Standard Series Barium Tungsten Dispenser Cathodes


Standard Series Dispenser Cathodes

  • 950-1200°C operation
  • Type 311 (532, 411, 612, M, Scandate by request)
  • 3-5A/cm2 CW emission
  • >15A/cm2 Pulsed emission
  • AL2O3 Insulation, molybdenum body
  • >>10,000 hours under ideal conditions
  • Both power leads electrically isolated
    from outer body
  • Non gassy
  • Available from stock
  • See below for the same units with support legs
  • Os/Ru (M Type), Os/W, Ir emission enhancing coatings available

Complete specifications

Standard Series Dispenser Cathodes With Support Legs

  • Same as the standard series cathodes but
    with added "tripod" support legs.
  • Excellent stability and thermal isolation
  • Beam current can go thru legs
  • Available from stock
Complete specifications

Modified Standard Dispenser Cathodes

  • Addition of legs, spherical radius, through hole, support sleeve or mounting base
  • Available in all sizes
  • See TB-198 for standard stock cathodes
  • See TB-176 for cathodes with mounting flanges
  • Os/Ru (M Type), Os/W, Ir emission enhancing coatings available

Model 101217 Ø.250" Dispenser Cathode with Support Sleeve

  • Ø.250" planar cathode
  • Thermally isolating Mo/Re support
  • One heater lead brazed internally
  • Available with spherical radius or micro tips
  • Available with base as Model 101439
  • Custom modifications of emitter face available;
    see #103409 as an example
Additional specifications

103409


#103409

Complete Specifications

Model 101157 Ø.134" Dispenser Cathode with Base



Optional Micro Tip #101300

Modified to include Ø0.063" emitter, #101750
  • Ø.134 planar cathode
  • Thermally isolating Mo/Re support
  • Mounting flange
  • One heater lead internally brazed
  • Available with spherical radius or micro tips
    (shown in inset, Model 101300 Ø.015" tip)
  • Approximately 4.7V, 1.1A @ 1050°C
  • See TB-176 for other flanged cathode sizes

Additional specifications

Model 101373 Ø0.250" Planar RF Gun Cathode


#101373

  • Ø.250" planar emitter
  • One heater lead internally brazed
  • Optional Ø.080" thru hole (101373-02)
  • See APS Main Injector for details about the APS Main Injector
    Upgrade Project which uses this cathode.
  • Designed for RF application
Complete drawing

Model 101033 Directly Heated Dispenser Cathode


#101033
Typical mounting of #101033 cathode

#101031
alternate support legs
  • Ø1/2" Coil
  • 40A electron current CW
  • 60A pulsed electron current
  • Plasma applications
  • 7.5 turns, Type 31180
  • 1/4", 3/8", 1/2", 5/8", 3/4" and custom diameter coils available
  • See TB-186 for detailed specifications


#104480 directly heated spiral cathode

Additional specifications

Model 101023 Duoplasmatron Hollow Cathode Assembly

  • Directly heated dispenser cathode emitter
  • Emitter capable of >40,000 hours at >40 Amps CW
  • Excellent stability and long life
  • Beam current can go thru legs
  • Durable Moly shield/housing and terminations
Complete drawing

Model 101936 Directly Heated Cathode


#101936 cathode on
header assembly to be #101926
(shown without outer housing)
  • 16.5 turn, Ø1/2", type 31180
  • 3-5 A/cm2 emission
  • Specialty plasma applications
  • Used in #101926 assembly
    (as shown in picture)

101926 Header Assembly
Additional specifications

Model 101870

  • Ø.786 x .709 SR
  • Type 61280M
  • Rear heat shields, support sleeve
  • One lead internally grounded
  • Typical opperation:
    7.2V, 8.7A @ 1050°C
    8.2V, 9.5A @ 1115°C

Additional specifications

Model 101350 Klystron Cathode

  • Ø3.54" x 2.569"SR Type 61280 Scandate
  • Non-inductive heater
  • Typical operation, 13.7V, 36A @ 1050°C
  • See TB-176 for other flange mounted cathodes
Additional specifications

Model 101229 Klystron Cathode

  • Ø3.12" x 2.723"SR Type 31180, 31180M, or 612X80 (Scandate)
  • Re-entrant support offers excellect thermal stability, expansion compensation and efficiency
  • Optional Non-inductive heater
  • Typical operation, 17.5V, 18A @ 900°C, 21.6V, 21A @ 1000°C, 24V, 22A @ 1050°C
Additional specifications

Model 101922 Ø1.012" x 0.866" SR Cathode/Heater with Shields


#101922

  • Side and rear shields
  • Type 61280 M
  • One heater lead internally brazed
  • Tab connection on lead
  • Mounting base
Complete Specifications

