U.S. patent application number 16/068268 was filed with the patent office on 2019-01-17 for plasma diagnosis system using multiple-reciprocating-path thompson scattering.
This patent application is currently assigned to INDUSTRY-UNIVERSITY COOPERATION FOUNDATION SOGANG UNIVERSITY. The applicant listed for this patent is INDUSTRY-UNIVERSITY COOPERATION FOUNDATION SOGANG UNIVERSITY. Invention is credited to Wha-Keun AHN, Kyu Man CHO, June Gyu PARK, Seung Hyun YOON.
Application Number | 20190019584 16/068268 |
Document ID | / |
Family ID | 56713563 |
Filed Date | 2019-01-17 |
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United States Patent
Application |
20190019584 |
Kind Code |
A1 |
CHO; Kyu Man ; et
al. |
January 17, 2019 |
PLASMA DIAGNOSIS SYSTEM USING MULTIPLE-RECIPROCATING-PATH THOMPSON
SCATTERING
Abstract
Provided is a plasma diagnosis system using
multiple-reciprocating-path Thompson scattering. The plasma
diagnosis system includes: alight source which supplies pulsed
laser beams; an optical system which sequentially supplies a pulsed
laser beam in a vertical polarization state and a pulsed laser beam
in a horizontal polarization state; a collection optic system which
measures a first collection signal scattered from the plasma when
the pulsed laser beam in the vertical polarization state is focused
and measures a second collection signal scattered from the plasma
when the pulsed laser beam in the horizontal polarization state is
focused; and a controller which measures a Thomson scattering
signal for the plasma by using the first and second collection
signals measured by the collection optic system, and the second
collection signal is a background scattering noise signal.
Inventors: |
CHO; Kyu Man; (Seoul,
KR) ; PARK; June Gyu; (Seoul, KR) ; YOON;
Seung Hyun; (Seoul, KR) ; AHN; Wha-Keun;
(Andong-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
INDUSTRY-UNIVERSITY COOPERATION FOUNDATION SOGANG
UNIVERSITY |
Seoul |
|
KR |
|
|
Assignee: |
INDUSTRY-UNIVERSITY COOPERATION
FOUNDATION SOGANG UNIVERSITY
Seoul
KR
|
Family ID: |
56713563 |
Appl. No.: |
16/068268 |
Filed: |
April 15, 2016 |
PCT Filed: |
April 15, 2016 |
PCT NO: |
PCT/KR2016/003953 |
371 Date: |
July 5, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G01J 3/02 20130101; Y02E
30/10 20130101; G21K 1/10 20130101; G21B 1/057 20130101; Y02E
30/122 20130101; G02B 27/10 20130101; G21B 1/23 20130101; G02B
27/283 20130101 |
International
Class: |
G21B 1/23 20060101
G21B001/23; G02B 27/28 20060101 G02B027/28; G21B 1/05 20060101
G21B001/05; G21K 1/10 20060101 G21K001/10 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 8, 2016 |
KR |
10-2016-0002627 |
Claims
1. A plasma diagnosis system using multiple-reciprocating-path
Thomson scattering, comprising: a light source which supplies
pulsed laser beams having predetermined polarization and
wavelength; an optical system which sequentially supplies a pulsed
laser beam in a vertical polarization state and a pulsed laser beam
in a horizontal polarization state by using the pulsed laser beams
supplied from the light source; a collection optic system which
measures a first collection signal scattered from the plasma when
the pulsed laser beam in the vertical polarization state supplied
from the optical system is focused and measures a second collection
signal scattered from the plasma when the pulsed laser beam in the
horizontal polarization state supplied from the optical system is
focused; and a controller which measures a Thomson scattering
signal for the plasma by using the first and second collection
signals measured by the collection optic system, wherein the first
collection signal is a signal in which a Thomson scattering signal
and a background scattering noise signal are mixed, and the second
collection signal is a background scattering noise signal.
2. The plasma diagnosis system according to claim 1, wherein the
optical system includes: a polarizing beam splitter (PBS) which is
disposed on an optical path of the pulsed laser beam supplied from
the light source; a first reflecting mirror which supplies the
pulsed laser beams reflected from the PBS back to the PBS; a
Faraday rotator which is disposed on the optical path of the pulsed
laser beam passing through the PBS and rotates the polarization
state by 45 degrees and outputs the pulsed laser beam; a focusing
lens which focuses the pulsed laser beam supplied from the Faraday
rotator on the plasma; and a second reflecting mirror which
reflects and supplies the focused pulsed laser beam back to the
focusing lens, and wherein the pulsed laser beam in the vertical
polarization state and the pulsed laser beam in the horizontal
polarization state are sequentially supplied to the plasma.
