RHEED guns from STAIB Instruments provide dedicated electron optics systems for diffraction studies.
Energy range 500 eV to 15 keV
Beam current max. 2 µA
Beam size min. 5 µm at low current and max. energy
Basic beam blanking
The unique design of STAIB’s electron sources has several advantages over the classic triode gun configuration.
Beam blanking is one such advantage. The beam can be switched on and off electrically by preventing electrons from being extracted from the filament. This method avoids the generation of stray electrons.
The basic beam blanking option (standard on all STAIB RHEED systems), allows the beam to be turned on and off manually.
Additionally the full beam blanking option is available. Here the electron beam can be turned on and off using a BNC input via a TTL type input.
The full beam blanking option can be used to keep the electron load on the sample very low. The electron bombardment of sensitive surfaces can be kept to a minimum. The blanking signal can also be triggered synchronously with external signals to improve the use of the electron source in the presence of stray magnetic fields by compensating their effect. The external trigger can also be utilized to synchronize with rotating samples, which is important for in-situ monitoring in some deposition techniques.
Electron sources from STAIB produce an electron beam that can be pulsed to produce sharp power pulses up to the microsecond range. Applications include sample annealing, heat treatment, evaporation, heat shocks, and luminescense studies.
Customization is available to meet the needs of specfic experiments. Beam pulsing is available on all focusing electron sources offered by STAIB Instruments. Several standard pulsing options are available to cover a wide range of frequencies. Additional ranges of pulse widths are available on request.
Fast pulsing systems
Several standard pulsing units are available to cover a large range of frequencies. Other ranges of pulse width are available upon request. Pulsing to 100 Hz can be provided as an option to the electron source power supply. Beyond this frequency, in addition to the electron source and power supply, a pulsing unit and a special high voltage cable that provides an input from the pulse unit (a pulse control signal) are needed. The pulsing unit has an internal clock or allows an external TTL pulse signal to give it a reference signal.
The computer control option for STAIB electron guns consists of two parts.
1: Power supply computer control plug
The electron source power is equipped with an optional computer connection plug for analog control signals. The control voltages can either be provided by 3rd party software through a suitable DAC interface, or by the STAIB computer control module. The electron source system can either be operated using the manual control dials, or by using the optional computer control.
2: STAIB computer control module
The computer control option provides the cables, and interface hardware to connect to the computer control plug. The STAIB software sends the input signals to the power supply to control the various system functions. Full parameter sets can be stored, modified, and reused. The advanced version of the STAIB source controller can retrieve and copy the adjusted values from the manual control dials, providing the user with a to date unknown ease of use.
The option runs under the Windows™ XP, Windows™ 7, Windows™ 10 operating system, using a USB connection.
The RHEED gun controller includes an Interface Module and a Software Package, and makes use of the RHEED very precise and repeatable. User’s parameters can be saved and retrieved, the beam can be turned on and off using the beam blanking option, and the incidence angle can be adjusted using the beam rocking feature.