Electrostatic Dose Modulator (EDM)

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Electrostatic Dose Modulator (EDM)
  • Lightning-fast speeds:

    EDM systems achieve switching times faster than 50 ns.
  • Independent intensity adjustment:

    By rapidly turning the beam on and off with variable pulse widths, the EDM makes it easy to adjust the average beam intensity without changing the image conditions. A desktop accessory knob provides an intuitive interface to adjust the dose attenuation factor.
  • Dose structuring:

    Users can take control of their illumination by applying dose in pulses with variable durations as short as 100 ns and frequencies up to 1 MHz.
  • Modern control software:

    The EDM works out of the box as a fast beam blanker. Control software is included for programmable dose attenuation, logging, and more.
  • Integration:

    The EDM act as a fast reliable pre-sample beam blanker while supporting a companion Relativity Sub-Framing System as well as third-party hardware.

Pulsed beam TEM illumination*

pulsed beam TEM illumination

Pulsed beam STEM Illumination*

Pulsed beam STEM illumination

Dose attenuation by pulsed illumination with Frequency of 500 kHz (2 μs) in a high resolution STEM at 300 kV using Si[110] in the condition of pixel dwell time with 19 μs/pixel (1,024 x 1,024 pixels), by changing duration ration from 90% to 50% during acquisition of one STEM image in 20 s.

* Electrostatic Dose Modulator (EDM) offers two versions, EDM Basic and EDM Advanced. EDM Basic provides Pulsed Beam TEM Illumination, and EDM Advanced does both Pulsed Beam TEM Illumination and Pulsed Beam STEM Illumination.


Fast beam blanking

Accelerating voltage 300 kV 200 kV 80 kV
Maximum pulse frequency 500 kHz 750 kHz 1 MHz 
Transition time <50 ns
Minimum pulse width 100 ns
Blanking signal inputs 3 inputs

Dose attenuation

Configuration EDM Basic EDM Advanced
Application TEM imaging TEM and STEM imaging, pump-probe dynamics
Pulse repetition frequency (Maximum) 62.5 kHz 500 kHz @300 keV, 1 MHz @200 keV
Pulse repetition period (Mimimum) 16 μs 2 μs
Pulse duration (Fastest)  125 ns 100 ns

Applicable model: JEM-ARM300F2, JEM-ARM200F (CFEG), NEO ARM (CFEG), JEM-F200 (CFEG)


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Installation Examples