3. The plasma diagnosis system according to claim 1, further
comprising an optical isolator between the light source and the
optical system, and wherein the optical isolator causes the pulsed
laser beam supplied from the light source to propagate to the
optical system but prevents the beam output from the optical system
from entering the light source.
4. The plasma diagnosis system according to claim 1, further
comprising a trigger module which generates and outputs trigger
signals when the pulsed laser beams in the horizontal polarization
state and the pulsed laser beams in the vertical polarization state
are supplied from the optical system, respectively, wherein the
collection optic system is driven according to the trigger signals
output from the trigger module.
5. The plasma diagnosis system according to claim 4, wherein the
trigger module is disposed between the light source and the optical
system or at an arbitrary position of the optical system and
generates and outputs the trigger signal when detecting that the
pulsed laser beam is supplied from the light source to the optical
system, detecting that the pulsed laser beam is supplied from the
optical system to the plasma, or detecting that the pulsed laser
beam is supplied at an arbitrary position of the optical
system.
6. The plasma diagnosis system according to claim 1, wherein the
optical system focuses the pulsed laser beam into the plasma, the
collection optic system collects and measures scattered optical
signals in the plasma, and the controller measures and supplies the
Thomson scattering signal in the plasma.
7. The plasma diagnosis system according to claim 1, being applied
to a plasma apparatus in which temperature and density of electrons
are required to be measured.
Description
TECHNICAL FIELD
[0001] The present invention relates to a plasma diagnosis system
using Thomson scattering, and more particularly, a plasma diagnosis
system using multiple-reciprocating-path Thompson scattering
capable of measuring an accurate Thomson scattering signal by
measuring a Thomson scattering signal and a background scattering
noise signal in plasma by using an optical system configured to
rotate polarization by 90 degrees according to the number of times
of reciprocating propagation and removing the background scattering
noise signal.
BACKGROUND ART
[0002] In tokamak-type nuclear fusion, typically, deuterium atoms
and tritium atoms are heated up to so high temperature to generate
a plasma state in which ionized atomic nuclei and electrons have
free mobility, and the plasma is confined by using a strong
toroidal magnetic field, so that the nuclei overcome Coulomb force
and come close enough to cause fusion reaction at sufficiently high
temperature. In order to stably operate and control this
high-temperature, high-density plasma state, it is necessary to
know the temperature and density of the plasma, and thus, accurate
measurement thereof is required. As a result of this request,
various types of plasma diagnosis apparatuses have been developed
and used. As one of the plasma diagnosis apparatuses, there is a
diagnosis apparatus using Thomson scattering, which is an essential
diagnosis apparatus for measuring temperature and density of
electrons.
[0003] FIG. 1 is a configuration diagram schematically illustrating
a diagnosis apparatus using Thompson scattering in the related art
for diagnosing a state of plasma in a tokamak of a nuclear fusion
reactor.
[0004] Referring to FIG. 1, a diagnosis apparatus 1 using Thomson
scattering in the related art for diagnosing a state of plasma in a
tokamak 5 of a nuclear fusion reactor includes a light source which
outputs a strong pulsed laser beam polarized in a vertical
direction, an optical system 110 which focuses the laser beam in
the vertical polarization state into a plasma in the TOKAMAK, a
laser beam dump 120 which is mounted outside the tokamak and
absorbs and removes the laser beam emitted from the tokamak, and a
collection optic system 130 which collects the light scattered by
the laser beam.
[0005] More specifically, in order to measure the temperature and
density of electrons in the plasma, the above-described diagnosis
apparatus 1 using Thomson scattering focuses a laser pulse with a
single wavelength (1064 nm) having a strong electric field
intensity from the outside of the tokamak 5 into the plasma-filled
tokamak by using the light source 100 and the optical system 110.
