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PLASMA TECHNIQUE (fusion reactors G21B; ion-beam tubes H01J 27/00; magnetohydrodynamic generators H02K 44/08; producing X-rays involving plasma generation H05G 2/00); PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS (obtaining neutrons from radioactive sources G21, e.g. G21B, G21C, G21G); PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS (atomic clocks G04F 5/14; devices using stimulated emission H01S; frequency regulation by comparison with a reference frequency determined by energy levels of molecules, atoms, or subatomic particles H03L 7/26)
Definition statement
This subclass covers:

Systems and methods for handling plasma, i.e.:

Generating plasma;

Confining plasma.

These systems are essentially related to experimental plasma systems used for studying the conditions for a controlled thermonuclear fusion.

Methods for investigating plasma, i.e. for measuring plasma parameters;

Systems and methods for generating local plasma to be used in industrial applications, e.g. plasma torches for cutting, welding, spraying or incinerating;

Systems and methods for generating and/or accelerating neutral particle beams, i.e. atomic or molecular beams, neutron beams;

Targets for producing nuclear reactions under irradiation;

Systems and methods for accelerating charged particle beams, i.e electrostatic accelerators, linear accelerators, magnetic induction accelerators, magnetic resonance accelerators.

References relevant to classification in this subclass
This subclass does not cover:

Nuclear fusion reactors

Ion beam tubes

Gas-filled discharge tubes for surface treatments

Mass spectrometers

Producing X-rays involving plasma generation

Informative references
Attention is drawn to the following places, which may be of interest for search:

Atomic clocks

Obtaining neutrons from radioactive sources

Radioactive neutron sources

Techniques for handling particles or ionising radiation not otherwise provided for; Irradiation devices; Gamma ray or X-ray microscopes

Lasers

Magnetohydrodynamic generators

Frequency regulation by comparison with a reference frequency determined by energy levels of molecules, atoms, or subatomic particles

Generating plasma; Handling plasma
Definition statement
This group covers:
  • Methods for investigating plasma, i.e. for measuring plasma parameters;
  • Systems and methods for confining a plasma by electric, magnetic or electromagnetic means;
  • Systems and methods for heating and sustaining a plasma, in particular for performing nuclear fusion reactions, at laboratory scale;
  • Systems and methods for generating plasma for industrial applications.
References relevant to classification in this group
This group does not cover:

Nuclear fusion reactors

Discharge vessels for exposing objects to the discharge

{Investigating plasma, e.g. degree of ionisation (electron temperature)}
Definition statement
This subgroup covers:

Methods for measuring different parameters inherently associated with plasma, by using radiation, thermal, electric, magnetic or acoustic means.

References relevant to classification in this group
This subgroup does not cover:

Measuring the arc parameters in a plasma arc torch

{by using photoelectric means (H05H 1/0031 to H05H 1/0043 take precedence)}
References relevant to classification in this group
This subgroup does not cover:

Investigating by interferrometry

Investigating by spectrometry

Investigating by using infra-red or ultra-violet radiation

{by spectrometry (see G01N 3/00)}
References relevant to classification in this group
This subgroup does not cover:

Mass spectrometry

Informative references
Attention is drawn to the following places, which may be of interest for search:

Investigating strength properties of solid materials by application of mechanical stress

{by using X-rays or alpha rays (see G01N 23/00)}
References relevant to classification in this group
This subgroup does not cover:

Investigating materials by particle radiation

{by using neutrons (see G01N 23/00)}
References relevant to classification in this group
This subgroup does not cover:

Investigating materials by neutron radiation

{by using microwaves (see G01N 23/223)}
References relevant to classification in this group
This subgroup does not cover:

Investigating materials by use of microwaves

{by thermal means (see G01N 25/00)}
References relevant to classification in this group
This subgroup does not cover:

Investigating materials by use of thermal means

{by electric means (see G01N 27/00, G01R)}
References relevant to classification in this group
This subgroup does not cover:

Investigating materials by use of electric means

{by magnetic means (see G01N 27/00, G01R)}
References relevant to classification in this group
This subgroup does not cover:

Investigating materials by use of magnetic means

{by acoustic, e.g. ultrasonic means (see G01N 29/02)}
References relevant to classification in this group
This subgroup does not cover:

Investigating materials by use of ultrasonic waves

Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma ({G21B 1/00 takes precedence;} electron optics H01J)
Definition statement
This subgroup covers:

Systems and methods for confining a plasma; systems and methods for heating and sustaining the confined plasma.

