CN103077799A - Passive hydrogen clock ultra-uniform C-field magnetic cylinder and manufacturing method thereof - Google Patents

Abstract

The invention discloses a passive hydrogen clock ultra-uniform C-field magnetic cylinder and a manufacturing method thereof. The C-field magnetic cylinder disclosed by the invention comprises a magnetic cylinder framework and field coils, wherein the field coils are wound on the outer side of the cylindrical magnetic cylinder framework, have a magnetic field uniformity compensation effect and are symmetrically distributed about a center point; and a layer of enamel wires of the coils is tightly wound on the surface of the magnetic cylinder. By virtue of changing the wire diameter of the enamel wire, the winding of coils of different densities can be realized, and the density of the coils can be increased without laminated winding; and the densities of the coils at the parts, have distances of L/16 with positions L/8 away from the center, of two ends of the cylindrical magnetic cylinder are greater than the standard density for 2 times and 4 times respectively, and L is the total coil length. The coil parameters of the C-field magnetic cylinder are subjected to optimal design and selection, so that the error of the magnetic field uniformity on the inner axis of a foam storage spatial region can be less than 0.2%, and the error of the uniformity in the whole space can be less than 0.5%, so that the requirement of a driven hydrogen clock on the ultra-uniformity of a C field can be met.

Description

The super even C of a kind of passive hydrogen clock field magnetic cylinder and preparation method thereof

Technical field

The invention belongs to the development field of passive hydrogen clock physical unit, be specifically related to the super even C of a kind of passive hydrogen clock field magnetic cylinder.

Background technology

Passive hydrogen clock is widely used in the fields such as satellite navigation, space exploration and time service, for it provides standard time, frequency standard.The ultrastability microwave quantum frequency discriminator that passive hydrogen clock uses ground state hydrogen atom hyperfine structure energy level transition to produce, locking VCXO (VCXO) is so that VCXO can stablize and the outputting standard frequency signal.The C field coil is the critical component of passive hydrogen clock, for generation of the magnetostatic field consistent with the microwave resonance magnetic direction in whole storing hydrogen bubble zone.Magnetostatic field produces three hyperfine structure energy levels so that division occurs the energy level of ground state hydrogen atom F=1, and this effect is called as Zeemen effect, and magnetostatic field is also referred to as Zeeman field or C field.In addition, the C field also provides the quantization direction for the hyperfine structure energy level transition, so that │ F=1, m _F=0 〉-and │ F=0, m _F=0〉transition (σ transition) is achieved, and the jump frequency of two energy states is

v＝v ₀+KB ²,(1)

Wherein, υ ₀It is the jump frequency without hydrogen atom in the situation of magnetic field; B is the magnetic induction in Zeeman magnetic field; K=2.7730 * 10 ¹¹H/T ²The size of C field magnetic induction and the uniformity (gradient) affect the accuracy of jump frequency, the signal to noise ratio of signal, the live width of vibration spectral line, so the uniformity of C field is one of key factor that determines quantum frequency discriminator spectral line quality.In order to design live width less than the quantum frequency discriminator of the high-quality passive hydrogen clock of 2Hz, the relative evenness errors of C field must be controlled in 1% in hydrogen atom stores the bubble area of space, and magnetic induction is enough little.

At present, in the passive hydrogen clock development process, the design of C field coil and machining accuracy do not reach the uniformity of requirement far away, often adopt medium setoff or increasing magnetic cylinder volume to realize, so just limit the raising of passive hydrogen clock stability, also be unfavorable for realizing miniaturization, become the bottleneck in the passive hydrogen clock development.

Therefore, need the super even C of a kind of new passive hydrogen clock field magnetic cylinder to address the above problem.

Summary of the invention

Goal of the invention: the present invention is directed to prior art in the passive hydrogen clock development process, the design of C field coil and the defective of machining accuracy provide the super even C of a kind of passive hydrogen clock field magnetic cylinder.

