Reflectometry measurements of turbulence in Alcator C-Mod plasmas

Slides:

Advertisements

Similar presentations

Enabling Technology on Alcator C-Mod Jim Irby MIT-PSFC.

Advertisements

ASIPP Characteristics of edge localized modes in the superconducting tokamak EAST M. Jiang Institute of Plasma Physics Chinese Academy of Sciences The.

Measurement of magnetic island width by using multi-channel ECE radiometer on HT-7 tokamak Han Xiang( 韩翔 ), Ling Bili( 凌必利 ), Gao Xiang( 高翔 ), Liu Yong(

© ABB Group Jun-15 Thermal interruption performance and fluctuations in high voltage gas circuit breakers N.P. Basse, M. Seeger, C.M. Franck and.

Physics of fusion power Lecture 11: Diagnostics / heating.

ITER reflectometry diagnostics operation limitations caused by strong back and small angle scattering E.Gusakov 1, S. Heuraux 2, A. Popov 1 1 Ioffe Institute,

HEAT TRANSPORT andCONFINEMENTin EXTRAP T2R L. Frassinetti, P.R. Brunsell, M. Cecconello, S. Menmuir and J.R. Drake.

D. Borba 1 21 st IAEA Fusion Energy Conference, Chengdu China 21 st October 2006 Excitation of Alfvén eigenmodes with sub-Alfvénic neutral beam ions in.

Measurements with the KSTAR Beam Emission Spectroscopy diagnostic system Máté Lampert Wigner Research Centre for Physics Hungarian Academy of Sciences.

Fast imaging of global eigenmodes in the H-1 heliac ABSTRACT We report a study of coherent plasma instabilities in the H-1 plasma using a synchronous gated.

Nils P. Basse Plasma Science and Fusion Center Massachusetts Institute of Technology Cambridge, MA USA ABB seminar November 7th, 2005 Measurements.

Reflectometry on Alcator C-Mod: Status and future upgrades Outline: C-Mod reflectometry Physics examples Upgrades: 1.High frequency 2.Sideband 3.Data acquisition.

J A Snipes, 6 th ITPA MHD Topical Group Meeting, Tarragona, Spain 4 – 6 July 2005 TAE Damping Rates on Alcator C-Mod Compared with Nova-K J A Snipes *,

IPP - Garching Reflectometry Diagnostics and Rational Surface Localization with Fast Swept Systems José Vicente

Interplay between confinement, turbulence and magnetic topology Nils P. Basse, S. Zoletnik 1, W. L. Rowan 2 et al. MIT Plasma Science and Fusion Center.

The principle of SAMI and some results in MAST 1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui, , China 2. Culham Centre.

12/03/2013, Praga 1 Plasma MHD Activity Observations via Magnetics Diagnostics: Magnetic island Analysis Magnetic island Analysis Frederik Ostyn (UGent)

Research activity on the T-10 tokamak G. Kirnev on behalf of T-10 team Nuclear Fusion Institute, RRC “Kurchatov Institute”, Moscow , Russia.

1 B. C. Stratton, S. von Goeler, J. Robinson, and L. E. Zakharov Princeton Plasma Physics Laboratory, Princeton, New Jersey, USA D. Stutman and K. Tritz.

Flow and Shear behavior in the Edge and Scrape- off Layer in NSTX L-Mode Plasmas Y. Sechrest and T. Munsat University of Colorado at Boulder S. J. Zweben.

1 Results and analysis of Gas Puff Imaging experiments in NSTX: turbulence, L-H transitions, ELMs and other phenomena R.J. Maqueda Nova Photonics S.J.

Characterization of core and edge turbulence in L- and H-mode Alcator C-Mod plasmas Outline: Alcator C-Mod tokamak Fluctuation diagnostics Low to high.

Toroidal rotation in ECRH L-mode, I-phase and H-mode on HL-2A tokamak A.P. Sun, J.Q. Dong, X.Y. Han, C.H. Liu, J.Y. Cao, M. Huang, Y.G. Li, X. L. Huang.

1 C. E. Bush (ORNL), B. C. Stratton, S. von Goeler, J. Robinson, L. E. Zakharov, E. Fredrickson (PPPL) D. Stutman and K. Tritz (JHU) and the NSTX Team.

Upgrade Plan of FIReTIP System and Toroidal Magnetic Field Measured by Polarimetry on NSTX* K.C. Lee, C.W. Domier, M. Johnson, H. Chen, N.C. Luhmann, Jr.

Nonlinear Optics in Plasmas. What is relativistic self-guiding? Ponderomotive self-channeling resulting from expulsion of electrons on axis Relativistic.

