Author: A. GaddPublisher:
ISBN:
Category : Electrons
Languages : en
Pages : 10
Book Description
First Results from the LIDAR-Thomson Scattering System on JET.
Author: A. GaddThe LIDAR Thomson Scattering Diagnostic on JET.
Author: J. BundgaardPublisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 23
Book Description
Status of the JET LIDAR Thomson Scattering Diagnostic
Author: M. MaslovPublisher:
ISBN:
Category : Plasma diagnostics
Languages : en
Pages : 12
Book Description
High Resolution LIDAR Thomson Scattering at JET
Author: Publisher:
ISBN:
Category : High resolution spectroscopy
Languages : en
Pages : 13
Book Description
Higher Spatial Resolution LIDAR Thomson Scattering at JET.
Author: C. GowersPublisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages :
Book Description
Recent Developments in LIDAR Thomson Scattering at JET
Author: Development of a Thomson Scattering Diagnostic on a Pulsed Power Machine and Its Use in Studying Laboratory Plasma Jets Focusing on the Effect of Current Polarity
Author: Jacob Thomas BanasekPublisher:
ISBN:
Category :
Languages : en
Pages : 176
Book Description
This research primarily focused on the development of a collective Thomson scattering system for experiments on a 1~MA 100~ns pulsed power generator at Cornell University (COBRA). This diagnostic is capable of determining, at a minimum, the electron temperature, electron density and the flow velocity in the plasma. It was used in experiments on plasma jets created using a radial Al foil (thin disk of foil) load on COBRA. These jets served as a good load as they were long-lasting and at the center of the experimental chamber. The first set of experiments explored the rotation of the jet when an external magnetic field is applied and found the jet to be rotating at about 20~km/s. During these experiments, it was discovered that the Thomson scatter laser energy (10~J) was sufficient to heat the 20~eV jet plasma by inverse bremsstrahlung. While this did not affect the velocity measurements, it did significantly affect the measured temperature of the plasma. To better study this perturbation, a streak camera was set up to measure the changing temperature during the laser pulse. The plasma was found to be heated from about 20 to 80~eV in the first half of the laser pulse, before cooling down due to the expansion of the plasma. We also started developing a system to record the high-frequency Thomson scattering spectral feature to measure the density of the plasma. This showed some initial promising results and suggested densities of at least $5\times10^$~cm$^{-3}$. Finally, using low enough laser energy to avoid laser heating of the plasma, the effect of current polarity on the plasma jets was studied experimentally. It was found that while jets with a radial outward current flow were denser and wider than jets with a radial inward current, both jets had a similar electron temperature. These experiments were also compared to extended magnetohydrodynamic (XMHD) simulations. While experimental jets had about the same width as those in the simulation, they were found to be slightly colder and significantly less dense than the simulations.
LIDAR-Thomson scattering
Author: "LIDAR Thomson scattering"
Author: Fusion Physics
Author: MITSURU KIKUCHIPublisher: International Atomic Energy
ISBN:
Category : Antiques & Collectibles
Languages : en
Pages : 1158
Book Description
Humans do not live by bread alone. Physically we are puny creatures with limited prowess, but with unlimited dreams. We see a mountain and want to move it to carve out a path for ourselves. We see a river and want to tame it so that it irrigates our fields. We see a star and want to fly to its planets to secure a future for our progeny. For all this, we need a genie who will do our bidding at a flip of our fingers. Energy is such a genie. Modern humans need energy and lots of it to live a life of comfort. In fact, the quality of life in different regions of the world can be directly correlated with the per capita use of energy [1.1–1.5]. In this regard, the human development index (HDI) of various countries based on various reports by the United Nations Development Programme (UNDP) [1.6] (Fig. 1.1), which is a parameter measuring the quality of life in a given part of the world, is directly determined by the amount of per capita electricity consumption. Most of the developing world (~5 billion people) is crawling up the UN curve of HDI versus per capita electricity consumption, from abysmally low values of today towards the average of the whole world and eventually towards the average of the developed world. This translates into a massive energy hunger for the globe as a whole. It has been estimated that by the year 2050, the global electricity demand will go up by a factor of up to 3 in a high growth scenario [1.7–1.9]. The requirements beyond 2050 go up even higher.