ISSN:
1600-5775
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
A low-energy positron beam is a unique probe of Fermi surfaces, defects, surfaces and interfaces. In high-energy electron and positron storage rings (E 〉 6 GeV) it is possible to generate intense synchrotron radiation with 1–3 MeV photons by installing a high-field superconducting wiggler. The strength of the wiggler should be 8̃–12 T. High-energy photons are emitted from the wiggler and converted to low-energy positrons by using a suitable target-moderator system. For an 8 GeV electron storage ring at a beam current of 100 mA, final yields are estimated to be 1̃010–1012 (slow-e+ s−1) with the size of positron source 1̃02-103 cm2. The possibility of increasing the brightness of the low-energy positron beam is discussed. Advantages of using synchrotron radiation for producing positrons are pointed out. The effect of a superconducting wiggler on the stored electron beam is also discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S090904959600605X
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