EMG-4212 / EGPS-4212
ELECTRON GUN / POWER SUPPLY

1 keV to 30 keV
Small Spot Collimated Beam, Alignment during Operation, Higher Current Option
FOR USE IN:MBE RHEED STUDIESELECTRON DIFFRACTIONSPACE PHYSICS STUDIESGAS ELECTRON FLUORESCENCE
X-RAY GENERATIONHEATING / MELTING / WELDINGVACUUM PHYSICS EXPERIMENTS

FEATURES / OPTIONS:NEW MODULAR DESIGNINTERNAL ALIGNMENT WHILE OPERATINGCOLLIMATED BEAM
SMALL SPOT OPTION DOWN TO 100 μm
HIGHER CURRENT OPTION uP TO 1 mA
ELECTROSTATIC FOCUSING & DEFLECTIONUHV COMPATIBLE / BAKEABLECOMPUTER / REMOTE CONTROLUSER-REPLACEABLE FIRING UNITS
EMG-4212A Electron Gun with 4½ CF mounting flange
The Kimball Physics EMG-4212 Electron Gun, with its matching
EGPS-4212 Power Supply, is a multi-purpose modular Electron Gun
with applications in many areas. The EMG-4212/ EGPS-4212 is acomplete subsystem ready to attach to a user's vacuum system andturn on. The gun has the capability of producing a collimated, small
spot or flood electron beam.
Beam current, beam divergence, and beam energy are all adjustable
over wide ranges. The energy can be varied from 1 keV to 30 keV. The
beam current and spot size range depend on the system option asshown in the table below. With the various refractory metal disccathodes, the beam current is independently adjustable from 1 nA to100 μA. With a small spot option using a lanthanum hexaboride
cathode, the gun can deliver spots down to 100 μm. With a highcurrent option, beam currents up to 1 mA can be obtained. Rasteringis also available as an option.
The modular design of the EMG-4212 allows either the firing unit
assembly or the lens assembly to be replaced. The firing unit cartridge(including the cathode, cathode-mount, and Wehnelt aperture) is userreplaceable without removing the entire gun from the vacuum chamber.
The anode is also replaceable. The cathode to anode spacing isinternally adjustable to vary perveance.
The gun features an adjustable cathode feedthrough assembly thatallows the mechanical alignment of the firing unit with respect to theanode and the column. This alignment can be done in real time while
the gun is operating at full voltage with beam on.

UHV technology is used throughout. The gun can be run in vacuums
from 10-11 torr up to 10-5 torr for the standard Ta disc cathode. The
electron gun is bakable to 350°C with cables removed.
Several cathode types are available to provide different system
options: standard tantalum disc cathodes (Ta), single-crystal lanthanum
hexaboride (LaB6, small spot, high brightness, min. vacuum 1x10-7torr), barium oxide discs (BaO, low light, low energy spread, min.
vacuum 1x10-7 torr) and yttria-coated iridium discs (Y2O3 - Ir, rugged,
vacuum up to 10-4 torr). With the exception of BaO, the cathodes are
not damaged by repeated exposure to atmospheric gases or water
vapor when cold.
Firing unit cartridges are user-replaceable, and used cartridges may bereturned to the factory for rebuild. The electron gun itself may also besent back to the factory for complete disassembly, cleaning, and rebuildof the firing unit assembly (including installation of a new cathode).
The EGPS-4212 Power Supply features a modular design withminiaturized power supply clusters, optically isolated signals, and thenew FlexPanel digital interface controller. The included power supplies
are Beam Energy, Focus, X,Y Deflection and optional Beam Blanker,
as well as the floating Source/ECC and Grid supplies. The system
includes a separate High Voltage Power Supply connected to andcontrolled by the EGPS-4212. A rastering option can be provided byan additional separate power supply unit, the Raster Generator
Deflection Unit (RGDU).
The new FlexPanel provides a digital display screen and a keypad forprogramming control on the front panel. Rear panel connectors allow
remote /computer control and metering of all gun power supplies. An
RS-232 serial port and an analog input/output connector are included
on standard power supply units. All common computer interface bus
types can be accommodated, by use of appropriate digital to analog
converters. RS-422/485 conversion is possible.

EGPS-4212A Electron Gun Power Supply with FlexPanel controller
Toll Free: 1 888 KIM-PHYS (1 888 546-7497) e-mail: info@kimphys.com
Tel. 1 603 878-1616 Fax: 1 603 878-3700

An optional LabVIEWTM computer program designed for theEMG-4212 is available for remote computer control and metering using
National Instrument DAQ boards and SCSI connectors on theEGPS-4212. The program provides a virtual panel of controls andmeters on the user’s computer screen.

