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In a world increasingly facing new challenges at the forefront of plasma scientific research and technological innovation, CNR and ISTP pledge progress and achieve an impact in the integration of research into societal practices and policy

WP-5: Neutral beams injectors in RFX-mod2

RESEARCH UNIT: ISTP-Padova
WP LEADER: MARCO BARBISAN

The objective of this work package is to enhance the diagnostic capability of the RFX experiment by improving the measurement of the ion temperature profile. This is accomplished by injecting energetic neutrals into the plasma using a Diagnostic Neutral Beam Injector (DNBI) to probe the core region. When the probing neutrals collide with the thermal hydrogen (or deuterium), they transfer an electron, making some of the bulk ions neutral via charge exchange. The new neutral component in the plasma has the same energy content as the bulk ions. By analyzing the radiation emitted by these atoms spectrally, collective flows and ion thermal temperature profiles can be measured in the plasma. 

GOALS

This work package comprises two main activities:

  • The refurbishment of a 50 keV, 100 kW Diagnostic Neutral Beam Injector (DNBI) to enhance its performance and reliability. This will involve upgrading the DNBI's components and subsystems, such as the high voltage transformer, the pumping system and the control system.
  • The procurement of advanced measurement instruments. One luminous visible spectrometer will be acquired for the partailly resolved measurement of the radiation induced by Charge Exchange processes. Additionally, one polarimeter will be obtained to perform Motional Stark Effect measurements, which can provide information on the magnetic field direction and strength. These new instruments will enable more precise measurements of plasma properties and facilitate deeper insights into the behavior of the experiment.

Background

It is crucial to have knowledge of the ion temperature gradient to characterize the underlying turbulence and estimate the frequency of Geo Acoustic Modes (GAMs), which are the high-frequency branch of the zonal flows. Furthermore, Charge Exchange Recombination Spectroscopy is the basis for Fast Ion D alpha detection. Furthermore, Neutral Particle Analyzers can intercept fast ions that have recombined into neutrals and escaped the magnetic confinement.

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CONTACTS

COMMUNICATION AND INFORMATION:
comunicazione@istp.cnr.it

WP leader:
marco.barbisan@igi.cnr.it

 

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