کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5365382 | 1388330 | 2008 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Construction and timing system of the EPOS beam system Construction and timing system of the EPOS beam system](/preview/png/5365382.png)
The Forschungszentrum Dresden-Rossendorf provides an intense pulsed 40Â MeV electron beam with high brilliance and low emittance (ELBE). The pulse has a length of 1-10Â ps and a repetition time of 77Â ns, or in slow mode 616Â ns. The EPOS system (ELBE Positron Source) generates by pair production on a tungsten converter and a tungsten moderator an intense pulsed beam of mono-energetic positrons. To transport the positrons to the laboratory (12Â m) we constructed a magnetic beam guidance system with a longitudinal magnetic field of 75Â G. In the laboratory outside the cave, the positron beam is chopped and bunched according to the time structure, because the very sharp bunch structure of the electron pulses is broadened for the positron beam due to transport and moderation.
Journal: Applied Surface Science - Volume 255, Issue 1, 31 October 2008, Pages 42-45