Active Control of Magneto-hydrodynamic Instabilities in Hot - download pdf or read online

By Valentin Igochine

ISBN-10: 3662442213

ISBN-13: 9783662442210

ISBN-10: 3662442221

ISBN-13: 9783662442227

During the earlier century, world-wide strength intake has risen dramatically, which results in a quest for brand new strength resources. Fusion of hydrogen atoms in scorching plasmas is an enticing method of resolve the strength challenge, with considerable gasoline, inherent security and no long-lived radioactivity. although, one of many limits on plasma functionality is because of many of the periods of magneto-hydrodynamic instabilities which could happen. The physics and keep an eye on of those instabilities in smooth magnetic confinement fusion units is the topic of this publication. Written by way of best specialists, the contributions will supply useful reference and up to date examine studies for "old arms" and newbies alike.

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Extra resources for Active Control of Magneto-hydrodynamic Instabilities in Hot Plasmas

Example text

The achievable density is clearly reduced if the plasma is contaminated by impurities. Wall conditioning is a standard technique to avoid this situation. An example is presented in Fig. 13 for the TEXTOR tokamak. Different groups of data points in Fig. 13 show that the limit has increased due to the application of advanced wall coating methods: carbonized wall, boronized wall, and siliconized wall [20]. The basic idea is that the impurities released at the first wall can dilute the plasma and cause strong line radiation.

7b). In these regions the plasma resistivity cannot be neglected and leads to topological changes. These small regions have a dramatic influence on the global equilibrium. The plasma gets access to a new degree of freedom and tries to find the minimal energy state without topological limitations. The time scale for the resistive instability is a mixture 2 between slow resistive diffusion time (sR ¼ l0gl , where g is the plasma resistivity and l is the characteristic width of the reconnection region, l ( a) which reflects the topological changes, and fast dynamics of the plasma ðsA Þ.

The plasma is usually diaÀ magnetic bpol [ 1 , producing the field inside the plasma that partially cancels the applied toroidal magnetic field. In this situation, the forces on the high field side and on the lower field side are different, which À provides Á the net outward force. In the opposite, paramagnetic situation bpol \1 , the net force is directed inward (see Fig. 16b). • The ‘‘tire tube force’’ has a hydraulic nature and appears due to the difference in the inner and outer torus surfaces for the same pressure in the tube (see Fig.

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Active Control of Magneto-hydrodynamic Instabilities in Hot Plasmas by Valentin Igochine

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