Speaker
Herve Chanal
(Univ. Blaise Pascal Clermont-Fe. II (FR))
Description
The LHCb detector will be upgraded during the next LHC shutdown in 2018/19. The tracker system will have a major overhaul.
Its components will be replaced with new technologies in order to cope with the increased hit occupancy and radiation
environment. A detector made of scintillating fibres read out by silicon photomultipliers (SiPM) is studied for this
upgrade. Even if this technology has proven to achieve high efficiency and spatial resolution, its integration within a LHC
experiment bears new challenges. This detector will consist of 12 planes of 5 to 6 layers of 250μm fibres with an area of
$5\times 6$ m$^2$. Its lead to a total of 500k SiPM channels which need to will be read out at 40MHz.
This talk gives an overview of the R&D status of the readout board and the PACIFIC chip. The readout board is connected to
the SiPM on one side and to the experiment data-acquisition, experimental control system and services on the otherside .
The PACIFIC chip is a 128 channel ASIC which can be connected to one 128-channel SiPM without the need for any external
component. It includes the analog signal processing and a 2 bits non-linear flash ADC for digitisation. The PACIFIC chip
design highlights a very fast shaping (~10ns) and the ability to cope with different SiPM suppliers with a power consumption
below 8mW per channel.
Primary author
Herve Chanal
(Univ. Blaise Pascal Clermont-Fe. II (FR))
Co-authors
Fred Blanc
(Ecole Polytechnique Federale de Lausanne (CH))
Nicolas Geoffroy Pillet
(Univ. Blaise Pascal Clermont-Fe. II (FR))
