The Multigap RPC is a high precision timing and tracking detector with
an active area of 25.6cm x 18.2cm and readout with 24 strips.
Charged particles ionise gas in gaps between glass plates in a stack. A
large electric field causes small avalanches of ionisation in each gap.
The moving charges are picked up on readout strips and the timing of the
charge deposition is to be read out on each side of each strip. The
differential timing of the ionisation reveals the position along the
strip and the precise arrival time of the particle. Multiple MRPCs can
be used to measure particle time of flight (ToF).