US 2002/0008450 A1Published application

Continuous wave electron-beam accelerator and continuous wave electron-beam accelerating method thereof

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorHirofumi Tanaka

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Abstract

A continuous wave electron-beam accelerator that accelerates a continuous wave electron beam having a large average current includes an electron beam generator 11, an electron-beam accelerating unit 13 using a radio-frequency electric field having a frequency of approximately 500 MHz to accelerate an continuous wave electron beam, and electron-beam bending units 14, 15, 16 that are provided across the electron-beam accelerating unit and that bend the continuous wave electron beam a number of times. Each electron-beam bending unit includes divided magnets 15,16 having identical-polarity magnetic fields, and controls the continuous wave electron beam to pass through the electron-beam acceleration unit 13 a number of times on almost the same path.

Claims9

Dependent claims

A continuous wave electron-beam accelerator comprising:

electron-beam generating means for generating a continuous wave electron beam;
electron-beam accelerating means for accelerating the continuous wave electron beam;
first electron-beam bending means provided close to one end of said electron-beam accelerating means, said first electron-beam bending means bending the accelerated continuous wave electron beam;
and
second electron-beam bending means provided close to the other end of said electron-beam accelerating means, said second electron-beam bending means bending the accelerated continuous wave electron beam;
wherein:
each of said first electron-beam bending means and said second electron-beam bending means comprises a first bending electromagnet having a surface opposed to one side of said electron-beam accelerating means, a second bending electromagnet and a third bending electromagnet which are discretely provided opposing another surface of said first bending electromagnet;
said first bending electromagnet is made of a reverse bending electromagnet having a polarity opposite to that of said second bending electromagnet or said third bending electromagnet;
said second bending electromagnet has a polarity identical to that of said third bending electromagnet, and has a first magnetic field strength different from that of said third bending electromagnet;
and
said third bending electromagnet has a polarity identical to that of said second bending electromagnet, and has a second magnetic field strength different from that of said second bending electromagnet.

8 more elements

A continuous wave electron-beam accelerating method for a continuous wave electron-beam accelerator including:

electron-beam generating means for generating a continuous wave electron beam, electron-beam accelerating means for accelerating the continuous wave electron beam, first electron-beam bending means provided close to one end of said electron-beam accelerating means, said first electron-beam bending means bending the accelerated continuous wave electron beam, and second electron-beam bending means provided close to the other end of said electron-beam accelerating means, said second electron-beam bending means bending the accelerated continuous wave electron beam, said continuous wave electron-beam accelerating method comprising the steps of:
(a) adjusting the acceleration phase of the continuous wave electron beam, which is injected into said electron-beam accelerating means, by adjusting the difference between the phase of the continuous wave electron beam in said electron-beam generating means and the phase of an acceleration electric field in said electron-beam accelerating means;
(b) adjusting the acceleration phase of the continuous wave electron beam, which is injected into said electron-beam accelerating means, by adjusting the distance between said electron-beam accelerating means and said first electron-beam bending means;
(c) adjusting the acceleration phase of the continuous wave electron beam, which is injected into said electron-beam accelerating means, by adjusting the distance between said first electron-beam bending means and said second electron-beam bending means;
and
(d) adjusting the acceleration phase of the continuous wave electron beam, which is injected into said electron-beam accelerating means, by adjusting a ratio between the magnetic field strengths of identical-polarity bending electromagnets provided in said first electron-beam bending means and said second electron-beam bending means and the bending angles thereof.

3 more elements

A continuous wave accelerating method for a continuous wave electron-beam accelerator including electron-beam generating means for generating a continuous wave electron beam, electron-beam accelerating means for accelerating the continuous wave electron beam, first electron-beam bending means provided close to one end of said electron-beam accelerating means, said first electron-beam bending means bending the accelerated continuous wave electron beam;

second electron-beam bending means provided close to the other end of said electron-beam accelerating means, said second electron-beam bending means bending the accelerated continuous wave electron beam, and third electron-beam bending means provided between said first electron-beam bending means and said second electron-beam bending means at a straight portion opposed to said electron-beam accelerating means, said third electron-beam bending means generating dipole magnetic fields for adjusting the length of the circumferential path of the continuous wave electron beam which passes through the magnetic fields, said continuous wave accelerating method comprising the steps of:
(a) adjusting the acceleration phase of the continuous wave electron beam, which is injected into said electron-beam accelerating means, by adjusting the difference between the phase of the continuous wave electron beam in said electron-beam generating means and the phase of an acceleration electric field in said electron-beam accelerating means;
(b) adjusting the acceleration phase of the continuous wave electron beam, which is injected into said electron-beam accelerating means, by adjusting the distance between said electron-beam accelerating means and said first electron-beam bending means;
(c) adjusting the acceleration phase of the continuous wave electron beam, which is injected into said electron-beam accelerating means, by adjusting the distance between said first electron-beam bending means and said second electron-beam bending means;
and
(d) adjusting the acceleration phase of the continuous wave electron beam, which is injected into said electron-beam accelerating means, by changing the magnetic field strengths of said third electron-beam bending means so as to adjust the length of the path of the continuous wave electron beam each time.

3 more elements

Dependencies are inferred from the claim text.