Model 101324

  • Ø3.51 Planar Accelerator Cathode
  • Type 61280M (Scandate available)
  • 1000A, 2µ second pulse, 5PPM
  • Also available with spherical emitter surface
  • 70,000 hour MTBF on similar cathodes
  • Non inductive heaters available
Additional specifications

Model 101186 Ø8.00" Planar Type M Cathode


  • Large area super power cathodes
  • Ø8.00" Planar DARHT cathode
  • Engineered for ▒ 5°C uniformity
  • Scandate and M coat options available
  • Ø6.5" is Model 101410
Complete drawing

Model 101506, Ring Cathode


#101506 (left) and #102510 (inset)
  • Type 61280 dispenser cathode
  • Ø2.126" OD x 0.157 wide emitter
  • Non inductive heater
  • One heater lead internally grounded
  • Hall Thruster application
  • 17V, 10A @ 1000C and 19V, 10.60A @ 1050C
Additional specifications

Model 101488 MIG Cathode

  • Ø3.05" OD x Ø2.90" ID
  • Type 61282M
  • Magnetron Injection Gun (MIG) cathode
  • Thermally isolated from forward and backward electrodes
  • Low thermal losses
  • Non-inductive heaters
  • Excellent uniformity
Complete drawing

Model 101281 MIG Cathode


Standard MIG Cathode (101281)
  • Ø6.228" OD x Ø5.491" ID x 9.461" R
  • Type 61282M
  • 42V, 28A @ 1030°C
  • Magnetron Injection Gun (MIG) cathode
  • Thermally isolated from forward and backward electrodes
  • Low thermal losses
  • Non-inductive heaters
  • Excellent uniformity

Custom MIG Cathode with Forward and Backward Electrodes
Complete drawing

104262 Ø4.600" Conical Surface


#104262

  • Type 31182
  • Includes inside heat shield
  • Internal heater
Complete Specifications

103823 Ø3.804 MIG Cathode/Heater Assembly


#103823

  • All bolted construction
  • #103773 includes forward and backward electrode
  • Replaceable filament heater
  • Type 61280
Complete Specifications

104053 Flange-Mounted Ring Cathode


#104053

  • Ø0.807 OD x Ø0.768 ID planar emitter
  • Water cooled flange
  • Multi-layer heat shields
  • Inner and outer focus electrodes
Complete Specifications

Model 102645 Ø0.250" Planar Cathode/Heater assembly with flange mount

  • 0.250" diameter Planar Cathode
  • Flange mount
  • Includes heat shield around cathode
  • GE Imatron eSpeed C300 Electron Beam Tomography Bodyscan scanner electron gun compatible
Additional specifications

Model 101474 Ø0.320" x 1.50" SR Cathode/Heater with Base

  • Type 61280
  • Linac research
  • Typical operation
    (bare cathode assembly):
    5.98V, 3.32A @ 950°C
    6.93V, 3.58A @ 1030°C
Additional specifications

Model 103167 Ø0.1024" x 0.1023" SR Cathode/Heater on Flange


#103167

  • Low power consumption
  • Added heat shield
  • Type 612X80
  • Hall thruster application
Complete Specifications

Model 103371 Ø.400" Cathode/Heater on Flange


#103371

  • Planar cathode
  • 2 3/4" CF flange
  • Heater power feedthrus
  • Emitter common to flange
  • Heat shield
Complete Specifications

Model 103570 Ø1.024" x 0.120" SR Cathode/Heater Assembly


#103570

  • Type 612X80
  • One lead internally brazed
  • Ø0.768" mounting flange
  • Outer heat shield
Complete Specifications

Model 104640 Ø0.1024" Cathode/Heater with Rectangular Mount


#104640

  • 0.120" spherical radius
  • Focus electrode/shield included
  • Rectangular mounting flange
  • One heater lead internally brazed
Complete Specifications

Model 102057 Ø0.134" Planar Cathode on Extended Flange


#102057

  • #101100 cathode/heater
  • Moly ruthenium coating (M type)
  • Spherical radii available
  • CF flange mount with single heater feedthru
  • Second heater lead and emitter common to CF flange
Complete Specifications

Model 102379 Ø1.181" Cathode/Heater on Flange


#102379

  • Type 61280
  • Ø1.7322" mounting flange
  • One lead internally brazed
  • Screw terminal lead connection
Complete Specifications

Model 101507, Cathode with Convex Spherical Radius

  • Ø0.400" with 0.263" SR (Convex)
  • Type 31180 Emitter
  • MoRe support sleeve and Moly mounting flange
  • Internal heater filament (bifilar option)
  • Mounting Flange
  • One heater lead internally grounded
  • 6.25V, 4.17A @ 1000C and 7.70V, 4.70A @ 1100C
Additional specifications

