Speaker
Dr
Paolo Baesso
(University of Bristol)
Description
Resistive Plate Chambers are widely used in high energy physics
experiments as reliable trigger systems due to their excellent
time resolution and rate capability, while generally the track
spatial information is obtained by means of different
detectors. Studies show that it is possible to produce RPC with
good spatial resolution (~ 0.5 mm) by appropriate choice of the
pitch of the readout strips. High resolution RPC (HRPC) can be
economically produced to cover large area and represent a valid
alternative to more expensive detectors in applications when a
spatial resolution of 0.5 mm is sufficient. Our group has
successfully produced a Muon Scattering Tomography (MST) prototype
based on 12 HRPCs which provide 3D information on muons
scattering in a volume ~ 50 cm x 50 cm x 80 cm (suitable for
scanning a suitcase). Both the incoming and the outgoing tracks
of the muon are reconstructed. The required spatial granularity
is achieved using ~300 readout strips per HRPC, with a pitch of
1.5 mm. All the strips from an HRPC are multiplexed into a
single differential analog line by four Helix 3.0 chips daisy
chained on a hybrid circuit. The detector has been collecting
data since June 2011, with the HRPC showing an efficiency above
99% and purity above 98%. The spatial resolution on the tracks
is ~0.8 mm. This is a preliminary measurement and includes the
intrinsic detector resolution as well as the extrapolation
errors due to multiple scattering in the detectors and
separation of the planes. Additional results will be presented.
Primary author
Dr
Paolo Baesso
(University of Bristol)
Co-authors
Chris Steer
(Atomic Weapon Estabilishment)
Dr
David Cussans
(University of Bristol)
Dr
Jaap Velthuis
(University of Bristol)
Josh Davies
(University of Bristol)
Stacey Robertson
(Atomic Weapon Estabilishment)
Steve Quillin
(Atomic Weapon Estabilishment)
