Speaker
Prof.
Ryosuke ITOH
(KEK)
Description
The Belle experiment, which is a B-factory experiment at KEK in Japan, is currently
taking data with a DAQ system based on FASTBUS readout, switchless event building and
higher level trigger(HLT) farm. To cope with a higher trigger rate from the expected
sizeable increase in the accelerator luminosity in coming years, the upgrade of the
DAQ system is in progress. FASTBUS modules are being replaced with newly-developed
pipelined readout modules equipped with Linux-operated CPUs, and additional units of
the modularized event builder and HLT farm are beingadded. We developed a unified
software framework for the upgraded DAQ system which can be used at all levels from
the readout modules to the HLT farms. The software is modularized and consists of
following components: a common data processing framework compatible with the offline
analysis, point-to-point data transmitter and receiver programs over TCP connections,
a ring buffer, an event building module, and a slow control framework. The advantage
to have a unified framework is that a software module developed in offline can be
directly executed at any levels of DAQ, even at the readout module. This makes the
development of the DAQ software much easier. The experience with the unified
framework in the partially-upgraded Belle DAQ system is presented.
Primary author
Prof.
Ryosuke ITOH
(KEK)
