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FlyoDoc_2011 Pisa 2011 by GmP --- 011
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FlyoDoc_2011 Pisa 2011 by GmP --- 011
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#include <devchanti.h>
Public Member Functions | |
| virtual int | SimulaDev () |
NA62 device The Charged ANTI (CHANTI) detector is required in order to reduce critical background induced by inelastic interactions of the beam with the collimator and the Gigatracker (GTK) stations as well as to tag beam halo muons in the region immediately close to the beam. The most critical events are the ones in which the inelastic interaction takes place in the last GTK station (GTK-3). In such cases, pions or other particles produced in the interaction, if emitted at low angle, can reach the straw tracker and mimic a K decay in the fiducial region. If no other track is detected, these events can appear like a signal event, i.e. one single π+ in the final state. A GEANT4 simulation has shown that kaon inelastic interactions with GTK-3 happens in about 1/103 cases, so that the combined rejection factors of the analysis cuts and the CHANTI veto must lead to a remaining inefficiency of 10-8.
It is composed of six stations, placed inside the vacuum tube respectively at 27-77-177-377-777-1577 mm distance from the GTK-3 The rectangular hole inside each station is 50 mm in y and 90 mm in X due to the rectangular shape of the beam. Outer square side length is 300 mm. For particles hitting the GTK-3 center the CHANTI covers hermetically the angular region between 34 mrad and 1.38 rad wrt the beam axis, for particles hitting one of the GTK-3 corners the coverage is hermetic between 50 mrad and 1.16 rad.
See CHANTI Detector Requirements publication
Definition at line 37 of file devchanti.h.
