JPS62139300A - Method of taking out emitted light of cynchrotron and electron wave ring employing the method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention utilizes the betatron oscillation inherent in an electron storage ring of high-energy electrons that are accelerated and stored in a high-frequency acceleration cavity while rotating along a designed trajectory. Taking advantage of the characteristics
A bending electromagnet with a zinc 45° angle for extracting the emitted light, 2 a septum electromagnet for incidence, 3 a Kitzker coil, 4 a high-frequency cavity, 5 a quadruple-like electromagnet with a vertical focusing force (hereinafter referred to as Qd), 6 is a quadruple-like electromagnet (hereinafter referred to as Qf) with horizontal focusing force, and 7 is the above-mentioned Qf8 as Qd.
This is a triplet set of 3 units placed on both sides of 5.

Note that 11 indicates a designed electron orbit, and 12 indicates an electron.

The conventional electron storage ring is arranged in a ring shape as shown in this figure, and the electron beam that enters the entrance septum electromagnet 2 passes through an entrance of only 8 mm x 10 mm square and is stabilized at a position 40 mm outward from the designed orbit. The beam is incident parallel to the designed electron trajectory. If the incident electrons 12 remain as they are, they will collide with the partition between the input scepter and the electromagnet 2 and be dissipated while making a few revolutions around the designed electron orbit 11, so the electron 12 will be replenished half a revolution downstream. However, it has been accumulated.

Next, the characteristics of synchrotron radiation SR (hereinafter simply referred to as synchrotron radiation SR) generated from the storage ring shown in FIG. 12 will be explained based on the drawing of FIG. 13.

In this figure, electrons 12 are accelerated in the direction of the orbital radius center on the designed electron trajectory 11 of the storage ring.

The synchrotron radiation SR emitted from the electrons 12 is a diverging light source that has sharp directivity only in the direction perpendicular to the plane of the designed electron trajectory 11 and diffuses in the tangential direction of the circular designed electron trajectory 11.

[Problems to be Solved by the Invention] In the conventional electron storage ring as described above, the irradiation field is extremely narrow, as shown by the shaded area in FIG. This method utilizes a method conventionally used for rings, etc., and is not a very effective method for expanding the irradiation field in practice, and there is room for improvement. Further, when the variable electromagnet is provided on the electron trajectory of the storage ring, the electron trajectory is very complicated, and it is not easy to output the synchrotron radiation SR in a predetermined direction.

This invention was made in order to solve the above-mentioned problems, and utilizes the betatron oscillation characteristics unique to an electron storage ring to cause an electron beam to move in waves around a designed electron orbit. By extracting the synchrotron radiation near the node, we can increase the opening angle from the designed electron orbit and expand the irradiation field of the synchrotron radiation in the vertical direction, while also stabilizing the electron beam in the horizontal and vertical directions. Move =; Moveable and transmit high-intensity synchrotron radiation
- Zinc 11 that can be generated and irradiated over a large area
′ Utilizing the betatron oscillation characteristics unique to the electron storage ring, the electrons accumulated on the designed electron orbit are caused to move vertically in a wave motion around the designed electron orbit using a vertical deflection means, and are moved near the nodes of the wave. It is characterized by being configured to extract synchrotron radiation light.

Further, an electronic wave ring according to another invention of the present invention is
Using the betatron oscillation characteristics of the electron storage ring, the electrons accumulated on the designed electron orbit are caused to undergo vertical and horizontal wave motion around the electron orbit by vertical deflection means and horizontal deflection means. An undulator is used to cause electrons that move in wave motion simultaneously or separately in the direction and horizontal direction to move in a high-intensity direction in the region from infrared to Expands the irradiation field using synchrotron radiation using large electrons.

Further, in the electronic wave ring according to another aspect of the present invention, a high-intensity light source with a wider irradiation field can be obtained by the vertical deflection means, the horizontal deflection means, and the undulator.

[Example] FIG. 1 shows a schematic configuration of an electronic wave ring which is an example of the present invention, where la to 1h, 2 to 7, and 1
1.12 is the same as the conventional example shown in FIG.

In FIG. 1, 21 is a magnet for the wave motion of the electron beam. Hereinafter, the orbital deflection of the electron beam will be described in the order of vertical deflection and horizontal deflection.

