X. Workshop on Resistive Plate Chambers and Related Detectors

In this work we present results concerning the ground-level cosmic ray test, prior to the final installation and commissioning of the new Resistive Plate Chamber (RPC) Time of Flight (TOF) wall for the High-Acceptance DiElectron Spectrometer (HADES) spectrometer at GSI [1]. The TOF wall is composed of six equal sectors, each one constituted by 187 individual 4-gaps glass-aluminum shielded RPC cells distributed in three columns and two partially overlapping layers, covering an area of 1.26 m2. All sectors were tested with the final FEE and DAQ described in [2], [3]. Results confirm a very uniform time response below 85 ps sigma, crosstalk on the few % level and moderate timing tails along with an average longitudinal position resolution better than 10 mm sigma. [1] D. Belver, et al., The HADES RPC inner TOF Wall, NIMA Vol 602, Issue 3, 1 May 2009, 687-690. [2] D. Belver, et al., Performances of the front-end for the HADES RPC TOF wall on a C12 beam, NIMA Vol 602, Issue 3, 1 May 2009, 691-695. [3] A. Gil et al., Journal of instrumentation 2007 JINST 2 T11001, (2007)