EGF-3104 / EGPS-3104
ELECTRON GUN / POWER SUPPLY200 eV to 20 keVMedium-Energy, Uniform Flood Electron Beam
FOR USE IN:
SPACECRAFT CHARGE-UP STUDIESSURFACE CHARGING STUDIESBETA DECAY SIMULATIONSURFACE PHYSICS STUDIESVACUUM PHYSICS EXPERIMENTS

FEATURES / OPTIONS:ENERGY RANGE: 200 eV to 20 keV
BEAM CURRENTS to 1 mA
WIDE ANGLE UNIFORM BEAM
DIVERGENCE CONTROLROTATABLE 2¾ inch CFF MOUNTING
USER-REPLACEABLE FIRING UNITCOMPUTER / REMOTE CONTROLCUSTOM APERTURES
EGF-3104 Electron Flood Gun mounted on a 2¾ inch CFF is rotatable, and has two
sets of six mounting bolt holes, one set tapped and one set clear, to allow a user
choice when mounting. All high voltage is totally enclosed in the multiconductor triaxial
20 kV cable and metal to metal shell connector.

The Kimball Physics EGF-3104 Electron Gun, with its matching
EGPS-3104 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 a
space-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). The yttria cathode is not damaged byrepeated exposure to atmospheric gases or water vapor when cold.
Cathode lifetime is a function of vacuum conditions and beam current
as related to cathode temperature. Cathode lifetime at low currents ingood vacuum may be in the many hundreds of hours, or even over athousand hours.

The EGPS-3104 Power Supply contains all power supplies necessary
to generate the required voltages to run an EGF-3104 Electron FloodGun, including the Energy, Focus, Source, Grid, and Anode supplies.
All power supplies are electronically regulated. A computer control
option allows for control of all potentials from an interface at ground
potential, via 0 to 10 V analog inputs.
The new 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 of
appropriate digital to analog converters. RS-422/485 conversion ispossible.
An optional LabVIEWTM computer program designed for the EGF-3104
is available for remote computer control and metering using National
Instrument DAQ boards and SCSI connectors on the EGPS-3104. The
program provides a virtual panel of controls and meters 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.

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

10EGF-3104 ELECTRON GUN SPECIFICATIONS

EGPS-3104 ELECTRON GUN POWER SUPPLY SPECIFICATIONSBEAM ENERGYBEAM CURRENT

200 eV to 20 keV (Independently adjustable)
Standard: 1 nA to 100 μA (Independently adjustable)
High current option: 10 nA to 1 mA

OUTPUTSAll necessary voltages to drive the EGF-3104 ElectronGun (in combination with H.V. Power Supply)

ENERGY SPREAD
SPOT SIZE

Approx. 0.4 eV cathode thermal spread, calculated
15 - 50 mm at 100 mm working distance (Ind. adj.)

ENERGY STABILITY
BEAM STABILITY±0.01% per hour ±0.02% per 8 hours at full output±0.1% per hour with Emission Current Control (ECC) or±10% per hour without ECC

BEAM UNIFORMITYFIRING UNITCATHODE TYPEMOUNTING
BEAM ALIGNMENT

Depends on mask aperture
User-replaceable Firing Unit Cartridge includes
cathode and Wehnelt (G-1) assemblyStandard: Refractory Metal Cathode
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.

INSERTION LENGTH

0 mm

GUN DIMENSIONS

70 mm OD x 205 mm length

FEEDTHROUGHSCABLES /CONNECTORS

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

MAXIMUM BAKEOUT

FlexPanel controls: Energy, Source, Grid (G-1), 1stAnode, Focus, Emission Current Control (ECC)
METERING
FlexPanel digital meters: Energy, Source Voltage, Source
Current, Grid Voltage, Anode Voltage, Focus Voltage,Emission Current
COMPUTER/REMOTE Power supplies: 0 to +10V (-10V to +10V, for deflection)
CONTROL & METER Metering: 0 to +2V (-2V to +2V, for deflection)
Toggle switches: 0 or +5V
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
DIMENSIONS
EGPS-3104: 17 in. x 7 in. x 22 in. excluding handles(width x height x depth) (432 mm x 178 mm x 560 mm); 19 in.(495 mm) rackmountable.
CONTROLSWORKING DISTANCE Variable
BEAM DEFLECTION
Optional: Magnetic quadrupole (outside vacuum) for
improved beam uniformity
PULSE CAPABILITY
Dual Grid Power Supply: pulse width ~2 μs to DC(using appropriate
rise/ fall ~500 ns, rep rate to 5 kHz (TTL required)pulse generator,not included)

WEIGHT

Appx. 35 lbs. (12 kg)

Typical performance;data for guidance only.

11It is not necessarily possible to achieve all maximum specifications
simultaneously. Specifications Subject to Change Without Notice.