| タイトル | Performance characteristics of high-conductivity channel electron multipliers |
| 著者（英） | Timothy, J. G.; Bybee, R. L. |
| 著者所属（英） | Ball Bros. Research Corp.|Harvard-Smithsonian Center for Astrophysics |
| 発行日 | 1978-08-01 |
| 言語 | eng |
| 内容記述 | The paper describes a new type of continuous channel multiplier (CEM) fabricated from a low-resistance glass to produce a high-conductivity channel section and thereby obtain a high count-rate capability. The flat-cone cathode configuration of the CEM is specifically designed for the detection of astigmatic exit images from grazing-incidence spectrometers at the optimum angle of illumination for high detection efficiencies at XUV wavelengths. Typical operating voltages are in the range of 2500-2900 V with stable counting plateau slopes in the range 3-6% per 100-V increment. The modal gain at 2800 V was typically in the range (50-80) million. The modal gain falls off at count rates in excess of about 20,000 per sec. The detection efficiency remains essentially constant to count rates in excess of 2 million per sec. Higher detection efficiencies (better than 20%) are obtained by coating the CEM with MgF2. In life tests of coated CEMs, no measurable change in detection efficiency was measured to a total accumulated signal of 2 times 10 to the 11th power counts. |
| NASA分類 | INSTRUMENTATION AND PHOTOGRAPHY |
| レポートNO | 78A45467 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/431727 |
