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‘ Aug- 20, 1946-
R. J. BONDLEY‘
.' 2,406,277 _
HIGH FREQUENCY ELECTRIC DISCHARGE DEVICE
Filéd Nov. 1:5, 1942
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F {2.4.
@212
Inventor~
Ralph J. Bondleg,
62%
by WW
HIS Attorneg.
Patented Aug. 20, 1946
2,406,277
UNITED STATES PATENT OFFlCE
2,406,277
HIGH-FREQUENCY ELECTRIC DISCHARGE
-
DEVICE
Ralph J. Bondley, Scotia, N. Y., assignor to Gen
eral Electric Company, a corporation of New
York
Application November ‘13, 1942, Serial No. 465,424
15 Claims.
(01. 250-275)
1
2
My invention relates to high frequency elec
inner conductor of the concentric cable extends
through a cylindrical cathode and serves as a
tric discharge devices and more particularly to
support for a shielding means, or member, which
ultra high frequency magnetrons of the space
is positioned ‘between the anode structure and the
resonant type.
In electric discharge devices of the magnetron (a other associated pole piece. The insulating
means which supports the rigid cable construc
type, it is of considerable importance to provide
tion is displaced an appreciable distance from
structure which permits the establishment of the
the end of the pole piece, thereby reducing the
desired electrostatic and magnetic ?elds of de
possibility of establishing any conductive layer
sired intensity and con?guration, and it is also
important that the supporting structure be capa 10 thereon, and the outer conductor of the concen
tric cable is joined to the cylindrical cathode by
le of withstanding voltage gradients of appre
ciable magnitude to obtain a power output com
mensurate with the size of the equipment. Fur
thermore, it is of considerable consequence to po
sition and arrange the elements and supporting
structure therefor so that the operation of the
discharge device does not cause the deposition of
a layer of conductive material on the insulating
parts, which would cause the discharge device to
become inoperative after a short period of oper
means of a rigid metallic member which serves
to shield the insulator. I also provide an im
proved structure for joining the cathode to the
concentric cable whereby the heat transfer be
tween the cable and the cathode is minimized.
For a better understanding of my invention,
reference may be had to the following description
taken in connection with the accompanying
drawing, and its scope will be pointed out in the
appended claims. Fig. 1 diagrammatically il
ation.
lustrates an embodiment of my invention as ap
In accordance with the teachings of my inven—
plied to an ultra high frequency magnetron of the
tion described hereinafter, I provide new and im
space resonant type employing a pair of per
proved-construction for an ultra high frequency
magnetron which not only affords the desired 25 manently magnetized pole pieces, and Fig. 2 is a
plan view of the anode structure. Figs. 3 and 4
insulating qualities of the structure but also mini
diagrammatically illustrate an alternative cath
mizes heat transfer between elements thereof.
ode supporting structure.
More particularly, I provide new and improved
Referring now to Fig. 1 of thedrawing, I have
structure for an ultra high frequency magnetron
of the type disclosed and broadly claimed in a 30 there illustrated my invention as applied to an
electric discharge device, such as an ultrahigh
copending patent application Serial No. 447,903 of
frequency magnetron, including an elongated cy
Elmer D. McArthur, ?led June 22, 1942, and which
lindrical container, the lateral wall structure of
is assigned to the assignee of the present appli
which is provided by a single metallic tube I which ‘
cation.
It is an object of my invention to provide a new 35 consists of a ferromagnetic material such as cold
' rolled steel, or the like. The ends of the container
and improved ultra high frequency electric dis
or tube l are closed by ?anged members 2 and 3
charge device.
which are welded or otherwise hermtically joined
Zt is another object of my invention to provide a
to the inner surface of tube I. The outer surface
new and improved structure for supporting an
electrode of an ultra high frequency magnetron 40 of the envelope may be provided with a plurality
of radially extending ?ns (not shown) for the
of the space resonant type.
purpose of dissipating heat.
