US3602827A - Graded plane,high-voltage accelerator - Google Patents

Graded plane,high-voltage accelerator Download PDF

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Publication number
US3602827A
US3602827A US719165A US3602827DA US3602827A US 3602827 A US3602827 A US 3602827A US 719165 A US719165 A US 719165A US 3602827D A US3602827D A US 3602827DA US 3602827 A US3602827 A US 3602827A
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Prior art keywords
planes
graded
voltage
cable
accelerator
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Expired - Lifetime
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US719165A
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English (en)
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Joseph T Peoples
George A Luce
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Nuclear Chicago Corp
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Nuclear Chicago Corp
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H5/00—Direct voltage accelerators; Accelerators using single pulses
    • H05H5/04—Direct voltage accelerators; Accelerators using single pulses energised by electrostatic generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/10—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in series, e.g. for multiplication of voltage
    • H02M7/103—Containing passive elements (capacitively coupled) which are ordered in cascade on one source
    • H02M7/106—With physical arrangement details

Definitions

  • One type of high-voltage accelerator system which has been developed is comprised essentially of a high-voltage DC power supply, an accelerator utilizing the DC voltage produced by the power supply to accelerate a beam of charged particles, and a cable system for carrying the high-voltage power from the power supply of the accelerator.
  • the accelerator also requires additional, relatively low-voltage power for production of the charged particles to be accelerated, so this must be produced in the power supply and transmitted to the accelerator via the cable system.
  • This type of accelerator design is unattractive from the standpoint of the length of the accelerating column and the small amount of current that can be supported by the voltage divider resistors without requiring auxiliary cooling. To apply this type of design to even higher voltages could only be accomplished by further lengthening of the accelerating column. Stability of the accelerator is also a problem because stray beam striking an accelerating electrode is likely to affect seriously the IR drop between electrodes.
  • the principal object of this invention is to provide an improved high-voltage DC accelerator.
  • a high-voltage accelerator is provided with a source of charged particles, a plurality of accelerating electrodes in operative association with the source, and graded means associated with the source and the accelerating electrodes for communicating individually appropriate electrical signals thereto.
  • a filament energizable by an AC signal to emit a stream of electrons is provided, the accelerating electrodes are disposed in spacedapart, columnar fashion opposite the filament and have attached thereto or integral therewith equipotential planes or discs, and a graded cable extending through the planes carries the AC signal to the filament and individual graded DC voltages to the equipotential planes and their associated electrodes from an external power supply.
  • a dramatic reduction in the length of the accelerating column is achieved in an accelerator constructed in accordance with this invention because of the fewer number of accelerating electrodes.
  • the accelerator does not have voltage divider resistors on the accelerating column; but these are located in the power supply where greater cooling may be achieved.
  • a single graded cable supplies the various electrical signals to the accelerator electrodes and filament instead of the two, bulky single conductor cables required in the past.
  • the equipotential planes provide a more uniform voltage gradient in the space surrounding the accelerating column; and this, together with the higher currents that can be supported by the voltage divider resistors in the power supply, promotes greater stability of accelerator operation with less likelihood of discharges occurring between physical areas in the accelerator that are at different electrical potentials.
  • FIG. 1 is essentially a schematic diagram of a graded highvoltage electron accelerator system including a graded cable DC transmission system;
  • FIG. 2 is an elevational view of the basic mechanical arrangement of the power supply shown schematically in FIG. 1;
  • FIG. 3 is a top view ofthe power supply of FIG. 2;
  • FIG. 4 is an elevational view of an accelerator head according to a prior art construction
  • FIG. 5 is an elevational view of the basic mechanical arrangement of the accelerator shown schematically in FIG. 1;
  • FIG. 6 is a partly sectioned, elevational view of a graded high-voltage cable of a particular type of construction.
  • a graded high-voltage accelerator system the three basic components of a graded high-voltage accelerator system are shown as a graded high-voltage DC power supply 100, a graded high-voltage accelerator 200, and a graded high-voltage DC power transmission cable 300.
  • Power supply 100 is one of a voltage-doubler type in which an AC line voltage is first transformed to provide a high-voltage AC ignaI, and then the high-voltage AC signal is rectified to produce a corresponding DC voltage.
  • the particulars of the operation of a voltage-doubler type of DC power supply need not be given here because they are well known to those skilled in the art.
