9.3 Shielding-Design Calculation of SR Beam Lines with Simple and Precise Procedures

Fig. 9-7

The calculation flow-chart of STAC8

Red letters show new points for consideration.


magnified picture
Fig. 9-8

Concept of shielding calculation with STAC8 code for SR beam lines

By the STAC8 code, light spectrum and dose can be calculated consistently at arbitrary points on the side wall, roof and back wall, taking into account the angular dependent scattering and polarization effect of photons.

Fig. 9-9

Examples of dose calculation on the roof shielding hatch of the BL47XU of SPring-8

The scattering effects of polarization, effective wall width and buildup factor are involved.

The large synchrotron radiation (SR) facility, SPring-8, stores a high energy 8 GeV electron beam and, radiates a high brilliance and high intensity SR beam including components of higher energy than previously existed. Therefore, the shielding design should be calculated for the severe conditions which have not had to be applied to existing facilities. A shielding-design code (STAC8) was developed to shield the SR beam efficiently. This code is exclusively for SR beam shielding calculations and has various features: the code makes it possible to deal with the scattering of the linearly polarized photon beam which has never been calculated. It can estimate consistently the SR spectrum and the dose leaking from the shielding hatch. As good performances of both benchmark tests and practical tests were obtained, not only the researchers of SPring-8 but also those of foreign SR facilities have a great interest in it.

Reference
Y. Asano, Shielding Design Calculation of SPring-8 Beamline Using STAC8, J. Synchrotron Rad., 5, 1 (1998).

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Persistent Quest-Research Activities 1998
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