22EMG-4212 ELECTRON GUN SPECIFICATIONS

EGPS-4212 ELECTRON GUN POWER SUPPLY SPECIFICATIONSBEAM ENERGYOUTPUTSBEAM CURRENTENERGY SPREAD
BEAM DIVERGENCE
SPOT SIZE
WORKING DISTANCE
BEAM DEFLECTIONPULSE CAPABILITY(using appropriate
pulse generator,not included)
BEAM UNIFORMITYFIRING UNITCATHODE TYPESINTERNAL GUN
ALIGNMENTMOUNTING
INSERTION LENGTHGUN DIMENSIONSFEEDTHROUGHSCABLES /CONNECTORSMAXIMUM BAKEOUT

1 keV to 30 keV (Independently adjustable)
Standard: 10 nA to 100 μA (Independently adjustable)
Small Spot option: 1 nA to 10 μA
High Current option: 1 μA to 1 mAApprox. 0.4 eV cathode thermal spread, calculated
Collimated beamStandard: 500 μm to 25 mm
Small Spot option: 100 μm to 10 mm
High Current option: 1.5 mm to 25 mm
Typical: 150 mm. Range: 100 mm to 1000 mm
4 Pole Electrostatic: ± 2° at 30 keV; scales larger atlower energies
Optional Dual Grid Power Supply: pulse width 2 μs toDC, rise/ fall 500 ns, rep rates to 5 kHz (TTL required)
Note: with High Current option, Grid may not cut off
beam at higher energies
Gaussian
Customer-replaceable Firing Unit Cartridge includes
precision-aligned cathode and Wehnelt (G-1) assemblyStandard: Tantalum disc
Optional: Lanthanum hexaboride (LaB6),Barium oxide (BaO), Thorium oxide (ThO2)
or Yttrium oxide (Y2O3) Cathodes not harmed byrepeated exposure to atmospheric gases while cold
Adjustable Feedthrough for mechanical alignment offiring unit while gun is operating
Flange Multiplexer with a 4½ inch CFF, including both
tapped and clear mounting holes
Standard: 51 mm
Gun length in vacuum: 51 mm sealing surface to end,
51 mm dia. Outside vacuum: 258 mm sealing surface toend of cable (313 mm with blanker)
Multipin brazed ceramic, threaded stainless steel shell
Multiconductor 30 kV high voltage fully ground-shieldedcable, 20 kV focus cable, and low voltage deflection
cable, with mating aluminum connectors, to connect gunand power supply. Standard lengths: 3 m, Optional: 5 m
350°C with cables removedAll necessary voltages to drive the EMG-4212 Electron
Gun (in combination with H.V. Power Supply)<0.01% per hour with 0.05% rms ripple at full output

ENERGY SUPPLYSTABILITYBEAM STABILITYCONTROLSMETERINGCOMPUTER/REMOTE
CONTROL & METER±0.1% per hour with Emission Current Control or±10% per hour after warm up without ECC
FlexPanel controls: Energy, Source, Grid, Focus,
X and Y Deflection, Emission Current Control, Optional
Blanker Voltage
FlexPanel digital meters: Energy, Source Voltage,
Source Current, Emission Current, Grid, Focus, X and YDeflection, Optional Beam Dump Current
Power supplies: 0 to +10 V (-10 V to +10 V, deflection)
Metering: 0 to +2 V ( -2 V to +2 V, deflection)
On/off switches: 0 or +5 V
Standard 50-pin connector for analog input/output andRS-232 serial port (RS-422 or RS-485 available, if
specified at time of order)
Optional: SCSI metering and programming connectors

Optional: National Instruments LabVIEWTM file, designedto run with computer DAQ boards NI 6034E and NI 6703
COMPUTER SYSTEM Optional: Industrial computer system including dataacquisition and control hardware DAC.
INPUT
115 VAC switchable to 230 VAC, 50 to 60 Hz single
phase, 250 VA
ENVIRONMENT
Temperature: 0 to 40ºC, Relative humidity: 0 to 75% RH
non condensing,Classified as a pollution degree 2, installation category(overvoltage category) II environment unit
DIMENSIONS
Two units, total approx: 17 in. x 12.2 in. x 22 in.
(width x height x depth) excluding handles (425 mm x 310 mm x 560 mm);
19 in. rack mountable
SOFTWARE

OPTIONAL RGDU-4A RASTER GENERATOR SPECIFICATIONS
10 separate frequency selections for both X and Y
RASTER GENERATOR (X up to 1000 Hz, Y up to 50 Hz) Variable position
offset (centering). Variable window size. All controllable
remotely via RS-232, RS-422, RS-485, or analog input.
DIMENSIONS
17 in. x 3.5 in. x 22 in.excluding handles(width x height x depth) (425 mm x 90 mm x 560 mm); 19 in. rack mountable

258

420

51
100 TO1000117

138

150R

51

A typical lab set-up of a complete Kimball Physics system withpower supplies, electron gun, and optional computer controlsystem

EMG-4212 ELECTRON GUN(Dimensions in mm)

0.125 XTypical performance;data for guidance only.

Copyright © 2006 by Kimball Physics, Inc. 06/22/06

It is not necessarily possible to achieve all maximum specifications
simultaneously. Specifications Subject to Change Without Notice.