  • a series of equipotential planes 1-11 are interconnected by a series of rectifiers 30, a series of resistors 31, and a series of capacitors 32.
  • the primary electrical function provided by this group of elements is the rectification accomplished by the rectifiers 30, with the capacitors 32 serving as transient equalizers and with the resistors 31 aiding in the equipotential voltage grading of the rectifier planes.
  • Equipotential plane 11 also serves as one of the planes in a series composed of planes 11-20 which are interconnected by three series of capacitors 40 and a series of resistors 41.
  • the rectifier symbol 30 may designate a plurality of rectifiers in series between respective equipotential planes if such plurality is needed in terms of the actual voltage parameters and similarly for resistors 31 and capacitors 32. Moreover, the number and types of such elements may vary from one application to another, as desired.
  • Planes 15 and 16 in the capacitor series of planes are directly connected by a lead 29 since these planes are functioning at the same potential. The reason for this will become apparent from a consideration of the physical arrangement later discussed. Plane 20 is actually the bottom of a tank which is at ground reference potential, and plane 1 is associated with top 28 of the tank which is at ground reference potential also.
  • Plane 11 the common plane of the rectifier and capacitor series of planes is connected via a resistive element to plane 21 in a series of planes 21-27 which are interconnected by resistors and 61.
  • the resistor symbols 60 and 61 may actually correspond to a plurality of individual resistors connected in series between each plane.
  • Plane 27 is associated with top 28 of the tank and is accordingly at ground reference potential.
  • Plane 6 is the rectifier series and plane 15 in the capacitor series are connected via cables 72 and 71, respectively, to secondary winding terminals 73 and 74 on a high voltage transformer 70.
  • Power for transformer is supplied via cables 81 and 82 from a power supply external to the tank.
  • a high-voltage AC signal across terminals 73, 74 is rectified to produce a corresponding high-voltage DC signal on equipotential plane 11 and also on equipotential plane 21.
  • Voltage grading of equipotential planes 1-11 is a varying voltage grading, while that on planes 11-20 and planes 21-27 is substantially constant voltage grading with only slight amounts of ripple thereon.
  • Transformer 75 is an isolation transformer powered by power supply 85 over cables 86 and 87, and it produces an AC signal across its secondary winding terminals 78 and 79.
  • Planes 110-116 are graded equipotential planes with planes 110-114 serving as accelerating electrodes, plane 115 together with cup 122 serving as a beam-extracting system of electrodes, and plane 116 serving as a high-voltage plane associated with filament 120.
  • Shield 117 is also associated with plane 116 and filament 120, being connected thereto via lead 1 18. Electrons emitted by filament 120 are accelerated by electrodes 110-115 and become a high-velocity electron beam which is capable of performing various types of desired work. In some applications the electron beam is scanned in a rectilinear fashion after acceleration to provide electron irradiation ofa width of material.
  • Graded cable 300 consists of a plurality of concentric conductors 210-270 surrounding a central wire 280. The seven concentric conductors 210-270 are connected at one end to planes 21-27 in power supply 100 via leads 61-67 and at the other end to planes 110-116 in accelerator 200 via leads 130-135 and lead 118 together with shield 117. In this fashion the graded voltages on equipotential planes 21-27 in power supply 100 are directly connected to associated planes 110-116 in accelerator 200 via a single cable.
  • Central wire 280 carries AC power from isolation transformer 75 to filament 120 to heat filament 120 and produce emission of electrons for acceleration.
  • FIGS. 2 and 3 show, respectively, a side and a top view of the mechanical arrangement of power supply 100 and one end of graded cable 300 associated therewith. It should be understood that the various electrical elements such as resistors, capacitors, and rectifiers, shown schematically in FIG. 1 are physically located between the individual discs serving as equipotential planes. As shown, high-voltage transformer 70 occupies one whole side of the power supply enclosure, and isolation transformer 75 occupies a corner of the enclosure on the other side thereof.
  • Discs 1-27 which serve as equipotential planes are mounted in two separate stacks between top 28 and bottom of the enclosure.
  • Disc 3 is shown in cross section to illustrate the typical cross-sectional profile of discs 1-27.
  • the discs which serve as equipotential planes carrying the highest DC voltage (300 kv.) are separated from the top 28 and bottom 20 of the enclosure, and therefore do not look with their flat sides at a ground plane.
  • the dual-stack arrangement serves to conserve space in the power supply, and thus the power supply enclosure can be smaller. This is a distinct advantage from a cost-savings standpoint since the enclosure will cost less and the factory or laboratory space needed to house the power supply can be reduced.
  • the separation of the highest voltage planes from the top and bottom of the enclosure with intervening graded voltage planes reduces the likelihood of sparking in the power supply, and this is highly advantageous because such discharges cause an expensive failure of the system involving likely damage to rectifiers and other elements which must then be replaced during consequent down time.
