Emitters (Cathodes, Filaments): PRODUCT GUIDE
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LaB6 cathode
on a standard ceramic AEI base |
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Kimball Physics
emitters provide a reliable source of electrons
or ions for use in
a variety of instruments including scanning electron microscopes (SEM)
, transmission electron microscopes (TEM), probes, electron
lithography systems, free electron lasers, as well as Kimball
Physics electron and ion guns.
Many cathodes are
resistively-heated, thermionic electron sources. Kimball Physics
offers refractory metal, oxide, and single crystal cathodes:
Tantalum (Ta)
disc cathodes, tungsten (W) filaments,
barium oxide (BaO) coated
discs, yttria (Y2O3) coated
iridium filaments and cathodes, and high-brightness single-crystal
lanthanum hexaboride (LaB6).
Cathodes are available
mounted on a standard AEI base, or the more compact Kimball
Physics (CB-104) base, or on a variety of bases
for electron microscopes. Cathodes may also be mounted on customer-supplied
bases. Most bases are high tolerance ceramic: pins are
usually kovar, but may also be available in molybdenum (for
field-free regions).
Firing units containing the appropriate cathode
or ion source are
available for all mounted Kimball Physics units (when ordering, specify
by electron or ion gun model and any special options, such as high current or small
spot).
For part numbers and
prices see the Emitters
Part Number Tables.
For additional
technical information on LaB6
and other cathodes, see Technical
Notes.
It is not necessarily possible to achieve all maximum
specifications simultaneously. Specifications subject to
change without notice. |
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Filaments
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Disc cathodes |
LaB6
cone / microflat single-crystal |
Lab6 large planar
single-crystal |
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LaB6
cathode on a Kimball Physics Compact Base CB-104
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Click on
a picture for a larger view.
Click on an underlined emitter type for its PDF specification pages.
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Small diameters with microflats
High brightness
106A/cm2/ster, 10-7torr
Small spot, Long lifetime
Emission >50ľA
(15 micron flat)
Available on many bases
Part Numbers &
Prices |
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NEW
Larger diameters
High cathode loading
30A/cm2, 10-7torr
Long lifetime
Emission currents up to 0.5A
On AEI or Custom mounting
Part Numbers &
Prices
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General purpose / microscopy
0.05-1.0A/cm2, 10-5torr
Emission from tip up to 50ľA
Available on many bases
Sold in box of ten on glass AEI or singly on ceramic AEI base
Part Numbers &
Prices |
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LaB6
Cathodes and Tungsten Filaments
for ELECTRON MICROSCOPY (SEM and TEM)
Styles to fit most SEMs
and TEMs.
For a list of microscopy instruments and manufacturers, see
Part Number Tables
For retail microscopy orders in North America, please contact our
exclusive retail distributor:
Barry Scientific
Inc. (1-800-348-2257)
For overseas retail orders, please contact our overseas agents, see List
of Agents.
For OEM or large batch orders
in the US or overseas,
please contact
Kimball Physics directly (1-888-546-7497).
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General purpose
Area source
0.05-1.0A/cm2,
10-5torr
Emission up to tens of mAs
4 disc sizes
On AEI or CB-104 bases
Part
Numbers & Prices |
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NEW
SIZES
Low light
Low temperature
0.25A/cm2,
10-7torr
Emission up to 3mA
3 disc sizes
On AEI or CB-104 bases
Part Numbers & Prices |
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NEW
Chemically resistant,
survives brief vacuum loss,
10-4torr,
Low work function
Disc 2.5A/cm2,
Hairpin 4A/cm2
Disc emission up to 10mA
3disc sizes, AEI or CB-104
Part Numbers &
Prices |
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 Cathode
types below link to PDF specification pages. If you need a PDF
reader, click the Adobe logo to download it now.
Pictures link to larger versions.
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