rf pulse compression and transport systems
Post on 19-Jan-2016
31 Views
Preview:
DESCRIPTION
TRANSCRIPT
Rf Pulse Compression and Transport Systems
Sami G. Tantawi
Outline• Single Moded Delay Line Distribution System
– Components required to implement the system• Components Based on the wrap-around mode converter
• components based on over-moded rectangular waveguides
• Multi-Moded Delay Line Distribution System– Components required to implement the system (Launcher and Extractor)
• Components based on the wrap-around mode converter
• Components based on over-moded rectangular waveguides
• Experimental and Theoretical development tools. – Over-moded test setup
– Scattering Matrix Codes
– High power test setups
TE21
TE01 Mode Extractor
TE01
TE12 (Vertically Polarized)
TE01
TE12 (Vertically Polarized)TE12 (Horizontally Polarized)
Accelerator Structure (~1.8 m)
~7.4 cm Circular Waveguide
TE01
Mode Launcher (Fed by Four Rectangular Waveguides)
Klystrons
~ 6 m
TE12 to TE01 Mode Converter
~53 m
~12.7 cm Circular Waveguide
TE01 Tap-Off TE01 Mode Converter (Fed by Four Rectangular Waveguides)
TE21-TE01 Mode Converter
TE01 Mode Extractor(Power is Extracted Evenly Between Four Waveguides)
0.75
0.8
0.85
0.9
0.95
1
1.05
1.1
3 4 5 6 7 8 9
Single-Moded DLDSMulti-Moded DLDS
Rel
ativ
e C
ost o
f th
e rf
Sys
tem
Compression Ratio
Compression Ratio=WidthPulserAccelerato
WidthPulseKlystron
Cost Model
)1(max rm Ct
rC
T
2max r
gm
Cvtl
crkk
aac CnP
PNN
2
1max gm
k
aa
ck
vt
P
PN
nL
k
aa
crk P
PN
CN
1
rkk
aakmk SA
P
PNSSSS 0
000
0
1111 m
r
sm
r
sm
k
aa
cr
rsmmkm A
C
k
C
k
P
PN
C
CkANS
cc
r
pl
vll
rg
ckk
aaccc
pl
vlc nA
CDAAR
Cv
Pn
PNnANLDAAS
1
2
)1(
ka
r
rkk C
CAA
00
r
cpl
vll
r
k
c
r
sm
r
sm
m
a
r
r
rc
smc
vl
plmlkrr
C
nDkkR
C
n
k
C
k
C
kk
C
C
C
kkkkkRnDCS
k
2
)1(111
),,,,;,,,(
00
c
gvlv
lk
cc
k
mm A
vAk
A
Ak
A
Ak
,,
00
c
gplp
l A
vAk
Single Moded DLDS
3
771.46901DTE dB/S;
itc 9.0
rk Cn
5.0lR
1i
3
3
456.8
456.8
101
101
Dr
CD
t
C
r
T h e s y s t e m r e q u i r e s t h e f o l l o w i n g c o m p o n e n t s :
i . )( rk Cn h y b r i d s ( e a c h h y b r i d i s c o u n t e d a s o n e c o m p o n e n t )
i i . )( rk Cn l o a d s ( e a c h l o a d i s c o u n t e d a s o n e c o m p o n e n t )
i i i . rC2 T E 0 1 b e n d ( e a c h b e n d i s c o u n t e d a s o n e c o m p o n e n t )
i v . )1(log2 2 r
r CC
h i g h p o w e r h y b r i d s , e a c h h y b r i d i s c o u n t e d a s t w o c o m p o n e n t s .
v . 2
rC s u p e r - h i g h p o w e r h y b r i d s , e a c h i s c o u n t e d a s f o u r c o m p o n e n t s
H e n c e , t h e t o t a l n u m b e r o f c o m p o n e n t s i s g i v e n b y :
)1(log2 2 rrkc CCnn .
Single Moded DLDS3
771.46901DTE dB/S;
itc 9.0
rk Cn
5.0lR
1i
3
3
456.8
456.8
101
101
Dr
CD
t
C
r
T h e s y s t e m r e q u i r e s t h e f o l l o w i n g c o m p o n e n t s :
i . )( rk Cn h y b r i d s
i i . )( rk Cn l o a d s
i i i . rC2 T E 0 1 b e n d
i v . )1(log2 2 r
r CC
h i g h p o w e r h y b r i d s
v . 2
rC s u p e r - h i g h p o w e r h y b r i d s
v i . 4
3 rC t a p - o f f s
systemunitKlystronsofNumbern
RationCompressioC
k
r
/
T h e s y s t e m r e q u i r e s t h e f o l l o w i n g c o m p o n e n t s :
i . )( rk Cn h y b r i d s
i i . )( rk Cn l o a d s
i i i . rC2 T E 0 1 b e n d
i v . )1(log2 2 r
r CC
h i g h p o w e r h y b r i d s
v . 2
rC s u p e r - h i g h p o w e r h y b r i d s
v i . 4
3 rC t a p - o f f s
systemunitKlystronsofNumbern
RationCompressioC
k
r
/
Single-Moded DLDS
Multi-Moded DLDS ;5.01
m
rp n
Cn
)1(
)1(2/1(
rr
pmrpl CC
nnCnR
m
pmrj
mj
pmjn
j
nnjC
n
nn
rt C 1
120
20
20
10
101
1011
1
T h e s y s t e m r e q u i r e t h e f o l l o w i n g c o m p o n e n t s :
i . )( rk Cn h y b r i d s
i i . )( rk Cn l o a d s
i i i . )( pr nC T E 0 1 b e n d
i v . pn m o d e l a u n c h e r .