  • graded plane power supply is the size reduction achieved by grading the voltage gap between 300 kv. and ground with a plurality of equipotential planes.
  • the power supply enclosure will be filled with an insulating fluid, typically a nonconductive oil.
  • the separation distance required between a 300 kv. point and a ground point with only insulating oil intervening would be very great, but considerably less overall separation is required when graded planes intervene. This follows from the nonlinear relationship between insulator thickness and breakdown voltage so that less intervening distance with insulating fluid filling it is required when graded planes are used between 300 kv.
  • a further advantage is the added stability of the power supply achieved as a result of the graded equipotential planes serving to provide a uniform voltage gradient throughout the power supply enclosure.
  • capacitor equipotential planes 16-19 are mounted on three insulating columns or poles 43; and the remainder of the capacitor equipotential planes ll-15 are mounted on another three insulating columns 42.
  • Resistor equipotential planes 21-27 are shown mounted on a single insulating column 29 which is supported on plane 16.
  • Plane 27 is associated with the top 28 of the power supply enclosure.
  • Rectifier equipotential planes 1-10 are shown mounted on a single insulating column 33 which is supported on plane 11.
  • Plane 1 is associated with the top 28 of the power supply enclosure.
  • planes 1-10 with column 33 and planes 21-27 with column 29 will be mechanically constructed so I that they can be removed from the enclosure as a unit for case in servicing the power supply.
  • an additional plane or disc could be added at the bottom of rectifier series 1-10 with ajack-in relation to plane 11 to enable reversal of power supply polarity by flipping over that unit.
  • Resistors'Sl, 52, and 53 are shown connecting plane 11 to plane 21. These resistors are limiting resistors which protect the rectifiers associated with planes 1-10 from surge current in the event ofa short circuit in the accelerator or the cabling.
  • graded cable 300 extends through planes 21-27, and the respective concentric conductors 210-270 are bared at appropriate levels for connection to the respective planes.
  • Center wire 280 extends through plane 21 and connects via lead 76 to isolation transformer 75. It should be readily understood that other mechanical associations between graded cable 300 and planes 21-27 and transformer could also be implemented.
  • a 300 kv. power supply of the arrangement shown in FIGS. 2 and 3' can be constructed to have overall dimensions of approximately 5X6X5 feet, which is about half the size of many power supplies of other construction having the same rating.
  • An actually constructed embodiment has been operated at 300 kv. with about 30 kw. output power. From an industrial equipment standpoint a power supply of this rating and this overall size constitutes a real achievement.
  • extension of the basic concepts or features of its construction to achieve power supplies with a l,000 kv., kw. or higher rating is considered to be attainable with only relatively slight increases in overall size, possibly with greater numbers of graded planes in each stack.
  • a 300 kv. electron accelerator 400 of a particular prior art type is shown in FlG. 4, a 300 kv. electron accelerator 400 of a particular prior art type is shown.
  • a pair of bulky cables 501 and 502 bring the high-voltage DC power supply and an AC signal impressed on the high DC voltage.
  • the AC signal is transformed down to a lower voltage by transformer 350 before applying it to the filament, although this is not always necessary since a lower voltage, higher current signal could be produced in the power supply and carried by the cables directly to the filament.
  • a large number of accelerating electrodes for example the 20 electrodes 310-330 shown in FIG. 4, are required in the accelerating column for stable operation of this type of accelerator; and a resistor network 335 is required to provide a voltage dividing network for the respective electrodes.
  • Individual rings ofinsulating material 331 support the electrodes, and the rings and electrodes are sealed so as to form a vacuum tight enclosure.
  • the individual resistors in network 335 are required to be small and yet to be capable of operating at high power, and these two requirements are not readily reconciled.
  • a rather high magnitude of current through the resistors of this network is desirable so that a stray electron beam will not disrupt the value of their IR drop, but a practical limit is placed on the possible current value because of the heat that is generated.
  • Auxiliary cooling could be provided, but this is undesirable. Therefore, a 0.5 ma. current is a typical limit on the current through this resistor network. Expanding this design concept to provide an accelerator with a still higher voltage,
  • Graded accelerator 200 has seven graded planes 110-116 connected to seven graded conductors 210-270 in graded cable 300 via leads 130-135 and 118.
  • graded planes 111-115 are mounted on a triangular array of three. insulating columns 137 (only one shown) and cable 300 passes directly through the respective planes as in power supply 200 in FIG. 2. Each of the graded planes 111-115 may have the same cross-sectional profile as that of plane or disc 3 in the power supply shown in FIG. 2.
  • accelerating column 136 which is basically composed of internal electrodes (not shown) and cylindrical insulating members 137 mounted in a sandwichlike arrangement which must form avacuumtight seal.
  • Theelectrodes may be integral parts of their respective planes or discs, or they may be separate elements mounted to their respective planes.