First, to perform the vertical deflection, QfB of triplet 7^, Qd5. QfB and Q on the downstream side of QfB
d5 is excited. Depending on the direction of the magnetic field (of the order of tens of Gauss, for example) of the variable vertical deflection electromagnet 22a, the trajectory of the electron beam incident on the QfB on the downstream side is deflected upward or downward, as shown in FIG. It is amplified and deflected by the vertical diverging force as shown by the solid line, and the deflection angle is 45°.
(Fig. 1). Bending electromagnet 1
As shown in FIG. 3(a), d is the angle of inclination θ, (for example, the beam is longitudinally focused and the trajectory is corrected.

Furthermore, the electron beam passing through the bending electromagnet 1d in parallel is
As shown in FIG. 4, it passes approximately horizontally at a distance of dzcm vertically from the stable orbit, and passes while being subjected to a longitudinal focusing force in the same manner as described above by the deflection electromagnet 1f on the downstream side. At this time, the electron beam incident on the triplet 7D further downstream intersects the stable orbit at Qa 5 of that triplet 7, and the electron beam deflected upward is deflected downward, and the electron beam deflected downward is deflected upward. As a result, as shown in FIG. 4, the electrons 12 move the third bending electromagnets 1a and 1f in the front and rear, approximately centering around the variable vertical bending electromagnet 22a, into m.
Make an up and down wave with No. This variable vertical deflection electromagnet In the present invention, when the wave electron 12 waves at a node No. of the vertical wave motion with a variable opening angle α with respect to the designed electron trajectory 11, the synchrotron radiation emitted at this node No. is used to generate electrons. The idea is to expand the irradiation field in the direction perpendicular to the orbital plane.

FIG. 5 is a three-dimensional diagram of the electron beam 12 undulating up and down with respect to the above-mentioned designed electron trajectory (stable trajectory) 11, where H is the vertical width of the irradiation field, W is the horizontal width,
It is shown that the vertical irradiation field of the synchrotron radiation SR is significantly expanded. Note that the shaded area in the figure is the conventional irradiation field.

Next, the magnetic field (for example, about ±100 Gauss) of the variable horizontal deflection electromagnet 22b is generated by the wave motion of the electron beam in the horizontal direction.
Depending on the direction of The respective orbits are corrected in opposite directions and are incident horizontally on the bending electromagnet 1d. At this time, bending electromagnet 1
Due to the inclination angle θ of d (for example, 11.7°), the horizontal deviation due to the above-mentioned deflection does not significantly affect the orbit radius R in the magnetic field, and the orbit of the electron beam 12 is kept relative to the stable orbit. The electron beam is further horizontally focused by Qf8, which stably moves outward or inward approximately parallel to the electron beam, and is positioned downstream.

This is a three-dimensional diagram of an electron beam that moves in parallel vertically and horizontally by a horizontal deflection electromagnet 22b. It emits highly directional, high-intensity photons generated in the undulator 21 from the antinode of vibration to spread over a large area. This shows that it can be irradiated. d! is the amount of movement in the left and right direction mentioned above, d2
is the amount of movement in the vertical direction, and ■9w is the same as in FIG. 5. Furthermore, since the orbit of the electron beam 12 is undulating due to the betatron vibration characteristics, the maximum inclination with respect to the stable orbit occurs at the vibration node No. Therefore, when a wiggler is placed at this node No. to extract light, the spread of the emitted light OR becomes maximum.

Such electron wave characteristics are created by storage using the triplet 7 (7A to 7D) shown in FIG. It can be used as an electronic wave ring.

This point can also be said to be one of the major features of this invention.

Next, wave amplitude control of the electron beam will be explained with reference to the excitation current waveform diagram in FIG. 10.

In FIG. 10, the horizontal axis is time t, and the vertical axis is exciting current I.

Then, an arbitrarily variable excitation current I0 is controlled to be applied to the variable vertical deflection electromagnet 22a and the variable horizontal deflection electromagnet 22b of FIG. 1 between the time to''t+ as shown in FIG. 10.

In this case, the synchrotron radiation SR can be irradiated with the electron beam at a constant speed for 10 seconds.

Next, the structure and operation of the undulator 21 that causes the wave electron beam to emit photons in the range from infrared rays to X-rays will be explained with reference to FIGS. 11(a), (b), and (C).

FIG. 11(a) schematically shows the undulator 21, where 31 is a small permanent magnet, and magnets of different polarities are arranged alternately above and below. Further, 32 is an electron beam, and λ0 is a period length.

