At present the main requirements for the development of advanced channel SEMs are the following: extended dynamic range, increased lifetime and compactness of the detector.
The above requirements are achieved by using a helical design, which consists of six single channels that are twisted around a solid center. This results in effective six-fold increase of output surface area, which provides dynamic range extension and increased lifetime. Moreover, this design enables a compact, sophisticated detector with good heat dissipation and without the need for enclosure.
Expected development time: 2024.
|Operating voltage, V||1200-3000|
|Gain||5 x107 ÷ 1 x108, at 3000 V|
|Dark current, A||< 1 x10-12, at 3000 V|
|Dark count rate, count/sec||< 2, at 3000 V|
|Resistance||15 – 40 MΩ, at room temperature|
|Channel strip current, μA||75÷200, at 3000 V|
|Average output current, μA||<10% of channel strip current|
|Operating temperature range, °С||-50 to +100|
|Maximum vacuum heating temperature, °C||350|
|Vacuum, mm Hg||1×10-5|