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Progress towards an intense beam of positrons created by a Van de Graaff accelerator.
- Source :
-
Nuclear Instruments & Methods in Physics Research Section B . Dec2017, Vol. 412, p71-80. 10p. - Publication Year :
- 2017
-
Abstract
- A 4MV Van de Graaff accelerator was used to induce the nuclear reaction 12 C(d,n) 13 N in order to produce an intense beam of positrons. The graphite target was heated so the radioactive 13 N would desorb from the bulk into the vacuum. This radioactive gas is frozen onto a cryogenic freezer where it decays to produce an antiparticle beam of positrons. This high current beam is then guided into a superconducting magnet with field strength up to 7 Tesla where the positrons will be stored in a newly designed Micro-Penning-Malmberg trap. Several source geometries have been experimented on and found a maximum antimatter beam with a positron flux of greater than 0.55 ± 0.03 × 10 6 e + s −1 was achieved. This beam was produced using a solid rare gas moderator composed of krypton (Kr) at a temperature of 25 ± 5 K. Due to geometric restrictions on this set up and other loss mechanisms, 10 7 –10 8 e + s −1 of the total number of positrons are lost. Simulations and preliminary experiments suggest a new geometry, currently under testing, will produce a beam of 10 7 e + s −1 or more. The setup and preliminary results for the new geometry will be discussed as well. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0168583X
- Volume :
- 412
- Database :
- Academic Search Index
- Journal :
- Nuclear Instruments & Methods in Physics Research Section B
- Publication Type :
- Academic Journal
- Accession number :
- 125968731
- Full Text :
- https://doi.org/10.1016/j.nimb.2017.09.005