Speaker
Description
Detectors based on Chemical Vapor Deposition (CVD) diamond have been used
extensively and successfully in beam conditions/beam loss monitors as the
innermost detectors in the highest radiation areas of Large Hadron Collider
(LHC) experiments. Over the last two years the RD42 collaboration has
constructed a series of 3D pixel detectors using CVD diamond as the active
material with laser fabricated columns in the bulk and characterized them
in test beams. The electrical properties and latest beam test results from
2017 and 2018 of the efficiency and spatial resolution of the most recent
3D pixel detectors constructed with poly-crystalline CVD diamond will be
presented. The devices were constructed with 50 $\mu$m $\times$ 50 $\mu$m
cells with columns 2.6 $\mu$m in diameter. In one of the devices the cells
were ganged using a surface metalization layer in a 5 $\times$ 1 cell
pattern to match the geometry of the ATLAS FE-I4 pixel readout electronics
and in the other the cells were ganged using a surface metalization
layer in a 3 $\times$ 2 cell pattern to match the geometry of the CMS
PSI46digV2.1-respin pixel readout electronics. In beam tests, using tracks
reconstructed with a high precision tracking telescope, both devices
achieved tracking efficiencies greater than 97\%. In the same beam tests,
the first pulse height distributions from poly-crystalline CVD
diamond 3D pixel devices were measured. Finally, the latest test beam
results of irradiated poly-crystalline CVD diamond pad and pixel detectors
will be presented.
