1. C.Gustavino, may 19-23, 2003 1 The Trigger walls of the test facility @ LNGS The gas system of the trigger wall is ready only since the last week (delay due to the safety panic after the Borexino accident ). First preliminary measurements (last Friday) looks OK: Low counting rates Low currents Many minor problems to be fixed - at least one month of debug (instead of the three foreseen, see the ATC talk in Naples, december 2002).

2. C.Gustavino, may 19-23, 2003 2TW@Lab2 Each wall is 4 m high, 5 m long. 128 Glass RPCs, 256 digital channels, 64 TDC

3. C.Gustavino, may 19-23, 2003 3 Trigger wall Glass RPC

4. C.Gustavino, may 19-23, 2003 4 Wall FEE electronics The Y (vertical) coordinate is mesured by using the (modified) MACRO digitalcards. The X coordinate is determined by mesuring the time Difference between the pulses propagating along the Flat cable strips. The spatial resolution is ~1 cm in both the coordinates.

5. C.Gustavino, may 19-23, 2003 5 Pulse from a wall string Argon + Isobutane + TFE + SF6=47+4+48+1 % Single count rate of Few glass RPC Just switched on

6. C.Gustavino, may 19-23, 2003 6 Conclusion Gas System ready just now Full debug needs at least 1 month Bachelite RPC debug can start soon With a hibrid trigger system (DAQ system final test) RPC+magnet mounting foreseen for august (see Mario’s talk)