| Автор | D W O Heddle |
| Автор | N Papadovassilakis |
| Дата выпуска | 1984-07-01 |
| dc.description | The authors have made an experimental study of a five-element afocal lens and find that the magnification, M, depends on the overall voltage ratio, V<sub>5</sub>/V<sub>1</sub>, in exactly the manner predicted earlier, i.e. M=(V<sub>5</sub>/V<sub>1</sub>)<sup>-1</sup>4/. For lenses of different proportions they find that the prediction of a simple scaling law for the focusing potentials is valid. They have extended their measurements to five-element lenses with potential distributions different from those used in the afocal lens and have demonstrated 'true zoom' action in which the magnification can be varied over a range of some 9:1 at a given overall voltage ratio. Measurements made over a wide range of focusing potentials show that the five-element lens could be operated to give constant magnification over an extremely wide range (10<sup>4</sup>:1) of overall voltage ratio or to give constant angular magnification over a smaller, but still substantial range (100:1). The authors present design curves from which the potential distribution required for a specific purpose can be simply obtained. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | The magnification behaviour of a five-element electrostatic lens |
| Тип | paper |
| DOI | 10.1088/0022-3735/17/7/015 |
| Print ISSN | 0022-3735 |
| Журнал | Journal of Physics E: Scientific Instruments |
| Том | 17 |
| Первая страница | 599 |
| Последняя страница | 605 |
| Аффилиация | D W O Heddle; Dept. of Phys., Royal Holloway Coll., Egham, UK |
| Аффилиация | N Papadovassilakis; Dept. of Phys., Royal Holloway Coll., Egham, UK |
| Выпуск | 7 |