References relevant to classification in this group
This subgroup does not cover:

Closed discharge vessels for plasma treatment of objects exposed to the discharge

using cusp configuration (H05H 1/14 takes precedence)
Informative references
Attention is drawn to the following places, which may be of interest for search:

Plasma containment vessels with magnetic mirrors

wherein the containment vessel forms a closed or nearly closed loop {(G21B 1/05 takes precedence)}
Definition statement
This subgroup covers:

Laboratory systems in which plasma is confined in closed toroidal or helical loops by externally applied magnetic fields.

Relationship between large subject matter areas

Nuclear fusion reactors (operated as prototypes for industrial energy production) based on closed-loop plasma containment systems are classified in G21B.

References relevant to classification in this group
This subgroup does not cover:

Field Reversed Confinement nuclear reactors

Stellarator nuclear reactors

Tokamak nuclear reactors

wherein the containment vessel is straight and has magnetic mirrors
References relevant to classification in this group
This subgroup does not cover:

Electron mirrors

using externally-applied electric and magnetic field
Definition statement
This subgroup covers:

Laboratory systems in which plasma is generated and confined by application of external magnetic fields and electric fields.

References relevant to classification in this group
This subgroup does not cover:

Discharge vessels in which objects are exposed to the discharge

wherein the field oscillate at very high frequency, e.g. in the microwave range {e.g. using cyclotron resonance}
Definition statement
This subgroup covers:

Laboratory systems in which plasma is generated and confined by application of external electromagnetic fields at RF or microwave frequency, often operated in condition of electron-cyclotron resonance or ion-cyclotron resonance.

References relevant to classification in this group
This subgroup does not cover:

Discharge vessels operated at RF or microwave frequency, in which objects are exposed to the discharge

Ohmic heating
Definition statement
This subgroup covers:

Laboratory systems in which the plasma is heated by inducing a current through it. The current is induced by an electromagnetic winding linked with the plasma torus, i.e. the plasma acts as the secondary winding of a transformer.

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References relevant to classification in this group
This subgroup does not cover:

Nuclear fusion reactors

for injection heating {(G21B 1/15 takes precedence)}
Definition statement
This subgroup covers:

Laboratory systems in which high-energy atoms are injected into the ohmically heated, magnetically confined plasma. The atoms are ionized as they pass through the plasma and are trapped by the magnetic field. The high-energy ions then transfer part of their energy to the plasma particles in repeated collisions, increasing the plasma temperature.

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References relevant to classification in this group
This subgroup does not cover:

Nuclear fusion reactors

Generating plasma {(gas-filled discharge reactors H01J 37/32; nuclear fusion reactors G21B 1/00; ohmic heating H05H 1/20; injection heating H05H 1/22)}
Definition statement
This subgroup covers:

Arrangements for generating plasma to be used in industrial applications, i.e.

  • Plasma torches for cutting, welding, surface treatments or spectrometry;
  • Plasma systems, other than torches, for treatment of objects or incineration;
  • Devices using a plasma discharge for specific applications, e.g. spark gaps, plasma guns;
  • Microplasma systems;
  • Plasma acceleration systems;
  • Power supply systems for the arrangements covered by this group.
Relationship between large subject matter areas

Thermonuclear plasma generating and confining systems for use in nuclear fusion reactor plants are dealt with in G21B 1/00. Plasma generating and confining systems for laboratory nuclear fusion studies are dealt with in H05H 1/00 to H05H 1/22. H01J 49/00 covers the particle spectrometer or separator tubes. H05H 1/24 covers the plasma generation and therefore includes the torches used to generate a plasma from a gas. In gas spectrometry, a gas is normally turned into plasma and the electromagnetic emission is analysed. The torches used to turn such gas into plasma are generally classified in the lower subgroup H05H 1/30, because they use an electromagnetic field to activate the plasma gas.