It is a further object of my invention to provide
Within the container and approximately at
a new and improved cathode supporting structure
its central region there is provided an anode
for an ultra highfrequency magnetron wherein
the associated insulating means is protected by 45 structure 4 shown in detailed plan view in Fig. 2.
The anode structure 4 is preferably of circular
preventing the deposition of a conductive layer
con?guration provided with an enlarged central
material thereon incident to the evaporation of
opening 5 and a plurality or series of smaller
electrons from the electron emissive surface of
openings 6 arranged symmetrically about the
the cathode.
Brie?y stated, in the illustrated embodiment of 50 central opening. The central opening is joined
to the openings ,6 by means, of radially extending
my invention I provide a new and improved cath
ode supporting structure for an ultra high fre
quency magnetron which comprises a rigid con~
centric cable construction which extends through
one of the associated magnetic pole pieces. The
slots 1.
The anode structure 4, which preferably con
sists of copper, is supported by being brazed to
the interior wall of tube I. To facilitate the braz
2,406,277
3.
ing operation, small channels 8 are cut in the
4 -
To permit the evacuation of all parts of the
container, it is necessary to provide suitable pas
outer periphery of the structure and these are‘
used to receive rings of brazing material ap-.
sageways connecting the various sections or ele
plied before the anode structure is inserted With.
in the tube I. A relatively large circumferential
ments; For this purpose the disc-like members
M and it‘: may be provided with radially extend
ingslots 24 and 25, respectively. In this manner,
ly extending channel \9 serves to reduce the over- >
the longitudinal openings‘ of the magnetic pole
all weight of the anode structure.
Within the opening 5 of the anode structure
pieces l2 and I3, to be described presently, are in
communication with the outside surface of the
there is provided a thermionic cathode such as an .
indirectly heated cathode comprising a metallic». 10. pole pieces to facilitate evacuation of the con
sleeve N3 of nickel or other suitable material, and I . .tainer. Of course, the apertures in discs 20 and
which is coated externally with a suitable acti- Y '2! ‘also serve as communicating paths for the
vating materialrsuch as barium oxide.
_
same purpose. An evacuation or‘ exhaust tubula
' 'tion 26v maybe welded or otherwise sealed to the
Within ‘
the sleeve Ill, there is provided a?lamentary cath-v >
/
?anged member 3 at the base of the entire struc
ture.
ode‘heating element H by’which the cathode is '
maintained at an emissive temperature.
Where it is desired to employ the magnetic pole
In operation of the device, a space charge is‘ I
pieces 12. and I3, either singly or jointly, as sup
ports for one of the cooperating electrodes of
assumed to be developed in the space de?ned be
tween the cathode sleeve I8 and the surrounding ~
anode structure by the application of a suitable
potential impressed .therebetween.
the discharge device, these pole pieces may be
provided, respectively, with longitudinal open
The elec
ings or channels 21 and 28 which are preferably
of circular cross section having ends thereof.
which terminate in faces 29 and 30 of the pole
trons which compose this space charge are given
a spiral or orbital motion by a magnetic ?eld
produced by means to be described presently, and
the resultant oscillation, ‘or oscillations, about 25 pieces.
I provide a, rigid ‘concentric cable structure
the cathode produce excitation of the anode
which extends through. one of these openings
structure at its resonant frequency or harmonics .
or channels, such as channel 21, to Support the
thereof. 'The function of the anode structure
cathode structure in the desired spaced rela
may be explained from a point of view that it
is made up of va plurality of mutually. coupled 30 tion with the anode structure 4. The rigid cable
construction may comprise an inner conductor 3|
units in each of which the inductance is pro
and an outer tubular‘conductor 32, both of which‘
vided bythe wall surface of the openings 6, and
the capacitance is provided by the opposite sur
faces of the associated slots 1." Assuming this
are preferably constructed of a refractory metal
such as nickel or molybdenum, and ‘which are
35 maintained in the desired concentric spaced re
point. of view, it will be observed that the oper
ating frequency is in a large measure determined ‘
lation by means of a plurality of spaced insula
by the dimensions of the openings 6.
tors 33, 34 and 35.
