Filamentless operation of a 10 kW electron bombardment vacuum furnace in the temperature range 2000–3000 K is described. This novel mode of operation was useful in obtaining low magnetic field ambient around the furnace. This enabled us to carry out sensitive measurement of atomic properties of refractory metal atoms with the help of well-collimated neutral atomic beams. In this furnace, the necessary electron emission was derived from the innermost heat shield, which was coated with a low work-function metal and placed closer to the boat to attain high enough temperatures. The destabilizing effect of high degree of electrothermal feedback was effectively countered by using a nonlinear ballast consisting of a bank of tungsten lamps. The ionized fraction in the atomic beam was removed with the help of biased grids. This furnace has provided uninterrupted service to many users over the last few years.
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August 2000
Research Article|
August 01 2000
Filamentless operation of a high-power electron bombardment furnace used for refractory metals atom beam generation Available to Purchase
M. S. Bhatia;
M. S. Bhatia
Laser and Plasma Technology Division, Bhabha Atomic Research Center, Mumbai 400 085, India
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A. S. Dongare;
A. S. Dongare
Laser and Plasma Technology Division, Bhabha Atomic Research Center, Mumbai 400 085, India
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V. K. Mago;
V. K. Mago
Laser and Plasma Technology Division, Bhabha Atomic Research Center, Mumbai 400 085, India
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B. Lal
B. Lal
Laser and Plasma Technology Division, Bhabha Atomic Research Center, Mumbai 400 085, India
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M. S. Bhatia
Laser and Plasma Technology Division, Bhabha Atomic Research Center, Mumbai 400 085, India
A. S. Dongare
Laser and Plasma Technology Division, Bhabha Atomic Research Center, Mumbai 400 085, India
V. K. Mago
Laser and Plasma Technology Division, Bhabha Atomic Research Center, Mumbai 400 085, India
B. Lal
Laser and Plasma Technology Division, Bhabha Atomic Research Center, Mumbai 400 085, India
Rev. Sci. Instrum. 71, 3031–3036 (2000)
Article history
Received:
November 30 1999
Accepted:
May 15 2000
Citation
M. S. Bhatia, A. S. Dongare, V. K. Mago, B. Lal; Filamentless operation of a high-power electron bombardment furnace used for refractory metals atom beam generation. Rev. Sci. Instrum. 1 August 2000; 71 (8): 3031–3036. https://doi.org/10.1063/1.1305813
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