Laser diagnostic for high current H{sup {minus}} beams

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Description

In the last 5 years, significant technology advances have been made in the performance, size, and cost of solid-state diode-pumped lasers. These developments enable the use of compact Q-switched Nd:YAG lasers as a beam diagnostic for high current H{sup {minus}} beams. Because the threshold for photodetachment is only 0.75 eV, and the maximum detachment cross section is 4 {times} 10{sup {minus}17} cm{sup 2} at 1.5 eV, a 50 mJ/pulse Q-switched Nd:YAG laser can neutralize a significant fraction of the beam in a single 10-ns wide pulse. The neutral beam maintains nearly identical parameters as the parent H{sup {minus}} beam, including ... continued below

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8 p.

Creation Information

Shafer, R.E. May 5, 1998.

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Description

In the last 5 years, significant technology advances have been made in the performance, size, and cost of solid-state diode-pumped lasers. These developments enable the use of compact Q-switched Nd:YAG lasers as a beam diagnostic for high current H{sup {minus}} beams. Because the threshold for photodetachment is only 0.75 eV, and the maximum detachment cross section is 4 {times} 10{sup {minus}17} cm{sup 2} at 1.5 eV, a 50 mJ/pulse Q-switched Nd:YAG laser can neutralize a significant fraction of the beam in a single 10-ns wide pulse. The neutral beam maintains nearly identical parameters as the parent H{sup {minus}} beam, including size, divergence, energy, energy spread, and phase spread. A dipole magnet can separate the neutral beam from the H{sup {minus}} beam to allow diagnostics on the neutral beam without intercepting the high-current H{sup {minus}} beam. Such a laser system can also be used to extract a low current proton beam, or to induce fluorescence in partially stripped heavy ion beams. Possible beamline diagnostic systems will be reviewed, and the neutral beam yields will be calculated.

Physical Description

8 p.

Notes

INIS; OSTI as DE99001261

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  • Other Information: PBD: 5 May 1998

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  • Other: DE99001261
  • Report No.: LA-UR--98-2643
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/304131 | External Link
  • Office of Scientific & Technical Information Report Number: 304131
  • Archival Resource Key: ark:/67531/metadc682537

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Creation Date

  • May 5, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 5, 2016, 6:29 p.m.

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Shafer, R.E. Laser diagnostic for high current H{sup {minus}} beams, report, May 5, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc682537/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.