Computing for Belle
Katayama, N · CERN Document Server (European Organization for Nuclear Research) · 2005
The Belle experiment operates at the KEKB accelerator, a high luminosity asymmetric energy e + e -machine.KEKB has achieved the world highest luminosity of 1.39 times 10 34 cm -2 s -1 .Belle accumulates more than one million B meson anti-B meson pairs in one good day.This corresponds to about 1TB of raw data per day.The amount of the raw and processed data accumulated so far exceeds 1.2PB.Belle's computing model has been a traditional one and very successful so far.The computing has been managed by minimal number of people using cost effective solutions.Looking at the future, KEKB /Belle plans to improve the luminosity to a few times 10 35 cm -2 s -1 , 10-24 times as much as we obtain now.This paper describes Belle's efficient computing operations, struggle to manage large amount of raw and physics data, and plans of Belle computing for Super KEKB/Belle. STATUS OF BELLE EXPERIMENTBelle started taking data in 1999 and has nearly been doubling its data size every year.Figure 1 shows the history of its accumulated integrated luminosity.