An overview of the software architecture of the plasma position, current and density realtime controller of the FTU

Boncagni, L.; Vitelli, R.; Carnevale, D.; Galperti, C.; Artaserse, G.; Pucci, Daniele

doi:10.1016/j.fusengdes.2014.02.039

Cited by 3 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The FTU PCS, extensively described in [31], exploits the current flowing within the T coil, called the central solenoid, to impose I p via inductive effect. The T coil current I T is regu lated via a feedback control scheme based on a proportionalintegral-derivative (PID) regulator, which is driven by the I p error plus a preprogrammed signal.…”

Section: Runaway Electron Controlmentioning

confidence: 99%

Runaway electron generation and control

Esposito

Boncagni

Buratti

et al. 2016

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

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.

show abstract

Section: Runaway Electron Controlmentioning

confidence: 99%

Runaway electron generation and control

Esposito

Boncagni

Buratti

et al. 2016

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

“…The active coils used to control the position and the current of the plasma are shown in Figure 1. The PCS of FTU, extensively described in [18], exploits the current flowing within the T coil, called the central solenoid, to impose the plasma current via inductive effect. The T coil current I T is regulated via a feedback control scheme based on a Proportional-Integral-Derivative (PID) regulator, which is driven by the plasma current error plus a preprogrammed signal.…”

Section: Control Strategiesmentioning

confidence: 99%

“…In Figure 3. (b) we have reported the time traces of R int and R ext , that are the internal and external plasma radii evaluated via magnetic measurements of the pick-up coils (see [18]). In the same subplot, we have depicted the interferometer barycenter, i.e.…”

Section: Re Beam Analysismentioning

confidence: 99%

“…In the same subplot, we have depicted the interferometer barycenter, i.e. the major radius corresponding to the highest peak of the interferometer density profile, and the Gaussian barycenter that is the major radius corresponding to the highest peak of the Gaussian functions that are very similar to the magnetic axes depicted in green solid line with circle marks obtained by using the ODIN algorithm, an equilibrium code that uses magnetic measurements [18]. For the considered discharge #35965 of Fig.…”

Section: Re Beam Analysismentioning

confidence: 99%

See 1 more Smart Citation

Runaway Electron Control in FTU

Carnevale¹,

Esposito²,

Gospodarczyk³

et al. 2015

Preprint

View full text Add to dashboard Cite

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.

show abstract