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

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

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

103409

#103409

Modified #101217 cathode/heater 0.040" wide x 0.118" long emitter Type 31180 Braze sealed side areas

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 #107741 (#101157-05 on FE/stalk assembly)

Model 101373 Ø0.250" Planar RF Gun Cathode

#101373 #102031

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 #101975 #101409

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

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

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

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

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

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

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

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

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

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

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

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

104262 Ø4.600" Conical Surface

#104262

Type 31182 Includes inside heat shield Internal heater

103823 Ø3.804 MIG Cathode/Heater Assembly

#103823

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

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

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

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

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

#103167

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

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

Model 103570 Ø0.1024" x 0.120" SR Cathode/Heater Assembly

#103570

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

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

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

Model 102379 Ø1.181" Cathode/Heater on Flange

#102379

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

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

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

#103488

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

Model 101242 Cathode

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

105205 0.053" x 0.252" Emitters

#105205

Made for 5 emitter array Potted heater One grounded heater lead

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

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

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

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

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

101902 Directly Heated Cathode

#101902

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

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

Model 101220 Directly Heated Hollow Cathode

101220 Directly heated hollow cathode

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

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

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

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

104973 Ø1.000" Water Cooled Cathode Electrode

#104973

Type 61280 Thermal energy conversion application

Model 107350 Ø1.0" Copper Cathode/Heater Assembly

#107350

Type K thermocouple "Plug in" design RELATED PRODUCTS Temperature Controllers and Power Supplies Hook-Up Components, Hardware Thermocouples Sample Clips Feedthrus, Flanges, Fittings Reference Documents

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

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

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

102331 Magnetron Cathode

#102331

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

102387 Directly Heated Magnetron Cathode

#102387

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

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

TB-147 Processing and Handling of Dispenser Cathodes

TB-172 Standard Electron Grids

TB-227 Reducing Boron Embrittlement of Tungsten Cathodes