First operations with the new Collective Thomson Scattering diagnostic on the Frascati Tokamak Upgrade device

W. Bin; A. Bruschi; O. D'Arcangelo; C. Castaldo; M. De Angeli; L. Figini; C. Galperti; S. Garavaglia; G. Granucci; G. Grosso; Søren Bang Korsholm; M. Lontano; V. Mellera; D. Minelli; A. Moro; A. Nardone; Stefan Kragh Nielsen; Jesper Rasmussen; A. Simonetto; Morten Stejner Pedersen; U. Tartari

doi:10.1088/1748-0221/10/10/P10007

First operations with the new Collective Thomson Scattering diagnostic on the Frascati Tokamak Upgrade device

W. Bin, A. Bruschi, O. D'Arcangelo, C. Castaldo, M. De Angeli, L. Figini, C. Galperti, S. Garavaglia, G. Granucci, G. Grosso, Søren Bang Korsholm, M. Lontano, V. Mellera, D. Minelli, A. Moro, A. Nardone, Stefan Kragh Nielsen, Jesper Rasmussen, A. Simonetto, Morten Stejner PedersenU. Tartari

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Abstract

Anomalous emissions were found over the last few years in spectra of Collective Thomson Scattering (CTS) diagnostics in tokamak devices such as TEXTOR, ASDEX and FTU, in addition to real CTS signals. The signal frequency, down-shifted with respect to the probing one, suggested a possible origin in Parametric Decay Instability (PDI) processes correlated with the presence of magnetic islands and occurring for pumping wave power levels well below the threshold predicted by conventional models. A threshold below or close to the Electron Cyclotron Resonance Heating (ECRH) power levels could limit, under certain circumstances, the use of the ECRH in fusion devices. An accurate characterization of the conditions for the occurrence of this phenomenon and of its consequences is thus of primary importance. Exploiting the front-steering configuration available with the real-time launcher, the implementation of a new CTS setup now allows studying these anomalous emission phenomena in FTU under conditions of density and wave injection geometry that are more similar to those envisaged for CTS in ITER. The upgrades of the diagnostic are presented as well as a few preliminary spectra detected with the new system during the very first operations in 2014.

Original language	English
Article number	P10007
Journal	Journal of Instrumentation
Volume	10
Issue number	10
ISSN	1748-0221
DOIs	https://doi.org/10.1088/1748-0221/10/10/P10007
Publication status	Published - 2015
Event	1st EPS Conference on Plasma Diagnostics - Frascati, Italy Duration: 14 Apr 2015 → 17 Apr 2015 Conference number: 1

Conference

Conference	1st EPS Conference on Plasma Diagnostics
Number	1
Country/Territory	Italy
City	Frascati
Period	14/04/2015 → 17/04/2015

Bibliographical note

The present work has been carried out under an EUROfusion Enabling Research project. A shorter version of this contribution is due to be published in PoS at: 1st EPS conference on Plasma Diagnostics.

Keywords

Nuclear instruments and methods for hot plasma diagnostics
Microwave Antennas

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Bin, W., Bruschi, A., D'Arcangelo, O., Castaldo, C., Angeli, M. D., Figini, L., Galperti, C., Garavaglia, S., Granucci, G., Grosso, G., Korsholm, S. B., Lontano, M., Mellera, V., Minelli, D., Moro, A., Nardone, A., Nielsen, S. K., Rasmussen, J., Simonetto, A., ... Tartari, U. (2015). First operations with the new Collective Thomson Scattering diagnostic on the Frascati Tokamak Upgrade device. Journal of Instrumentation, 10(10), Article P10007. https://doi.org/10.1088/1748-0221/10/10/P10007

@inproceedings{6c39628f73a349bfaf4a89a66af6131d,

title = "First operations with the new Collective Thomson Scattering diagnostic on the Frascati Tokamak Upgrade device",

abstract = "Anomalous emissions were found over the last few years in spectra of Collective Thomson Scattering (CTS) diagnostics in tokamak devices such as TEXTOR, ASDEX and FTU, in addition to real CTS signals. The signal frequency, down-shifted with respect to the probing one, suggested a possible origin in Parametric Decay Instability (PDI) processes correlated with the presence of magnetic islands and occurring for pumping wave power levels well below the threshold predicted by conventional models. A threshold below or close to the Electron Cyclotron Resonance Heating (ECRH) power levels could limit, under certain circumstances, the use of the ECRH in fusion devices. An accurate characterization of the conditions for the occurrence of this phenomenon and of its consequences is thus of primary importance. Exploiting the front-steering configuration available with the real-time launcher, the implementation of a new CTS setup now allows studying these anomalous emission phenomena in FTU under conditions of density and wave injection geometry that are more similar to those envisaged for CTS in ITER. The upgrades of the diagnostic are presented as well as a few preliminary spectra detected with the new system during the very first operations in 2014. ",

keywords = "Nuclear instruments and methods for hot plasma diagnostics, Microwave Antennas",

