Abstract
The construction and first operation of the slow positron beam built at the Hebrew University is reported here. The beam follows a traditional design, using a
22Na source, a Tungsten moderator, and a target cell equipped with a load-lock
system for easy sample insertion. The beam energy varies between 0
.03 keV and
30 keV. The detection system consists of two high purity Germanium detectors,
facing each other, allowing low-background Doppler-Broadening (DB) measurements. Event readout is done using a state-of-the-art compact desktop system.
The target cell is designed to allow a combined measurement of DB and sample
conductivity, with the flexibility to add more detection options in the future.
The beam has been successfully tested by using it to charecterize Titanium (Ti)
films. Two 1.2
µm Ti films - as produced, and after annealing, were measured
at various energies (2 keV - 25 keV), and the results show consistent behavior
with previous measurements.
22Na source, a Tungsten moderator, and a target cell equipped with a load-lock
system for easy sample insertion. The beam energy varies between 0
.03 keV and
30 keV. The detection system consists of two high purity Germanium detectors,
facing each other, allowing low-background Doppler-Broadening (DB) measurements. Event readout is done using a state-of-the-art compact desktop system.
The target cell is designed to allow a combined measurement of DB and sample
conductivity, with the flexibility to add more detection options in the future.
The beam has been successfully tested by using it to charecterize Titanium (Ti)
films. Two 1.2
µm Ti films - as produced, and after annealing, were measured
at various energies (2 keV - 25 keV), and the results show consistent behavior
with previous measurements.
| Original language | American English |
|---|---|
| Publisher | arXiv |
| Number of pages | 17 |
| Volume | 2007.05921 |
| State | Published - 2020 |