Power deposition in the vacuum chambers of the MQW magnets of IR3 and IR7

Motivated by several changes made to the collimation system, we calculated the power deposited in the vacuum chambers of the MQW modules of IR3 with graphite collimator jaws for the former V6.2 version. Using the minimum lifetime recently specified for the nominal stored intensity, we conclude that the power deposition in the vacuum chamber of some MQW modules is too large in the presence of bake-out system. Either a cooling system must be envisaged or the specification of the minimum lifetime must be raised from one to three hours. These results might have to be evaluated again if the final insertion differs substantially from the one used in the present simulation.