In order
to provide a magnetic field of Vsuf?cient intensity ;
to permit the apparatus to function in its in
tended fashion, there are provided within the v40
tube I tapered magnetic pole pieces [2 and I3,
which may be: permanently magnetized, and
which are’ directed axially of the tube In and
which :extend in close proximity to the anode‘v
structure
4.
'
.
ample, the insulator may have the con?guration
-
illustrated including a restricted portion which,
engages the outer conductor 32 and wherein the
To assure the existence of a magnetic ?eld of
desired intensity when the pole pieces I2 and I3
are permanently magnetized, these members
long leakage path is provided by longitudinally
should be constructed of a magnetizable‘ material 1
or structure'having a high coercive force and a 50
high energy factor. One of the materials used ‘
in this connection is that alloy, or group of al
loys, of aluminum, nickel and cobalt. For ex
‘ ' amp1e,'one type of alloy which may be used for
‘1 Patents
this purpose
2,027,994
is that
to 2,028,000.
described To
in provide
the Mishima
a low' '
reluctance connection between the base extremi
ties of the respective pole pieces I2 and I3 and
the lateral wall or tube |, the pole pieces may be
respectively seated upon relatively thick disc-like .60
1 members it and l5 consisting of a ferromagnetic ‘
‘
material such as steel.
'
I provide means for maintaining the rigid
cable construction in position and which is dis
placed a. sufficient distance from the cathode
structure, .or the pole face 29, in order that it is
not subjected to the heat incident to the cathode.
This structure may comprise an insulator 35 and
is designed to afforda long leakage path. For ex
extending parts to have a general H-shaped
cross-section. Of course, inasmuch as insula
tor 36 serves as a support for the. cable struc
ture, it is apparent that the insulator closely
engages the wall surface of channel 21.
As a means for supporting the cathode struc
ture from the outer conductor 32, I’provide a
metallic electrostatic shielding member 3'! hav
ing a ?anged part of a diameter equal to or less
than the diameter of Opening 5, thereby shield
ing the insulator 36 and preventing the deposi
tion of a conductive layer thereon which would
otherwise occur incident to the evaporation of
V electrons from the emissive surface of the oath
For thejpurpose of se
ode sleeve l0.
curing the pole pieces ?rmly to these base mem
Member 31 is'provided with an
aperture within which an insulator 31' extends,
l'iwhichare slipped over the pole pieces and 5.5 thereby insulating and centering inner conductor
3|, Member 3'! may be welded Or soldered to the
welded to the base members. Accurate spacing
‘ bers, use may be made of clamping rings l6 and
outerjconductor 32 and the entire assembly is ar_
ranged to minimize the heat transfer between the
cathode and the concentric cable construction,
70 particularly outer conductor 32. One way in
which such heat transfer may be minimized is by
the employment of a plurality of spaced metallic
tabs 38¢and 39 of relatively small dimension which
1
are made integral with .part 31 or which may be
‘
of. the pole pieces 12 and IS with reference to r
g the anode structure may be obtained by the use 1
1
j
i;
5
of’ spacing rings-l8 and I9 used in the manner
indicated... As shown in Fig. 1, each of these
rings is interposed between one surface of the
anode structure and a surface-of apertured discs
20 and 2|, each disc in turn being in abutment
j with an appropriately formed shoulder 22 and 23
' ‘ provided by the adjacent pole piece.
made separately and welded or otherwisejoined
2,406,277
6
to the cathode sleeve l0 and. part 31. These tabs
are of su?icient size to a?ord the desiredmechan
ical strength of the juncture but the size and
number are chosen to prevent appreciable heat
transfer, from the cathode to the outer conduc
tor 32.
