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.
Estimated parameters
| 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 |