1. LHCb VELO Upgrade Medipix/Timepix PR01 Testbeam
6 pixel telescope planes angled in 2 dimensions to optimise resolution
PR01 Fine pitch strip detector
with fast electronics readout (Beetle)
Device Under Test
moved and rotated via
remote controlled stepper motor

2. 150 um thin sensor Clustersizes as a function of angle
bending plane
non bending plane
angle (degrees)

3. Cluster TOT values
thin sensor
telescope planes

4. Resolution – thin sensor perpendicular
Telescope planes ~ 4 um as expected
Thin sensor ~15 um

5. Resolution: 20 degree angle
Thin sensor ~7.5 um
(possibility of small improvement with alignment)
This number was ~5.2 um for thick sensor, at optimum
angle of 9 degrees
Note that there is a contribution of about 2.2 um from
the telescope