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Second International Symposium on Space Terahertz Technology Page 501
1
10 15 20 25 30Distance above circuit, Fra
Fig. 2. Calculated beam current densities beforeand after circuit interception (scraped).
Fig
. 7.
The
mul
tiel
ectr
ode
lens
com
pens
ated
gun
for
the
fir
stex
peri
men
t w
ith
calc
ulat
ed e
lect
ron
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ecto
ries
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Com
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Equip
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ELECTRON PENCIL BEAMSCRAPED INTO A
SHEET BEAM
INTER-DIGITALBWO CIRCUIT
FABRICATED ONDIAMOND SUBSTRATE
Second International Symposium on Space Terahertz Technology Page 503
CONFIGURATION OF ELECTRON BEAM WITH RESPECT TO BWO CIRCUIT
Fig. 1. Configuration of the electron beamwith respect to the BWO circuit.
11.1
111
111
ALU
MIN
UM
ME
TA
LIZ
ED
CR
YS
TA
LLIN
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ET
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ME
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.0 u
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O2B
JUL
Y 1
3, 1
98
9
00u Fig
. 14. D
raw
ing o
f 200-2
50 G
HJz
backw
ard
-wave o
scil
lato
r in
terd
igit
al
line a
s use
d t
o m
ake c
ircuit
s.
2. 0 3.0
220 gr
0.5
0.01 . 0
200
180
Second International Symposium on Space Terahertz Technology Page 505
Voltage, kVFig. 19. Theoretical and experimental starting current for the aluminum
metalized crystalline quartz circuit shown in Fig. 14.
2802.0
-41). Relative Power
1.5 -4"" Frequency 260
ta4
240 C.:C.a 1.0
Voltage, kVFig. 20. Tuning curve and power output curve for the aluminum
metalized crystalline quartz circuit shown in Fig. 14.
LIN
EA
RS
LOT
AN
TE
NN
AB
OT
H E
ND
S
11.2
°
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ME
TA
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ED
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YS
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nrin
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Y 1
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9
Fig
. 23.
Dra
win
g o
f al
um
inu
m m
etal
ized
cry
stal
lin
e q
uar
tz c
ircu
itw
ith h
orn
an
ten
na
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try
ing
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tica
l ex
per
imen
t.
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ZED
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YS
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INE
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AR
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MM
X 5
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X .5
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TH E
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OT
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SS
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A/0
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g
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"
Fig
. 24.
Sch
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ic d
iag
ram
of
the
circ
uit
, le
ns,
an
d w
ind
ow
confi
gu
rati
on
fo
r th
e o
pti
cal
exp
erim
ent.
WO5C
JULY
13,
198
9
265 GHz
Design Point
\ Linear DispersionTheoretical Curve Et
----- 127,3 GHz
1
300
150
100
250
200
Page 508 Second International Symposium on Space Terahertz Technology
1 2 3
Beam Voltage, kV
Fig 25. Quartz substrate BWO frequency versus beam voltage.
-,,,und International Symposium on Space Te ahertz Technology Page 509
-200.0 1.0 2.0 3.0 4.0 5.0
Beam Voltage,kV
Fig. 26. Quartz sub3trateB0ou put.
11. 2
°
ALU
MIN
UM
ME
TA
L1Z
ED
2A D
IAM
ON
D10
MA
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MM
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TE
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OT
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ND
S. 8
00
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M
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T =
ME
TA
L T
HIC
KN
ES
S2.0
LIM
= E
TC
H D
EP
TH
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Fig
. 2
7.
Dra
win
g o
f al
um
inu
m m
eta
lize
d e
tch
ed d
iam
on
d c
ircu
it w
ith
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ered
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R
QU
AR
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LE
CT
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IAM
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INE
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TE
NN
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OT
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ila
S 20.2
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ICK
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SS
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H
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EM
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HE
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IND
OW
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ZE
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Fig
. 28. S
chem
ati
c d
iagra
m o
f th
e c
ircuit
, le
ns,
and w
indow
confi
gura
tion f
or
the d
iam
ond e
xperi
ment.
311.5 GHz
Page 572 Second International Symposium on Space Terahertz Technology
400
Tuning Band = 77.7%
Center Freq. = 224 GHz
Linear DispersionTheoretical Curve Fit
1003 4
Beam Voltage, kV
Fig. 29. Diamond substrate BWO tuning. Experimentalfrequency versus beam voltage.
6
Rela
tive P
ow
er,
(1
11
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Second International Symposium on Space Terahertz Technology Page 519
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