol. 30, no. 3, pp.
931-937, 2002.
6. 朱國瑞 , 張存續 , 陳仕宏 , 電子迴旋脈射－原理與應用 , 物理雙月刊 , 2006.
15
References (Ⅱ)
7. C. W. Baik, S. G. Jeon, D. H. Kim, N. Sato, K. Yokoo, and G. S. Park, IEEE Trans. Electron Devices 52, 829 (2005)
8. S. Y. Park, V. L. Granatstein, and R. K. Parker, “A Linear theory and design study for a gyrotron backward-wave oscillator,” Int. J. Electronics, vol. 57, pp. 1109-1123, 1984.
9. Y. Y. Lau, K. R. Chu, L. R. Barnett, and V. L. Granatstein, “Gyrotron Traveling Wave Amplifier : I. Analysis of Oscillation,” Int. J. Infrared Millimeter Waves, vol. 2, pp. 373-393, 1981.
10. K. R. Chu, H. Y. Chen, C. L. Hung, T. H. Chang, L. R. Barnett, S. H. Chen, and T. T. Yang, “Ultra high gain gyrotron traveling wave amplifier, “Phys. Rev. Lett., vol. 81, pp. 4760-4763, 1998.
11. K. R. Chu, H. Y. Chen, C. L. Hung, T. H. Chang, L. R. Barnett, S. H. Chen, T. T. Yang, and D. J. Dialetis, “Theory and experiment of ultrahigh-gain gyrotron traveling wave amplifier,” IEEE Trans. Microwave Theory Tech., vol. 27, no. 2, pp. 391-404, 1999.
12. Larry R. Barneet , Lung Hai Chang, Han Ying Chen, Kwo Ray Chu, Wai Keung Lau , and Chuan Cheng Tu, “Absolute instability competition and suppression in a millimeter-wave gyrotron traveling-wave tube,” The American Physical Society, 1989.
13. Kwo Ray Chu, Larry R. Barnett, Wai Keung Lau, and Lung Hai Chang, “RECENT DEVELOPMENTS IN MILLIMETER WAVE GYRO-TWT RESEARCH AT NTHU,” IEEE, 1990.
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