The Target Areas associated with ATLAS are shown in Figure II.1. Target Area II is the experimental area associated with the 24-resonator superconducting linac. The various pieces of equipment located in this area will be discussed in Section III.B. Target Areas III and IV are associated with the 42-resonator superconducting linac. The layout of Target Area III and the pieces of equipment installed will be discussed in Section III.C.
The following discussion deals with the beam line properties and facilities provided for transport of signals from experimental station to data/control room that presently exist for all target areas.
The beam lines are nominally 69 inches above the target area floors and are pumped by a combination of ion pumps and cryo pumps. Metal seals are used at all joints, except for rare exceptions where Viton O-rings are used. Clean vacuums in the 10-7 Torr range or better are normally maintained in all lines. Experimental stations are expected to maintain clean, oil-free conditions and users should discuss with the liaison person associated with the specific experimental station any proposed experiment which might introduce vacuum problems. Roughing of experimental stations is accomplished with megasorb carts utilizing a combination of carbon-vane and liquid nitrogen cooled sorption pumps or small turbo pump carts. High vacuum is obtained with He cryo pumps. The accelerator operator should be informed of any problems encountered with vacuums in the beam lines. The vacuums in the experimental stations are the responsibility of the experimentalist, and the liaison person assigned to the specific station should be contacted.
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For more detailed information regarding beam properties than those discussed in Section II.A., the liaison person associated with the specific experimental station should be contacted. Standard operating parameters for the optical elements are available from the accelerator operator. Tuning of the debuncher/rebuncher for obtaining energy or timing focusing of the linac beam is presently the responsibility of the experimentalist. Instructions for this procedure are available upon request from the accelerator operator.
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Each experimental station has a patch panel which provides the cabling for data transmission to an assigned patch panel in the data room. These assigned patch panels are located at various places in the data room and have dedicated racks for electronics. The number, and types of cables available for each station are discussed in the individual descriptions of experimental stations.
To assure a common clean ground, each experimental station has dedicated 110 AC power which can be used for signal preamplifiers and power bins in the experimental area and for the power bins at the assigned location in the data room. Power for pumps and other loads will not share the same ground, so experimental apparatus at signal ground should be isolated from the beam line, scattering chamber, etc.
Each experimental station is also provided with a patch panel for Faraday cup, collimator, and TV. monitor signals. These patch panels have cabling to a central patch panel in the experimental area which allows connection to permanent cabling to the charge integrator, current meters, and TV monitors located in the data and control rooms.
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