The MASSIF beam line has been designed with two optical hutches : OH1 and OH2, with OH2 housing all optical components except primary slits and white beam attenuators.
While OH1 also contains equipment for ID30B/MAD, the beam for the second branch of ID30 (ID30B) crosses OH2 in a lead shielded tube. This setup allows maintenance on ID30B/MAD while the MASSIF beam is not affected thus leaving a working beam line.