Technical scheme: for solving the problems of the technologies described above, the super even C of passive hydrogen clock of the present invention field magnetic cylinder adopts following technical scheme:

The super uniformity C of a kind of passive hydrogen clock field magnetic cylinder, comprise magnetic cylinder skeleton and field coil, described magnetic cylinder skeleton is cylindrical shape, described field coil is wrapped in the outside of described magnetic cylinder skeleton, begin the described field coil of successively coiling from an end of described magnetic cylinder skeleton: adopt first the enamelled wire of d/4 wire diameter at the field coil of described magnetic cylinder skeleton surface coiling L/16 length, adopt again the enamelled wire of d wire diameter at the field coil of described magnetic cylinder skeleton surface coiling L/4 length, adopt again the enamelled wire of d/2 wire diameter at the field coil of described magnetic cylinder skeleton surface coiling L/16 length, adopt again the enamelled wire of d wire diameter at the field coil of described magnetic cylinder skeleton surface coiling L/4 length, adopt again the enamelled wire of d/2 wire diameter at the field coil of described magnetic cylinder skeleton surface coiling L/16 length, adopt again the enamelled wire of d wire diameter at the field coil of described magnetic cylinder skeleton surface coiling L/4 length, adopt again the enamelled wire of d/4 wire diameter at the field coil of described magnetic cylinder skeleton surface coiling L/16 length, wherein, d is the standard wire diameter, and L is the length of described magnetic cylinder skeleton.

Inventive principle: be provided with magnetron in the magnetic cylinder of C field and store bubble, it is inner that magnetron is arranged on the magnetic cylinder skeleton, stores bubble and be arranged in the magnetron.Coil has the uniformity of magnetic field compensating action, the coil on cylinder surface, magnetic field is symmetric about mid point, the enamelled wire of coil is at the tight coiling one deck in magnetic cylinder surface, realize the coiling of the coil of different densities by the wire diameter that changes enamelled wire, and need not to increase by the lamination coiling density of coil, it is original 2 times and 4 times at the two ends of cylindrical magnetic cylinder with apart from L/16 length (L is the coil total length) the interior loop increase in density at center L/8 place, so that the uniformity of magnetic field in the whole storage bubble is improved.

Beneficial effect: the coil parameter of the C field magnetic cylinder that the present invention proposes is chosen through optimal design, uniformity of magnetic field error in storing the bubble area of space on the axis can reach below 2 ‰, and evenness errors can less than 5 ‰, satisfy passive hydrogen clock to the super uniformity requirement of C field in the whole space.

Further, the coiling coiling that described field coil is formed by the enamelled wire termination of a different radii from the beginning to the end forms, and described field coil only has two terminals.The different densities of coil is realized by the enamelled wire termination that adopts different radii, field coil is formed by a coiling coiling from the beginning to the end, and two terminals are only arranged, access a current source and just can produce super uniformity C field, avoided a plurality of the end of a thread wire currents on the impact in magnetic field.

Further, the thickness of described magnetic cylinder skeleton is of value to the weight that alleviates C field magnetic cylinder less than or equal to 1mm, utilizes the hydrogen clock miniaturization.

Further, described magnetic cylinder skeleton is made by magnetic-permeable material.

Further, described magnetic-permeable material is aluminium or titanium.

The invention also discloses the manufacture method of the super uniformity C of above-mentioned passive hydrogen clock field magnetic cylinder.

The manufacture method of the super uniformity C of a kind of passive hydrogen clock field magnetic cylinder may further comprise the steps:

(1) adopt magnetic-permeable material to be curled into cylindrical shape, then with the seam welding, polish, polish at the butt welded seam place again, obtains columnar magnetic cylinder skeleton;

(2) end from the magnetic cylinder skeleton begins successively coiling field coil: adopt first the enamelled wire of d/4 wire diameter at magnetic cylinder skeleton surface coiling L/16 length coil, adopt again the enamelled wire coiling L/4 length coil of d wire diameter, adopt again the enamelled wire coiling L/16 length coil of d/2 wire diameter, adopt again the enamelled wire coiling L/4 length coil of d wire diameter, adopt again the enamelled wire of d/2 wire diameter at magnetic cylinder skeleton surface coiling L/16 length coil, adopt again the enamelled wire coiling L/4 length coil of d wire diameter, adopt again the enamelled wire coiling L/16 length coil of d/4 wire diameter, wherein, d is the standard wire diameter, and L is the length of magnetic cylinder skeleton.