The nuclei and electrons constituting the plasma are vibrated in
the polarization direction of the electric field of the laser beam
according to a temporal change of the strong unidirectional
electric field strength (polarized light) of the focused laser
beam, and a light beam with the same frequency as the incident
laser beam is emitted and is subjected to Thompson scattering. In
this case, the light is not subjected to Thomson scattering in the
direction parallel to the polarization direction of the laser beam.
Therefore, in the case where the polarization of the laser beam
incident on the cross section of the tokamak in FIG. 1 is
perpendicular to this cross section, scattered light is emitted in
the direction of collection optic system, so that the scattered
light can be received by the collection optic system. On the
contrary, in the case where the laser beam is horizontally
polarized with respect to the cross section of tokamak in FIG. 1,
no Thomson scattered light is emitted toward the collection optic
system, so that there is no Thomson scattered light received by the
collection optic system.
[0006] On the other hand, since the plasmas are moving fast, the
scattered light has a Doppler shift in wavelength due to the
Doppler effect. Therefore, the diagnosis apparatus using Thomson
scattering can acquire the temperature of electrons in the plasma
by measuring the wavelength shift due to the Doppler effect and can
also acquire the density of electrons according to the intensity of
light to be measured. That is, if signals of the Thomson scattered
light in the plasma are accurately measured, the temperature and
density of the plasma can be accurately acquired.
[0007] However, there exist the light beams that are reflected by
incomplete optical parts to be incident on the tokamak and the
light beams that are scattered multiple times by wall surfaces of
the tokamak and the like, and these light beams are called stray
light.
[0008] As the background noise caused by the stray light is
included in the Thomson scattering signal measured by the diagnosis
apparatus using Thomson scattering in the related art, there is a
problem in that the accuracy of the measured Thompson scattering
signal is lowered.
SUMMARY OF THE INVENTION
Technical Problem
[0009] In order to solve the problems described above, the present
invention is to provide a plasma diagnosis system using a
multiple-reciprocating-path Thompson scattering system capable of
measuring an accurate Thomson scattering signal from which a
background scattering noise signal is removed by using an optical
system.
Solution to Problems
[0010] According to an aspect of the present invention, there is
provided a plasma diagnosis system using Thomson scattering,
including: a light source which supplies pulsed laser beams having
predetermined polarization and wavelength; an optical system which
sequentially supplies a pulsed laser beam in a vertical
polarization state and a pulsed laser beam in a horizontal
polarization state by using the pulsed laser beams supplied from
the light source; a collection optic system which measures a first
collection signal scattered from the plasma when the pulsed laser
beam in the vertical polarization state supplied from the optical
system is focused and measures a second collection signal scattered
from the plasma when the pulsed laser beam in the horizontal
polarization state supplied from the optical system is focused; and
a controller which measures a Thomson scattering signal for the
plasma by using the first and second collection signals measured by
the collection optic system, wherein the first collection signal is
a signal in which a Thomson scattering signal and a background
scattering noise signal are mixed, and the second collection signal
is a background scattering noise signal.
[0011] Preferably, in the plasma diagnosis system using Thomson
scattering according to the above aspect, the optical system may
include: a polarizing beam splitter which is disposed on an optical
path of the pulsed laser beam supplied from the light source; a
first reflecting mirror which supplies the pulsed laser beams
reflected from the polarizing beam splitter back to the polarizing
beam splitter; a Faraday rotator which is disposed on the optical
path of the pulsed laser beam passing through the polarizing beam
splitter and rotates the polarization state by 45 degrees and
outputs the pulsed laser beam; a focusing lens which focuses the
pulsed laser beam supplied from the Faraday rotator on the plasma;
and a second reflecting mirror which reflects and supplies the
focused pulsed laser beam back to the focusing lens, and the pulsed
laser beam in the vertical polarization state and the pulsed laser
beam in the horizontal polarization state may be sequentially
supplied to the plasma.
[0012] Preferably, in the plasma diagnosis system using Thomson
scattering according to the above aspect, the Thomson signals
measured during the time when the vertically polarized pulses are
reciprocated may be synchronized and added, so that it is possible
to improve a signal-to-noise ratio.
[0013] Preferably, in the plasma diagnosis system using Thomson
scattering according to the above aspect, a half wave plate may be
disposed between the light source and the optical system.