/
structure,’ The outer conductor 32 of the con
centric cable construction, as mentioned: above,
by‘ virtue of the slot‘ 46 therein,_ permits ‘ready
escape of undesired gas from the inside of, the
cable during the exhaust operation; .- i
‘
Fig. 3 diagrammatically illustrates a modi?-v
cation of my invention showing another formof
Inner conductor 3| is connected to one ter
a cathode structure which is supported fromithe
minal, such. as the upper terminal, of the cathode
rigid concentric cable‘ structure, and wherein cor
heating element II and serves to supply current
thereto, the lower terminal of the cathode heating 10 responding elements have been, assigned like ref
erence numerals. In the arrangement of Fig. 3,
element being conductively connected to the cath
' the cathode is supported from the outer tubular
ode sleeve |9 which constitutes a path for the
conductor 32 by means, of a metallic ?anged eyelet
cathode heating circuit which is completed
?tgwhich is welded or soldered to an apertured
through the ?anged metallic member 31 and outer
conductor 32. The lower extremity of the inner 15 metallic disc 5| and whichis provided ‘with an
inserted insulator 52, shown in Fig. 4, which ?ts
conductor 3| is centered and supported by a
into the end of the tubular conductor 32 and
heat resistant insulator 49 positioned at - the
through whichv the inner conductor 3| extends.
lower end of the cathode sleeve I0.
The cathode sleeve I0 is supported by disc 5| by
I also provide electrostatic shielding means,
such as a metallic disc 4! , supported by the inner 20 means of a plurality of appropriately spaced me
tallic tabs 53 which are Welded or soldered to
conductor 3| which extends through insulator 4B.
sleeve 10 and disc 51. In like manner, a metallic
This member serves to prevent the collection of
shielding member 54, preferably of disc form,‘
electron current on the face of pole piece |'3.
completely closes the end of cathode sleeve I!) and
The concentric cable construction is provided
with externally accessible terminals or lead-in 25 is attached thereto by means of metallic tabs 55.
In this modi?cation of my invention, the inner
wires 42' and 43 which are connected, respectively,
conductor 3| does not extend through the lower
to inner conductor 3| and outer tubular conduc
shielding member, and the lower terminal of the
tor 32‘ and are, of course, arranged to a?ord this
cathode heating element II is conductively con
connection by means of a sealing structure which
may include a glass or vitreous seal 44 supported 30 nected to inner conductor 3| at a point near‘the'
bottom of the space de?ned by sleeve H1.
by a ?anged metallic cylinder 45, the latter of
The shielding members 5| and 54 serve to col
which is Welded or soldered to the member 2.
lect the electron current which would otherwise
In order to facilitate the evacuation of the
tend to travel axially along the electrodes of the
space de?ned by the outer conductor 32, this ele
discharge device to points substantially beyond
ment may be provided with a longitudinally ex
tending opening or slot or slit 46. The tubular
the anode-cathode region.
.
outer conductor 32 may be formed of sheet metal
Certain features of the electric discharge de
and the ends of the plate from which it is formed
vice shown inFig. 1 including the metallic con~
notbeing joined.
taining member and the permanently magnetized
Of course, it will be appreciated that I may 40 magnetic ?eld members, are disclosed and broad
ly claimed in the aforesaid copending patent ap
employ a single opening, or a series of longitu
dinally disposed openings, in the tubular conduc
plication of Elmer D. McArthur, Serial No.
tor 32 which will serve equally well for the pur
447,903, ?led June 22, 1942. Other features relat~
ing to certain improved aspects of the cathode
45 support construction are disclosed and claimed
evacuation of gas during the exhaust process.
in a copending application, Serial No. 465,401 of
Energy may be extracted from the space res
onant region, or regions, by any suitable output
George M. White, ?led concurrently herewith and
which is also assigned to the assignee of this ap
electrode means which may take the form of a
pose c-f providing a passage, or passages, for the
loop 4? constituting an extension of an inner con
ductor 48 of a concentric transmission line com
prising the inner conductor 48 and a concentric
outer conductor 49.
