Journal article

The new beampipe for the Belle experiment

R Abe, T Abe, H Aihara, Y Asano, T Aso, A Bakich, T Browder, MC Chang, Y Chao, KF Chen, S Chidzik, J Dalseno, R Dowd, J Dragic, CW Everton, R Fernholz, M Friedl, H Fujii, ZW Gao, A Gordon Show all

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | ELSEVIER SCIENCE BV | Published : 2004

Abstract

We have upgraded the beampipe and the silicon vertex tracker of the Belle detector for increased luminosity and to achieve better vertex resolution. The radius of the beampipe was reduced from 2 to 1.5cm to achieve better vertex resolution. In order to reduce the beam background that could accompany the reduction of the beampipe radius, a massive mask made of tantalum and tungsten was placed on each side of the central section. The total weight of them is 40 kg. The maximum radiation dose of the silicon tracker is measured about 80 krad/yr. This is lower than the dose of 100krad per year with the previous beampipe even though the beampipe radius is smaller. The beampipe is designed to minimi..

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