wad VG a ysl mae “ bese | Port Vil Physical Research :seé HIGH ENERGY PHYSICS (UNCLASSIFIED) Argonne National Laboratory A high energy physics program is being inaugurated at Argonne. Dr. Roger H. Hildebrand was appointed Associate Director of the Argonne National Laboratory for the high energy physics program, Duties of the new position include administering the construction of the 10-15 billion-electron-volt proton synchrotron, Preliminary design of this accelerator started in June, Brookhaven National Laboratory Design of the new Cosmotron coll at Brookhaven was completed, Changes were necessary in insulation specifications because of failure to pass 10,000-volt acceptance tests. Excessive moisture in the cambric tape was believed to be the cause of the failure, and the manufacturer accordingly agreed to predry all the cambric insulating tape as well as to use an extra finishing coat of varnish. At the end of September the manufacturer was working around-the-clock on a 6-day workweek in order tomake up as much of the delay as possible, Delivery of all conductors wes expected to be completed by mid-November, Operation of the Cosmotron is now expected to resume in January14 1959, University of California Radiation Laboratory at Berkeley The Bevetron resumed normal operation in August after repairs were made to the generator that broke down in April, During most of the period of breakdown the machine was operated on one generztor at lower energy and at a slower pulse rate, Also during this period modifications were made to the injector to permit maximum extraction of the beam into the racetrack. During August and September, performance of the Bevatron was generally satisfactory in spite of intermittent shutdowns caused by minor troubles with the high voltage rectifier tubes (isnitrons) in the power supply. A grozp from Duke University operated their helium bubble chamber, using the Bevatron beam, to stucy hyperfragments, Other outside groups using the machine included those from Princeton Uriversity and the Massachusetts Institute of Technology. DOE ARGUIVES The 72-inch bubble chamber is substantially completed and is undergoing preoperational testing. This chamber will be capable of analyzing the entire range of nuclear interactions and events =tich the Bevatron can produce. It is the largest such device in the world. Prior to using liguid hydrogen in the chamber, the entire system will be thoroughly checked, using UNCLASSI FED