Bolometry

Bolometric field measurement

Bolometric detector
Bolometric detector

Bolometric detectors are the part of basic diagnostic of tokamak plasma. They measure the overall energy of incidental electromagnetic radiation. Next to the data on radiated power, they make possible to obtain spatial arrangement of radiation by placing more detectors together, so that they will scan the plasma radiation through narrow gap. This ensures the detailed spatial detecting of radiation development. The the adjustment of standard metallic bolometers is in milliseconds and thus it is not fast enough to monitor fast-paced changes in tokamak plasma (turbulences, instabilities). By using the fast data acquisition in combination with bolometers based on semiconductor diodes, it is possible to obtain the time-adjustment about one microsecond, which will allow very detailed monitoring of plasma development. The work with bolometers will introduce the students the basics of analysis of radiation losses on tokamak plasma. The visualisation of data will help to understand better the studied problematic and in several basic experiments the students will get the relations between major plasma parameters enlightened.

For this section, there have been submitted more in-detail information about work tasks of this section. Namely:

    <li>Monitoring of time development of overall radiation during the discharge. Monitoring the radiation profile and its changes. Discussion on topic local vs. integral measurement
<li>Influence of the <a href="/Tokamak/Coils/Stabilization/coils_stabilisation">magnetic stabilisation</a> change on the plasma radiation (its shape and location). Switching the magnetic stabilisation moves the plasmatic column up, down, left, right, and that will influence the signals of bolometers.
<li>Influence of the plasma density changes on overall radiation or on radiation profile changes. Injecting the hydrogen, while discharge lasts, changes the plasma density.
<li>Influence of the magnetic field and plasmatic current on overall radiation.
<li>Tomography or 2D radiation reconstruction.
<li>Fluctuations monitoring. By using the fast data acquisition the turbulences in plasma are apparent. Eliminating the background from data, visualisation, noise parts, correlation analysis.

The designted garants for this subsection are Mgr. Vladimír Weinzettl, Ph.D. and Edita Dufková.

Current status of the section

At this moment we are unable to give any further information considering this issue. For most up-to-date information, please contact the professional garant for this section - Mgr. Vladimír Weinzettl, Ph.D., Edita Dufková.

References