Further, the thickness of described magnetic cylinder skeleton is less than or equal to 1mm.

Further, described magnetic-permeable material is aluminium or titanium.

Beneficial effect: utilize the parameter of the C field magnetic cylinder that the manufacture method of the super uniformity C of passive hydrogen clock of the present invention field magnetic cylinder makes to choose through optimal design, uniformity of magnetic field error in storing the bubble area of space on the axis can reach below 2 ‰, and evenness errors can less than 5 ‰, satisfy passive hydrogen clock to the super uniformity requirement of C field in the whole space.

Description of drawings

The mounting structure schematic diagram of Fig. 1, the super even C of passive hydrogen clock of the present invention field magnetic cylinder;

The parameter of Fig. 2, bucking coil is through storing the distribution curve in axis magnetic field in the bubble after the optimized design;

The parameter of Fig. 3, bucking coil distributes through the uniformity of magnetic field in the whole storage bubble space after the optimized design;

Fig. 4, magnetic cylinder coil-winding distribution schematic diagram;

Fig. 5, coiling termination mode and size schematic diagram.

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.

See also shown in Figure 1ly, the storage of hydrogen clock bubble 3 is installed in the tube chamber of magnetron 2, and that magnetic cylinder skeleton 1 is installed in magnetron 2 chambeies is peripheral, is created in and stores super uniform Zeeman magnetic field in the bubble area of space.Magnetic cylinder skeleton 1 is cylindrical shape.Magnetic cylinder skeleton 1 is made by saturating magnetic base material (aluminium, titanium etc.), and its thickness is less than 1mm, and field coil is wound on the outer surface of magnetic cylinder skeleton, and its mounting structure as shown in Figure 1.Solenoid coil is the basic element of character (main coil) of C field coil, in order to design the uniform C of excess of export field, must calculate the Distribution of Magnetic Field of solenoid coil inside accurate quantification.According to the Biot-Savart theorem, the electric current infinitesimal in a vacuum magnetic induction of arbitrary some generation can be expressed as

$\mathrm{dB}=\frac{{\mathrm{\&mu;}}_0}{4\mathrm{\&pi;}}\&CenterDot;\frac{\mathrm{Idl}\&times;\mathrm{<figure-callout\; id="3"\; label="r\; r"\; filenames="HDA00002528268000011.png"\; state="\{\{state\}\}">r</figure-callout>}}{r^{}},---\left(2\right)$

Wherein, B is some magnetic induction vector, and r is show up a little distance vector of electric current infinitesimal, and Idl is the electric current infinitesimal, μ ₀Be permeability of vacuum.Ratio Ao-the Sa that is provided by formula (2) cuts down theorem, and the magnetic induction analytic expression that can obtain on the solenoid z axle is

$B\left(z\right)=\frac{{\mathrm{\&mu;}}_0\mathrm{<figure-callout\; id="2"\; label="nI"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">nI</figure-callout>}}{2}\&CenterDot;(\cos {\mathrm{\&theta;}}_2-{\cos \mathrm{\&theta;}}_1)=\frac{{\mathrm{\&mu;}}_0\mathrm{<figure-callout\; id="2"\; label="nI"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">nI</figure-callout>}}{2}\&CenterDot;\{\frac{\frac{L}{2}-z}{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">R</figure-callout>}}^2+{(\frac{L}{2}-z)}^2}}+\frac{\frac{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">L</figure-callout>}}{2}+z}{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">R</figure-callout>}}^2+{(\frac{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">L</figure-callout>}}{2}+z)}^2}}\},---\left(3\right)$

