Speaker
Mr
Eric Delagnes
(CEA/Irfu)
Description
The T2K (Tokai-to-Kamioka) experiment is a long baseline neutrino oscillation experiment in Japan, for which a near detector complex (ND280), used to characterize the beam, will be built 280m from the target in the off-axis direction of the neutrino beam produced using the 50 GeV proton synchrotron of J-PARC (Japan Proton Accelerator Research Complex). The central part of the ND280 is a detector including 3 large Time Projection Chambers based on Micromegas gas amplification technology with anodes pixelated into about 125,000 pads and requiring therefore compact and low power readout electronics. A 72-channel front-end Application Specific Integrated Circuit has been developed to read these TPCs. Each channel includes a low noise charge preamplifier, a pole zero compensation stage, a second order Sallen-Key low pass filter and a 511-cell Switched Capacitor Array. This electronics offers a large flexibility in sampling frequency (50 MHz max.), shaping time (16 values from 100 ns to 2 µs), gain (4 ranges from 120 fC to 600 fC), while taking advantage of the low physics events rate of 0.3 Hz. 6000 AFTER ASICs, have been manufactured in 2008 using a low-cost 0.35 μm CMOS technology,. They are currently being integrated on the TPCs for a start of commissioning at the end of the year 2009 in Japan.
Primary author
Mr
Eric Delagnes
(CEA/Irfu)
Co-authors
Mr
Alain Le Coguie
(CEA/Irfu)
Dr
Denis Calvet
(CEA/Irfu)
Ms
Estelle Montmarthe
(CEA/Irfu)
Mr
Frederic Druillole
(CEA/Irfu)
Mr
Pascal Baron
(CEA/Irfu)
Dr
Xavier De la Broise
(CEA/Irfu)
