Quality assurance plan for Atlas raw steel sheets

摘要

As part of a collaborative experimental High Energy Physics experiment at the LHC Facility, CERN Laboratory, Geneva, Switzerland, a group of US institutions has accepted the responsibility for constructing a large portion of the calorimeter for this experiment. This device is referred to as the Tile Calorimeter. The Tile Calorimeter has three major elements, a large center section (Barrel), and two end sections (Extended Barrel). The US group will be responsible for the construction of one of these extended barrel sections. All of the components that are required to construct this device will be fabricated in the US over a period of three years commencing in 1998. Another similar element and the barrel element will be constructed in both eastern and western Europe by parallel groups. The extended barrel is a cylindrical device approximately 8.5 meters (28 ft.) OD x 4.5 meters (14 ft.) ID, made up of 64 wedges. Each of these wedges is constructed by bolting submodules to a strongback girder. Each submodule is constructed of a series of sheets that are welded and glued together. The purpose of this Quality Assurance document is to insure that the raw steel sheet meets the magnetic, strength, and stamping requirements for the Atlas tile Calorimeter. In order to meet these requirements, a set of specifications has been developed and are described below. These specifications must be met by the steel supplier as well as an independent testing plan to be performed by Argonne National Laboratory (ANL). The independent testing is divided into three parts: on-site inspection of the cold rolling process and subsequent slitting of the coil into individual sheets; off-site tests on the magnetic properties of the steel sheet; off-site tests of the internal stress of the sheet.