EGF-4104 / EGPS-4104
ELECTRON GUN / POWER SUPPLY
200 eV to 30 keVMedium-Energy, Uniform Flood Electron Beam
FOR USE IN:
Spacecraft charge-up studies
Surface charging studies
Beta decay simulation
Surface physics studies
Vacuum physics experiments

FEATURES / OPTIONS:
Energy range: 200 eV to 30 keV
Beam currents to 1 mA
Wide angle uniform beam
Divergence control
Rotatable 2¾ CF mountingUser-replaceable firing unitComputer / Remote control
Custom apertures

The Kimball Physics EGF-4104 Electron Gun, with its matching
EGPS-4104 Power Supply, is intended for use in a variety of UHV
charging, space physics, vacuum physics, surface physics, andnuclear simulation applications. It is a complete subsystem ready toattach and turn on. Maximum flexibility is achieved in a minimum ofspace; the entire unit mounts through a single standard 2¾ inch CFport.

Electrons are generated at negative high potential, and the user’s
target is typically set at ground potential. Both beam energy and beam
current are adjustable over wide ranges. The gun uses aspace-charge-limited refractory-metal cathode to generate a uniform
flood beam and the design allows generation of the beam down to low
energies, and very low currents. A high current option provides beam
currents up to 1 mA. Beam divergence is partially controllable
electronically over the full range of the electron energy.

Optional cathodes include barium oxide discs (BaO, low light, lowenergy spread) or yttria-coated iridium discs (Y2O3 - Ir, rugged, may
survive brief loss of vacuum). With the exception of barium oxide,
cathodes are not damaged by repeated exposure to atmosphericgases or water vapor when cold. Cathode lifetime is a function ofvacuum conditions and beam current as related to cathodetemperature. Cathode lifetime at low currents in good vacuum may bein the many hundreds of hours, or even over a thousand hours.

EGF-4104 Electron Flood Gun (shown with Deflection option)

The EGPS-4104 Power Supply contains all power supplies necessary
to generate the required voltages to run an EGF-4104 Electron FloodGun, including the Energy, Focus, Source, Grid, Anode and optional
Deflection supplies. All power supplies are electronically regulated.
A computer control option allows for control of all potentials from aninterface at ground potential, via 0 to 10 V analog inputs.
The FlexPanel provides a digital display screen and a keypadcontroller for programming 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 ofappropriate digital to analog converters. RS-422/485 conversion ispossible.
An optional LabVIEWTM computer program designed for theEGF-4104 is available for remote computer control and metering.
Software is available in two types: Using National Instrument DAQ
boards and SCSI connectors on the EGPS-4104, or via a simple serial
connector interface. The program provides a virtual panel of controls
and real-time metering on the user’s computer screen.

UHV technology is used throughout. The gun may be completely
disassembled for cleaning and repair. The cathode firing unit assembly(which includes the cathode, cathode mount, apertures, and Wehnelt)
is user-replaceable; and the firing unit assemblies may be sent back to
Kimball Physics for rebuilding. The gun can be run in vacuums from
10-11 torr to 10-5 torr. The gun may be baked up to 350°C with cables
removed. Non-standard mountings are available. Various designs ofstand-alone Faraday cups are available.
EGPS-4104B 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

EGF-4104 ELECTRON GUN SPECIFICATIONSBEAM ENERGYBEAM CURRENTENERGY SPREAD
SPOT SIZE
WORKING DISTANCE
BEAM DEFLECTIONPULSE CAPABILITY(using appropriatepulse generator,not included)
BEAM UNIFORMITYFIRING UNITCATHODE TYPEMOUNTING
BEAM ALIGNMENTINSERTION LENGTH

200 eV to 30 keV (Independently adjustable)
Standard: 1 nA to 100 μA (Independently adjustable)
High current option: 10 nA to 1 mA*Approx. cathode thermal spread, calculated
BaO - 0.3eV
Ta - 0.5eV
Y2O3 - 0.4eV
Typical - 15 to 450+ mm
Typical - 100 to 1000 mm
Optional: Magnetic quadrupole (outside vacuum)
Dual Grid Power Supply: pulse width ~2 μs to DC
rise/ fall ~500 ns, rep rate to 5 kHz (TTL required)
Variable. Optional beam washing or mask aperture
User-replaceable Firing Unit Cartridge includes
cathode and Wehnelt (G-1) assemblyStandard: Tantalum
Optional: Low-light Barium Oxide
Yttria-coated Iridium
2¾ inch rotatable CF, including both tapped and clear
mounting holes
Mechanical alignment with internal firing unit alignment.
Optional mechanical alignment with a ± 2° Port Aligner.
0 mm

GUN DIMENSIONS

85 mm OD (excluding Lemo connector) x 205 mm

FEEDTHROUGHSCABLES /CONNECTORS

Multi-pin
length brazed ceramic, threaded stainless steel shell
Multi-conductor high voltage fully ground-shielded cablewith mating aluminum shell connector, to connect gun
and power supply. Standard length: 3 m, Optional: 5 m
350°C with cables removed

MAXIMUM BAKEOUT* High current option requires seperate HV supply (included withsystem), connected to EGPS power supply

EGPS-4104 ELECTRON GUN POWER SUPPLY SPECIFICATIONSOUTPUTAll necessary voltages to drive the EGF-4104 ElectronGun (in combination with H.V. Power Supply*)

ENERGY STABILITY
BEAM STABILITY±0.01% per hour ±0.02% per 8 hours at full output

WEIGHT

Appx. 35 lbs. (16 kg)±0.1% per hour with Emission Current Control (ECC) or±10% per hour without ECC
FlexPanel controls: Energy, Source, Grid (G-1), 1stCONTROLS
Anode, Focus, Emission Current Control (ECC), Optional
X and Y Deflection.
FlexPanel digital meters: Energy, Source Voltage, Source
Current, Grid Voltage, Anode Voltage, Focus Voltage,METERING
Emission Current, Optional X and Y Deflection
COMPUTER/REMOTE Controls : 0 to +10V (-10V to +10V, for deflection)
CONTROL & METER Metering: 0 to +2V (-2V to +2V, for deflection)
Toggle switches: 0 or +5V
SOFTWARE
Standard configuration designed for RS-232
connections.
Optional: National Instruments LabVIEWTM file,designed to run with computer DAQ boards NI
PCI-6733 and PCIe-6341. SCSI interface
115 VAC or 230 VAC, 50 to 60 Hz single phase, 250 VA
INPUTENVIRONMENT
Temperature: 0 to 40ºC, Relative humidity: 0 to 75% RH
non condensing,Classified as a pollution degree 2, installation category
DIMENSIONS
EGPS-4104: 17 in. x 7 in. x 22 in. excluding handles(width x height x(432 mm x 178 mm x 560 mm); 19 in.(495 mm) rackmountable.
depth)OPTIONAL RASTERING / BEAM WASHING SPECIFICATIONSFrequency in X and Y directions can be independently
RASTER GENERATOR set. X freq. is up to 500 Hz, Y freq. 100Hz. When X freq.
exceeds 100Hz the raster angle is reduced by 25%.
All parameters controllable via RS-232, RS-422, RS485, analog input, or computer control with LabVIEWTM
software option.

EGF-4104 gun and source cable assembly shown with optional deflection

Typical performance;data for guidance only.

It is not necessarily possible to achieve all maximum specifications
Copyright© 2015 by Kimball Physics, Inc. 05/20/15 simultaneously. Specifications Subject to Change Without Notice.