W. L. Rowan
YOU?
Author Swipe
View article: Diagnostics: Chapter 8 of the special issue: on the path to tokamak burning plasma operation
Diagnostics: Chapter 8 of the special issue: on the path to tokamak burning plasma operation Open
This chapter presents the activity conducted by the ITPA topical group (TG) on Diagnostics over about the last 15 years. Following a general introduction of the ITER Diagnostics led by their measurement roles, the document is organized in …
View article: Detecting neoclassical tearing modes in high-temperature ITER plasma scenarios with the ITER prototype electron cyclotron emission diagnostic
Detecting neoclassical tearing modes in high-temperature ITER plasma scenarios with the ITER prototype electron cyclotron emission diagnostic Open
Electron cyclotron emission (ECE) diagnostics for ITER serve two key purposes. The diagnostics will measure plasma electron temperature with high spatial and temporal resolution. Additionally, they will be used to detect neoclassical teari…
View article: Electron cyclotron emission detection of neoclassical tearing modes for control for ITER
Electron cyclotron emission detection of neoclassical tearing modes for control for ITER Open
Successful operation of ITER requires control of magnetic instabilities including neoclassical tearing modes (NTMs) that can degrade confinement and lead to disruption. Low latency detection by electron cyclotron emission (ECE) diagnostics…
View article: Prospects of negative triangularity tokamak for advanced steady-state confinement of fusion plasmas
Prospects of negative triangularity tokamak for advanced steady-state confinement of fusion plasmas Open
The steady-state confinement, beta limit, and divertor heat load are among the most concerned issues for toroidal confinement of fusion plasmas. In this work, we show that the negative triangularity tokamak has promising prospects to addre…
View article: Physics Studies for Assessment of Requirement of Displacement Compensation System for ITER ECE Diagnostic
Physics Studies for Assessment of Requirement of Displacement Compensation System for ITER ECE Diagnostic Open
The Electron Cyclotron Emission (ECE) diagnostic has the key function of measuring the core electron temperature profile and electron temperature fluctuation, from the intensity of electron cyclotron radiation emitted from the plasma along…
View article: Design of an electron cyclotron emission diagnostics suite for COMPASS Upgrade tokamak
Design of an electron cyclotron emission diagnostics suite for COMPASS Upgrade tokamak Open
COMPASS Upgrade is a medium size and high field tokamak that is capable of addressing key challenges for reactor grade tokamaks, including power exhaust and advanced confinement scenarios. Electron cyclotron emission will be available amon…
View article: Progress in ITER ECE diagnostic design and integration
Progress in ITER ECE diagnostic design and integration Open
The ITER electron cyclotron emission (ECE) diagnostic system has primary roles in providing measurements of the core electron temperature profile and the electron temperature fluctuation associated with the neoclassical tearing modes. The …
View article: Fast modulating electron cyclotron emission (FMECE) diagnostic for tokamaks
Fast modulating electron cyclotron emission (FMECE) diagnostic for tokamaks Open
Utilizing variable-frequency channels, e.g., yttrium iron garnet (YIG) bandpass filters, in the intermediate frequency (IF) section of an electron cyclotron emission (ECE) radiometer facilitates flexibility in the volume viewed by the ECE …
View article: Physics design of the in-vessel collection optics for the ITER electron cyclotron emission diagnostic
Physics design of the in-vessel collection optics for the ITER electron cyclotron emission diagnostic Open
Measurement of the electron cyclotron emission (ECE) is one of the primary diagnostics for electron temperature in ITER. In-vessel, in-vacuum, and quasi-optical antennas capture sufficient ECE to achieve large signal to noise with microsec…
View article: Progress in ITER ECE Diagnostic Design and Integration
Progress in ITER ECE Diagnostic Design and Integration Open
The ITER Electron Cyclotron Emission (ECE) diagnostic is progressing towards its Preliminary Design Review (PDR). In parallel, the diagnostic integration in the Equatorial Port is ongoing. Port Integration has to address the structural int…
View article: Overview of the ECE measurements on EAST
Overview of the ECE measurements on EAST Open
