NDLI: Investigation of collisional effects within the bending magnet region of a DIII-D neutral beamline

Content Provider	IEEE Xplore Digital Library
Author	Kessler, D.N. Hong, R. Kellman, D.H.
Copyright Year	1993
Description	Author affiliation: Gen. Atomics, San Diego, CA, USA (Kessler, D.N.; Hong, R.; Kellman, D.H.)
Abstract	The region between the pole faces of the DIII-D neutral beamline residual ion bending magnets is an area of transient high gas pressure which may cause beam defocusing and increased heating of beamline internal components due to collisional effects. An investigation of these effects helps in understanding residual ion trajectories and in providing information for studying the beamline capability for operation with increased pulse duration. Examination of collisional effects, and of the possible existence of space charge blow-up, was carried out by injecting deuterium gas into the region between the magnet pole faces with rates varying from 9 to 18 torr-l/sec. Thermocouple and waterflow calorimetry data were taken to measure the beamline component heating and beam power deposition on the magnet pole shields, magnet louvers, ion dump, beam collimators, and calorimeter. Data was also taken at gas flow rates varying from 0 to 25 torr-l/sec into the neutralizer cell and is compared with the magnet region gas injection data obtained. Results show that both collisional effects and space charge blow-up play a role in magnet region component heating and that neutralizer gas flow sufficiently reduces component heating without incurring unacceptable power losses through collisional effects.
Starting Page	427
Ending Page	430
File Size	392394
Page Count	4
File Format	PDF
ISBN	0780314123
DOI	10.1109/FUSION.1993.518364
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-10-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic shielding Space charge Fluid flow Space heating Deuterium Calorimetry Power measurement Water heating Ion beams Collimators
Content Type	Text
Resource Type	Article

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Investigation of collisional effects within the bending magnet region of a DIII-D neutral beamline

Benchmark testing of DIII-D neutral beam modeling with water flow calorimetry

Investigation of the heat handling capabilities of DIII-D neutral beamline internal components

Development for extending the beam pulse length of the DIII-D neutral besm System

Analysis of DIII-D upgraded neutral beamline bending magnet thermal shields

Fabrication of New Magnet Pole Shields for the 80 keV Neutral Beam Lines for DIII-D

Beam species mix as a function of DIII-D neutral beam ion source operation parameters

Dissolved oxygen reduction in the DIII-D neutral beam ion source cooling system

Calculated beam profiles for the DIII-D off-axis and long pulse neutral beam upgrade

Investigation of collisional effects within the bending magnet region of a DIII-D neutral beamline

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Investigation of collisional effects within the bending magnet region of a DIII-D neutral beamline

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