Wherein, ${\cos \mathrm{\&theta;}}_2=\frac{\frac{L}{2}-\mathrm{<figure-callout\; id="2"\; label="z\; R"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">z</figure-callout>}}{\sqrt{R^{}}},$ ${\cos \mathrm{\&theta;}}_1=-\frac{\frac{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">L</figure-callout>}}{2}+\mathrm{<figure-callout\; id="2"\; label="z\; R"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">z</figure-callout>}}{\sqrt{R^{}}},$ N is the coil turn on the cylinder of unit length magnetic field, the density that namely winds the line, and L is loop length, R is the solenoid radius.Because the requirement of passive hydrogen clock miniaturization, the dimensional requirement of its quantum frequency discriminator part is the smaller the better, therefore solenoid can only be the solenoid of finite length L.Calculated as can be known by formula (3), have limit for length's solenoid coil inside from the center to the two ends magnetic induction larger decline to be arranged, and L is less, store the bubble length L _SbThe magnetic strength rate of descent is higher in interval, and the overall uniformity in magnetic field is relatively poor, can not satisfy passive hydrogen clock to storing the requirement of the regional internal magnetic field uniformity of bubble.

In order to improve the uniformity of magnetic field cylinder internal magnetic field, distinguish the bucking coil of coiling symmetrical structure in the symmetric position of solenoid coil.If the length of one group of bucking coil is l ₁, the coiling density of bucking coil is n ₁, just can draw and be in symmetrically z ₁With-z ₁The synthetic analytic expression of the axis magnetic induction that the bucking coil at place produces is

$B_1({\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">n</figure-callout>}}_1,{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1,z)=\frac{{\mathrm{\&mu;}}_0{n}_1\mathrm{<figure-callout\; id="2"\; label="I"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">I</figure-callout>}}{2}\&CenterDot;\{\frac{\frac{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}{2}-\left(z{-z}_1\right)}{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">R</figure-callout>}}^2+{[\frac{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}{2}-(z-z_1)]}^2}}+\frac{\frac{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}{2}+(z-z_1)}{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">R</figure-callout>}}^2+{[\frac{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}{2}+(z-z_1)]}^2}}+\frac{\frac{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}{2}-(z+z_1)}{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">R</figure-callout>}}^2+{[\frac{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}{2}-(z+z_1)]}^2}}+\frac{\frac{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}{2}+(z+z_1)}{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">R</figure-callout>}}^2+{[\frac{{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1}{2}+(z+z_1)]}^2}}\}---\left(4\right)$

Add respectively bucking coil l at the main coil two ends ₁After, although its uniformity makes moderate progress, still can not satisfy passive hydrogen clock to the super uniformity requirement of C field.So, adopt the method for adding a plurality of bucking coils to improve and stored the interior uniformity of magnetic field of bubble area of space to satisfy passive hydrogen clock to the requirement of C field uniformity, namely add bucking coil l at the solenoid coil two ends ₁, l ₂..., l _N(N 〉=2), and l ₁L ₂... l _N, the magnetic field of its generation is respectively B ₁(n ₁, l ₁, z ₁, z), B ₁(n ₂, l ₂, z ₂, z) ..., B ₁(n _N, l _N, z _N, z).Add a plurality of bucking coils and can significantly improve the uniformity on the axis of C field, but coil parameter must the optimised requirement that could satisfy passive hydrogen clock, formula (5) provides a kind of target function of optimization, namely

$\underset{z_{}}{\underset{l_{}}{\underset{{\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">n</figure-callout>}}_1,{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">n</figure-callout>}}_2\&CenterDot;\&CenterDot;\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="n\; N\; l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">n</figure-callout>}}_N}{\mathrm{Min}}}}\left\{\underset{0\&le;z\&le;\frac{L_{\mathrm{sb}}}{2}}{\mathrm{Max}}\frac{\sqrt{{[B_i(n_i,l_i,z_i,z)-\stackrel{\&OverBar;}{B_i(n_i,z_i,l_i)}]}^2}}{\stackrel{\&OverBar;}{B_i(n_i,z_i,l_i)}}\right\},---\left(5\right)$

Wherein,

For z gets

The mean value of the axis magnetic induction in the scope.

