Comparison of radiation shielding of the first optics enclosures between bending magnet and insertion device beamlines at the Canadian Light Source

Interaction of electrons with residual molecules in the vacuum chamber of the storage ring produces gas bremsstrahlung. Shielding against gas bremsstrahlung for the First Optics Enclosure (FOE) of the bending magnet (BM) beamline is studied in relation to that of the insertion device (ID) beamline. Owing to the considerable difference in the length of the straight section of the storage ring between the two types of beamlines, a significant reduction in shielding material may be realized for the FOE of the BM beamline.