Abstract: A cryopump includes a refrigerator with at least first and second stages. A radiation shield surrounds the second stage and is in thermal contact with the first stage. The radiation shield includes a drain hole to permit cryogenic fluid to traverse through the drain hole during regeneration. The cryopump also includes a primary pumping surface supporting adsorbent in thermal contact with the second stage. The second stage array assembly includes a primary condensing surface, protected surfaces having adsorbent, and non-primary condensing surfaces. A baffle is disposed over the drain hole. The baffle redirects gas from an annular space disposed between the radiation shield and the vacuum vessel that attempts to traverse through the drain hole to prevent the gas from condensing on a non-primary condensing surface. The baffle directs gas to condense on the primary condensing surface.

Abstract: A cryopump includes a refrigerator with at least first and second stages. A radiation shield surrounds the second stage and is in thermal contact with the first stage. The radiation shield includes a drain hole to permit cryogenic fluid to traverse through the drain hole during regeneration. The cryopump also includes a primary pumping surface supporting adsorbent in thermal contact with the second stage. The second stage array assembly includes a primary condensing surface, protected surfaces having adsorbent, and non-primary condensing surfaces. A baffle is disposed over the drain hole. The baffle redirects gas from an annular space disposed between the radiation shield and the vacuum vessel that attempts to traverse through the drain hole to prevent the gas from condensing on a non-primary condensing surface. The baffle directs gas to condense on the primary condensing surface.

Abstract: A method of invalidating cache lines on an SCI sharing list by forwarding an invalidate request from node to node of a multiprocessor computer, such as a distributed shared memory (DSM) or non-uniform memory access (NUMA) machine. From the node at the head of the list, an invalidate request is sent to a succeeding node on the list. In response to receiving the invalidate request, the succeeding node checks the state of its cache line to determine whether it is the tail of the list and also invalidates the cache line. If the succeeding node is not the tail of the list, it forwards the invalidate request to the next succeeding node on the list. This next succeeding and other succeeding nodes then repeat the steps of invalidating the cache line and forwarding the invalidate request until the node that is the tail of the list is reached. The tail node responds by sending an invalidate response to the node at the head of the sharing list.

Abstract: An interconnector 22 for filtration modules 18 which have axially extending tubes 90. The interconnector 22 is a rigid tubular member having conical tapered portion 88 at opposite ends to join fluid tight connections with the filtration modules.