Open AccessCryogenic Design of the D0 Liquid Argon Collider Calorimeter
Author(s) -
G.T. Mulholland,
K. Krempetz,
R. Luther,
R. Wands,
K. Weber
Publication year - 1987
Language(s) - English
Resource type - Reports
DOI - 10.2172/1030699
Subject(s) - calorimeter (particle physics) , physics , collider , argon , nuclear physics , detector , tevatron , fermilab , particle accelerator , beam (structure) , proton , atomic physics , optics , large hadron collider
The superconducting Tevatron was added to Fermilab's 400 Gev Proton Accelerator, the main ring, in 1983. An antiproton source was added in 1985, and the system became a p-pbar, 1 Tev/I Tev, collider in 1987. A CoIIider Detector surrounding one of the points of the accelerator p-pbar beam crossings can measure virtually all the energy of the colliding interaction (Fig. I.) The measurement of all the energy is called hermetic calorimetry. Although there are other liquid argon calorimeters and other hermetic coIIider detectors, the D-Zero (named for the accelerator beam crossing location) liquid argon collider calorimeters will be the first of their kind (Fig. 2). The cryogenic aspects of the liquid argon calorimeter portion of the D-Zero detector are described here. The liquid argon serves as the particle detector ionizing media in a repetitive cell structure (Fig. 3) of argon, signal board, argon, and Uranium or copper absorber plate, with a superimposed electric field. Local signal board pads indicate location and the electric charge collected is proportional to the ionization and the ratio of the argon to plate absorption lengths. This arrangement provides a dense, intrinsically calibrated, drift-free calorimeter