JPS5848337A - Oven structure of atom beam tube - Google Patents

Abstract

PURPOSE:To prevent any breakage of a glass ampoule which might be caused due to thermal stress, and enable the glass ampoule to be used as a metal charging ampoule by providing an ampoule-protection network member around the glass ampoule. CONSTITUTION:A lid member 9 is brazed to the upper end of an outer cylinder 8 of an cylindrical oven. An ampoule base 12 made of copper or the like which has a high heat transfer rate is fixed to the lower part of the lid member 9, so that the lower end of the base 12 supports a glass ampoule 13 at a given position. Besides, the base 12 presses and supports the ampoule 13 from above when the sealing of the ampoule 13 is broken by pressing the bottom of the ampoule 13 by means of a pressing member 16. A network 14 prepared by weaving a metallic wire member made of Ni or the like is provided around the ampoule 13 so that the entire surface of the ampoule 13 except its top part and central bottom part is covered with the network 14. Owing to the above structure, any breakage of the ampoule 13 which might be caused due to thermal stress can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a single-bun structure for generating an atomic beam in an atomic beam tube.

In order to stably generate the frequency from an oscillation source such as ink ink in a frequency oscillator, the reference frequency from the crystal is multiplied and the transposition leakage number of the tM beam is 1? In comparison, the oscillation source is under feedback control. As shown in Figure 1, the atomic beam tube for generating atomic beams such as ζ0 consists of a waveguide that maintains a high vacuum inside and introduces O-multiplied frequency from a crystal into a vacuum envelope 1. Resonator 2, deflection magnet 5.4,
An atomic beam generation oven 5 that irradiates atomic beams in the direction indicated by the arrow, and a detector 6 [arranged]. The atomic beam generation bun has a collimator with an atomic beam irradiation port at one end of an open outer cylinder made of a cylindrical material, and the other end is sealed with a diaphragm equipped with a suppressing member for opening the ampoule. An ampoule containing metal for generation is housed in the open outer cylinder. When enclosing metal atoms in this metal tube ampoule for atomic beam generation, it is easy to use a glass ampoule, evacuate it with a vacuum distillation device, and enclose the metal atoms at the same time.It is also easy to quantify the amount enclosed, and it is easy to manufacture. It is advantageous in terms of The atomic beam tube is operated at extremely high vacuum (below 1×10 torr). In order to obtain such a high degree of vacuum, the inside of the vacuum envelope is once heated to a high temperature of 400° C. and evacuated. The glass ampoule may be damaged due to thermal stress during the exhaust firing or one-time assembly process of such an atomic beam tube. For this reason, conventionally, a metal ampoule or an ampoule with a double structure of metal and glass O was used instead of a glass ampoule.

However, such ampules have a complicated structure, are not easy to manufacture, and are disadvantageous in terms of cost.

The present invention was made in view of the above points, and the object of the present invention is to provide an oven structure that prevents damage to the glass ampoule due to thermal stress and allows the use of a glass angle as an ampoule for enclosing metal for atomic beam generation. . In the present invention, a mesh material for protecting the ampoule is provided around the glass ampoule.

FIG. 2 is a sectional view of one embodiment of the oven structure of the atomic beam tube according to the present invention. Oven outer cylinder 8 made of cylindrical material
A lid member 9 is brazed to the upper end of.

A number of support rods 1 are attached to the lid 9 for fixing the oven 5 within the vacuum envelope of the atomic beam tube. The entire top of the support rod 7 is fixed by screws or the like through the bent portion of the upper end of each support rod 7. A collimator 10 having a passage 17 for imparting directionality to the atomic beads is provided on the lid 9, and 11 is a heater for keeping the collimator 10'l at a predetermined temperature. The lower end of the spring outer cylinder 8 is sealed with a diaphragm 15. A round suppressing member 14 for opening the first glass ampoule is attached to the center of this diaphragm 15 (D). An ampoule base 12 made of copper or the like having a high heat transfer coefficient is fixed to the lower part of the lid member 90, and its lower end is a glass angle. The glass ampoule 15t is held in a predetermined position in contact with the shoulder of the glass ampoule 1s!!, and the glass ampoule 1!! is pressed from below by the suppressing member 16 to break it.
When opening the glass ampoule 13t, press and support it from above. Around the glass ampoule 1s, a mesh material 14 made of woven metal wire such as nickel is provided. This mesh material 14 covers the entire periphery of the glass ampoule 1s except for the top and bottom central unsealed parts, so that thermal effects on the glass ampoule that are applied from the outside via the ampoule base or the open outer tube are not applied to the glass ampoule metal body. Since it is almost uniformly distributed, there is no localized thermal stress and there is no risk of breakage of the glass ampoule at high temperatures. t+
, this mesh material 14F! It plays the role of transporting the molten body of atomic beam generating metal (not shown) such as metal cesium that is peeked inside the glass ampoule when it is opened, to the upper part by capillary action, and also serves as a mechanical protector against impact etc. It also has effects.

As explained above, in the oven structure of the atomic beam tube according to the present invention, almost the entire circumference of the nine ampoules that house the metal tube for J-son beam generation is covered with a metal V-shield (wire material). The ampoule is thermally and mechanically protected from the outside world. Therefore, even if a glass ampoule is used as an ampoule, the glass ampoule will not be damaged by the heat of the ampoule assembly worker or the exhaust firing of the atomic beam tube. The cost will be 1% in terms of cost.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an atomic beam tube to which the present invention is applied, and FIG. 2 is a sectional view of an atomic beam generation opening according to the present invention. 8...Supun outer cylinder, 10...Collimator,
12...Ampoule base, 1s...Glass ampoule, 14...Fist/mesh material, 1s...
-Diaphragm, 16...pressing member. Patent applicant: Fujitsu Corporation Nippon Telegraph and Telephone Public Corporation Patent agent: Akira Aoki, patent attorney Kazuyuki Nishidate, patent attorney (1) Yukio, patent attorney: Akira Yamaguchi

Claims (1)

[Claims] A collimator with an atomic beam irradiation port is installed at one end of the T-punn outer cylinder made of a cylindrical material, and the other end is equipped with a pressing member for opening the glass ampoule, sealed with a 9 diaphragm, and a metal for atomic beam generation is installed at the other end. An atomic beam tube with a single-open structure in which a sealed glass ampoule is housed in the above-mentioned outer cylinder, characterized in that a mesh material for protecting the ampoule is provided around the glass ampoule.
T-Pun structure.