Speaker
Asato Orii
(urn:Facebook)
Description
Super-Kamiokande (SK), a 50-kiloton water Cherenkov detector, is one of
the most sensitive neutrino detectors. SK is continuously collecting
data as the neutrino observatory and can be used also for supernova
observations by detecting supernova burst neutrinos.
It is reported that Betelgeuse (640ly) is shrinking 15% in 15 years
(C.H.townes et al. 2009) and this may be an indication of the supernova
burst. Based on the Livermore model, the simulation study predicts
30MHz neutrino events observed in the SK detector for the neutrino
burst from a supernova within a few hundreds of light years.
The current SK data acquisition (DAQ) system can record only about
first 20% of the events. To overcome this inefficiency, we developed
a new DAQ system that records the number of hit PMTs so that we can
store high-rate events and obtain a time profile of the number of
neutrinos emitted at the supernova.
This system uses the outputs from the number of hits from existing
electronics modules as inputs and it is synchronized to the existing
DAQ system. Therefore the data is easily checked the correlation to
that from the existing electronics. The data is transferred to the
computers with SiTCP, an implementation of TCP/IP stack in FPGA without
CPU. Part of the data are stored in the 4GB DDR2 memory before it
transferred and this makes it possible to record detailed time structure
of the superonva signal. The design and the production of the new
modules were completed and we tested basic functions and the interference
with the existing system. The firmware for the module is prepared
and now being installed in SK. We will report the development and
the status of the operation.
Primary author
Asato Orii
(urn:Facebook)
Co-authors
Masahiro Ikeno
(High Energy Accelerator Research Organization (KEK))
Tomonobu Tomura
(ICRR. University of Tokyo)
Yoshihisa Obayashi
(Department of Physics)
Yoshinari Hayato
(University of Tokyo)