In operation, upon the application of a suitable
unidirectional voltage between the anode struc
ture and the cathode, the system in its entirety ,
will be set into oscillation, the energization of the
various space resonant regions, or cavities, de?ned
by openings 6 and slots 1 being derived from the
motion of the electrons constituting the space
charge between the cathode sleeve l0 and the sur
face or‘ the enlarged central opening 5 of the
anode structure 4. The various space resonant
regions are mutually coupled and the energy of
these cavities may be supplied to an external
utilization circuit through loop 41 and the con
centricv transmission line comprising conductors
48 and 49.
One of the principal advantages of an electric
discharge device built in accordance with my in
vention is the ease of construction inasmuch
plication.
While I have shown‘ and described my inven~v
tion as applied to a particular device embodying
various elements diagrammatically shown, it will
be obvious to those skilled in the art that changes
and modi?cations maybe made without depart- '
ing from my invention, and I, therefore, aim in
the appended claims‘ to cover all such changes and
modifications as fall within the true spirit and
scope of my invention.
What I claim as new and desire to secure by
Letters Patent of the United States is:
1. An electric discharge device comprising a
plurality of‘ cooperating enclosed electrodes in
cluding a thermionic cathode having a heating
element‘ and an anode structure surrounding said
cathode, means for establishing a magnetic ?eld .
as the coated cathode, particularly sleeve HI,
comprising a magnetic pole piece substantially
perpendicular to therplane of said anode struc
tur'e, said magnetic pole piece having a channel
extending longitudinally therethrough, a rigid
concentric cable structure supporting said cath
ode and for supplying current to said heating
may be welded to the cathode assembly as a ?nal
element and comprising an inner conductor and
step in the construction thereof, thus eliminating
a tubular metallic outer conductor and including
the necessity for masking the magnetic pole pieces
a plurality of spaced insulating means therebe
l2 and I3 and the other metallic parts‘of the 75 tween, and an insulator displaced from the end
2,406,277
7
*of said channel facing‘ said anode structure and
supporting said cathode structure.
l.
2. An: electric discharge devicel Comprising a
plurality of cooperating enclosed electrodes in
ductor and a tubular metallic outer conductor,
a flanged metallic member on one'side of'said V
anode structure and connected to and supported
piece substantially perpendicular to said anode
by said outer conductor and having a diameter
equal to or less than the diameter of the anode;
cathode region, said inner conductor extending
through said cathode, and an electron shielding
member supported‘ by the extending-portion of
structure, said ‘pole vpiece vhaving therein a .chan
said inner conductor.
cluding a thermionic cathode, an anode structure
surrounding said cathode, means ‘for'establish
ing a magnetic ?eld comprising a magnetic pole
' nel extending longitudinally therethrough, a con
centric cable structure supporting said cathode
in spaced relation with'respect' to said anode
structure and comprising an innerconductorand
a tubular metallicrouter conductor andha'ving
'
j
'
1
>
'7. An electric discharge device comprising _a
plurality of cooperating enclosed electrodes in
cluding a cylindrical thermionic cathode having
therein a’heating element and an anode struc-1
ture substantially surrounding said cathode, a
a plurality. of longitudinally displaced insulating 15 pair of magnetic pole pieces substantiallyrper
pendicular to the'plane of said anode structure
ductors in spaced relation, and an insulator dis-'7
and positioned on opposite sides thereof, one of
placedfrom the end ofgthe channel terminating
said pole pieces having a cylindrical channel ex
in the pole face of said pole piece’ and supporting
tending longitudinally therethrough, a concentric
said cable structure.
‘
cablev structure positioned within the channel‘ of
means maintaining said‘inner' and outer con
3. ,An' electric discharge. device comprising a
plurality of cooperating ‘enclosed electrodes in
cluding a thermionic cathode and an anode struc
ture surrounding said cathode, means for estab
lishing 'a magnetic ?eld comprising a, magnetic 25
one of said pole pieces'supporting said cathode
in spaced relation with said anode structure and
comprising an inner and outer‘metallic conduc
tor, insulating means displaced from the end of
said one channel supporting said outer conduc
tor,'a metallic flanged member connected to said
in a channel extending longitudinally there
outer conductor and said cathode and having a
through, and a'concentric cable structure sup
diameter less than that of said channel, and
porting said cathode comprising an‘ inner'con
an electron shielding metallic member positioned
ductor and a tubular metallic outer conductor in~ 30 between said anode structure and the other pole
cluding a plurality of. spaced insulating means
piece, said inner conductor extending through the
cylindrical cathode and providing a support for
maintaining the'conductorsr in spaced relation.
said last mentioned member.
