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[[File:Solar flare.png|420px|thumb|right|A prominence on the sun, an arc of plasma rising into the corona. Image credit: [http://sdo.gsfc.nasa.gov/ Solar Dynamics Observatory] (April, 2010)]]
Diagnostics are the eyes and ears of fusion reactors. They return vital parameters such as the temperature, the density, the impurity content, the magnetic field et cetera.  
Diagnostics are the eyes and ears of fusion reactors. They return vital parameters such as the temperature, the density, the impurity content, the magnetic field et cetera.  
Below you find a list of different diagnostics, together with their main measurement parameters.
A distinction can be made between ''active'' diagnostics (requiring the injection of light beams, particles, or probes and the observation of an induced effect), and ''passive'' diagnostics (based on the observation of radiation and particles emitted spontaneously by the plasma).
Below follows a list of different diagnostics, together with their main measurement parameters.


== Passive diagnostics ==


{| class="wikitable"  align="center" border="1"
!''Name'' !!''Abbreviation''!!''Measurement parameters''
|-
|Mirnov coils, pickup coils || - || Magnetic field components and fluctuations (outside plasma)
|-
|Flux loops || - || Magnetic field (outside plasma)
|-
|Electron Cyclotron Emission || ECE, ECEi || Electron temperature <math>T_e</math>, electron temperature fluctuations (turbulence) <math>\tilde{T}_e</math> (local)
|-
|Soft X-Ray Emission || SXR || A combination of electron temperature <math>T_e</math>, electron density <math>n_e</math>, and effective charge <math>Z_{eff}</math> (line integral)
|-
|Bolometry || - || Broad spectrum emission (line integral)
|-
|H<sub>&alpha;</sub> monitors|| - || Emission of specific H<sub>&alpha;</sub> radiation
|-
|Spectroscopy || - || Monitoring of [[impurities]], etc. (line integral)
|}
== Active diagnostics ==


{| class="wikitable"  align="center" border="1"
{| class="wikitable"  align="center" border="1"
!''Name'' !!''Abbreviation''!!''Measurement parameters''
!''Name'' !!''Abbreviation''!!''Measurement parameters''
|-
|-
|Thomson Scattering || TS || Electron temperature <math>T_e</math>, electron density <math>n_e</math>
|Thomson Scattering || TS || Electron temperature <math>T_e</math>, electron density <math>n_e</math> (local)
|-
|-
|Charge Exchange Recombination Spectroscopy || CXRS, CXS, CHERS, CER || Ion temperature <math>T_i</math>, toroidal and poloidal plasma rotation velocity <math>v_\phi</math>, <math>v_\theta</math>, impurity density <math>n_Z</math>
|Charge Exchange Recombination Spectroscopy || CXRS, CXS, CHERS, CER || Ion temperature <math>T_i</math>, toroidal and poloidal plasma rotation velocity <math>v_\phi</math>, <math>v_\theta</math>, impurity density <math>n_Z</math>
|-
|-
|Motional Stark Effect || MSE || Magnetic pitch angle <math>tan(\gamma) = B_\theta/B_\phi</math>
|Motional Stark Effect || MSE || Magnetic pitch angle <math>\tan(\gamma) = B_\theta/B_\phi</math>
|-
|Heavy Ion Beam Probe || HIBP || Electron density <math>n_e</math>, plasma potential <math>\phi</math> (local) <br>See [[TJ-II:Heavy Ion Beam Probe]]
|-
|Interferometry || - || Electron density <math>n_e</math> (line integral)
|-
|Polarimetry || - || Magnetic field pitch (line integral)
|-
|Reflectometry || - || Electron density <math>n_e</math> (local, fluctuations)
|-
|-
|Electron Cyclotron Emission || ECE, ECEi || Electron temperature <math>T_e</math>, electron temperature fluctuations (turbulence) <math>\tilde{T}_e</math>
|Langmuir probes || - || Ion saturation current, plasma potential, Mach number, etc. (local, fluctuations)
|-
|-
|Mirnov coils, pickup coils || - || magnetic field components and fluctuations (outside plasma)
|Diagnostic beams || - || Injection of Helium, Lithium, etc., and observation of emitted radiation (local, fluctuations)
|}
|}


A special bi-annual conference on fusion diagnostics is held in the U.S.: The [[Topical Conference on High Temperature Plasma Diagnostics]] (HTPD)
A special bi-annual conference on fusion diagnostics is held in the U.S.: The [[Topical Conference on High Temperature Plasma Diagnostics]] (HTPD)


[[Special:AllPages|List of all current pages]]
== References ==
* I.H. Hutchinson, ''Principles of Plasma Diagnostics'', Cambridge University Press; 2<sup>nd</sup> edition (2002) {{ISBN|978-0521803892}}

Latest revision as of 12:40, 26 January 2023

Diagnostics are the eyes and ears of fusion reactors. They return vital parameters such as the temperature, the density, the impurity content, the magnetic field et cetera. A distinction can be made between active diagnostics (requiring the injection of light beams, particles, or probes and the observation of an induced effect), and passive diagnostics (based on the observation of radiation and particles emitted spontaneously by the plasma). Below follows a list of different diagnostics, together with their main measurement parameters.

Passive diagnostics

Name Abbreviation Measurement parameters
Mirnov coils, pickup coils - Magnetic field components and fluctuations (outside plasma)
Flux loops - Magnetic field (outside plasma)
Electron Cyclotron Emission ECE, ECEi Electron temperature Te, electron temperature fluctuations (turbulence) T~e (local)
Soft X-Ray Emission SXR A combination of electron temperature Te, electron density ne, and effective charge Zeff (line integral)
Bolometry - Broad spectrum emission (line integral)
Hα monitors - Emission of specific Hα radiation
Spectroscopy - Monitoring of impurities, etc. (line integral)

Active diagnostics

Name Abbreviation Measurement parameters
Thomson Scattering TS Electron temperature Te, electron density ne (local)
Charge Exchange Recombination Spectroscopy CXRS, CXS, CHERS, CER Ion temperature Ti, toroidal and poloidal plasma rotation velocity vϕ, vθ, impurity density nZ
Motional Stark Effect MSE Magnetic pitch angle tan⁡(γ)=Bθ/Bϕ
Heavy Ion Beam Probe HIBP Electron density ne, plasma potential ϕ (local)
See TJ-II:Heavy Ion Beam Probe
Interferometry - Electron density ne (line integral)
Polarimetry - Magnetic field pitch (line integral)
Reflectometry - Electron density ne (local, fluctuations)
Langmuir probes - Ion saturation current, plasma potential, Mach number, etc. (local, fluctuations)
Diagnostic beams - Injection of Helium, Lithium, etc., and observation of emitted radiation (local, fluctuations)

A special bi-annual conference on fusion diagnostics is held in the U.S.: The Topical Conference on High Temperature Plasma Diagnostics (HTPD)

References

  • I.H. Hutchinson, Principles of Plasma Diagnostics, Cambridge University Press; 2nd edition (2002) ISBN 978-0521803892
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