The design has added respectively the bucking coil of two groups of equal lengths, i.e. l for the simplicity of magnetic field calculating and coil winding at the two ends of solenoid coil ₁=l ₂, and the coiling density of main coil and two groups of bucking coils satisfies following relation

$n=\frac{n_1}{4}=\frac{n_2}{2},---\left(6\right)$

Value is concerned substitution optimization aim function (5), coil l ₁And l ₂Just can be optimized according to this target function, can obtain a kind of C field coil machined parameters of optimization, namely

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">l</figure-callout>}}_1={\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">l</figure-callout>}}_2=\frac{L}{8}\\ {\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">n</figure-callout>}}_1=4n,{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA00002528268000011.png,HDA00002528268000023.png"\; state="\{\{state\}\}">n</figure-callout>}}_2=2\mathrm{<figure-callout\; id="1"\; label="n\; z"\; filenames="HDA00002528268000011.png,HDA00002528268000012.png"\; state="\{\{state\}\}">n</figure-callout>}& \\ z_{}{}_1=\frac{7}{16}L,z_2=\frac{\mathrm{<figure-callout\; id="8"\; label="L"\; filenames="HDA00002528268000022.png"\; state="\{\{state\}\}">L</figure-callout>}}{8}\end{array}\right..---\left(7\right)$

Figure 2 shows that the length of bucking coil through after the optimized design, z gets

The distribution curve in axis magnetic field in the scope.Calculate as can be known, after optimizing, z gets

Axis uniformity of magnetic field error can reach below 2 ‰ in the scope, data shown in Figure 3 have reflected that whole magnetic field cylinder stores the uniformity of magnetic field in the bubble space, can optimize the uniformity of magnetic field that stores in the bubble area of space according to the data that calculate, its evenness errors reaches the uniformity level of designing requirement less than 5 ‰.

The optimal design parameter that provides according to formula (7), enamelled wire tight coiling one deck from the beginning to the end in the coil processing, and realize the coiling of the coil of different densities by the wire diameter that changes enamelled wire, just can coiling go out to satisfy the coil of passive hydrogen clock C field uniformity requirement, thereby design the C field magnetic cylinder of optimization.

Embodiment 1

The processing of the super even C of passive hydrogen clock of the present invention field magnetic cylinder is divided into two steps: i.e. the coiling of the processing of magnetic cylinder skeleton 1 and field coil.

Magnetic cylinder skeleton 1 skeleton is cylindric, adopts the aluminium sheet of thickness 1mm to be curled into tubular, adopts ac argon arc weld that seam is welded firm, and polish, polish at the butt welded seam place again, so that magnetic cylinder skeleton 1 is and is near the mark cylindricly, makes things convenient for the coiling of coil.

See also shown in Figure 4, the field coil on magnetic cylinder skeleton 1 surface is symmetric about mid point, enamelled wire tight coiling one deck from the beginning to the end in the field coil processing, realize the coiling of the field coil of different densities by the wire diameter that changes enamelled wire, and need not to increase by the lamination coiling density of field coil, it is original 2 times and 4 times at the two ends of magnetic cylinder skeleton 1 with apart from L/16 length (L is the coil total length) the interior loop increase in density at center L/8 place namely, so that the uniformity of magnetic field in the whole storage bubble is improved.Concrete winding method as shown in Figure 4, begin successively coiling from an end of magnetic cylinder: adopt first the enamelled wire of d/4 wire diameter at the tight coiling L/16 length coil in magnetic field cylinder surface, adopt again the enamelled wire coiling L/4 length coil of d wire diameter, adopt again the enamelled wire coiling L/16 length coil of d/2 wire diameter, adopt again the enamelled wire coiling L/4 length coil of d wire diameter, adopt again the enamelled wire of d/2 wire diameter at the tight coiling L/16 length coil in magnetic field cylinder surface, adopt again the enamelled wire coiling L/4 length coil of d wire diameter, adopt again the enamelled wire coiling L/16 length coil of d/4 wire diameter, wherein, d is the standard wire diameter, and L is the length of C field magnetic cylinder.Wherein, the standard wire diameter of enamelled wire is 0.5mm in the present embodiment.

