Microwave resonant system with dual resonant frequency and a cyclotron fitted with such a system
First Claim
1. A resonant system for a cyclotron intended to operate at least at two frequencies f1, f2 and to accelerate successively charged particles of different types, this resonant system comprising an enclosure connected to ground and at least one hollow electrode or sector-shaped "Dee" inside which the beam of particles to be accelerated may travel, said electrode being disposed in the enclosure without electrical contact with said enclosure, said enclosure being placed between pole pieces of an electromagnet for supplying a magnetic field required for operation of the cyclotron;
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
means for injecting into the resonant system microwave signals for creating in the interaction spaces an accelerating microwave field;
a resonant element provided with an external conductor formed from a cylindrical tube closed at one of its ends and opening at the other end into the enclosure to which it is fixed and, placed in said external conductor, an internal conductor having one end fixed to the "Dee", wherein said internal conductor has the form of a loop said loop determining with the external conductor an adjustable capacity C enables the ratio f1 /f2 of the operating frequencies f1, f2 to be adjusted, the magnetic field required for operation of said cyclotron at frequencies f1, f2 being substantially unchanged.
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Accused Products
Abstract
The invention discloses a resonant system for accelerating charged particles of the cyclotron type allowing this cyclotron to operate successively at two resonant frequencies f1 and f2 =mf1 (m=2 for example) without modification of the structure, this resonant system comprising a sealed enclosure connected to ground and in which is disposed at least one hollow electrode or "Dee" having the shape of a sector, the enclosure and the "Dee" being associated with a resonant element formed from a tubular external conductor closed at one of its ends by a metal plate and whose other end opens into the enclosure and, placed inside this external conductor, two internal conductors connected together, at one of their ends, by means of a connecting element determining with the external conductor a capacity C variable in value, for adjusting the operating frequencies f1 and f2 of the cyclotron and more particularly the ratio f1 /f2.
61 Citations
11 Claims
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1. A resonant system for a cyclotron intended to operate at least at two frequencies f1, f2 and to accelerate successively charged particles of different types, this resonant system comprising an enclosure connected to ground and at least one hollow electrode or sector-shaped "Dee" inside which the beam of particles to be accelerated may travel, said electrode being disposed in the enclosure without electrical contact with said enclosure, said enclosure being placed between pole pieces of an electromagnet for supplying a magnetic field required for operation of the cyclotron;
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
means for injecting into the resonant system microwave signals for creating in the interaction spaces an accelerating microwave field;
a resonant element provided with an external conductor formed from a cylindrical tube closed at one of its ends and opening at the other end into the enclosure to which it is fixed and, placed in said external conductor, an internal conductor having one end fixed to the "Dee", wherein said internal conductor has the form of a loop said loop determining with the external conductor an adjustable capacity C enables the ratio f1 /f2 of the operating frequencies f1, f2 to be adjusted, the magnetic field required for operation of said cyclotron at frequencies f1, f2 being substantially unchanged. - View Dependent Claims (2, 3, 7, 9, 10, 11)
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
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4. A resonant system for a cyclotron intended to operate at least at two frequencies f1, f2 and to accelerate successively charged particles of different types, this resonant system comprising an enclosure connected to ground and at least one hollow electrode or sector-shaped "Dee" inside which the beam of particles to be accelerated may travel, said electrode being disposed in the enclosure without electrical contact with said enclosure, said enclosure being placed between pole pieces of an electromagnet for supplying a magnetic field required for operation of the cyclotron;
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
means for injecting into the resonant system microwave signals for creating in the interaction spaces an accelerating microwave field;
the resonant system comprising furthermore a resonant element provided with an external conductor formed from a cylindrical tube closed at one of its ends and opening at the other end into the enclosure to which it is fixed and, placed in said external conductor, an internal conductor having the form of a loop one end of which is fixed to the "Dee", said loop determining with the external conductor an adjustable capacity C enables the ratio f1 /f2 of the operating frequencies f1,f2 to be adjusted, the magnetic field required for operation of said cyclotron at frequencies f1,f2 being substantially unchanged, wherein said loop is formed from two metal internal conductors parallel to the generatrix of said cylindrical external conductor, said internal conductors, one at least of which is fixed to the "Dee", being connected to one another, at their other end, by a metal connecting element determining with the external conductor the capacity C of given value wherein a circular plate provided with a central aperture for passing the internal conductors therethrough, is disposed above the connecting element, said plate determining with said connecting element a variable capacity depending on the longitudinal movement of said connecting element.
