JPS61258531A - Atom beam device - Google Patents

Abstract

PURPOSE:To prevent the flowing of liquidified Cs to the outside of an atom beam radiation part through a collimator by providing penetratingly a thin tube flowing a beam source vapor to the minute pierced part of a barrier plate between a beam source storage part and an atom beam radiation part in a form that both ends are projected respectively from the face of the barrier. CONSTITUTION:A barrier plate 25 is provided between the beam source storage pat 24 and the atom beam radiation part 29 and the thin tube 41 through which the beam source vapor flows is provided penetratingly to the minute hole pierced part of the barrier plate 25 in a form that both ends are projected respectively from the said barrier wall face. In flowing the Cs in the said Cs ample 21 liquidified by the heat conduction from the atom beam radiation section 29 into the beam source storage part 24, the liquidified Cs is vaporized by the barrier plate 25 heated by the heater 27 of the heat part 29. The Cs vapor passes in the flowing thin tube 41 provided penetrated in a form to be projected to the said barrier plate 25 and is radiated through the collimator 28 as the Cs atom beam 33 to the cavity resonator. Thus, it is prevented that the liquidified Cs 22 flows into the tube 41 due to vibration or shock.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a cesium atomic beam device used in a frequency standard, in which a partition plate is provided between a beam source housing section and an atomic beam emitting section in an atomic beam generating reactor in the device. A thin tube through which the beam source vapor flows is installed in the perforated part of the pores with both ends protruding from the surface of the partition plate, and the device can be operated at an environmental temperature of 28°C or higher where cesium (Cs) liquefies. The protruding thin tube provided on the bulkhead plate prevents the inconvenience that cesium liquefied inside the beam source housing unit due to vibrations, etc., may inadvertently flow out of the atomic beam radiating unit through the collimation of the atomic beam radiating unit during moving operations or transportation. The aim is to prevent this and stabilize performance.

[Industrial application field]

The present invention relates to the improvement of a cesium atomic beam device used as the heart of a frequency standard, and in particular, the present invention relates to the improvement of a cesium atomic beam device used as the heart of a frequency standard, and in particular, when the device is moved at an external environmental temperature where cesium liquefies, or when transported, etc., the device is housed in a beam source of an atomic beam generating reactor. This invention relates to a structure that prevents liquefied cesium from inadvertently flowing out of the atomic beam emitting section through a collimator due to vibrations, shocks, etc.

An atomic beam device using cesium (Cs) is an ultra-highly stable oscillator that utilizes the permanent invariance of the resonance frequency of Cs atoms, and is widely used in fields such as precision measurement, navigation, and communication. It has been adopted as the core of frequency standards, and various types have already been proposed.

Figure 3 is a schematic diagram of the Cs atomic beam device.
For example, an ampoule filled with Cs stored in a beam source housing part in the beam generation furnace 1 is opened, and the Cs is heated to about 100°C by a heater to generate steam, and this magnetism is transferred to the atomic beam radiation part. The Gs atoms are emitted as a Gs atomic beam 3 through a collimator 2.

The Cs atoms are selected by the A deflection magnet 4 to a predetermined energy level 1 of the ultrafine structure, and are placed in the high frequency transition part, that is, the U-shaped microwave cavity 5, placed in the C magnetic field. When passing through the Cs atom, resonance occurs and the Cs atom undergoes a transition while the frequency of the high-frequency magnetic field in the cavity resonator 5 is equal to the transition frequency between predetermined energy levels of the hyperfine structure of the Cs atom. . 6 is a magnetic shield.

The CS atomic beam that has undergone this transition is sorted by the B deflection grinder 7, further detected by the detector 8, and a detection signal proportional to the number of detected atoms is output to an external path 111.

Cs used in such an atomic beam device is 28
It has the property of liquefying at temperatures below 11°C, and it easily liquefies at outside ambient temperatures such as in the summer, and in such environments/□11° As a result, this liquid Cs inadvertently flows out through the collimator 2 to the atomic beam emitting section (i.e., Cs beam emitting section 41: reactor 1),
Due to this, there is a problem that the detection signal of the subsequent operation fluctuates greatly or the life of the device is shortened, and it is desired to prevent such inconveniences.

[Conventional technology]

The Cs beam generation of the above-mentioned atomic beam device 1 is generally a beam source in which an ampoule 2I filled with cesium (Cs) 22 is housed with a nickel (Ni) mesh 23 interposed therebetween, as shown in FIG. A heater 27 that generates the beam m vapor through the storage section 24 and the partition plate 25 in which the beam source storage section 24 has a pore 26 and the Cs
It consists of an atomic beam radiating section 29 equipped with a collimator that emits atomic energy in the form of a beam.

Note that 32 is an opening tool provided in the outer tube 31, and when the device is operated, the opening tool 32 is mechanically pushed to break the Cs ampoule 21 through the partition plate 30 and open it. Then, the liquefied Cs22 in the Cs ampoule 2 is caused to flow into the beam source accommodating part 24 by heat conduction from the atomic beam radiating part 29. This Cs22 is further
The Cs atomic beam 33 is vaporized by the partition plate 25 and collimator 28 heated by the heater 27 of 9, and is radiated from the collimator 28 through the pores 26 of the partition plate 25 as a Cs atomic beam 33 toward a cavity resonator (not shown).

[Problem that the invention seeks to solve]

By the way, as mentioned above, Cs22, which is unsealed and stored in the Cs beam generation reactor of the atomic beam device, has the property of liquefying at a temperature of 28°C or higher, and the atomic beam device cannot be used in the summer when the ambient temperature is like this. When moving or transporting Cs22, since the stored Cs22 is naturally liquefied, it may accidentally pass through the pores 26 of the partition plate 25 and the collimator 28 due to vibrations, shocks, etc. during the transport. This results in the inconvenience that the atomic beam flows out of the atomic beam emitting section 29.