References relevant to classification in this group
This subgroup does not cover:

Nuclear fusion reactors

Ohmic heating

Injection heating

Gas-filled discharge tubes for surface treatments

{Dielectric barrier discharges}
Definition statement
This subgroup covers:

Arrangements for generating plasma using dielectric-barrier discharges, i.e. a dielectric is interposed between the plasma generating electrodes.

References relevant to classification in this group
This subgroup does not cover:

Dielectric-barrier discharges in gas-filled discharge tubes

{Acoustic pressure discharge}
Definition statement
This subgroup covers:

Arrangements for generating local plasma by application of pressure waves to a gas or liquid-filled medium, i.e. cavitation, sonoluminescence.

References relevant to classification in this group
This subgroup does not cover:

Plasma generated by shock-waves

Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

Cavitation

Collapse of gas bubbles trapped in a liquid medium

Sonoluminescence

Emission of light by compression and collapse of gas bubbles in a liquid medium

Plasma torches {(metal working with constricted arc B23K 10/00, H05H10/02; metal spraying B05B 7/18, B05B 7/20)}
Definition statement
This subgroup covers:

Plasma torches, whereby a plasma torch is meant as a device for generating a directed flow of plasma, e.g. used for cutting or welding metals, for localized surface treatment of objects or spectroscopic analysis. In particular, this group covers:

  • Torches in which plasma is generated by applied electromagnetic fields, e.g. torches for spectrometry;
  • Torches in which plasma is generated by establishment of an arc, e.g. non-transferred arc, transferred arc or both.
Relationship between large subject matter areas

Systems for metal working which include a plasma generating torch are dealt with in B23K 9/00 and B23K 10/00.

References relevant to classification in this group
This subgroup does not cover:

Devices external to, and connected to, the plasma generating torch.

Generation of plasma by RF or microwaves

Generation of plasma in a gas-filled tube

Informative references
Attention is drawn to the following places, which may be of interest for search:

Metal spraying

Metal working with constricted arc

Cooling arrangements
Definition statement
This subgroup covers:

Arrangements within a plasma torch for cooling the components of the torch and evacuating the heat produced during the torch service.

using applied electromagnetic fields, e.g. high frequency or microwave energy (H05H 1/28 takes precedence)
Definition statement
This subgroup covers:

Torches in which plasma is generated by high-frequency electromagnetic fields (e.g. inductive coils enveloping the torch), in particular used for spectroscopic analysis.

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References relevant to classification in this group
This subgroup does not cover:

Cooling arrangements

Arrangements for arc stabilization by means of externally applied magnetic fields

Informative references
Attention is drawn to the following places, which may be of interest for search:

Mass spectrometry

using an arc (H05H 1/28 takes precedence)
Definition statement
This subgroup covers:

Torches in which plasma is generated by establishing an arc discharge between two electrodes.

References relevant to classification in this group
This subgroup does not cover:

Devices external to, and connected to, the plasma generating torch

Generation of plasma by RF or microwaves

Generation of plasma in a gas-filled tube

Informative references
Attention is drawn to the following places, which may be of interest for search:

Metal spraying

Details, e.g. electrodes, nozzles {(cf. B23K 9/24)}
Definition statement
This subgroup covers:

Details related to the electrical and mechanical components of a plasma arc torch.

