LHCb VELO UpgradeMedipix/Timepix PR01 Testbeam

6 pixel telescope planes angled in 2 dimensions to optimise resolution

Device Under Testmoved and rotated via

remote controlled stepper motor

PR01 Fine pitch strip detectorwith fast electronics readout (Beetle)

150 um thin sensorClustersizes as a function of angle

angle (degrees)

clus

ter

size

bending plane

non bending plane

Cluster TOT valuesthin sensor

telescope planes

Resolution – thin sensor perpendicular

Telescope planes ~ 4 um as expected

Thin sensor ~15 um

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 optimumangle of 9 degrees

Note that there is a contribution of about 2.2 um fromthe telescope