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
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5. A resonant system for a cyclotron intended to operate at least at two frequencies f1, f2 and to accelerate successively charged particles of different types, this resonant system comprising an enclosure connected to ground and at least one hollow electrode or sector-shaped "Dee" inside which the beam of particles to be accelerated may travel, said electrode being disposed in the enclosure without electrical contact with said enclosure, said enclosure being placed between pole pieces of an electromagnet for supplying a magnetic field required for operation of the cyclotron;
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
means for injecting into the resonant system microwave signals for creating in the interaction spaces an accelerating microwave field;
the resonant system comprising furthermore a resonant element provided with an external conductor formed from a cylindrical tube closed at one of its ends and opening at the other end into the enclosure to which it is fixed and, placed in said external conductor, an internal conductor having the form of a loop one end of which is fixed to the "Dee", said loop determining with the external conductor an adjustable capacity C enables the ratio f1 /f2 of the operating frequencies f1,f2 to be adjusted, the magnetic field required for operation of said cyclotron at frequencies f1,f2 being substantially unchanged, wherein said loop is formed from two metal internal conductors parallel to the generatrix of said cylindrical external conductor, said internal conductors, one at least of which is fixed to the "Dee", being connected to one another, at their other end, by a metal connecting element determining with the external conductor the capacity C of given value wherein the connecting element is a cylindrical element coaxial to the external conductor of the resonant element, the height of the lateral walls of this connecting element and its diameter determining the value of the capacity formed by the lateral wall of the connecting element and the external conductor of the resonant element.
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
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6. A resonant system for a cyclotron intended to operate at least at two frequencies f1, f2 and to accelerate successively charged particles of different types, this resonant system comprising an enclosure connected to ground and at least one hollow electrode or sector-shaped "Dee" inside which the beam of particles to be accelerated may travel, said electrode being disposed in the enclosure without electrical contact with said enclosure, said enclosure being placed between pole pieces of an electromagnet for supplying a magnetic field required for operation of the cyclotron;
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
means for injecting into the resonant system microwave signals for creating in the interaction spaces an accelerating microwave field;
the resonant system comprising furthermore a resonant element provided with an external conductor formed from a cylindrical tube closed at one of its ends and opening at the other end into the enclosure to which it is fixed and, placed in said external conductor, an internal conductor having the form of a loop one end of which is fixed to the "Dee", said loop determining with the external conductor an adjustable capacity C enables the ratio f1 /f2 of the operating frequencies f1,f2 to be adjusted, the magnetic field required for operation of said cyclotron at frequencies f1,f2 being substantially unchanged, wherein said loop is formed from two metal internal conductors parallel to the generatrix of said cylindrical external conductor, said internal conductors, one at least of which is fixed to the "Dee", being connected to one another, at their other end, by a metal connecting element determining with the external conductor the capacity C of given value and wherein the connecting element is a cylindrical-shaped element whose lower face has a re-entrant profile, said cylindrical element being coaxial with the external conductor of the resonant element.
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
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8. A resonant system for a cyclotron intended to operate at least at two frequencies f1, f2 and to accelerate successively charged particles of different types, this resonant system comprising an enclosure connected to ground and at least one hollow electrode or sector-shaped "Dee" inside which the beam of particles to be accelerated may travel, said electrode being disposed in the enclosure without electrical contact with said enclosure, said enclosure being placed between pole pieces of an electromagnet for supplying a magnetic field required for operation of the cyclotron;
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
means for injecting into the resonant system microwave signals for creating in the interaction spaces an accelerating microwave field;
the resonant system comprising furthermore a resonant element provided with an external conductor formed from a cylindrical tube closed at one of its ends and opening at the other end into the enclosure to which it is fixed and, placed in said external conductor, an internal conductor having the form of a loop one end of which is fixed to the "Dee", said loop determining with the external conductor an adjustable capacity C enables the ratio f1 /f2 of the operating frequencies f1,f2 to be adjusted, the magnetic field required for operation of said cyclotron at frequencies f1,f2 being substantially unchanged, wherein said loop is formed from two metal internal conductors parallel to the generatrix of said cylindrical external conductor, said internal conductors, one at least of which is fixed to the "Dee", being connected to one another, at their other end, by a metal connecting element determining with the external conductor the capacity C of given value wherein the connecting element is centered in the resonant element by means of a centering stud fixed to a flexible membrane, said flexible membrane which ensures the seal of the resonant system being integral with the end closure plate of the resonant element.
- the electrode or "Dee" delimiting with the enclosure interaction spaces in which may be accelerated the charged particles issued from a source of particles disposed substantially in the center of the enclosure;
Specification