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PROGRESS IN 2005-2006 IN THE PROJECT OF THE HIGH FIELD SIDE REFLECTOMETRY SYSTEM FOR THE MAIN PLASMA IN ITER. V. A. Vershkov , D. A. Shelukhin, A. O. Urazbaev, V.A. Zhuravlev NFI FSI RRC “Kurchatov Institute”, 123182, Moscow, Russian Federation. - PowerPoint PPT Presentation
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PROGRESS IN 2005-2006 IN THE PROJECT OF THE HIGH FIELD SIDE REFLECTOMETRY SYSTEM FOR THE MAIN PLASMA IN ITER
V. A. Vershkov, D. A. Shelukhin, A. O. Urazbaev, V.A. Zhuravlev
NFI FSI RRC “Kurchatov Institute”, 123182, Moscow, Russian Federation
System characteristics requirementsstandard discharge scenario (Scen 2)
• It is possible to work on the high field side with: – Ordinary wave frequencies 15 - 127 GHz
– Extraodinary frequencies 8 – 78 GHz
4 5 6 7 80
50
100
150
200
250
300
54
3
2
1
Freq
uenc
y [G
Hz]
Radius [m]
1 – extraordinary wave (low frequency cut off)
2 – ordinary wave
3 – electro cyclotron frequency
4 – extraordinary wave (high frequency cut off)
5 – double electron cyclotron frequency
PROGRESS IN HFS ITER REFLECTOMETRY UP TO 2006.
In 2005 the following works have been carried out:
1. The final version of the waveguides routes from antenna to the door to gallery were designed in form of CATIA models.
2. The works on construction of the laboratory test facility were continued. In particular the moke up of the two blanket modules were made and the optimized bends were manufacured.
3. The official cooperation between Kurchatov Institute and Institute of Applied Physics in Nijnii Novgorod started since June
2004. The goals - optimization of the bends and vacuum window.
4. Modification of 2D full-wave program for the Xl mode was in progress in 2005. This will increase it capabilities in calculation of propagation of Xl mode in turbulent plasma.
5. HFS reflectometry was recently installed in T-10 and tested on the turbulence measurements.
6. Neutron fluxes were estimated over the guide route and first 3D temperature estimations of the antenna heating were done
7. Semiconductor sweeeping frequency GANNs generators were purchased and tested in T-10.
8. The sweeping power supply was build and tested in T-10.
Schematics of combined horn/mirror antenna
Outline of the waveguide transmission line
The full-scale prototype of blanket section consisting of 2 modules with the gap in toroidal direction for test of passage of microwaves.
Antennas prototypes are settled in the gap (right foto)
Hyperbolic secant R0=50 mm Req=58 mm
Xl mode O mode
Hyperbolic secant R0=75 mm Req=87 mm
Xl mode O mode
Hyperbolic secant R0=100 mm Req=116 mm
Xl mode O mode
90 degree hyperbolic secant. What R is appropriate??R0(mm) A(mm) B(mm) C(mm)
50 116.05 116.05 52.81
75 174.08 174.08 79.22
100 232.11 232.11 105.62
125 290.13 290.13 132.03
00
95.1
r
zchrR
RUSSIAN RESEARCH CENTER “KURCHATOV INSTITUTE”
120 130 140 150 160 170 1800
20
40
60
80
100
120
140
XU
XL
aval
able
fr
equ
enci
es
Fre
qu
ency
[G
Hz]
Major radius [cm]
HFS reflectometry system in THFS reflectometry system in T--1010
• HFS reflectometry system was recently installed in T-10
• Minimal frequency restricted by waveguides is 14 GHz
• The XL frequency range for the typical T-10 discharges varies from 14 to 65 GHz (close to ITER)
RUSSIAN RESEARCH CENTER “KURCHATOV INSTITUTE”
HFS reflectometry system in T-10HFS reflectometry system in T-10
• First spectra from HFS Xl-mode reflectometry OH T-10 discharge• Reflection at about a/2 • Clearly seen poloidal turbulence rotation and MHD modes• No Quasi-Coherent modes• Very low frequency to reach the core plasma.