[0014] Preferably, the plasma diagnosis system using Thomson
scattering according to the above aspect, may further include a
trigger module which generates and outputs trigger signals when the
pulsed laser beams in the horizontal polarization state and the
pulsed laser beams in the vertical polarization state are supplied
from the optical system, respectively, wherein the collection optic
system is driven according to the trigger signals output from the
trigger module,
[0015] More preferably, the trigger module may be disposed between
the light source and the optical system or at an arbitrary position
of the optical system and generates and outputs the trigger signal
when detecting that the pulsed laser beam is supplied from the
light source to the optical system, detecting that the pulsed laser
beam is supplied from the optical system to the plasma, or
detecting that the pulsed laser beam is supplied at an arbitrary
position of the optical system.
[0016] Preferably, the plasma diagnosis system using Thomson
scattering according to the above aspect may be applied to a
tokamak-type nuclear fusion reactor, wherein he optical system
focuses a pulsed laser beam into a tokamak, the collection optic
system collects scattered optical signals in the tokamak and
measures the scattered optical signals for each wavelength band by
using a polychrometer, and the controller measures and supplies a
Thomson scattering signal in the tokamak.
Effects of the Invention
[0017] The multiple-path plasma diagnosis system according to the
present invention sequentially supplies a pulsed laser beam in a
vertical polarization state and a pulsed laser beam in a horizontal
polarization state to a tokamak to be focused through multiple
reciprocating paths, so that it is possible to measure and supply a
Thomson scattering signal from which a background scattering noise
signal is removed.
BRIEF DESCRIPTION OF DRAWINGS
[0018] FIG. 1 is a configuration diagram schematically illustrating
a diagnosis apparatus using single-path Thompson scattering in the
related art for diagnosing a state of plasma in a tokamak of a
nuclear fusion reactor.
[0019] FIG. 2 is a configuration diagram schematically illustrating
a plasma diagnosis system using multiple-reciprocating-path Thomson
scattering according to a preferred embodiment of the present
invention.
[0020] FIG. 3 is a diagram illustrating a polarization state of a
pulsed laser beam in each stage in the plasma diagnosis system
using multiple-reciprocating-path Thomson scattering according to
the preferred embodiment of the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
[0021] In a plasma diagnosis system using Thomson scattering
according to the present invention, a pulsed laser beam in a
vertical polarization state and a pulsed laser beam in a horizontal
polarization state are sequentially supplied into a tokamak in a
nuclear fusion reactor through multiple reciprocating paths, and
scattering signals in the tokamak are measured, so that it is
possible to accurately measure a Thomson scattering signal from
which a background scattering noise signal is removed.
[0022] Hereinafter, a structure and operation of a plasma diagnosis
system using Thompson scattering according to a preferred
embodiment of the pre sent invention will be described in detail
with reference to the accompanying drawings.
[0023] FIG. 2 is a block diagram schematically illustrating a
plasma diagnosis system using multiple-reciprocating-path Thompson
scattering according to a preferred embodiment of the present
invention.
[0024] Referring to FIG. 2, a plasma diagnosis system 2 according
to the present invention is installed outside a tokamak 5 of a
nuclear fusion reactor and includes a light source 200, an optical
system 220 which sequentially supplies a vertically-polarized
pulsed laser beam and a horizontally-polarized pulsed laser bam to
the tokamak, a collection optic system 230 which collects scattered
light in the tokamak, a trigger module 240, and a controller
250.
[0025] The light source 200 outputs a pulsed laser beam in a
horizontal polarization state with a single wavelength of 1064 nm
and a strong electric field intensity.
[0026] The first half wave plate (HWP) 214 is disposed on the
optical path of the pulsed laser beam output from the light source
to select and maintain the polarization state of the propagating
pulsed laser beam.
[0027] The optical system 220 is provided between the light source
and the tokamak 5 to sequentially supply a pulsed laser beam in a
vertical polarization state and a pulsed laser beam in a horizontal
polarization state to the tokamak.
[0028] The optical system 220 includes a polarizing beam splitter
(PBS) 221 disposed on the optical path of the pulsed laser beam
supplied from the light source, a Faraday rotator (FR) 222, a
second half wave plate (HWP) 224, and a focusing lens 226 disposed
on the optical path of the pulsed laser beam passing through the
PBS, a second reflecting mirror 227 for reflecting the beam focused
by the focusing lens 226 and supplying the beam back to the
focusing lens, and a first reflecting mirror 229 disposed on a
reflecting path of the PBS.
