Electrical Design Of Electrostatic Deflectors For Sector Focused Cyclotrons
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Electrical Design of Electrostatic Deflectors for Sector-FocusedCyclotrons
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Release | : 1963 |
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The new sector-focused cyclotrons have more energetic and better focused beams at the extraction radius than do ordinary cyclotrons. While the flrst characteristic requires a more intense electric field, the second permits this field to extend over a smaller volume. By tailoring the electrode geometry to these characteristics of the beam, the required deflector gap and electrode surface become smaller, and a higher gradient can be held without sparking. A different compromise between radioactivity, power dissipation, and resistance to spark damage must be made in selecting electrode materials. Carefully designed electrostatic deflectors perform very well in sector-focused cyclotrons of intermediate energy. Deflector efficiencies of about 50% and external-beam intensities of 20 mu amp have been obtained in the Lawrence Laboratory's 88-Inch cyclotron. (auth).
Deflector Power Supply for Sector-Focused Cyclotrons
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Release | : 1963 |
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Because of the higher particle energy sector-focused cyclotrons require higher gradients in their electrostatic deflectors than ordinary cyclotrons. A higher operating gradient can be achieved by exciting the deflector from a low- energy-storage power supply that permits control of the electrode surface heating during each spark. A pair of high-frequency Cockcroft-Walton rectifiers with this capability was built for the Lawrence Radiation Laboratory's 88-Inch Cyclotron. Each rectifier consists of a six-stage circuit designed to deliver 120 kv at 5 mamp. It is driven by a 100-kc oscillator. The rectifier is built from inexpensive silicon diodes, each with a rating of 600 piV, 0.75 amp, and a storage time of 2 mu sec. The diodes are assembled on etched circuit boards. Between decks of the rectifier, 900-pf, 30-kv ceramic capacitors similar to those in television sets are used. The dc output voltage is controlled by plate modulation of the oscillator and regulated to 0.01% by an electronic regulator. The rectifier is protected against spark-induced surge currents by an electronic crowbar operating on the screen grid of the oscillator. (auth).
Atomic Energy Research Reports for Sale by the U.S. Department of Commerce, Office of Technical Services
Author | : Business and Defense Services Administration |
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Total Pages | : 64 |
Release | : 1964 |
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Reports Received by Division of Technical Information Extension
Author | : U.S. Atomic Energy Commission. Division of Technical Information |
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Total Pages | : 830 |
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Genre | : Nuclear energy |
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