Measurement and Control of the Growth of Rotating Magnetic Islands by Electron Cyclotron Current Drive in a Tokamak

1997 ◽  
Vol 31 (3) ◽  
pp. 338-349 ◽  
Author(s):  
Sante Cirant ◽  
Gabriele D’Antona ◽  
Enzo Lazzaro ◽  
Gabriella Ramponi
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Magnetic Islands ◽  
And Control ◽  
Measurement And Control

Magnetic island suppression by electron cyclotron current drive as converse of a forced reconnection problem

2018 ◽  
Vol 84 (3) ◽  
Author(s):  
D. Grasso ◽  
D. Borgogno ◽  
L. Comisso ◽  
E. Lazzaro
Keyword(s):  
Robust Control ◽  
Control Strategy ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Magnetic Islands ◽  
Tearing Mode ◽  
Magnetic Island ◽  
Technical Approach ◽  
Physical Conditions ◽  
Secondary Instabilities

This paper addresses one aspect of the problem of the suppression of tearing mode magnetic islands by electron cyclotron current drive (ECCD) injection, formulating the problem as the converse of a forced reconnection problem. New physical conditions are discussed which should be considered in the technical approach towards a robust control strategy. Limits on the ECCD deposition are determined to avoid driving the system into regimes where secondary instabilities develop. Numerical simulations confirming the theory are also presented.

scholarly journals Open problems of magnetic island control by electron cyclotron current drive

2016 ◽  
Vol 82 (6) ◽  
Author(s):  
D. Grasso ◽  
E. Lazzaro ◽  
D. Borgogno ◽  
L. Comisso
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Small Scale ◽  
Magnetic Islands ◽  
Magnetic Island ◽  
Open Problems ◽  
Scale Structures ◽  
Key Aspects ◽  
Small Scale Structures ◽  
Open Issues

This paper reviews key aspects of the problem of magnetic islands control by electron cyclotron current drive in fusion devices. On the basis of the ordering of the basic spatial and time scales of the magnetic reconnection physics, we present the established results, highlighting some of the open issues posed by the small-scale structures that typically accompany the nonlinear evolution of the magnetic islands and constrain the effect of the control action.

scholarly journals Assessment of ECH stray radiation levels at the W7-X Michelson Interferometer and Profile Reflectometer

2019 ◽  
Vol 203 ◽  
pp. 03010
Author(s):  
Johan. W. Oosterbeek ◽  
Neha Chaudhary ◽  
Matthias Hirsch ◽  
Udo Höfel ◽  
Robert. C. Wolf ◽  
...  
Keyword(s):  
Broad Band ◽  
Michelson Interferometer ◽  
Notch Filter ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Fusion Plasmas ◽  
High Power Microwaves ◽  
Stray Radiation ◽  
Cyclotron Emission ◽  
And Control

Electron Cyclotron Heating and Electron Cyclotron Current Drive are key components for heating and control in magnetically confined fusion plasmas. The high power microwaves are not always completely absorbed leading to stray radiation [1], [2]. At W7-X, the total injected microwave power can be up to 7.5 MW @140 GHz while the entire Electron Cyclotron Emission picked-up by an observer at the edge of the plasma is a fraction of a mW. In the situation of a Michelson Interferometer, the principle measurement is the entire ECE spectrum. Thus, any stray radiation is bound to enter the spectrum. In this work initial stray radiation measurements without filters at the location of two microwave receivers -the Michelson Interferometer and the Profile Reflectometer -are discussed. The data is used to dimension a notch filter to be used with the broad band Michelson Interferometer.

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