A5038917478- Magnetic confinement fusion research
- Fusion materials and technologies
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Nuclear reactor physics and engineering
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Nuclear Materials and Properties
- Atomic and Subatomic Physics Research
- Anomaly Detection Techniques and Applications
- Magneto-Optical Properties and Applications
- Fault Detection and Control Systems
- Advanced Frequency and Time Standards
- Nuclear Physics and Applications
- Laser Design and Applications
- High-Energy Particle Collisions Research
Forschungszentrum Jülich
2005-2024
Royal Military Academy
2020
Budker Institute of Nuclear Physics
2008
Abstract The paper reports the first demonstration of in situ laser-induced desorption — quadrupole mass spectrometry (LID-QMS) application on a large scale fusion device performed summer 2023. LID-QMS allows direct measurements fuel inventory plasma facing components without retrieving them from device. diagnostic desorbs retained gases by heating 3 mm diameter spot wall using 1 ms long laser pulse and detects QMS. Thus, it can measure gas content at any position accessible to laser....
A new endoscope with optimised divertor view has been developed in order to survey and monitor the emission of specific impurities such as tungsten remaining carbon well beryllium JET after implementation ITER-like wall 2011. The is a prototype for testing an ITER relevant design concept based on reflective optics only. It may be subject high neutron fluxes expected ITER. operating wavelength range, from 390 nm 2500 nm, allows measurements all (W I, Be II, C III) optical transmittance (≥30%...
At the TEXTOR tokamak in Jülich, Germany, a modular dispersion interferometer was installed and operated for first time. Equipped with four lines of sight, line-integrated density could be measured parallel at different major radii resolution better than 3 × 1017 m−2. This paper will describe setup show measurement results. Among others, it possible to detect evolution disruption time 4 μs. The movement runaway beam following resolved spatially temporarily.
A group of edge diagnostics and modelling has been developed for investigation synergy between 3D physics plasma-wall interactions on Wendelstein 7-X (W7-X). Two endoscopes have designed visible ultraviolet spectroscopy tomography the plasma edge, along with infrared thermography divertor tiles. 2D profiles impurities (e.g. helium, carbon) will be measured by two viewing island region in a spatial resolution <2 mm. multipurpose manipulator, which is used as carrier either probe head...
The design and main characteristics of 14-channel dispersion interferometer for plasma profile measurement control in TEXTOR tokamak are presented. diagnostic is engineered on the basis modular concept, 10.6 microm CO(2) laser source all optical mechanical elements each module arranged a compact housing. A set mirrors retroreflectors inside vacuum vessel provides full coverage torus cross section with 12 vertical two diagonal lines sight, no rigid frame vibration isolation required. Results...
We propose to use dispersion interferometer for measurement of plasma density and control position on present future fusion devices. Distinguishing feature this scheme is probing two wavelengths. Short-wave radiation formed by method frequency fundamental doubling. Probing first second harmonics rays are combined spatially at the same time. It allows create which sensitive only studied medium weakly vibration optical elements. Designs system results measurements GDT mirror TEXTOR tokamak presented.
A second harmonics or dispersion interferometer (DI) is a promising approach for the measurement of line-integrated densities on fusion devices. In contrast to conventional two-color interferometer, (SH) an beam, generated by non-linear optical crystal, used as probing beam. Since few years, crystals with sufficient conversion rate are available infrared (IR) spectrum around 10%m. Several types these IR have phase-matching angle range big ¿1°, which great advantage SH generation...
This paper gives an overview of ICRF plasma production in TEXTOR-94 using the present two double loop antennas, one with and without Faraday screen, for start-up OH discharges conditioning / coating vessel. The results show that He-plasma density up to n̄e0≈3×1012 cm−3 is reliably produced at standard ICRH frequency (f=32.5 MHz) a wide range toroidal magnetic field BT=0.20–2.25 T (2ωci⩽ω⩽20ωci), gas pressure pHe=1×10−5−1×10−3 mbar total RF power generators PRF=2×600 kW best cases. In...