بسمه تعالی Fast Imaging of turbulent plasmas in the GyM device D.Iraji, D.Ricci, G.Granucci, S.Garavaglia, A.Cremona IFP-CNR-Milan 7 th Workshop on Fusion.

Investigation of fast ion mode spatial structure in NSTX N.A. Crocker, S. Kubota, W.A. Peebles (UCLA); E.D. Fredrickson, N.N. Gorelenkov, G.J. Kramer,

Status of reflectometry and phase-contrast imaging on Alcator C-Mod Outline: Sequence of events Status of reflectometry Status of PCI Plans Nils P. Basse.

A Microwave Reflectometry Based On Amplitude Modulation onHT-7 Tokamak B.L.Ling, Institute of Plasma Physics, Chinese Academy of Sciences, P.O.Box 1126,

Temporal separation of turbulent time series: Measurements and simulations Nils P. Basse 1,2, S. Zoletnik, M. Saffman, G. Antar, P. K. Michelsen and the.

Measurements of plasma turbulence by laser scattering in the Wendelstein 7-AS stellarator Nils P. Basse 1,2, S. Zoletnik, M. Saffman, P. K. Michelsen and.

High Speed Imaging of Edge Turbulence in NSTX S.J. Zweben, R. Maqueda 1, D.P. Stotler, A. Keesee 2, J. Boedo 3, C. Bush 4, S. Kaye, B. LeBlanc, J. Lowrance.

LCWA09 – October 1 st S. De Santis Measurements of the Electron Cloud Density by TE wave propagation in Cesr-TA M. Billing, J. Calvey, B. Carlson, S. De.

Edge Turbulence in High Density Ohmic Plasmas on NSTX K.M. Williams, S.J. Zweben, J. Boedo, R. Maingi, C.E. Bush NSTX XP Presentation Draft 5/25/06.

Enhanced D  H-mode on Alcator C-Mod presented by J A Snipes with major contributions from M Greenwald, A E Hubbard, D Mossessian, and the Alcator C-Mod.

1Field-Aligned SOL Losses of HHFW Power and RF Rectification in the Divertor of NSTX, R. Perkins, 11/05/2015 R. J. Perkins 1, J. C. Hosea 1, M. A. Jaworski.

D-Alpha Fast-Ion Diagnostic: Recent Results from DIII-D W.W. Heidbrink, UC Irvine D-Alpha Diagnostic: Yadong Luo, K. Burrell, + Ion Cyclotron Heating:

بسمه تعالی Fast Imaging of turbulent plasmas in the GyM device D.Iraji, D.Ricci, G.Granucci, S.Garavaglia, A.Cremona IFP-CNR-Milan 7 th Workshop on Fusion.

Using microwaves to study fast ion driven modes in NSTX N.A. Crocker, S. Kubota, W.A. Peebles, G. Wang, T. Carter (UCLA); E.D. Fredrickson, B.P. LeBlanc,

47th Annual Meeting of the Division of Plasma Physics, October 24-28, 2005, Denver, Colorado ECE spectrum of HSX plasma at 0.5 T K.M.Likin, H.J.Lu, D.T.Anderson,

Interplay between confinement, turbulence and magnetic topology Nils P. Basse MIT Plasma Science and Fusion Center This proposal originates from density.

1) For equivalent ECRH power, off-axis heating results in lower stored energy and lower core temperature 2) Plasma flow is significantly reduced with off-axis.

Correlation reflectometry for pitch angle measurements on NSTX 2005/7/20 A. Ejiri Univ. Tokyo Outline Correlation reflectometry and pitch angle measurement.

Scaling experiments of perturbative impurity transport in NSTX D. Stutman, M. Finkenthal Johns Hopkins University J. Menard, E. Synakowski, B. Leblanc,R.

Simulation of Turbulence in FTU M. Romanelli, M De Benedetti, A Thyagaraja* *UKAEA, Culham Sciance Centre, UK Associazione.

Plasma Turbulence in the HSX Stellarator Experiment and Probes C. Lechte, W. Guttenfelder, K. Likin, J.N. Talmadge, D.T. Anderson HSX Plasma Laboratory,

Supported by Experimental studies of ion-scale fluctuations via microwave imaging reflectometry in KSTAR 5 th EAST-Asia School and Workshop (EASW) on Laboratory,

Profiles of density fluctuations in frequency range of (20-110)kHz Core density fluctuations Parallel flow measured by CHERS Core Density Fluctuations.