  • planes 111-116 may be made much smaller in diameter than shown in FIG. 5 so that the lip of the planes extending out from column'136 is only wide enough to accommodate the passage therethrough of the respective segments of cable 300.
  • insulating columns like column 136 may not be required for supporting planes 111-116, rather the insulator rings 137 could themselves support the planes.
  • a cylindrical, gastight shield will be mounted to base plane 110 and be filled with a nonconducting fluid, typically an, insulating gas.
  • a nonconducting fluid typically an, insulating gas.
  • This insulating gas provides the electrical insulation between respective planes, and prevents discharges or sparking therebetween.
  • Conceivably planes 110-116.could be surrounded by a vacuumtight enclosure with a high internal vacuum. This would further reduce the chances of sparking between planes, and it might make it possible to eliminate central accelerating column 136 altogether.
  • a readily apparent size advantage is achieved by constructing an accelerator according to the graded plane design as illustrated in FIG. 5. Principally, the size difference results from the shorter insulating column with fewer electrodes. This is made possible by locating the voltage divider resistors in the power supply where they can be cooled efficiently and thus can support a heavier current (on the order of 2.0 ma.) to stabilize the IR drop between respective planes in the accelerator. Also, the graded planes themselves provide for more uniform distributions of voltage gradients in the accelerator column area, and this provides for more stable operation of the accelerator with less likelihood of discharges between planes or between accelerating electrodes. Thus, the distance between planes 110 and 116 in accelerator 200 in FIG.
  • 5 may .be as little as inches compared to a distance of around 18 inches between planes 330 and 340 in accelerator 400 in FIG. 4. Moreover, as for power supply 100, it is believed that extension of this design concept to accelerators of greater than 300 kv. potential is readily achievable.
  • a ,hollow copper tube 270 carries internally a wire 280 having a thin layer of insulation 416 thereon.
  • a layer of insulation 415 surrounds copper tube 270, followed by a layer of conducting material 260 which is shown as a thin layer of metallic foil but may also be a layer of braided copper or any other conducting material.
  • Braided copper has proved to be advantageously employed since it has greater resilience than a metal foil and is thus less likely to break under bending stress applied to the cable.
  • a process which has been employed for making relatively short (50 foot) lengths of this type of cable involves starting with copper tube 270 and disposing a length of a thin wall, heat-shrinkable plastic tubing over it. Then the tubing is heated so that it shrinks over the copper tube and is bound thereto, forming insulating layer 415.
  • a single layer of aluminum foil (e.g. approximately 4 mills thick) or, alternatively, a layer of braided copper (e.g. approximately 10 mills thick) is disposed over layer 415 to form conductor 260.
  • another length of heat-shrinkable plastic tubing is disposed over conductor 260 and heated to bind both to the previously built-up structure.
  • Second and third lengths of tubing may be employed to increase the thickness of the insulating layer as required. Repeating the above procedure enables one to build up any desired number of concentric conductors.
  • graded plane, high-voltage electrn accelerator described above is illustrative of the general advantageous features of this invention as they would apply to embodiments of accelerators for producing high-energy beams of other types of charged particles. Therefore, it should be understood that numerous modifications can be made by those skilled in the art without departing from the scope of this invention as claimed in the following claims.
  • a source of charged particles energizable by an AC signal a plurality of accelerating electrodes disposed in spaced-apart columnar fashion opposite said source; and a graded cable for carrying an AC signal to said source and a plurality of graded DC voltages to said accelerating electrodes from a remote location, said cable comprising a hollow conducting tube with an insulated wire mounted therein for carrying said AC signal and a plurality of layers of electrically conducting material concentrically disposed around said hollow conducting tube and spaced apart from said tube and from each other by intervening layers of electrically insulating material for carrying said plurality of graded DC voltages.
  • Apparatus as claimed in claim I further comprising a series of generally disc-shaped spaced-apart planes associated with respective ones of said source and said accelerating electrodes; said hollow conducting tube being connected to said plane associated with said source; and each of said layers of accelerating electrodes, the improved construction comprising a plurality of spaced-apart equipotential planes each associated with one of said spaced-apart accelerating electrodes; and a graded cable comprising a plurality of respectively insulated, concentric layers of conducting material, said equipotential planes each defining an aperture receiving at least a portion of said cable and each of said concentric layers of conducting material being connected directly to one of said planes.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Particle Accelerators (AREA)
  • Insulated Conductors (AREA)
US719165A 1968-04-05 1968-04-05 Graded plane,high-voltage accelerator Expired - Lifetime US3602827A (en)