[0029] The second reflecting mirror uses a concave lens to focus
the beam back to the position of Thompson scattering, and the first
reflecting mirror uses a convex lens to collimate the reflected
light.
[0030] The polarizing beam splitter (PBS) 221 transmits the beam in
the horizontal polarization state and reflects the beam in the
vertical polarization state.
[0031] The Faraday rotator 222, the second half wave plate 224, and
the focusing lens 226 are sequentially disposed on the optical path
of the pulsed laser beam passing through the PBS 220. The Faraday
rotator 222 rotates the polarization state of the pulsed laser beam
passing through the PBS 221 by 45 degrees and outputs the pulsed
laser beam, and the second half wave plate 224 rotates the beam
output from the Faraday rotator 222 by 45 degrees, so that the
pulsed laser beams in the horizontal polarization state are in the
vertical polarization state by the Faraday rotator 222 and the
second half wave plate 224. The first half wave plate 214 may be
omitted in the case where the polarization from the laser beam
source is in a perfectly horizontal polarization state. In some
cases, in principle, the second half wave plate 224 may be omitted
according to the position of a Thomson scattering collection unit.
The focusing lens 226 focuses the pulsed laser beam in the vertical
polarization state on a predetermined position in the tokamak in
the nuclear fusion reactor. When the pulsed laser beam is focused
into the tokamak by the focusing lens, the first Thomson scattering
is strongly generated in the direction of the collection optic
system. As a result, the first-1 collection signal, in which the
background scattering noise signal and the Thomson scattering
signal are mixed is collected by the collection optic system 230
and is transmitted to a polychrometer, by which the collection
signal is is measured for each wavelength band.
[0032] The second reflecting mirror 227 may be installed inside or
outside the tokamak and reflects the beam passing through the
tokamak back to the focusing lens. In this stage, the collection
optic system measures the first-2 collection signal in which the
background scattering noise signal and the Thomson scattering
signal are mixed.
[0033] The first reflecting mirror 229 is disposed in the
reflecting path of the PBS 221. The pulsed laser beam in the
vertical polarization state reflected from the PBS propagates to be
reflected by the first reflecting mirror 229 and is incident on the
PBS again.
[0034] The optical system 220 having the above-described
configuration sequentially supplies the pulsed laser beam in the
vertical polarization state and the pulsed laser beam in the
horizontal polarization state into the tokamak in the nuclear
fusion reactor.
[0035] The collection optic system 230 collects the beam scattered
from the tokamak to measure the intensity of the beam. The
collection optic system collects the beams according to the trigger
signal of the trigger module and supplies collection signals to the
controller.
[0036] The trigger module 240 generates the trigger signals and
outputs the trigger signals to the collection optic system and/or
the controller when the pulsed laser beam in the horizontal
polarization state and the pulsed laser beam in the vertical
polarization state are supplied from the optical system. The
trigger module may detect an extra laser beam signal transmitted
through a folding mirror disposed at a trigger point set between
the light source and the optical system or at an arbitrary position
of the optical system to use the extra laser beam signal as a
trigger signal.
[0037] The collection optic system is driven according to the
trigger signal output from the trigger module to collect light
scattered in the tokamak and supply the scattered light.
[0038] The controller 250 measures a Thomson scattering signal with
no background scattering noise signal by using the first and second
collection signals supplied from the collection optic system and
supplies the Thomson scattering signal. More specifically, the
controller allows Thomson scattering to be generated from the
plasma in the tokamak by the pulsed laser beam in the vertical
polarization state of the optical system and measures the first
collection signal in which the Thomson scattering signal and the
background scattering noise signal are mixed. In addition, the
controller allows Thomson scattering not to be generated from the
plasma in the tokamak by the pulsed laser beam in the horizontal
polarization state of the optical system and measures the second
collection signal configured with only the background scattering
noise signal. Therefore, the controller can accurately measure only
the pure Thomson scattering signal by removing the second
collection signal configured with only the background scattering
noise signal from the first collection signal in which the Thomson
scattering signal and the background scattering noise signal are
mixed.
[0039] Hereinafter, the operation of the plasma diagnosis system
using multiple-reciprocating-path Thompson scattering having the
above-described configuration according to the preferred embodiment
of the present invention will be described in detail with reference
to FIG. 3.