4. An electric discharge device comprising ‘a
plurality of cooperating enclosed electrodes in
8. An electric discharge device comprising a
cluding a thermionic cathode‘ having a heating
plurality of cooperating enclosed electrodes in
element, an anode structure. vsurrounding said . cluding a thermionic cathode having a heating
element and an anode structure substantially
cathode, means for establishinga magnetic ?eld
comprising ‘a magnetic pole piece substantially
surrounding said cathode, means for‘ establishing
a magnetic ?eld comprising a, magnetic pole piece
perpendicular to the plane'of said anode struc
substantially perpendicular to the plane of said
ture, said magnetic pole piece having a‘ channel
extending longitudinally therethrough, and a con
anode structure, said magnetic pole piece having
a channel extending longitudinally therethrough,
centric cable structure supporting said cathode
a concentric cable structure supporting said cath
comprising an inner conductor and a tubular
ode and for supplying current to said heating
metallic outer conductor and a plurality of spaced
insulating means maintaining the inner and out
element and, including an inner conductor and a
pole piece, said magnetic pole piece having there
‘:
tubular outer metallic conductor, an insulator
5. -An .electric discharge device of the mag
within. said channel and displaced from the end
netron'type comprising a'plurality of cooperating
thereof facing said cathode and supportingjsaijd
electrodes including a cathode and’ an anode
cable structure in said channel, and a 'metallic
er conductors in spaced relation...
. ,_
structure, means for establishing a'magnetic ?eld 50 member connected between said cathode and said
outer conductor to minimize heat transfer be
and comprising a magnetic pole piece lying sub
1 stantially perpendicular to the plane of said an
ode structure and having alongitudinal channel
tween said cathode and said outer conductor.
9. An electric discharge device comprising a
plurality of cooperating enclosed electrodes in
' therethrough, an enclosure around said electrodes
and the means for producing the magnetic ?eld, 55 cluding a thermionic cathode having a heating
means supporting said cathode in spaced relation ‘ element, an anode structure surrounding said
cathode, means for establishing a magnetic ?eld
with respect to said anode structure and includ
comprisinga magnetic pole piece substantially
ing a rigid concentric cable structurehaving an
perpendicular to the plane of said anode struc
. inner conductor and an outer tubular conductor,
said tubular conductor being attached to said 60 ture, said magnetic pole piece having a channel
extending longitudinally therethrough, and a
cathode and the inner conductor extending
through the cathode, and an electron shielding
concentric cable structure supporting said cathe
means supported by said inner conductor.
ode comprising an inner conductor and a tubu-_
6. An electric. discharge device comprising a
lar metallic outer conductor and insulating means
plurality’ of cooperating‘ enclosed electrodes in‘ 65 maintaining the inner and outer conductors in
cluding a cylindrical thermionic cathode having
spaced relation, said outer tubular conductor be
a heating element and an anode structure, means
ing provided with an opening to facilitate evac
forv establishing a magnetic ?eld comprising a
uation of said discharge device.