Further, due to such inconveniences, there is a drawback that the detection signal during subsequent operation is greatly fluctuated, and as a result, the life of the device is shortened.

The present invention improves the pore 26 portion of the partition plate 25 disposed between the beam source accommodating section 24 and the atomic beam radiating section 29 in the Cs beam generating reactor in view of the conventional situation described in section 2. C
When moving or transporting the device at the above external environmental temperature, the liquefied C inside the beam source housing section 24
It is an object of the present invention to provide a novel atomic beam device that prevents the inconvenience of s22 inadvertently flowing out from the atomic beam emitting section 29 from the partition plate 25 through the collimator 26.

[Means for solving problems]

In order to achieve the L1 objective of -1-, the present invention has a partition plate between the beam source accommodating part 24 and the atomic beam emitting part 29 that constitute the atomic beam generating reactor in the atomic beam apparatus, as shown in FIG. A thin tube 4 through which the beam rA stem air flows is inserted through the perforated portion of No. 25 with both ends projecting from the surface of the partition plate, and the liquefied Cs is
22 moves the collimator 28 to the atomic beam emitting section 29
It is constructed so that it cannot be easily leaked out.

[For production]

In the atomic beam device configured in this way, 28
At night above °C (beam source housing 2
The CS22 liquefied in the partition wall plate 25 is prevented from easily passing through by the structure of the protruding flow tube 1JI) formed through the partition wall plate 25, and is prevented from easily passing through due to vibrations during moving operations or transportation, or f! i! ! ' etc., it becomes possible to prevent the liquefied fertilizer Cs22 from inadvertently flowing out of the atomic beam emitting section 29 through the collimator 26.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of essential parts showing an embodiment of an atomic beam generating reactor included in an atomic beam apparatus according to the present invention.

In the figure, reference numeral 24 indicates an ampoule 21 filled with cesium (Cs) 22, for example, a nickel (Ni) mesh 23.
29 is an atomic beam radiating section equipped with a heater 27 for generating beam source vapor and a collimator 28 for emitting the C5 energy in a beam shape. The configuration up to now is the same as before.

A partition plate 25 is disposed between the beam source accommodating part 24 and the atomic beam emitting part 29 having such a configuration, and both α114 are attached to the perforated part of the partition plate 25, respectively. A thin tube 41 through which the beam source rough air flows through a shape that protrudes from the plate surface.
is installed through it.

Now, in an atomic beam generating reactor with this kind of structure,
As in the conventional case, the opening tool 32 is mechanically pushed in and the C.
When the S ampoule 21 is broken through the partition plate 30 and unsealed, and the Cs in the Cs ampoule 21, which has been liquefied by heat conduction from the atomic beam emitting section 29, flows out into the beam source housing section 24, this liquefied Cs is vaporized by the partition plate 25 heated by the heater 27 in the radiation section 29, and this Cs vapor passes through the flow tube 41 projecting through the partition plate 25, and then passes through the collimator. 28 and can be radiated as a Cs atomic beam 33 to a cavity resonator (not shown).

On the other hand, in this way, the Cs
22 is stored in an unsealed state, the Cs
When carrying out a moving operation or transportation under an external environmental temperature where Cs22 is liquefied, the liquefied Cs2
Since it is difficult for Cs22 to flow into the thin tube 41 due to vibrations, shocks, etc., the liquefied Cs22
is prevented from flowing out to the collimator 26 side. Therefore, the atomic beam device can be easily handled without being restricted by external environmental temperature or the like.

In addition, in the embodiments described above, an example in which a single flow pipe 171 is installed through the partition plate has been illustrated and explained, but the present invention is not limited to this example, and modifications can be made as necessary. A plurality of flow tubes may be provided through the tube, and the same effect can be obtained in this case as well.

〔Effect of the invention〕

As is clear from the above explanation, according to the atomic beam apparatus according to the present invention, the configuration of the flow pipe 41 projecting through the partition plate in the atomic beam generation reactor allows for This prevents liquefied Cs from inadvertently flowing out of the atomic beam emitting section from the beam source housing section due to movement operations under the external environmental temperature where Cs liquefies, vibrations and shocks during transportation, and improves the performance of the device. Along with stabilizing
It has excellent practical effects, such as improved handling in moving operations and transportation.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of an atomic beam generator in an atomic beam apparatus according to the present invention, and FIG. 2 is a main part for explaining an atomic beam generator in a conventional atomic beam apparatus. The sectional view and FIG. 3 are diagrams for explaining the schematic configuration of the atomic beam device. In FIG. 1, 21 is a C, s ampoule, 22 is cesium, 24 is a beam source housing part, 25 is a partition plate, 27 is a gf heater, 28
29 is a collimator, 29 is an atomic beam radiation part, 33 is an atomic beam, and 41 is a flow 1ffl thin tube. A, awn, B, moon, 77 bodies, sun, and moon, J) Venerable p times-j, Koma, U, 1st figure, subordinate illusion, explanation 1) Handshake, Mengukuni, 2nd figure

Claims (1)

[Claims] A partition plate (2) with a hole bored in the beam source housing part (24)
5) an atomic beam generation reactor including an atomic beam radiator (29) having a collimator (28) that generates beam source steam and radiates the steam in the form of a beam, and a resonator; A partition plate between the beam source accommodating part (24) and the atomic beam emitting part (29) in the atomic beam generating reactor, in a configuration comprising a detection part for detecting resonance of atoms in the emitted atomic beam (33). An atomic beam device characterized in that a thin tube (41) through which beam source vapor flows is provided in the perforated portion of (25) with both ends protruding from the surface of the partition plate.