References relevant to classification in this group
This subgroup does not cover:

Features related to welding or cutting electrodes

Circuits for supplying power to the torch

{Arc stabilising or constricting arrangements, e.g. by an additional gas flow (by externally applied magnetic field H05H 1/40; by using powders or liquids H05H 1/42; using coaxial protecting fluid H05H 1/341)}
Definition statement
This subgroup covers:

Arrangements for controlling the discharge generating arc, e.g. shaped nozzles, secondary gas circuits.

References relevant to classification in this group
This subgroup does not cover:

Arrangements providing protecting fluids coaxial with the plasma jet

Arrangements for arc stabilization by means of externally applied magnetic fields

{using coaxial protecting fluid (arc stabilising or constricting arrangements H05H 1/3405; introducing materials into the plasma H05H 1/42)}
Definition statement
This subgroup covers:

Arrangements for protecting the plasma jet exiting from the torch, e.g. from mixing with and/or cooling by the surrounding atmosphere.

References relevant to classification in this group
This subgroup does not cover:

Arrangements for controlling the plasma jet

Circuit arrangements (H05H 1/38 ,H05H 1/40 take precedence)
Definition statement
This subgroup covers:

Circuits arrangements for supplying electric power to the torch, and arrangements for supplying gases to the torch.

Relationship between large subject matter areas

The arc welding or cutting systems, in which a plasma arc torch is inserted, are dealt with in B23K 10/00 and B23K 9/00.

References relevant to classification in this group
This subgroup does not cover:

Guiding or centering of electrodes

Applied magnetic fields, e.g. for fucusing or rotating the arc

Circuits for arc welding systems

Guiding or centering of electrodes
Definition statement
This subgroup covers:

Systems for guiding consumable electrodes in the torch.

References relevant to classification in this group
This subgroup does not cover:

Automatic systems for feeding consumable electrodes to the torch

using applied magnetic fields, e.g. for fucusing or rotating the arc {(cf. B23K 9/08, B23K 9/073)}
Definition statement
This subgroup covers:

Arrangements for controlling the discharge generating arc with magnetic means.

References relevant to classification in this group
This subgroup does not cover:

Circuits for magnetic control of the arc in arc welding systems

Arrangements for controlling the discharge generating arc with mechanical means

with provision for introducing materials into the plasma, e.g. powder, liquid (electrostatic spraying, spraying apparatus with means for charging the spray electrically B05B 5/00{cf. B23K 9/324, B05B 7/22; arc stabilising or constricting arrangements H05H 1/3405; coaxial protecting fluids H05H 1/341})
Definition statement
This subgroup covers:

Torches provided with arrangements for introducing materials into the plasma, e.g. precursors for material treatment, either within the torch or at the torch plasma jet exit.

References relevant to classification in this group
This subgroup does not cover:

Electrostatic spraying apparatuses

Devices for supplying a welding powder

using applied electromagnetic fields, e.g. high frequency or microwave energy (H05H 1/26 takes precedence)
Definition statement
This subgroup covers:
  • Plasma systems, other than torches, for treatment of objects, wherein plasma is generated by applied electromagnetic fields, e.g. microwaves, radiofrequency;
  • Microplasma systems.
Relationship between large subject matter areas

Discharge tubes or vessels for plasma treatment of objects under controlled pressure are dealt with in H01J 37/32.

References relevant to classification in this group
This subgroup does not cover:

Plasma torches

Plasma devices using an arc

Dielectric barrier discharge devices

Informative references
Attention is drawn to the following places, which may be of interest for search:

Discharge tubes with provision for introducing objects or material to be exposed to the discharge

using an arc (H05H 1/26 takes precedence)
Definition statement
This subgroup covers:

Plasma systems, other than torches, for treatment of objects, wherein plasma is generated by establishment of an arc, e.g. incinerators.

References relevant to classification in this group
This subgroup does not cover:

Plasma torches

Systems with plasma generated by EM fields

{Corona discharges }
Definition statement
This subgroup covers:

Plasma systems, other than torches, for treatment of object surfaces, wherein plasma is generated by a corona discharge (i.e. the discharge occurs when the strength of the electric field around the electrode is high enough to form a conductive region, but not high enough to cause electrical breakdown or arcing to the object).