magnetic pole piece substantially perpendicular
10. 'An electric discharge device comprising a
to the plane of said anode structure, said mag‘ 70 plurality of cooperating electrodes including a'
netic pole piece having a cylindrical channel ex
substantially cylindrical cathode having a heat
tending longitudinally therethrough, means com
ing element and‘an anode structure substantially
prising a concentric cable, structure supporting
surrounding, said cathode, a pair, of magnetic
' said cathode and for supplying current to said
pole pieces spaced on opposite sides of said an,
heating" elem??? and including. an inner, gone 75 ode structure, said pole pieces, each havingthere
2,406,277
9
in a channel positioned longitudinally the pole
piece, means positioning said cathode and for
supplying heating current to said heating ele
ment comprising a rigid concentric cable con
struction including inner and outer conductors
extending through the channel of one of said
7
10
longitudinally of the pole piece, means position
ing said cathode comprising a concentric cable
construction extending through the channel of
one of said pole pieces and comprising an inner
conductor and a concentric outer conductor and
pole pieces and having externally accessible ter
insulating means therebetween, an insulator po
sitioned in the channel of said one pole piece
minals, means connecting the outer conductor '
within the vicinity of the pole face supporting
of said cable to one end of said cathode, and
and centering said cable, a cathode heating ele
means positioned in said channel and engaging 10 ment surrounded by said cylindrical cathode and
said outer conductor to position said cable with
having one terminal electrically connected to
respect to said anode structure.
said inner conductor, and a metallic member
11. An electric discharge device comprising a
connected to the other terminal of said cathode
plurality of cooperating electrodes including an
heating element and said outer conductor and
elongated cathode and an anode structure sur
spaced between said cathode and said insulator
rounding said cathode, a pair of magnetic pole
to prevent the condensation of conductive ma
pieces spaced on opposite sides of said anode
terial on said insulator.
structure, said pole pieces each having therein
14. An electric discharge device comprising a
a channel positioned longitudinally of the pole
plurality of cooperating electrodes including a
piece, and means positioning said cathode com 20 thermionic cathode having an emissive surface
prising a concentric cable construction attached
and an anode structure surrounding said cath
to said cathode and extending through the chan
ode, a ‘pair of magnetic pole pieces spaced on
nel of one of said pole ‘pieces and an insulator
opposite sides of said anode structure, said pole
in said channel and engaging said cable to cen
pieces each having therein a channel positioned
ter said cable, said insulator having a creepage 25 longitudinally of the pole piece, means position
path from said cable to the wall of said channel
ing said cathode comprising a concentric cable
substantially greater than the shortest distance
construction extending through the channel of
between said cable and said wall.
one of said pole pieces and attached to said
12. An electric discharge device comprising a
cathode, an insulator positioned in the channel
plurality of enclosed cooperating electrodes in 30 of one of said pole pieces within the vicinity of
cluding a thermionic cathode including a heat
the pole face, and shielding means positioned
ing element and an anode structure surrounding
between said cathode and said insulator, to pre
said cathode, a pair of magnetic pole pieces
vent the deposition of conductive material on
spaced on opposite sides of said anode structure
said insulator.
and each having therein a channel of circular
15. An electric discharge device comprising a
cross section positioned longitudinally of the pole
plurality of cooperating electrodes including a
piece, means supporting said cathode and for
thermionic cathode having‘an emissive surface
supplying current to said heating element com
and an anode structure surrounding said cath
prising a rigid concentric cable construction in
ode, a pair of magnetic pole pieces spaced on
cluding an inner and outer conductor extending 40 opposite sides of said anode'structure, said pole
through the channel of one of said pole pieces,
pieces each having therein a channel positioned
and an insulator ?tted in the channel of said
longitudinally of the pole piece, means position
one pole piece and engaging said outer conductor
ing said cathode comprising a concentric cable
to center said cable and thereby to center said
construction extending through the channel of
cathode with respect to said anode.
one of said pole pieces and attached to said cath
13. An electric discharge device comprising a
ode, an insulator positioned in the channel of
plurality of cooperating electrodes including a
one of said pole pieces Within the vicinity of
cylindrical thermionic cathode and an anode
the pole face, and conductive means constitut
structure of annular form having a circular cen
ing a part of said cathode shielding said insulator
ter opening Within which said cathode is lo
to prevent the deposition of conductive material
cated, a pair of magnetic pole pieces spaced on
thereon.
opposite sides of said anode structure, said pole
RALPH J. BONDLEY.
pieces each having therein a channel positioned
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