The Northwestern University 50 cm Liquid Helium Bubble Chamber

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Abstract
The Northwestern University 50 cm liquid helium bubble chamber had its engineering run at the University of Chicago cyclotron in October 1965, after a construction and testing period of just under 2 yr. The chamber dimensions are approximately 50×25×32 cm, and the water‐cooled magnet can provide a field of 30 kG. The chamber and magnet, which weigh about 2.2×105 N, can be lifted into a beam site while in operational condition, and the chamber and magnet require a space of only 7.6×4.5 m in the beam line. The expansion is performed by a bellows located above the magnet. A repetition period of 1.2 sec/pulse has been achieved continuously. The optical system uses dark field illumination with three cameras which view the entire chamber with a maximum stereo angle of 16°. The cameras use 35 mm film and have a demagnification of 1/12. The chamber has produced approximately 106 useful photographs in three separate runs, and these pictures are currently being analyzed.

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