v . )( pr nC m o d e e x t r a c t o r s .
systemunitKlystronsofNumbern
RationCompressioC
k
r
/
DDTE
67185.1336.909312 dB/S
3
771.46901DTE dB/S;
rl CR
1
r
rCoff
sonsoff
s
Coffs
r
tC
1
111
3
456.8
10 D
T h e s y s t e m r e q u i r e t h e f o l l o w i n g c o m p o n e n t s :
i . )( rk Cn h y b r i d s ( e a c h h y b r i d i s c o u n t e d a s o n e c o m p o n e n t )
i i . )( rk Cn l o a d s ( e a c h l o a d i s c o u n t e d a s o n e c o m p o n e n t )
i i i . rC T E 0 1 b e n d ( e a c h b e n d i s c o u n t e d a s o n e c o m p o n e n t )
i v . O n e T E 0 1 m o d e l a u n c h e r , ( c o u n t e d a s t w o c o m p o n e n t s ) .
v . )1( rC s w i t c h e s ( e a c h c o u n t e d a s s i x c o m p o n e n t s ) .
T h e t o t a l n u m b e r o f c o m p o n e n t s i s g i v e n b y
452 rkc Cnn .
Active DLDS
Single-Moded BPC
hCC
R rhr
l 1log2
11
1
22
rk
r
rkk
Cn
PC
Cn
P
n
P
h
75
2log
75
2
75
2log
max2
maxmax2
3
3
9.16
9.16
101
101
Dr
CD
t
C
r
T h e s y s t e m r e q u i r e t h e f o l l o w i n g c o m p o n e n t s :
i . )2( kn h y b r i d s ( e a c h h y b r i d i s c o u n t e d a s o n e c o m p o n e n t )
i i . )2( kn l o a d s ( e a c h l o a d i s c o u n t e d a s o n e c o m p o n e n t )
i i i . 2 rC T E 0 1 b e n d ( e a c h b e n d i s c o u n t e d a s o n e c o m p o n e n t )
i v .
1
22
hrC
h h i g h p o w e r h y b r i d s , ( c o u n t e d a s f o u r c o m p o n e n t s ) .
v .
1
22
hrC
s p l i t t e r s ( e a c h c o u n t e d a s t h r e e c o m p o n e n t s ) .
T h e t o t a l n u m b e r o f c o m p o n e n t s i s g i v e n b y :
1842
1422
hCnn
hrkc .
Multi-Moded BPC
hC
CnR rh
rml 1log
2
11
1
22
mn
i m
i
r
mn
i m
i
n
r
Cn
t
C 1
1
10
10
101
101
T h e s y s t e m r e q u i r e t h e f o l l o w i n g c o m p o n e n t s :
i . )2( kn h y b r i d s ( e a c h h y b r i d i s c o u n t e d a s o n e c o m p o n e n t )
i i . )2( kn l o a d s ( e a c h l o a d i s c o u n t e d a s o n e c o m p o n e n t )
i i i . 2 rC T E 0 1 b e n d ( e a c h b e n d i s c o u n t e d a s o n e c o m p o n e n t )
i v .
1
22
hrC
h h i g h p o w e r h y b r i d s , ( c o u n t e d a s f o u r c o m p o n e n t s ) .
v .
1
22
hrC
s p l i t t e r s ( e a c h c o u n t e d a s t h r e e c o m p o n e n t s ) .
