P Cabanelas Hades Telescope
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Transcript of P Cabanelas Hades Telescope
Proyecto
2nd Workshop, Compostela, February 2010
The HADES RPC Cosmic Ray Telescope:Preliminary Analysis
Pablo Cabanelas
Laboratorio Carmen Fernández, USC
OUTLINE:
● Overview of the HADES RPC ToF Wall
● The Cosmic Ray Commissioning
● Close to the first TRASGO
● Preliminary Analysis Results
The HADES RPC ToF Wall
Consist on 1122 shielded 4-gap timing RPC cells (0.280mm/gap), covering about 8m2, distributed like this:
● 6 almost-identical sectors
● 2 RPC layers per sector
● 3 columns of RPC cells per layer
● 31 RPC cells per column
The RPC Commissioning
From April 2009 to nowadays
1. The 6 sectors were instrumented by pairs at the
GSI and placed at horizontal position.
2. Cosmic Ray test was performed with such a
setup.
3. At the end, they were mounted on their nominal
position in HADES.
4. Currently, they are just there, a bit bored,
waiting for a beam to take data.
Cosmic ray commissioning summary:
● 6 RPC sectors fully instrumented, tested,
validated and mounted in HADES
● About 50 days of data taken at a rate of 200
Hz over a pair of sectors
● 895 Gb of data stored
● 1122 RPC cells operative as well as 2243
channels (all but one!)
A Tracking Algorithm forTRASGOS
timtrack
timtrack
timtrack
timtrack
timtrack
timtrack
timtrack
timtrack
timtrack
timtrack
timtrack
timtrack
Proyecto
Already introducedTo be presented by
J.Garzón
Preliminary Cosmic Ray Analysis with TimTrack
33cm
Preliminary Cosmic Ray Analysis with TimTrack
Analyzed events crossing one set of four RPC cells
~42cm~5cm
Ref Plane
ZX
Preliminary Cosmic Ray Analysis with TimTrack
Some Ultra-Preliminary Results!!!
Reconstructed X at the reference plane
Reconstructed X vs X' (slope): acceptance
Preliminary Cosmic Ray Analysis with TimTrack
Some Ultra-Preliminary Results!!!
Reconstructed T0 (Time at the reference
plane) in ps [Not calibrated]
Two-Peak structure
~6-8 ns
Close to the first TRASGO ??
TRASGO:
Several planes (4 at least) of ?-gap RPC strips
2 HADES RPC sectors:
Four planes of shielded 4-gap RPCs
Different Geometry -- Same FEE, DAQ and Analysis