References relevant to classification in this group
This subgroup does not cover:

Dielectric barrier discharge devices

and using applied magnetic fields, e.g. for focusing or rotating the arc
References relevant to classification in this group
This subgroup does not cover:

Torches where plasma is generated by applied EM fields

Controlling the arc by EM fields

using exploding wires or spark gaps (H05H 1/26 takes precedence; spark gaps in general H01T)
Definition statement
This subgroup covers:

Systems using local plasma generation for specific applications.

References relevant to classification in this group
This subgroup does not cover:

Plasma torches

Informative references
Attention is drawn to the following places, which may be of interest for search:

Spark gaps in general

Plasma accelerators
Definition statement
This subgroup covers:

System and methods for accelerating ions and/or electrons out of a plasma.

References relevant to classification in this group
This subgroup does not cover:

Ion thrusters

Electron sources for spectroscopy

Ion sources for spectroscopy

Ion sources for ion beam tubes

Production or acceleration of neutral particle beams, e.g. molecular or atomic beams
Definition statement
This group covers:

Systems and methods for generating atomic beams, molecular beams and neutron beams, as well as systems and methods for generating electromagnetic radiation.

References relevant to classification in this group
This group does not cover:

X-ray or gamma detectors

Neutron detectors

Manipulation of neutral molecules by optical means

Irradiation devices

Charge exchange devices

Molecular or atomic beam generation {(charge exchange devices G21K 1/14; polarising devices G21K 1/16; using resonance or molecular beams for analysing or investigating materials G01N 24/002; atomic clock G04F 5/14; beam masers H01S 1/06)}
Definition statement
This subgroup covers:

Systems and methods for generating a beam of molecular or atomic particles, e.g. by irradiation of a target or by neutralization of charged particles.

References relevant to classification in this group
This subgroup does not cover:

Molecular beams for analysing or investigating materials

Optical traps

Atomic clocks

Charge exchange devices

Polarising devices

Cathodic sputtering

Beam masers

Neutron generation

Acceleration by electromagnetic wave pressure
Definition statement
This subgroup covers:

Systems and methods for accelerating electrically neutral particules by means of electromagnetic fields (e.g. by exploiting their dipolar electric moment, levitation devices) and for accelerating or cooling atom beams (e.g. atom traps, atom chips).

References relevant to classification in this group
This subgroup does not cover:

Use of photons for propulsive thrust

Manipulation of neutral molecules by optical means

Handling charged particles

Generating neutron beams (targets for producing nuclear reactions H05H 6/00; neutron sources G21G 4/02)
Definition statement
This subgroup covers:

Systems and methods for generating neutron beams, e.g. by impacting a target in a sealed envelope, by collision of particle beams, for logging tools, for material detection).

References relevant to classification in this group
This subgroup does not cover:

Targets for producing nuclear reactions

Radioactive neutron sources

Neutron generation in fission nuclear reactors

Neutron generation by low-temperature nuclear fusion

Neutron prospection and detection

Radiation detectors

Direct voltage accelerators; Accelerators using single pulses (H05H 3/06 takes precedence)
References relevant to classification in this group
This group does not cover:

Generating neutron beams

Details (targets for producing nuclear reactions H05H 6/00)
References relevant to classification in this group
This subgroup does not cover:

Targets for producing nuclear reactions

Accelerating tubes (vessels or containers of electric discharge tubes with improved potential distribution over surface of vessel H01J 5/06; shields of X-ray tubes associated with vessels or containers H01J 35/16)
References relevant to classification in this group
This subgroup does not cover:

Vessels or containers of electric discharge tubes with improved potential distribution over surface of vessel

Shields of X-ray tubes associated with vessels or containers

{High voltage cascades, e.g. Greinacher cascade}
Definition statement
This subgroup covers:

Electrostatic generators provided with high-voltage cascades, e.g. Greinacher cascade.

