Doppler-shifted neutral beam line shape and beam transmission

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Analysis of Doppler-shifted Balmer-{alpha} line emission from the TFTR neutral beam injection systems has revealed that the line shape is well approximated by the sum of two Gaussians, or, alternatively, by a Lorentzian. For the sum of two Gaussians, the broad portion of the distribution contains 40% of the beam power and has a divergence five times that of the narrow part. Assuming a narrow 1/e- divergence of 1.3{degrees} (based on fits to the beam shape on the calorimeter), the broad part has a divergence of 6.9{degrees}. The entire line shape is also well approximated by a Lorentzian with a ... continued below

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35 p.

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Kamperschroer, J. H.; Grisham, L. R.; Kokatnur, N.; Lagin, L. J.; Newman, R. A.; O`Connor, T. E. et al. April 1, 1994.

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Description

Analysis of Doppler-shifted Balmer-{alpha} line emission from the TFTR neutral beam injection systems has revealed that the line shape is well approximated by the sum of two Gaussians, or, alternatively, by a Lorentzian. For the sum of two Gaussians, the broad portion of the distribution contains 40% of the beam power and has a divergence five times that of the narrow part. Assuming a narrow 1/e- divergence of 1.3{degrees} (based on fits to the beam shape on the calorimeter), the broad part has a divergence of 6.9{degrees}. The entire line shape is also well approximated by a Lorentzian with a half-maximum divergence of 0.9{degrees}. Up to now, fusion neutral beam modelers have assumed a single Gaussian velocity distribution, at the extraction plane, in each direction perpendicular to beam propagation. This predicts a beam transmission efficiency from the ion source to the calorimeter of 97%. Waterflow calorimetry data, however, yield a transmission efficiency of {approximately}75%, a value in rough agreement with predictions of the Gaussian or Lorentzian models presented here. The broad wing of the two Gaussian distribution also accurately predicts the loss in the neutralizer. An average angle of incidence for beam loss at the exit of the neutralizer is 2.2{degrees}, rather than the 4.95{degrees} subtended by the center of the ion source. This average angle of incidence, which is used in computing power densities on collimators, is shown to be a function of beam divergence.

Physical Description

35 p.

Notes

INIS; OSTI as DE94009830; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

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  • Other Information: PBD: Apr 1994

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  • Other: DE94009830
  • Report No.: PPPL--2981
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/10141664 | External Link
  • Office of Scientific & Technical Information Report Number: 10141664
  • Archival Resource Key: ark:/67531/metadc1316301

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Creation Date

  • April 1, 1994

Added to The UNT Digital Library

  • Nov. 3, 2018, 11:47 a.m.

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  • Nov. 15, 2018, 10:43 p.m.

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Kamperschroer, J. H.; Grisham, L. R.; Kokatnur, N.; Lagin, L. J.; Newman, R. A.; O`Connor, T. E. et al. Doppler-shifted neutral beam line shape and beam transmission, report, April 1, 1994; New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc1316301/: accessed May 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.