HOBC: a small, rapid cycling, heavy liquid holographic bubble chamber

After the success of the holographic test in BIBC in June 1980, it was quite clear that a simple physics experiment could be devised around a small rapid cycling bubble chamber using holographic techniques. The choice of heavy liquid for the filling of the chamber had the advantage of making use directly of the results obtained in the BIBC test for the resolution and the bubble density. This experiment now known as P 155 has been recommended in January 1981 by the CERN SPSC. The bubble chamber used as vertex detector for this experiment is known as HOBC which is just an acronym for Holographic Bubble Chamber. This small chamber is being designed and built by the EHS group (EF Division) at CERN. Details of the design are given. (author)