-400 -200 0 200 4000.0
0.2
0.4
0.6
0
0
1
2C
oh
ere
ncy
Frequency [kHz]
= 6.26 s = 1.65·104 rad/s
Cro
ss-
ph
ase [
rad
]
-
F = 25.5 GHz ~ 0.5
BT = 2.4 T
ne = 2.6·1019 m-3
Am
pl. [
a.u
.]
RUSSIAN RESEARCH CENTER “KURCHATOV INSTITUTE”
HFS reflectometry system in T-10HFS reflectometry system in T-10
600 700 800 9000.0
0.2
0.4
0
2.0
2.5
E/E
Time [ms]
[ra
d]
ne
[1019
m-3] • High quality of the overall
phase tracking
• Extremely low relative level of the fluctuations of the total signal The typical value 0.15 – 0.2 with the saturation limit of 1.5.
• • It opens possibilities to
work without saturation in strongly heated plasmas.
• • Good tracking of the MHD
events (sawtooth pfase jumps)
580 590 600
0
5
10
740 750 760-1
0
1
[ra
d]
Time [ms]
-400 -200 0 200 4000,0
0,1
0,2Shot 42412t = 600 ms = 0.54
Signal Fourier spectra at the LFS & HFS side, normalized at the turbulence RMS amplitude
LFS, n/n
e=0.77 %
HFS, n/n
e=0.47 %
Y( n/n
e) [a
.u.]
Frequency [kHz]
Comparison of reflectometry fluctuation spectra from the top and HFS in OH plasma
Comparison of radial profiles of the reflectometry turbulence fluctuation level from the top and HFS in
OH and 1 MW ECRH
0,2 0,4 0,6 0,80,0
0,5
1,0
1,5
2,0
0,2 0,4 0,6 0,8
OH plasma LHS HFS
n/n
[%]
ECRH plasma
First experiments with the broad (28 – 32 GHz) fast (200s)
frequency scan at HFS in monostatic antenna
variant-1,5
-1,0
-0,5
0,0
0,5
1,0
899,6 899,8 900,0 900,2 900,4 900,6 900,8 901,0 901,2
-101
28
30
32
900,05 900,10 900,150,0
0,5
1,0
1,5
2,0
Time [ms]
Fre
qu
en
cy
[M
Hz]
Am
pli
tud
e [a
rb. u
n.] F
req
uen
cy [
GH
z]
Schematics of the designed primary wacuum window
VW was designed on the base of the ideas of paper of M. Petelin, W. Kasparek In Int. J.Electronics, 1991, Vol 71, # 5, 871 – 8732. The geometry and transmission was worked out during the contract of Kurchatov Institute with Nijnii Novgorod in 2005
Corrugated quartz vacuum window transmission for E parallel to the long waveguide side
1. VW was designed on the base of the ideas of paper Of M. Petelin, W. Kasparek In Int. J.Electronics, 1991,
Vol 71, # 5, 871 – 8732. The geometry and
transmission was worked out during the contract of Kurchatov Institute with Nijnii Novgorod in 2005
Corrugated vacuum window transmission for E perpendicular to the long waveguide side
1. VW was desined on the base of the ideas of paper Of M. Petelin, W. Kasparek In Int. J.Electronics, 1991,
Vol 71, # 5, 871 – 8732. The geometry and
transmission was worked out during the contract of Kurchatov Institute with Nijnii Novgorod in 2005
1. We made wide range of the 90 degree bends search in dimensions. We should choose the finite bend dimension, which is possible to use.What is the BIGGEST bend among 4 is appropriate? (This is also referred to 40 degree bend)
2. The small distance between waveguides make difficult to construct the horns. Is it possible to increase the distance between the waveguides by transferring some magnetics cables inside waveguides? Or to expand waveguides Just in vicinity of equatorial plane (less cabling?)
3. The minimal allowed gap between the blankets should be statedALL THIS QUESTIONS SHOULD BE SETTLED IN 2006