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Local supply of gas in vacuum: Application to a field ion sourcea)
a)No corrections received from author prior to publication.
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10.1116/1.2968689
/content/avs/journal/jvsta/26/5/10.1116/1.2968689
http://aip.metastore.ingenta.com/content/avs/journal/jvsta/26/5/10.1116/1.2968689

Figures

Image of FIG. 1.
FIG. 1.

Experimental arrangement: gas flows from the high pressure chamber to the low pressure chamber via the coaxial structure of the ion source. The gas supply has to be large at the field emitter apex to maximize ionization rate. It has to be localized for a free propagation of the ion beam inside the chamber.

Image of FIG. 2.
FIG. 2.

Pressure in the low pressure chamber (left) vs pressure in the high pressure chamber. The right vertical axis is the estimated local pressure at the tip level for nitrogen; for hydrogen and helium this pressure scales like the square root of the molecular mass. The upward arrows show the transition from the molecular regime to the viscous regime, the downward arrows the transition from the viscous regime to the exit loss regime (see text for details).

Image of FIG. 3.
FIG. 3.

Conductance of the structure from pressure measurements of Fig. 2 assuming pumping speed values (Varian data) reported on the left of the figure.

Image of FIG. 4.
FIG. 4.

Pressure in the low pressure chamber (left) vs pressure in the high pressure chamber for at room temperature and at low temperature (cold). The arrows show the transition from molecular regime to viscous regime.

Image of FIG. 5.
FIG. 5.

Conductance of the structure for at room temperature and at low temperature (cold) from pressure measurements of Fig. 4 .

Tables

Generic image for table
TABLE I.

Theoretical (theor.) and experimental (expt.) conductances in the molecular regime and in the viscous regime for different gases; is the transition pressure from the molecular regime to the viscous regime.

Generic image for table
TABLE II.

Theoretical (theor.) and experimental (expt.) high pressure (exit loss) conductance and corresponding orifice coefficient for different gases. is the transition pressure from the viscous regime to the exit loss regime.

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/content/avs/journal/jvsta/26/5/10.1116/1.2968689
2008-08-28
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Local supply of gas in vacuum: Application to a field ion sourcea)
http://aip.metastore.ingenta.com/content/avs/journal/jvsta/26/5/10.1116/1.2968689
10.1116/1.2968689
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