Model 103488 Ø0.079" Cathode/Heater with Focus Electrode


#103488

  • Screw mounted cathode
  • One heater lead internally brazed
  • Focus electrode for beam forming
Complete Specifications

Model 101242 Cathode

  • Ø0.375" Planar Type 61280 Scandate Emitter
  • Integral Focus Electrode
  • Toroid Heating Element
  • Thermally isolating and compensating re-entrant mount
Complete drawing

105205 0.053" x 0.252" Emitters


#105205

  • Made for 5 emitter array
  • Potted heater
  • One grounded heater lead
Complete Specifications

Model 101437 Rectangular Cathode


  • 1.969" x .472" x .787" R
  • Type 53280
  • Thermal isolation support
  • Integral heater
  • Planar or with cylindrical radius
  • Non-inductive heater
  • Sheet beam applications

Similar rectangular cathode/heater assembly

Complete drawing

103245 3.923" x 3.921" x 2.670" CR Sheet Beam Cathode


#103245

  • 2.67" Cylindrical radius (CR)
  • Shielded, custom support
  • Non-potted heater
  • Super power applications
Complete Specifications

Model 101460 Micro Rectangular Cathode


  • Micro Betatron emitter
  • .35" long x .059" wide
  • Type 61280M
  • Thermal isolation support
  • Integral heater
  • Planar or with cylindrical radius
  • Sheet beam applications
Complete drawing

Model 102697 Sheet Beam Cathode


#102697

  • Ø0.500" emitter with 0.533" cylindrical radius
  • Matching focus electrode with cylindrical radius
  • One lead internally brazed
  • Type 61280
Complete Specifications

Models 101262, 101263, 101264 AEI Mount Point Emitters


Model 101262
  • Tungsten Filament
  • Precision, annealed tips
  • Ceramic mount
Model 101263
  • Barium Oxide emitter
  • Ø840 micron tip
  • Low temperature operation
  • Ceramic mount
Model 101264
  • Tantalum emitter
  • Ø840 micron tip
  • Ceramic mount

Model 101420, Directly Heated Cathodes

  • Hairpin design
  • Barium dispenser, Oxide, Lab6, W
  • Re wire support
Additional specifications

101902 Directly Heated Cathode


#101902

  • Hairpin design
  • Ø.040" emitter
  • Type 61280
  • Re-leads
Complete Specifications

Model 101053 Hollow Cathode


101053 Hollow Cathode

101053 Hollow Cathode without shield
  • Type 61280 emitter
  • Indirectly heated
  • Plasma spray Alumina heater insulation
  • Bifilar non-inductive heater
  • 1/8" gas port
  • Shown without heat shield and keeper electrode


Close-up of heater/tube
Complete drawing

Model 101220 Directly Heated Hollow Cathode


101220 Directly heated hollow cathode
Complete drawing

Model HWPES-250 Hollow Cathode Plasma Source


HWPES-250


HWPES-375
  • 10A electron current
  • Also available -375 (0-25A), -500 (0-50A)
  • Plasma neutralizing or enhancement
  • Low temperature operation
  • See TB-173 for detailed specifications

Model 101732 Hollow Cathode


  • Tantalum Emitter
  • Available with external heater and shields
  • Keepers available
  • Plasma enhancement and neutralizing applications
  • Various tip options
Complete drawing

Hollow Cathode Inserts

  • Barium dispenser cathodes
  • Optional Rhenium leads
  • Precision OD
  • Space applications

Model 101296 (shown, left)
  • Ø.0945" OD x .039" ID x .512" long
  • Ø.015 Re leads (2)
  • Type 61280
Model 101433 (shown, right)
  • Ø.420" OD x .320" ID x 1.00" long
  • Ø.025 Re leads x 5" long (2)
  • Type 61280
Model 102654 (not shown)
  • Ø.865" OD x .750" ID x 1.50" long
  • Ø.025 Re leads x 5" long (2) (-01, no leads, -02 with leads)
  • Type 61280
Model 101302 (not shown)
  • Ø.2115" OD x .149" ID x 1.005" long
  • No leads
  • Type 61280 (-01), 411X80 (-02)
Model 101320 (not shown)
  • Ø.079" OD x .040" ID x .625" long
  • No leads

Model 102812 Field Emission Cold Triode Cathode ATC-SR Series


Model 102812
  • Cubic cathode body and rectangular emission area
  • 12mm Width X 15mm Length X 15mm Height
  • Field emission film active area up to 3mm X 10mm
  • Field emission current transmission rate range:
    up to 80%
  • Complete Specifications

Model 102813 Field Emission Cold Triode Cathode ATC-CR Series


Model 102813
  • Ø20mm, Cylindrical body
    and rectangular (5mm x 10mm) emission area
  • Field Emission current range:
    up to 5mA in continuous DC mode
  • Field emission current transmission rate range:
    up to 80%
  • Complete Specifications

