Standard Series Barium Tungsten 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

• 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

• 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

• 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

• 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

• 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

• 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

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

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

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

• Tungsten Filament
• Precision, annealed tips
• Ceramic mount

• Barium Oxide emitter
• Ø840 micron tip
• Low temperature operation
• Ceramic mount

• Tantalum emitter
• Ø840 micron tip
• Ceramic mount

• 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

• 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

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

• 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

• 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

• 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

• 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

• 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

• Ø3.54" x 2.569"SR Type 61280 Scandate
• Non-inductive heater
• Typical operation, 13.7V, 36A @ 1050°C

• 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

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

• 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

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

• 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

• Directly heated emitter
• Type 61280
• Low resistance heating
• 0-10 A CW electron emission
• Ar, Xe, H2 compatible
• For system with power supply see HWPES-250

• 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

• 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

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

• 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

• 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

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

• Ø.250" planar emitter
• One heater lead internally brazed
• Optional Ø.080" thru hole (101373-02)
• See TB-176 for dimensional information and other flanged cathodes
• See APS Main Injector for details about the APS Main Injector
  Upgrade Project which uses this cathode.

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

• 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

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

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

• Ø.0945" OD x .039" ID x .512" long
• Ø.015 Re leads (2)
• Type 61280

• Ø.420" OD x .320" ID x 1.00" long
• Ø.025 Re leads x 5" long (2)
• Type 61280

• 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

• Ø.2115" OD x .149" ID x 1.005" long
• No leads
• Type 61280 (-01), 411X80 (-02)

• Ø.079" OD x .040" ID x .625" long
• No leads

Several examples of dispenser cathodes with support sleeves and mounting flanges are shown. Each has other features, coatings and/or configurations that may be unique. Detailed specifications including emitter type, coating type, Vf, If, Tk data, etc. are available by request. Many shown are available from stock.

• 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