v i . mhr n
Ch
1
22 m o d e c o n v e r t e r s , ( e a c h i s c o u n t e d a s o n e c o m p o n e n t )
T h e t o t a l n u m b e r o f c o m p o n e n t s i s g i v e n b y
mmhm
rkc nhnn
Cnn 21842
21422
~7.4 cm Circular Waveguide
TE01 Mode Extractor(Power is Extracted Evenly Between Four Waveguides)
TE01
TE12 (Vertically Polarized)TE12 (Horizontally Polarized)
TE01
TE12 (Vertically Polarized)
TE01
TE01 Mode Extractor
Mode Launcher (Fed by Four Rectangular Waveguides)
TE21
TE21-TE01 Mode Converter
Klystrons
~ 6 mTE01 Mode Converter (Fed by Four Rectangular Waveguides)
TE12 to TE01 Mode Converter
~12.7 cm Circular Waveguide
TE01 Tap-Off
SLAC
KEK
Eight 75-megawatt klystrons
RF
e+ or e- A Cluster of 9 Multi-Moded DLDS Sections
RF Power Sources
A Single Multi-Moded Delay Line RF Distribution System
Accelerator Structures
Delay Lines
Relative Cost
Efficiency
Relative Cost
Efficiency
Waveguide Diameter (cm)
Waveguide Diameter (cm)
Single-moded System
Multi-Moded System
C o m p n en t D e ve lo p m e nt
S in g le -M o d e d D L D S M u lti-M o de d D L DS E xp erim e n ta l S e tu ps(S L E D -II)
A p p lica tion
O ve r-m o d ed C ircu la r W a ve gu id esC o m p o ne n ts B a se d o n the W ra p-A rou n d M o de C o n ve rte r
T a p e rs
O ve r-M od e d R e cta n gu la r W ave g u id e C o m p o ne n tsC o m p o ne n ts b a se d o n H -p lan e d iscon tinu ties
A d ia b a tic T ap e rs Fro m R e c ta ng u la r T o C ircu la r G u id esT E 2 0 -----> T E 0 1T E 3 0 -----> T E 1 2
O ve r-M o de d R e c tan g u la r W a ve gu id esM ixe d w ith O ve r-M o d e d C ircu la r w a veg u id es
T yp e
TE11 (Vertical)TE12 (Horizontal)TE01
TE11 (Vertical)TE11 (Horizontal)
TE11 (Vertical)TE01
TE01
TE01 Extractor
To Accelerator Structures
TE01 Launcher
Extractor Schematic Diagram
Mode Launcher (A set Of 4 hybrids)
~7.4 cm Circular Waveguide
Single-moded DLDS
Klystron
~53 m
~12.7 cm Circular Waveguide
Tantawi 8/97
Load
Wrap-Around Mode Converter for Tap-off, and extraction, tested to 320MW
Modular Launcher
TE11 Launcher TE01 LauncherTE01 Launcher
Both Polarizations of T
E 11
TE 01
TE 01
”
TE12-TE11 Mode Converter TE12-TE11 Mode ConverterTE11-TE01 Mode Converter
TE01 Mode Extractor5”
Instead of using a cutoff section to allow the extraction of the TE01 mode, one can use two mode converters cascaded together
A short circuit
Y0=1 Y0=1
Y0=1 Y0=1
Y0=1
Y0=1
Y0=1Y0=1
5
1
5
2
5
4
5
25
2
5
1
5
2
5
45
4
5
2
5
1
5
25
2
5
4
5
2
5
1
jj
jj
jj
jj
S
4/
4/
Port 1
Port 2
Port 3
Port 4
If a signal is injected in port 1, it will all appear in port 3.
TE12-TE01 Mode Converter
TE01 Mode Extractor
Compact Mode Extractor
Compact Launcher
Mode Pre-launcher, for testing launchers. The output phase of the four-waveguide output is controlled by the choice between the two inputs
1.5”~7”
A bend based on transition from an over-moded rectangular waveguide to a circular waveguide
TIMING
Because the rf power is being injected at different times into different modes that have different group velocities, one must pay a special attention to timing. The set of equation that need to be satisfied so that the each accelerator structure set get an rf pulse for a duration at the appropriate time are:
(1)
where L is the distance between accelerator structure sets, L1 is the distance between the launcher and first extractor, L2 is the distance between first and second extractor, L3 is the length of the delay line after the second extractor, vTE01 and vTE12 are the group velocities of the TE01 and TE12 modes respectively, and through are the delays due to the transmission of power from the main rf delay line system to the accelerator structure sets, i.e., the delay through and after the extractors.There are several choices for the lengths L, L1 through L3, and through that satisfy the above set of equations. An attractive choice is to set L1 through L3 equal to L, == and
(2)
This would lead to a fairly symmetric system.
);11
()()(
),11
()()(
),()(
0112234
01
3
0112123
01
2
1201
1
TETETE
TETETE
TE
vvL
c
L
v
L
vvL
c
L
v
L
c
L
v
L
)11
(0112
12TETE vv
L
LAUNCHER
Several ideas for the launcher have been proposed (8-9). In all of them a fundamental property of the launcher has been preserved: the launcher has only four inputs and the launcher has to launch four and only four modes. If this is preserved and the launcher is matched for all four different input conditions, because of unitarity and reciprocity the scattering matrix representing the launcher has to take the following form:
(3)
This form forces the isolation between inputs; i.e., if one of the four power supplies drops out or fails, the rest of the power supplies will not receive any reflected power.
00002/12/12/12/100002/12/12/12/100002/12/12/12/100002/12/12/12/12/12/12/12/100002/12/12/12/10000
2/12/12/12/100002/12/12/12/10000
S
Advanced Concepts
• Distributed Elements
• Circulators
• Switches
Summary• DLDS concepts are well understood
• Components based on wrap-around mode converters are being build and tested
• Devices based on Rectangular to Circular transitions are being designed
• High power experimental setups are being prepared
top related