Model 102815 TO-5 Field Emission Cold Triode Cathode HX Series


Model 102815
  • TO-5, 5 pin header mount body
    and Ø9mm emission area
  • Field Emission current range:
    100uAmps
  • Field emission current transmission rate range:
    up to 60%
  • Complete Specifications

Model 102811 Field Emission Cold Triode Cathode ATC-CC Series


Model 102811
  • Ø1/2", Cylindrical body
    and circular emission area
  • Field Emission current range:
    up to 5mA in continuous DC mode
  • Field emission current transmission rate range:
    up to 80%
  • Complete Specifications

Model 101381 Tip Emitter

  • Ø.004" (0.1mm) tip
  • Type 31182 emitter
  • Denka mount
  • LaB6 replacement
Complete drawing

Model 102248 and 102170 Single Crystal LaB6 Cathodes


Model 102248-01 Ø2.0mm


Model 102248-02 Ø2.8mm
  • Single Crystal LaB6 (Lanthanum Hexaboride) emitter
  • Directly heated construction
  • Can include 102170 flange mount with shield/focus electrode
  • For Additional Handling and Operation Notes



    Model 102170 Includes 102248 Cathodes

106506 Multi-Beam Cathode Assembly


#106506



#106506

  • 19 each Ø0.024" emitters
  • Integral heater
  • Thermal efficient support sleeve
  • One lead internally brazed
  • Multi-beam klystron applications
Complete Specifications

104973 Ø1.000" Water Cooled Cathode Electrode


#104973

  • Type 61280
  • Thermal energy conversion application
Complete Specifications

Model 107350 Ø1.0" Copper Cathode/Heater Assembly


#107350

Complete Specifications

Model 103364 CRT Cathode Assemblies


#103364

  • Various cathode diameters and emitter types
  • Ceramic mounts
  • With or without heaters

106638 Tantalum Cathode Assembly


#106638

  • Concave tantalum emitter
  • Various emitter diameters
  • Various aperture diameters
Complete Specifications

Model 004051945B1 Ion Implanter Arc Chamber Electrode

  • Tungsten electrode
  • Molybdenum body
  • Custom moly/ tungsten electrode emitter configurations

103239 Z Stage Mount for 103240 LaB6 Cathode


#103239 shown with #103240 LaB6
cathode/heater installed

  • Ø0.138" Single Crystal LaB6 emitter
  • Integral heater
  • +/- 0.25" Z adjustment included with the #103239 assembly
Complete Specifications (#103293)
Complete Specifications (#103240)

104848 Ø0.69" LaB6 Flange Mounted Cathode


#104848

  • Polycrystalline LaB6 emitter
  • 2 3/4 CF flange with power and bias feedthru
  • Tantalum side and rear shields
Complete Specifications

102331 Magnetron Cathode


#102331

  • 0.150" - 0.315" wide emitters available
  • Ø.888 - Ø.980 diameters available
  • Internal heater
  • "Snap in" mounting
Complete Specifications

102387 Directly Heated Magnetron Cathode


#102387

  • Ø0.511" coil, 12T
  • Ø0.0472" with 1% Th/W emitter
Complete Specifications

Grids


  • Planar and formed shapes available
  • Etched and Woven Mesh Grids
  • Materials include Molybdenum, Tungsten, Hafnium and Copper
  • Other materials and
    coatings available
  • Non Emissive Materials and Coatings
  • Stock Moly Materials of various transparencies
  • See TB-172 for detailed specifications

Reference Documents

TB-117 Emission Characteristics of "M Type" Dispenser Cathodes

TB-119 Emission Characteristics For Scandium Type Dispenser Cathodes

2002 Cathode Life Test Facility Annual Report, TriService/NASA

Using multispectral imaging to measure temperature profiles and emissivity of large thermionic dispenser cathodes/Los Alamos Labs

Thermal Imaging and Current Emission Measurements On a Large Thermionic Dispenser Cathode/Los Alamos Labs

TB-123 Design Concepts for High Temperature Cathode and UHV Sample Heater Packages

TB-134 Practical Aspects of Modern Dispenser Cathodes

TB-135 Modern Dispenser Cathodes - Cronin

"Electron Beam Formation, Focussing and Collection in Microwave Tubes," Handbook of Microwave Technology, R. True - available by request

TB-147 Processing and Handling of Dispenser Cathodes

TB-128 Notes on Dispenser and Oxide Cathodes

TB-160 thru 164 Processing and Specifying Oxide Cathode Coatings

Optical Pyrometers

TB-183 Electron Optics Simulation - available by request

TB-172 Standard Electron Grids

TB-201 Electron Gun Opening Procedure - available by request

TB-227 Reducing Boron Embrittlement of Tungsten Cathodes