Radiometer systems and a Michelson interferometer, have been operated routinely to detect the elec-tron cyclotron emission (ECE) from EAST plasmas for diagnosing the local electron temperature. A common quasi-optical antenna placed inside …
View article: Estimating the performance of lithium beam measurements of current density and electron density in an H-mode pedestal
Estimating the performance of lithium beam measurements of current density and electron density in an H-mode pedestal Open
The lithium beam is an effective diagnostic tool for investigation of stability and particle transport in the pedestal. It was used successfully to measure edge current density on DIII-D, achieving qualitative agreement with neoclassical m…
View article: Upgrade of the ECE diagnostic on EAST
Upgrade of the ECE diagnostic on EAST Open
The electron cyclotron emission (ECE) diagnostic on the experimental advanced superconducting tokamak (EAST) was upgraded recently to provide electron temperature profile measurement with wider radial coverage and better precision. The low…
View article: Variable location channels to improve efficiency and precision for direct ∇<i>T</i> <i>e</i> measurements and high spatial resolution <i>T</i> <i>e</i>-profile measurements using electron cyclotron emission
Variable location channels to improve efficiency and precision for direct ∇<i>T</i> <i>e</i> measurements and high spatial resolution <i>T</i> <i>e</i>-profile measurements using electron cyclotron emission Open
Electron cyclotron emission (ECE) diagnostics that use variable location channels based on yttrium iron garnet (YIG) bandpass filters improve the precision and the efficiency of measurements of electron temperature (Te) profiles and fluctu…
View article: Four-dimensional calibration turntable of the motional Stark effect diagnostic on EAST
Four-dimensional calibration turntable of the motional Stark effect diagnostic on EAST Open
The motional Stark effect (MSE) diagnostic is applied to measure the safety factor q and current density profile of a tokamak device, which are important parameters in realizing the high-performance and long-pulse steady state of a tokamak…
View article: Electron critical gradient scale length measurements of ICRF heated L-mode plasmas at Alcator C-Mod tokamak
Electron critical gradient scale length measurements of ICRF heated L-mode plasmas at Alcator C-Mod tokamak Open
A profile for the critical gradient scale length (Lc) has been measured in L-mode discharges at the Alcator C-Mod tokamak, where electrons were heated by an ion cyclotron range of frequency through minority heating with the intention of si…
View article: ITER ECE Diagnostic: Design Progress of IN-DA and the diagnostic role for Physics
ITER ECE Diagnostic: Design Progress of IN-DA and the diagnostic role for Physics Open
The ECE Diagnostic system in ITER will be used for measuring the electron temperature profile evolution, electron temperature fluctuations, the runaway electron spectrum, and the radiated power in the electron cyclotron frequency range (70…
View article: Update on the status of the ITER ECE diagnostic design
Update on the status of the ITER ECE diagnostic design Open
Considerable progress has been made on the design of the ITER electron cyclotron emission (ECE) diagnostic over the past two years. Radial and oblique views are still included in the design in order to measure distortions in the electron m…
View article: Physics design of the in-vessel collection optics for the ITER electron cyclotron emission diagnostic
Physics design of the in-vessel collection optics for the ITER electron cyclotron emission diagnostic Open
Measurement of the electron cyclotron emission (ECE) is one of the primary diagnostics for electron temperature in ITER. In-vessel, in-vacuum, and quasi-optical antennas capture sufficient ECE to achieve large signal to noise with microsec…
View article: Design and first plasma measurements of the ITER-ECE prototype radiometer
Design and first plasma measurements of the ITER-ECE prototype radiometer Open
On ITER, second harmonic optically thick electron cyclotron emission (ECE) in the range of 220-340 GHz will supply the electron temperature (Te). To investigate the requirements and capabilities prescribed for the ITER system, a prototype …
View article: Large area black body source for ITER ECE in situ calibration
Large area black body source for ITER ECE in situ calibration Open
Development and testing of a hot calibration source for the ECE systems on ITER is underway. The source is intended to meet the requirements described in DDD55 Overview of Diagnostics. The requirement is for two 200 mm diameter sources. On…