US2022013340A1PendingUtilityA1
Non-pertubative measurements of low and null magnetic field in high temperature plasmas
Est. expiryJun 3, 2036(~9.9 yrs left)· nominal 20-yr term from priority
H05H 1/11H05H 1/0025G21B 1/23G21B 1/05Y02E30/10G01R 33/032G01J 3/0224H01J 37/32669G21B 1/052
53
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Claims
Abstract
Systems and methods that facilitate non-pertubative measurements of low and null magnetic field in high temperature plasmas.
Claims
exact text as granted — not AI-modifiedWhat is claimed:
1 . A non-perturbative method of measuring radially varying axial magnetic fields in high-temperature plasmas, comprising:
collecting scattered light signals from illuminated plasma atoms within a Field-Reversed-Configuration (FRC) plasma, wherein the scattered light signals are collected in a viewing direction one of radially or axially to the FRC magnetic field; and determining the null magnetic field location of an the FRC magnetic field of the FRC plasma from the collected scattered light signals as a function of a linear polarization fraction, p L , of the collected scattered light signals, wherein the linear polarization fraction, p L , of a collected light signal being
p
L
=
1
1
+
4
H
2
when collected in a viewing direction axial to the FRC magnetic field, or
p
L
=
1
+
2
H
2
1
+
6
H
2
when collected in a viewing direction radial to the FRC magnetic field, wherein where H=ω p /A is the ratio Larmor frequency of bound electron and Einstein's coefficient or radiation rate of the ion.
2 . The method of claim 1 , further comprising:
collecting scattered light signals from illuminated plasma atoms within the FRC plasma, wherein the scattered light signals are collected in a viewing direction radially to the FRC magnetic field; determining first and second axial null magnetic field locations of the FRC magnetic field of the FRC plasma from the collected scattered light signals as a function of a linear polarization fraction, p L , of the collected scattered light signals, wherein the linear polarization fraction, p L , of a collected light signal being
p
L
=
1
+
2
H
2
1
+
6
H
2
;
and
measuring a distance between the first and second axial null magnetic field locations to produce a length of the FRC magnetic field.
3 . The method of claim 1 , further comprising:
collecting scattered light signals from illuminated plasma atoms within the FRC plasma, wherein the scattered light signals are collected in a viewing direction one of radially and axially to the FRC magnetic field; determining first and second axial null magnetic field locations of the FRC magnetic field of the FRC plasma from the collected scattered light signals as a function of a linear polarization fraction, p L , of the collected scattered light signals, wherein the linear polarization fraction, p L , of a collected light signal being
p
L
=
1
1
+
4
H
2
when collected in a viewing direction axial to the FRC magnetic field, or
p
L
=
1
+
2
H
2
1
+
6
H
2
when collected in a viewing direction radial to the FRC magnetic field; and
measuring a distance between the first and second axial null magnetic field locations to produce a length of the FRC magnetic field.
4 . The method of claim 1 , further comprising:
determining locations of the null magnetic field of the FRC magnetic field at two points along a diameter of the FRC plasma; calculating, using the locations of the null magnetic field, a radius and a center of the FRC plasma; and providing the radius and center to a feedback control system.
5 . The method of claim 4 , wherein the feedback control system controls a radial location and size of the FRC plasma by controlling the externally applied magnetic field.
6 . The method of claim 1 , wherein the step of collecting scattered light signals from plasma atoms comprising:
aligning a slit of a first spectropolarimeter in a viewing direction one of radially or axially to the FRC magnetic field of the FRC plasma; collecting scattered light signals from the illuminated plasma atoms within the FRC plasma through the slit; and determining the null magnetic field location of the FRC magnetic field of the FRC plasma from the collected scattered light signals as a function of the linear polarization fraction, p L , of the collected scattered light signals.
7 . The method of claim 1 , wherein the step of collecting scattered light signals from plasma atoms comprising:
simultaneously aligning first and second slits of first and second spectropolarimeters in a viewing direction one of radially or axially to the FRC magnetic field of the FRC plasma; collecting scattered light signals from illuminated plasma atoms within the FRC plasma through the first and second slits; determining a location of first and second axial null magnetic field locations of the FRC magnetic field from the collected scattered light signals as a function of the linear polarization fraction, p L , of the collected scattered light signals; and measuring a distance between the first and second axial null magnetic field locations to produce a length of the FRC magnetic field.
8 . The method of claim 1 , further comprising:
determining locations of the null magnetic field of the FRC magnetic field at two points along a diameter of the FRC plasma; calculating, using the locations of the null magnetic field, a radius and a center of the FRC plasma; and providing the radius and center to a feedback control system.
9 . The method of claim 8 , wherein the feedback control system controls a radial location and size of the FRC plasma by controlling the externally applied magnetic field.
