13th Vienna Conference on Instrumentation - VCI2013

The CHarged ANTIcounter for the NA62 experiment at CERN

Not scheduled

50m

Vienna University of Technology

Board: 3

Poster Scintillating Detectors

Speaker

Fabio Ambrosino (Università degli Studi di Napoli "Federico II" e Sezione INFN Napoli)

Description

The CHANTI is a charged hodoscope with many innovative features in order to cope with the needs of the NA62 experiment at CERN. Its main aim is to veto the inelastic interaction of the NA62 beam with the Si beam spectrometer called Gigatracker (GTK). Although a fraction of less than 10-3 of the beam particles will suffer an inelastic interaction with the GTK, the huge flux of K crossing the GTK (about 8*10^13 in two years of data taking) and the low rate of the signal K+->pi+ nu nubar (8*10^-11 according to Standard Model predictions) makes these events a potentially harmful background if not vetoed. CHANTI is a series of six guard rings, to be operated in vacuum, and covering a wide angular region downstream the last GTK station. Its main features are: time resolution <1 ns, crack-free design and high light yield in order to maximize efficiency for charged particles, xy position determination, low outgassing and low power dissipation in vacuum, capability to sustain relatively high rates. This has been achieved by using triangularly shaped scintillator bars coupled with fast wavelength shifting fibers, each read via a Silicon Photomultiplier (SiPM). All of the bars have been assembled and tested during 2012 and the first of the six stations has been assembled in July 2012 and tested using the prototype of a dedicated front-end board providing fast amplification of the signal, fine bias voltage setting and both current and temperature monitoring for each channel.