MARTe at FTU: The new feedback control

Boncagni, L.; Sadeghi, Yahya; Carnevale, D.; Geronimo, Andrea Di; Varano, G.; Vitelli, R.; Galperti, C.; Zarfati, Emanuele; Pucci, Daniele

doi:10.1016/j.fusengdes.2012.08.006

Cited by 9 publications

(3 citation statements)

References 12 publications

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“…The horizontal position of the plasma is controlled by means of an additional PID regulator that is fed with the horizontal position error. Such error is obtained by online processing of a series of pickup coil signals to determine the plasma boundary (last closed magn etic surface) which is compared along the equatorial plane to the reference plasma internal R int and external R ext radii, (see [32][33][34][35] for further details). The current flowing in the F coil (I F ), by geometrical construction, allows us also to modify the plasma elongation ε.…”

Section: Runaway Electron Controlmentioning

confidence: 99%

Runaway electron generation and control

Esposito

Boncagni

Buratti

et al. 2016

Plasma Phys. Control. Fusion

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We present an overview of FTU experiments on runaway electron (RE) generation and control carried out through a comprehensive set of realtime (RT) diagnostics/control systems and newly installed RE diagnostics. An RE imaging spectrometer system detects visible and infrared synchrotron radiation. A Cherenkov probe measures RE escaping the plasma. A gamma camera provides hard xray radial profiles from RE bremsstrahlung interactions in the plasma. Experiments on the onset and suppression of RE show that the threshold electric field for RE generation is larger than that expected according to a purely collisional theory, but consistent with an increase due to synchrotron radiation losses. This might imply a lower density to be targeted with massive gas injection for RE suppression in ITER. Experiments on active control of disruptiongenerated RE have been performed through feedback on poloidal coils by implementing an RT boundaryreconstruction algorithm evaluated on magnetic moments. The results indicate that the slow plasma current rampdown and the simultaneous reduction of the reference plasma external radius are beneficial in dissipating the RE beam energy and population, leading to reduced RE interactions with plasma facing components. RE active control is therefore suggested as a possible alternative or complementary technique to massive gas injection.

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Section: Runaway Electron Controlmentioning

confidence: 99%

Runaway electron generation and control

Esposito

Boncagni

Buratti

et al. 2016

Plasma Phys. Control. Fusion

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show abstract

“…The horizontal position of the plasma is controlled by means of an additional PID regulator that is fed with the horizontal position error. The latter error is obtained by on-line processing of a series of pick-up coil signals to determine the plasma boundary (last closed magnetic surface) which is compared along the equatorial plane to the desired plasma internal R int and external R ext radii, see [19,20,21,22] for further details. The current flowing in the F coil (I F ), by geometrical construction, allows us also to modify the plasma elongation ê.…”

Section: Control Strategiesmentioning

confidence: 99%

Runaway Electron Control in FTU

Carnevale¹,

Esposito²,

Gospodarczyk³

et al. 2015

Preprint

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Experimental results on the position and current control of disruption generated runaway electrons (RE) in FTU are presented. A scanning interferometer diagnostic has been used to analyze the time evolution of the RE beam radial position and its instabilities. Correspondence of the interferometer time traces, radial profile reconstructed via magnetic measurements and fission chamber signals are discussed. New RE control algorithms, which define in real-time updated plasma current and position references, have been tested in two experimental scenarios featuring disruption generated RE plateaus. Comparative studies among 52 discharges with disruption generated RE beam plateaus are presented in order to assess the effectiveness of the proposed control strategies as the RE beam interaction with the plasma facing components is reduced while the current is ramped-down.

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“…We decided to adopt MARTe, a framework for real-time control developed at JET and currently in use in other fusion devices [18,19]. MARTe provides an OS abstraction layer, called BaseLib, and a set of C++ classes for the supervision and the execution of a set of Real-Time Threads.…”

Section: The Marte Frameworkmentioning

confidence: 99%