10 . A system for non-perturbative measuring of radially varying axial magnetic fields in high-temperature field reversed configuration (FRC) plasmas, comprising:
a first spectro-polarimeter comprising a spectrometer having a fast imaging Charged Coupled Device (CCD) camera; wherein the spectrometer is configured to collect scattered light signals from illuminated plasma atoms within a FRC plasma in a viewing direction one of radially or axially to the FRC magnetic field; and, wherein a null magnetic field location of the FRC magnetic field of the FRC plasma is determinable from the collected scattered light signals as a function of a linear polarization fraction, p L , of the collected scattered light signals, wherein the linear polarization fraction, p L , of a collected light signal being
p
L
=
1
1
+
4
H
2
when collected in a viewing direction axial to the FRC magnetic field, or
p
L
=
1
+
2
H
2
1
+
6
H
2
when collected in a viewing direction radial to the FRC magnetic field, wherein H=ω p /A is the ratio Larmor frequency of bound electron and Einstein's coefficient or radiation rate of the ion, and
a plurality of slits each aligned to collect and image scattered light signals from illuminated plasma atoms.
11 . The system of claim 10 , further comprising:
a birefringent crystal to split the scattered light signals into orthogonal polarizations pairs of the scattered light signals; and a plurality of slits in the spectro-polarimeter, wherein each of the plurality of slits are aligned to collect and image pairs of the orthogonal polarized scattered light signals with the CCD; and wherein the CCD is further configured to determine the null magnetic field location of the FRC magnetic field of the FRC plasma from the collected scattered light signals as a function of a linear polarization fraction, p L , of the collected scattered light signals.
12 . The system of claim 10 , further configured to:
collect scattered light signals from illuminated plasma atoms within the FRC plasma, wherein the scattered light signals are collected in a viewing direction radially to the FRC magnetic field; determine first and second axial null magnetic field locations of the FRC magnetic field of the FRC plasma from the collected scattered light signals as a function of a linear polarization fraction, p L , of the collected scattered light signals, wherein the linear polarization fraction, p L , of a collected light signal being
p
L
=
1
+
2
H
2
1
+
6
H
2
;
and
measure a distance between the first and second axial null magnetic field locations to produce a length of the FRC magnetic field.
13 . The system of claim 10 , further configured to:
collecting scattered light signals from illuminated plasma atoms within the FRC plasma, wherein the scattered light signals are collected in a viewing direction one of radially and axially to the FRC magnetic field; determining first and second axial null magnetic field locations of the FRC magnetic field of the FRC plasma from the collected scattered light signals as a function of a linear polarization fraction, p L , of the collected scattered light signals, wherein the linear polarization fraction, p L , of a collected light signal being
p
L
=
1
1
+
4
H
2
when collected in a viewing direction axial to the FRC magnetic field, or
p
L
=
1
+
2
H
2
1
+
6
H
2
when collected in a viewing direction radial to the FRC magnetic field; and
measure a distance between the first and second axial null magnetic field locations to produce a length of the FRC magnetic field.
14 . The spectro-polarimeter of claim 10 , further configured to:
determine locations of the null magnetic field of the FRC magnetic field at two points along a diameter of the FRC plasma; calculate, using the locations of the null magnetic field, a radius and a center of the FRC plasma; and provide the radius and center to a feedback control system.
15 . The spectro-polarimeter of claim 14 , wherein the feedback control system controls a radial location and size of the FRC plasma by controlling the externally applied magnetic field.
16 . The system of claims 10 , further comprising:
a second spectro-polarimeter comprising a spectrometer having a fast imaging CCD camera; wherein the spectrometer is configured to collect scattered light signals from illuminated plasma atoms within the FRC plasma a viewing direction radially to the FRC magnetic field; and, wherein first and second null magnetic field locations adjacent the first and second opposing axial edges of the FRC magnetic field of the FRC plasma are determinable from the collected scattered light signals as a function of a linear polarization fraction, p L , of the collected scattered light signals, wherein the linear polarization fraction, p L , of a collected light signal being
p
L
=
1
+
2
H
2
1
+
6
H
2
.
17 . The system of claim 10 , further comprising:
second and third spectro-polarimeters each comprising a spectrometer having a fast imaging CCD camera; wherein each spectrometer of the second and third spectro-polarimeters is configured to collect scattered light signals from illuminated plasma atoms within the FRC plasma a viewing direction one of radially and axially to the FRC magnetic field; and, wherein first and second null magnetic field locations adjacent the first and second opposing axial edges of the FRC magnetic field of the FRC plasma are determinable from the collected scattered light signals as a function of a linear polarization fraction, p L , of the collected scattered light signals, wherein the linear polarization fraction, p L , of a collected light signal being
p
L
=
1
1
+
4
H
2
when collected in a viewing direction axial to the FRC magnetic field, or
p
L
=
1
+
2
H
2
1
+
6
H
2
when collected in a viewing direction radial to the FRC magnetic field.Join the waitlist — get patent alerts
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