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US71916568A 1968-04-05 1968-04-05

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US (1) US3602827A (de)
JP (1) JPS4819000B1 (de)
DE (1) DE1916878A1 (de)
FR (1) FR2005655A1 (de)
GB (1) GB1255341A (de)
NL (1) NL6905242A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810030A (en) * 1970-05-21 1974-05-07 Haefely & Cie Ag Emil Apparatus for focussing the beam of a particle accelerator
US5191517A (en) * 1990-08-17 1993-03-02 Schlumberger Technology Corporation Electrostatic particle accelerator having linear axial and radial fields
US5515259A (en) * 1992-08-11 1996-05-07 Schlumberger Technology Corporation Inductively charged coaxial capacitor accelerator
US5523939A (en) * 1990-08-17 1996-06-04 Schlumberger Technology Corporation Borehole logging tool including a particle accelerator
US5568021A (en) * 1993-03-22 1996-10-22 Gesellschaftfur Schwerionenforschung mbH Electrostatic accelerator up to 200 kV
US20120161673A1 (en) * 2009-09-03 2012-06-28 Oliver Heid Particle accelerator having a switch arrangement near an accelerator cell
US20130195252A1 (en) * 2012-01-13 2013-08-01 Martin Koschmieder Radiation Unit with External Electron Accelerator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5342600U (de) * 1976-09-17 1978-04-12
JPS5487100U (de) * 1977-12-02 1979-06-20
JPS58141287U (ja) * 1982-03-16 1983-09-22 高宗　直敏 広告板

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810030A (en) * 1970-05-21 1974-05-07 Haefely & Cie Ag Emil Apparatus for focussing the beam of a particle accelerator
US5191517A (en) * 1990-08-17 1993-03-02 Schlumberger Technology Corporation Electrostatic particle accelerator having linear axial and radial fields
US5325284A (en) * 1990-08-17 1994-06-28 Schlumberger Technology Corporation Electrostatic particle accelerator having linear axial and radial fields
US5523939A (en) * 1990-08-17 1996-06-04 Schlumberger Technology Corporation Borehole logging tool including a particle accelerator
US5515259A (en) * 1992-08-11 1996-05-07 Schlumberger Technology Corporation Inductively charged coaxial capacitor accelerator
US5568021A (en) * 1993-03-22 1996-10-22 Gesellschaftfur Schwerionenforschung mbH Electrostatic accelerator up to 200 kV
US20120161673A1 (en) * 2009-09-03 2012-06-28 Oliver Heid Particle accelerator having a switch arrangement near an accelerator cell
US20130195252A1 (en) * 2012-01-13 2013-08-01 Martin Koschmieder Radiation Unit with External Electron Accelerator

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GB1255341A (en) 1971-12-01
DE1916878A1 (de) 1969-11-06
NL6905242A (de) 1969-10-07
FR2005655A1 (de) 1969-12-12
JPS4819000B1 (de) 1973-06-09

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