Intense negative hydrogen ion source for neutral injection into tokamaks

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In this scheme negative ions are extracted from a plasma source, accelerated to the required energy and then neutralized by stripping in a gas, metal vapor or plasma jet. One of the most promising direct extraction sources is the magnetron source, operating in the mixed hydrogen-cesium mode. In the present source cathode current densities are up to 20 A/cm$sup 2$ at arc voltages between 100 V and 150 V. In order to utilize the discharge more efficiently multislit extraction geometry was adopted. Highest currents were obtained by using six slits, with a total extraction area of 1.35 cm$sup 2$. At ... continued below

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Pages: 5

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Prelec, K. & Sluyters, T. January 1, 1975.

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Description

In this scheme negative ions are extracted from a plasma source, accelerated to the required energy and then neutralized by stripping in a gas, metal vapor or plasma jet. One of the most promising direct extraction sources is the magnetron source, operating in the mixed hydrogen-cesium mode. In the present source cathode current densities are up to 20 A/cm$sup 2$ at arc voltages between 100 V and 150 V. In order to utilize the discharge more efficiently multislit extraction geometry was adopted. Highest currents were obtained by using six slits, with a total extraction area of 1.35 cm$sup 2$. At an extraction voltage of 18 kV negative hydrogen ion currents close to 1 A were obtained, which corresponds to current densities of about 0.7 A/cm$sup 2$ at the extraction aperture. Pulse length was 10-20 ms and the repetition rate 0.1 Hz. The total extracted current was usually 2-3 times the H$sup -$ current. (auth)

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Pages: 5

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  • IEEE 6. symposium on engineering problems of fusion research, San Diego, California, USA, 17 Nov 1975

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  • Report No.: BNL--20656
  • Report No.: CONF-751125--87
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4139084
  • Archival Resource Key: ark:/67531/metadc865378

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  • January 1, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Sept. 21, 2016, 7:01 p.m.

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Prelec, K. & Sluyters, T. Intense negative hydrogen ion source for neutral injection into tokamaks, article, January 1, 1975; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc865378/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.