[0040] FIG. 3 is a diagram illustrating a polarization state of the
pulsed laser beam in each stage in the plasma diagnosis system
using multiple-reciprocating-path Thompson scattering according to
the preferred embodiment of the present invention.
[0041] Referring to FIG. 3, when a pulsed laser beam in a
horizontal polarization state is output and supplied from the light
source, in the first forward stage, the pulsed laser beam passes
through the PBS 221, passes through the FR 222 to be rotated by 45
degrees, and is rotated by 45 degrees again by the second HWP 224,
so that the pulsed laser beam is converted to be in the vertical
polarization state. When the pulsed laser beam in the vertical
polarization state is focused on a predetermined position inside
the tokamak, the first Thomson scattering is strongly generated in
the direction of the collection optic system 230. As a result, the
collection optic system measures the first-1 collection signal in
which the background scattering noise signal and the Thomson
scattering signal are mixed.
[0042] Next, the beam focused into the tokamak propagates after
Thompson scattering and is reflected by the second reflecting
mirror 227, and the first backward stage proceeds. In the first
backward stage, as the pulsed laser beam is focused into the
tokamak, the second Thomson scattering is generated. The collection
optic system measures the second first-2 collection signal in which
the background scattering noise signal and the Thomson scattering
signal are mixed due to the second Thompson scattering.
[0043] Next, in the first backward stage, the pulsed laser beam in
the vertical polarization state passing through the tokamak passes
through the second HWP 224 and is rotated by 45 degrees in the
backward direction by 45 degrees, and returns to the original state
and as the beam is rotated by 45 degrees by the FR 222 again, so
that the pulsed laser beam is in the vertical polarization
state.
[0044] The pulsed laser beam in the vertical polarization state is
reflected by the PBS 221 and propagates to the first reflecting
mirror 229.
[0045] The pulsed laser beam in the vertical polarization state
reflected by the first reflecting mirror is incident on the PBS 221
again and then reflected.
[0046] Next, in the second forward stage, the pulsed laser beam in
the vertical polarization state incident on the PBS from the first
reflecting mirror is reflected by the PBS, passes through the FR
222, and is rotated by 45 degrees. The pulsed laser beam is
converted to be in the horizontal polarization state by the second
HWP 224.
[0047] As the pulsed laser beam in the horizontal polarization
state is focused inside the tokamak, Thomson scattering is not
generated in the direction of the collection optic system 230, and
the collection optic system measures the second-1 collection signal
configured with only the background scattering noise signal.
[0048] Next, the beam focused into the tokamak propagates and is
reflected by the second reflecting mirror 227, and the second
backward stage proceeds. In the second backward stage, the pulsed
laser beam in the horizontal polarization state are focused again
inside the tokamak and propagate to the focusing lens with no
Thomson scattering in the direction of the collection optic system
230. At this time, the collection optic system measures the
second-2 collection signal configured with only the background
scattering noise signal.
[0049] The controller receives the first-1 and first-2 collection
signals in which the background scattering noise signal and the
Thomson scattering signal are mixed from the collection optic
system and receives the second-1 and second-2 collection signals
configured with only the background scattering noise signal, so
that it is possible to accurately measure only the Thomson
scattering signal by using these collection signals.
[0050] As described above, the plasma diagnosis system using the
multiple-reciprocating-path Thomson scattering according to the
present invention can accurately measure the Thomson scattering
signal.
[0051] On the other hand, the plasma diagnosis system according to
the present invention can be applied to a tokamak-type nuclear
fusion reactor. In this case, the optical system focuses the pulsed
laser beams into the tokamak, the collection optic system collects
scattered optical signals in the tokamak, and the controller
measures the Thomson scattering signal in the tokamak.
[0052] While the present invention has been particularly
illustrated and described with reference to exemplary embodiments
thereof, it should be understood by the skilled in the art that the
invention is not limited to the disclosed embodiments, but various
modifications and applications not illustrated in the above
description can be made without departing from the spirit of the
invention. In addition, differences relating to the modifications
and applications should be construed as being included within the
scope of the invention as set forth in the appended claims.
INDUSTRIAL APPLICABILITY
[0053] The plasma diagnosis system according to the present
invention can be used variously in apparatuses requiring
measurement of the temperature and density of plasma, and in
particular, can be used to diagnose the state of plasma inside a
tokamak-type nuclear fusion reactor.
* * * * *