SAWTOOTH AND M=1 MODE BEHAVIOUR IN FTU PELLET ENHANCED DISCHARGES

Turbulence wave number spectra reconstruction

Reduction of Neoclassical Transport and Observation of a Fast Electron Driven Instability with Quasisymmetry in HSX J.M. Canik1, D.L. Brower2, C. Deng2,

Turbulence associated with the control of internal transport barriers

Two new tools at Alcator C-Mod yield fundamental insights into short-, coherent edge fluctuations associated with steady-state, reactor-relevant regimes.

in tokamaks and stellarators

Charge Exchange Analysis Diagnostic Development

Characteristics of Edge Turbulence in HSX

MHD Induced Fast Ion Loss Diagnostic for Alcator C-Mod

R. Granetz1, S. Wolfe1, D. Whyte1, V. Izzo1, M. Reinke1, J. Terry1, A

GHz reflectometer to be operated in X-mode

High Bootstrap Fraction Plasmas with ITBs

First Experiments Testing the Working Hypothesis in HSX:

Investigation of triggering mechanisms for internal transport barriers in Alcator C-Mod K. Zhurovich C. Fiore, D. Ernst, P. Bonoli, M. Greenwald, A. Hubbard,

Diagnosis of Pellet Induced Bootstrap Current with Alfvén Cascades

Comparisons of Measurements and Gyro-kinetic Simulations of Turbulence and Trans-port in Alcator C-Mod EDA H-Mode Discharges M. B. Sampsell, R. V. Bravenec.

Visible Doppler Spectrometer for Edge Toroidal Rotation

Stereoscopic Pellet Imaging

Stable TAE n Discrimination with Plasma Rotation

NATIONAL RESEARCH CENTER “KURCHATOV INSTITUTE”

Presentation transcript:

Reflectometry measurements of turbulence in Alcator C-Mod plasmas Nils P. Basse, Y. Lin, G. J. Kramer1, J. H. Irby, R. Nazikian1, B. D. Bose, C. L. Fiore, E. S. Marmar, J. A. Snipes, J. L. Terry, S. M. Wolfe, S. J. Wukitch, K. Zhurovich MIT Plasma Science and Fusion Center 1Princeton Plasma Physics Laboratory Outline: Reflectometer Discharges Analysis Conclusions 45th APS-DPP conference, October 27-31, 2003 Albuquerque, New Mexico, USA

Reflectometer Off-axis ICRF internal transport barrier (ITB). Pellet enhanced performance (PEP) mode. Grey: MIT system (5 channels), light blue: PPPL system (2 channels). Low frequency (50-110 GHz) system: Amplitude modulated, O-mode. The upper and lower sidebands are separately detected for the 88 GHz channel. High frequency (132-140 GHz) system: Dedicated fluctuation channels, have been brought into operation from May to July 2003.

Discharge waveforms Li-pellet injection Black: H-mode (1030709022) Red: L-mode (1030709027)

Thomson density profiles

Bremsstrahlung profiles Visible bremsstrahlung profiles for pellet injection into H-mode. L-mode profiles. Time resolution of profiles is 0.5 ms, spatial resolution is 1 mm. Pellet injection is from the low field side, close to the midplane. The Li-pellet has a size of 1/2 mm3 and a velocity of 800 m/s. Detection of ablation cloud by high-speed gated CCD camera.

Spectrograms Spectrograms of two reflectometer channels for the H-mode shot. Spectrograms for the L-mode shot. The 132 GHz signal disappears when the density decays below cutoff.

Cross correlations Cross correlation between rms magnetic fluctuations and 132 GHz reflectometer band autopowers for the H-mode shot. Band resolution 50 kHz, time resolution 0.5 ms. Cross correlation for the L-mode shot. Positive (negative) time lag: Density fluctuations occur before (after) the magnetic fluctuations.

Conclusions First turbulence measurements from two new high frequency reflectometer channels have been made in Alcator C-Mod. We have studied two discharges where Li-pellets were injected: Density perturbation decays in roughly 15 ms. 132 GHz signals almost identical for the two shots: Core fluctuations low frequency compared to edge fluctuations. Correlations with magnetic fluctuations show that density and magnetic fluctuations are strongly (weakly) correlated for the shot initially in H- (L-) mode. Future analysis and upgrades: Non-RF heated plasmas display a stronger density peaking and a slower decay, about 30 ms, in response to pellet injections. Correlation analysis will be extended to include phase-contrast imaging, D-alpha, correlations between reflectometry channels et cetera. Reflectometer will be upgraded to a ’pure’ fluctuation diagnostic (removal of amplitude modulation).