author = "W. Bin and A. Bruschi and O. D'Arcangelo and C. Castaldo and Angeli, {M. De} and L. Figini and C. Galperti and S. Garavaglia and G. Granucci and G. Grosso and Korsholm, {S{\o}ren Bang} and M. Lontano and V. Mellera and D. Minelli and A. Moro and A. Nardone and Nielsen, {Stefan Kragh} and Jesper Rasmussen and A. Simonetto and Pedersen, {Morten Stejner} and U. Tartari",

note = "The present work has been carried out under an EUROfusion Enabling Research project. A shorter version of this contribution is due to be published in PoS at: 1st EPS conference on Plasma Diagnostics.; 1st EPS Conference on Plasma Diagnostics, 1st ECPD ; Conference date: 14-04-2015 Through 17-04-2015",

year = "2015",

doi = "10.1088/1748-0221/10/10/P10007",

language = "English",

volume = "10",

journal = "Journal of Instrumentation",

issn = "1748-0221",

publisher = "IOP Publishing",

number = "10",

}

Bin, W, Bruschi, A, D'Arcangelo, O, Castaldo, C, Angeli, MD, Figini, L, Galperti, C, Garavaglia, S, Granucci, G, Grosso, G, Korsholm, SB, Lontano, M, Mellera, V, Minelli, D, Moro, A, Nardone, A, Nielsen, SK , Rasmussen, J, Simonetto, A, Pedersen, MS & Tartari, U 2015, 'First operations with the new Collective Thomson Scattering diagnostic on the Frascati Tokamak Upgrade device', Journal of Instrumentation, vol. 10, no. 10, P10007. https://doi.org/10.1088/1748-0221/10/10/P10007

TY - GEN

T1 - First operations with the new Collective Thomson Scattering diagnostic on the Frascati Tokamak Upgrade device

AU - Bin, W.

AU - Bruschi, A.

AU - D'Arcangelo, O.

AU - Castaldo, C.

AU - Angeli, M. De

AU - Figini, L.

AU - Galperti, C.

AU - Garavaglia, S.

AU - Granucci, G.

AU - Grosso, G.

AU - Korsholm, Søren Bang

AU - Lontano, M.

AU - Mellera, V.

AU - Minelli, D.

AU - Moro, A.

AU - Nardone, A.

AU - Nielsen, Stefan Kragh

AU - Rasmussen, Jesper

AU - Simonetto, A.

AU - Pedersen, Morten Stejner

AU - Tartari, U.

N1 - Conference code: 1

PY - 2015

Y1 - 2015

N2 - Anomalous emissions were found over the last few years in spectra of Collective Thomson Scattering (CTS) diagnostics in tokamak devices such as TEXTOR, ASDEX and FTU, in addition to real CTS signals. The signal frequency, down-shifted with respect to the probing one, suggested a possible origin in Parametric Decay Instability (PDI) processes correlated with the presence of magnetic islands and occurring for pumping wave power levels well below the threshold predicted by conventional models. A threshold below or close to the Electron Cyclotron Resonance Heating (ECRH) power levels could limit, under certain circumstances, the use of the ECRH in fusion devices. An accurate characterization of the conditions for the occurrence of this phenomenon and of its consequences is thus of primary importance. Exploiting the front-steering configuration available with the real-time launcher, the implementation of a new CTS setup now allows studying these anomalous emission phenomena in FTU under conditions of density and wave injection geometry that are more similar to those envisaged for CTS in ITER. The upgrades of the diagnostic are presented as well as a few preliminary spectra detected with the new system during the very first operations in 2014.

AB - Anomalous emissions were found over the last few years in spectra of Collective Thomson Scattering (CTS) diagnostics in tokamak devices such as TEXTOR, ASDEX and FTU, in addition to real CTS signals. The signal frequency, down-shifted with respect to the probing one, suggested a possible origin in Parametric Decay Instability (PDI) processes correlated with the presence of magnetic islands and occurring for pumping wave power levels well below the threshold predicted by conventional models. A threshold below or close to the Electron Cyclotron Resonance Heating (ECRH) power levels could limit, under certain circumstances, the use of the ECRH in fusion devices. An accurate characterization of the conditions for the occurrence of this phenomenon and of its consequences is thus of primary importance. Exploiting the front-steering configuration available with the real-time launcher, the implementation of a new CTS setup now allows studying these anomalous emission phenomena in FTU under conditions of density and wave injection geometry that are more similar to those envisaged for CTS in ITER. The upgrades of the diagnostic are presented as well as a few preliminary spectra detected with the new system during the very first operations in 2014.

KW - Nuclear instruments and methods for hot plasma diagnostics

KW - Microwave Antennas

U2 - 10.1088/1748-0221/10/10/P10007

DO - 10.1088/1748-0221/10/10/P10007

M3 - Conference article

SN - 1748-0221

VL - 10

JO - Journal of Instrumentation

JF - Journal of Instrumentation

IS - 10

M1 - P10007

T2 - 1st EPS Conference on Plasma Diagnostics

Y2 - 14 April 2015 through 17 April 2015

ER -

First operations with the new Collective Thomson Scattering diagnostic on the Frascati Tokamak Upgrade device

Abstract

Conference

Bibliographical note

Keywords

Access to Document

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