Targets for producing nuclear reactions (supports for targets or objects to be irradiated G21K 5/08{preparation of tritium C01B 4/00}); {targets, e.g. pellets for fusion reactions by laser or charged particles beam injection H05H 1/22}
Definition statement
This group covers:

Materials and devices used as a target for producing secondary particles upon impact of an impinging beam.

This subclass includes also auxiliary components of the targets, such as windows, radiation protective screens, cooling arrangements.

References relevant to classification in this group
This group does not cover:

Systems for treating objects by irradiation

Supports for objects to be irradiated

Pellets for fusion reactions

Arrangements for converting chemical elements by target irradiation

Recovery of isotopes from an irradiated target

{Polarised targets (polarising devices, e.g. for obtaining a polarised ion beam G21K 1/16)}
Definition statement
This subgroup covers:

Polarised targets used in quantum physics (e.g., targets for polarising neutron beams, spin-polarised thermonuclear fuels) and arrangements for their production.

References relevant to classification in this group
This subgroup does not cover:

Manipulation of particles by means of polarising devices

Details of devices of the types covered by groups H05H 9/00, H05H 11/00, H05H 13/00
Definition statement
This group covers:

Constructive arrangements and components of linear accelerators, magnetic induction accelerators and magnetic resonance accelerators (e.g. magnet systems, power supply systems), their auxiliary systems (e.g. beam injection systems, undulators) and irradiation systems using such accelerators.

References relevant to classification in this group
This group does not cover:

Irradiation of objects

Direct voltage accelerators

Synonyms and Keywords

In patent documents the following expressions/words are often used as synonyms:

"LINAC" and "Linear accelerator"

"CW" and "Continuous wave"

{Arrangements for beam delivery or irradiation (irradiation systems per se G21K 5/00)}
Definition statement
This subgroup covers:

Systems for delivering the accelerated beam of particles to the target.

References relevant to classification in this group
This subgroup does not cover:

Gantries for radiation therapy

Radiation diagnosis

Product irradiation systems

Circuits or systems for supplying or feeding radio-frequency energy (radio-frequency generators H03B)
Definition statement
This subgroup covers:

Systems for supplying microwave or radio-frequency energy to the different components and auxiliaries of the accelerator, e.g. accelerating cavities, electromagnets, particle sources.

References relevant to classification in this group
This subgroup does not cover:

Radio-frequency generators

Klystrons

Magnet systems {e.g. undulators, wigglers(free-electron laser H01S 3/0903)}; Energisation thereof
Definition statement
This subgroup covers:

All kind of magnets and superconducting magnets used in particle accelerators, e.g. for beam bunching (undulators, wigglers), focusing, bending or deflecting.

References relevant to classification in this group
This subgroup does not cover:

Free-electron lasers

Informative references
Attention is drawn to the following places, which may be of interest for search:

Magnets in general

Two-beam arrangements; Multi-beam arrangements {storage rings}; Electron rings
Definition statement
This subgroup covers:

Arrangements for storing and accelerating plural particle beams at the same time (e.g. for beam collision purposes) and for beam merging (e.g. funneling).

References relevant to classification in this group
This subgroup does not cover:

Beam collisioners for nuclear fusion

Arrangements for injecting particles into orbits
Definition statement
This subgroup covers:

Systems and methods for forming and injecting particle beams into an accelerator by mechanical, electrostatic or magnetic means (e.g. ion and electron sources, pre-accelerators).

Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

ECR

Electron Cyclotron Resonance

PIG

Cathodic source of light ions

EBIS

Electron-Beam Ion Source

CSD

Charge State Distribution

Arrangements for ejecting particles from orbits
Definition statement
This subgroup covers:

Arrangements for extracting the charged particles from the accelerators, e.g. septa, stripping foils.