The synchrotron radiation OR emitted from the undulator 21 has a high brightness of 1 when compared with the synchrotron radiation SR from a conventional storage ring.
It is synchrotron radiation with quasi-monochromaticity of 02 to 103 times. The directivity of synchrotron radiation SR from a conventional storage ring - relative brightness ratio [tlR] / [SR] of synchrotron radiation SR is 2N<
The relationship is [UR]/[SR] < 4N2. N in the above formula is the number of cycles of the undulator 21. Here, the minimum value of the relative brightness ratio is equal to the number of antinodes of the meandering electron orbit, and the maximum value is the value when the interference effect of the synchrotron radiation occurs at the antinodes where the directions of the electron beams are aligned. equal.

Moreover, the periodic angle in the case of the permanent magnet undulator 21 using SmCO5 or the like as the magnetic material. is about 3 to 4 cm, and if the period N at this time is lO, then the synchrotron radiation UR is 400 times as bright as the synchrotron radiation SR, and if the period number N is 16, the synchrotron radiation UR is the synchrotron radiation. 100 compared to SR
A brightness of 0 times is obtained, and the electrons passing through the undulator 21 in this way emit photons with high brightness in the range from infrared rays to X-rays. In addition, a;.

The installation position of the 11 indulator 21 is the structure 1 of the electronic wave ring! In addition, the electron beam is made to wave by a variable vertical deflection electromagnet installed on the orbit of the electron storage ring, and light is emitted at the nodes of the wave, so compared to conventional storage rings, the radiation from the storage ring is The light irradiation field can be greatly expanded. Second, the separate horizontal and vertical deflection electromagnets and undulators placed in the orbit of the electron storage ring make it possible to obtain a high-intensity light source with a much wider field than conventional synchrotron radiation, and it is also stable. Since the amplitude of the wave electron beam trajectory can be changed vertically and horizontally at arbitrary speeds, it can be used in lithography technology, etc., and its industrial significance is extremely large.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention; FIG. 5 is a three-dimensional diagram of an electron beam undulating up and down, showing that the irradiation field of synchrotron radiation SR is expanded; Figure 6 is a diagram showing the wave characteristics of the electron beam in the horizontal direction. Figure 7 is a three-dimensional diagram of the electron beam moving in parallel vertically and horizontally. The large intensity with good directionality generated in the undulator is shown in Figure 6. 8 and 9 are schematic configuration diagrams showing other embodiments of the present invention, respectively. FIG. 1O is a waveform diagram showing the waveform of excitation radio waves, and FIG.
) is a schematic diagram showing the structure of the undulator. FIG. 13 is a diagram for explaining the radiation light SR from the electron storage ring. 18~1h... Bending electromagnet, 2... Septum electromagnet for incidence, 3... Kitzker coil, 4... High frequency cavity, 5.6... Quadruple contact electromagnet, 7... Triplet, 11. ...Designed electron orbit, 12...Electron, 21...Undulator, 22a...Variable vertical deflection electromagnet, 22b...Variable horizontal deflection electromagnet, 23...Quadruple tangent electromagnet, 31...Small size Permanent magnet, 32...electron beam, entry 0...period length. Figure 12 of Rikimoto-cho 1 shows the composition of tax, electricity + S 7f

Claims (1)

[Claims] 1) In an electronic wave ring in which electrons move in waves around a designed electron orbit with a predetermined amplitude and a predetermined number of nodes, the synchrotron radiation light emitted from the electrons is A synchrotron radiation extraction method characterized by nearby extraction. 2) A predetermined number of bending electromagnets are arranged at predetermined locations on the designed electron orbit, and a predetermined number of high-frequency acceleration cavities and a predetermined number of multipole electromagnets that focus incident electrons are placed between the deflection electromagnets. an electron storage ring provided at a predetermined position on the orbit to accumulate the incident electrons; What is claimed is: 1. An electronic wave ring characterized by comprising a deflecting means for causing wave motion having a predetermined number of nodes and extracting synchrotron radiation light emitted from electrons near the nodes. 3) The electron wave ring according to claim 2, wherein the deflection means arbitrarily changes the amplitude of the wave electron trajectory and the opening angle from the electron trajectory at the vibration node. 4) A predetermined number of bending electromagnets are arranged at predetermined locations on the designed electron orbit, and between the deflection electromagnets, a high frequency acceleration cavity and a predetermined number of multipole electromagnets that focus incident electrons are placed on the designed electron orbit. an electron storage ring provided at a predetermined position to accumulate the incident electrons; Create wave motion with amplitude and a predetermined number of nodes,
vertical deflection means and horizontal deflection means for extracting synchrotron radiation light emitted from electrons near the node; An electronic wave ring characterized by comprising an undulator that generates highly bright photons in the range from to X-rays. 5) The electronic wave ring according to claim 4, wherein each of the deflecting means freely changes the amplitude of the wave electrons.