See also shown in Figure 5, the different densities of field coil is realized by the enamelled wire termination that adopts different radii, the coiling coiling that field coil is only formed by the enamelled wire termination of a different radii from the beginning to the end forms, and two terminals are only arranged, access a current source and just can produce super uniformity C field, the concrete termination mode of coiling winds the line altogether as shown in Figure 5 by 7 sections enamelled wire k ₁～k ₇Joining end to end welds together and forms, wherein, and k ₂, k ₄, k ₆Wire diameter be standard wire diameter d, length is

k ₁, k ₇Wire diameter be d/4, length is

k ₃, k ₅Wire diameter be d/4, length is

Wherein R is the radius of magnetic cylinder, and L is the length of C field magnetic cylinder.

Claims (8)

1. the super uniformity C of passive hydrogen clock field magnetic cylinder, it is characterized in that, comprise magnetic cylinder skeleton and field coil, described magnetic cylinder skeleton is cylindrical shape, described field coil is wrapped in the outside of described magnetic cylinder skeleton, begins the described field coil of successively coiling from an end of described magnetic cylinder skeleton: adopt first dThe enamelled wire of/4 wire diameters is in described magnetic cylinder skeleton surface coiling LThe field coil of/16 length adopts again dThe enamelled wire of wire diameter is in described magnetic cylinder skeleton surface coiling LThe field coil of/4 length adopts again dThe enamelled wire of/2 wire diameters is in described magnetic cylinder skeleton surface coiling LThe field coil of/16 length adopts again dThe enamelled wire of wire diameter is in described magnetic cylinder skeleton surface coiling LThe field coil of/4 length adopts again dThe enamelled wire of/2 wire diameters is in described magnetic cylinder skeleton surface coiling LThe field coil of/16 length adopts again dThe enamelled wire of wire diameter is in described magnetic cylinder skeleton surface coiling LThe field coil of/4 length adopts again dThe enamelled wire of/4 wire diameters is in described magnetic cylinder skeleton surface coiling LThe field coil of/16 length, wherein, dBe the standard wire diameter, LLength for described magnetic cylinder skeleton.

2. the super uniformity C of passive hydrogen clock according to claim 1 field magnetic cylinder, it is characterized in that: the coiling coiling that described field coil is formed by the enamelled wire termination of a different radii from the beginning to the end forms, and described field coil only has two terminals.

3. the super uniformity C of passive hydrogen clock according to claim 1 field magnetic cylinder, it is characterized in that: the thickness of described magnetic cylinder skeleton is less than or equal to 1mm.

4. the super uniformity C of passive hydrogen clock according to claim 1 field magnetic cylinder, it is characterized in that: described magnetic cylinder skeleton is made by magnetic-permeable material.

5. the super uniformity C of passive hydrogen clock according to claim 5 field magnetic cylinder, it is characterized in that: described magnetic-permeable material is aluminium or titanium.

6. the manufacture method of the super uniformity C of a passive hydrogen clock field magnetic cylinder is characterized in that, may further comprise the steps:

(1) adopt magnetic-permeable material to be curled into cylindrical shape, then with the seam welding, polish, polish at the butt welded seam place again, obtains columnar magnetic cylinder skeleton;

(2) end from the magnetic cylinder skeleton begins successively coiling field coil: adopt first dThe enamelled wire of/4 wire diameters is in the surface coiling of magnetic cylinder skeleton L/ 16 length coils adopt again dThe enamelled wire coiling of wire diameter L/ 4 length coils adopt again dThe enamelled wire coiling of/2 wire diameters L/ 16 length coils adopt again dThe enamelled wire coiling of wire diameter L/ 4 length coils adopt again dThe enamelled wire of/2 wire diameters is in the surface coiling of magnetic cylinder skeleton L/ 16 length coils adopt again dThe enamelled wire coiling of wire diameter L/ 4 length coils adopt again dThe enamelled wire coiling of/4 wire diameters L/ 16 length coils, wherein, dBe the standard wire diameter, LLength for the magnetic cylinder skeleton.

7. the manufacture method of the super uniformity C of passive hydrogen clock according to claim 6 field magnetic cylinder, it is characterized in that: the thickness of described magnetic cylinder skeleton is less than or equal to 1mm.

8. the manufacture method of the super uniformity C of passive hydrogen clock according to claim 6 field magnetic cylinder, it is characterized in that: described magnetic-permeable material is aluminium or titanium.

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