2,009 research outputs found
Diamond thin Film Detectors for Beam Monitoring Devices
Diamonds offer radiation hard sensors, which can be used directly in primary
beams. Here we report on the use of a polycrystalline CVD diamond strip sensor
as beam monitor of heavy ion beams with up to 2.10^9 lead ions per bunch. The
strips allow for a determination of the transverse beam profile to a fraction
of the pitch of the strips, while the timing information yields the
longitudinal bunch length with a resolution of the order of a few mm.Comment: 6 pages, 7 figures, to appear in the Proceedings of the Hasselt
Diamond Workshop (Hasselt, Belgium, Feb. 2006), v4: accidentally submitted
figure, appearing at end, remove
Lorentz angle measurements in irradiated silicon detectors between 77 K and 300 K
Future experiments are using silicon detectors in a high radiation
environment and in high magnetic fields. The radiation tolerance of silicon
improves by cooling it to temperatures below 180 K. At low temperatures the
mobility increases, which leads to larger deflections of the charge carriers by
the Lorentz force. A good knowledge of the Lorentz angle is needed for design
and operation of silicon detectors. We present measurements of the Lorentz
angle between 77 K and 300 K before and after irradiation with a primary beam
of 21 MeV protons.Comment: 13 pages, 9 figures, submitted to ICHEP2000, Osaka, Japa
Medium Energy Ion Scattering of Gr on SiC(0001) and Si(100)
Depth profiling of graphene with high-resolution ion beam analysis is a
practical method for analysis of monolayer thicknesses of graphene. Not only is
the energy resolution sufficient to resolve graphene from underlying SiC, but
by use of isotope labeling it is possible to tag graphene generated from
reacted ethylene. Furthermore, we are able to analyze graphene supported by
oxidized Si(100) substrates, allowing the study of graphene films grown by
chemical vapor deposition on metal and transfered to silicon. This introduces a
powerful method to explore the fundamentals of graphene formation
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