References relevant to classification in this group
This subgroup does not cover:

Arrangements for modifying the trajectory of the extracted beam (gantries)

Arrangements for varying final energy of beam
Definition statement
This subgroup covers:

Systems and methods for varying the energy of the extracted beam, by electromagnetic or mechanical means or by emittance variation (e.g. RF cavities, stripping foils, stochastic cooling).

Vacuum chambers (H05H 5/03 takes precedence)
Definition statement
This subgroup covers:

The vacuum chambers, cavities and resonators used in a charged particle accelerator and their auxiliary systems (e.g. vacuum pumps, cryostats).

References relevant to classification in this group
This subgroup does not cover:

Accelerating tubes for direct-voltage accelerators

Cavities; Resonators {(travelling-wave tubes H01J 23/18; hyperfrequency cavities in general H01P 7/04, H01P 7/06)}
References relevant to classification in this group
This subgroup does not cover:

Travelling-wave tubes

Informative references
Attention is drawn to the following places, which may be of interest for search:

Hyper-frequency cavities in general

Details of linear accelerators, e.g. drift tubes (H05H 7/02 to H05H 7/20 take precedence)
Definition statement
This subgroup covers:

Specific components and systems of linear accelerators (e.g. drift tubes, arrangements for coupling cavities, arrangements for coupling power to cavities) and of the accelerators covered by H05H 15/00.

References relevant to classification in this group
This subgroup does not cover:

Details of the accelerators covered by H05H 9/00 to H05H 13/10

Other details

Informative references
Attention is drawn to the following places, which may be of interest for search:

RF supplying systems

Linear accelerators
Definition statement
This group covers:

Hadron linacs, drift-tube linacs, side-coupled cavity linacs, RF quadrupoles, lepton linacs and hybrid linacs.

References relevant to classification in this group
This group does not cover:

Gantries for radiotherapy

DC linear accelerators

Travelling-wave linear accelerators {(travelling-wave tubes H01J 25/34)}
Definition statement
This subgroup covers:

Systems and methods for accelerating electron beams by means of an electromagnetic wave (microwave) travelling in a tube serving as waveguide.

References relevant to classification in this group
This subgroup does not cover:

Travelling-wave tubes

Standing-wave linear accelerators
Definition statement
This subgroup covers:

Linear accelerators wherein electric fields are set up as standing waves within a resonant cavity, with drift tubes suspended along the central axis.

Linear accelerators for hadron particles, e.g. protons, neutrons and ions.

Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

HADRON

composite particle subject to strong interaction

LINAC

Linear Accelerator

{Drift tube LINACS}
Definition statement
This subgroup covers:

Linear accelerators with drift tubes suspended along the central axis.

{Hybrid systems}
Definition statement
This subgroup covers:

Linear accelerators combining the features of H05H 9/042 to H05H 9/045.

{Lepton LINACS}
Definition statement
This subgroup covers:

Linear accelerators for lepton particles, e.g. electrons.

Glossary of terms
In this subgroup, the following terms (or expressions) are used with the meaning indicated:

LEPTON

Elementary particle not subject to strong interaction

Magnetic induction accelerators, e.g. betatrons
Definition statement
This group covers:

Betatrons.

Magnetic resonance accelerators; Cyclotrons {(strophotrons, turbine tubes H01J 25/62)}
Definition statement
This group covers:

Cyclotrons, synchrotrons, synchrocyclotrons, fixed-field alternating-gradient accelerators and microtrons.

Informative references
Attention is drawn to the following places, which may be of interest for search:

Strophotrons, turbine tubes

Methods or devices for acceleration of charged particles not otherwise provided for
Definition statement
This group covers:

Systems and methods for accelerating or decelerating charged particles by means other than linear or magnetic resonance accelerators, e.g. laser pulses, resonance converters, magnetic monopole accelerators, dielectric-wall accelerators, inductive amplification of particle energy.

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Last Modified: 10/11/2013