atlas energy

Cryogenic Improvements for the ATLAS Energy Upgrade Cryogenic Operations Workshop May 9-11, 2006 Presented by Steve MacDonald Argonne National Laboratory A U.S. Department of Energy Office of Science Laboratory Operated by The University of Chicago Office of Science U.S. Department of Energy Presentation Overview • • • • • • ATLAS Overview Cryogenic System Staged Construction Energy Upgrade Refrigerator Installation Project Expected Benefits Questions Office of Science U.S. Department of Energy Pioneering Science and Technology ATLAS Facility Overview • • • • • Argonne Tandem Linear Accelerating System (ATLAS) World’s First Superconducting Ion Accelerator Located at Argonne National Laboratory National user facility funded by DOE ~6000 hrs/yr beam on target Pioneering Science and Technology Office of Science U.S. Department of Energy Split Ring Type Superconducting RF Cavities • • 47 Total 12 Cryostats - 7 Accelerating, 6 cavities each - 5 Bunchers, 1 cavity each Pioneering Science and Technology Office of Science U.S. Department of Energy Original LHe Flow Schematic • • • • • • Model 1400 installed 1978 1400 replaced by 1630 in 1980 Series arrangement Staged construction Cryostat heat exchangers Supply line undersized • • Supply pressure set by refrigerator/booster secondary Return pressure maintained by dewar heater Pioneering Science and Technology Office of Science U.S. Department of Energy ATLAS Section Dedicated 1985 • • • • Added 300 watt CTI model 2800 Increased supply line size Need for cross-connect Higher pressure in Booster • Dewar level control - Requires ~30 watts excess - Susceptible to load changes Pioneering Science and Technology Office of Science U.S. Department of Energy Positive Ion Injector (PII) Cryostats and Cavities 1992 • • 3 Cryostats 6 Cavities Each Gravity fed Pioneering Science and Technology Office of Science U.S. Department of Energy Current ATLAS LHe Flow Schematic ATLAS LHe SYSTEM PHASE SEPARAT OR 4T 3T 6T 5T 2800W BOX M M 1630 2T 3W E1 4TT 1T 3MM 1M M 2MM 1WE1 2W E1 2T T 2800E BOX T 5TT 3TT 1TT BOX T T 1L HX L HX J 1J 1 K HX K WE 2 L DEWAR (1000L) WE 1 J DEWAR (1000L) WE 3 K DEWAR (1000L) N.O . VA LVE TEST CRYOSTAT BOX Z 2Z N.C . VA LVE THR OTTL E VALVE 3Z BOX R CON TROL LED V ALV E 1Z 6M 4M 2M BOX D BOX A 5M 6A 4A 1M 1 R 2 R BOX U BOX P BOX N 7M BOX B HX B BOX C HX C 4D HX C 2S 4U 3U BOX V BOX E HX E BOX F HX F BOX G 6G 4G BOX W BOX X 3S 5A 3A 3B 3C 3D 1S 3 V 6V 3E 3F 3G 5G 3W 6W 3X 6P 3P 6N 3N 3M 5P 4P 2P 1P 4N 5N 2N 1N BOX M 2A 1A 2B 1B 2C 1 C 2D 1 D 2U 1U 1V 2V 4V 5V 1E 2E 1F 2F 1G 2G 1W 2W 4W 5W 1X 2X BOX S P O N B1 A B C D B2 B3 E F G B4 M5 B5 PII LINAC CRYOSTATS BOOSTER LINAC CRYOSTATS ATLAS LINAC CRYOSTATS J.R.Specht 1/15/96 REV 1 : 09/03/03 File # ATALSHE2.VC6 Pioneering Science and Technology Office of Science U.S. Department of Energy ATLAS Energy Upgrade ~25-40% Increase in beam intensity Replace the last cryostat in ATLAS Install 300 watt CTI model 2800 New ATLAS Cryostat Pioneering Science and Technology Office of Science U.S. Department of Energy 2800 Installation • Critical tasks - Helium line design and fabrication - Refrigerator testing - Installation Pioneering Science and Technology Office of Science U.S. Department of Energy 2800 Center Test • • • • • • Last operated in late 90’s Test the repair of shipment damage/modification 80 K trap differential pressure Control system operation Capacity check Equipment - Existing spare compressors - RDT Transfer line - 250 Liter portable dewar w/heater Pioneering Science and Technology Office of Science U.S. Department of Energy 2800 Damage Pioneering Science and Technology Office of Science U.S. Department of Energy 2800 West Flow Schematic Pioneering Science and Technology Office of Science U.S. Department of Energy Installation Schedule Summary - 1 Week shut down - 3 Week installation -1 Week startup Pioneering Science and Technology Office of Science U.S. Department of Energy Benefits • Provide capacity for new cryostat • Add stability and decrease operating costs - Increase operating margin ~10% - Abandon dewar level control - Half of the cryo group call-ins - 1630 is highest maintenance item - ~20% of cryogenic budget/yr - Shut down every 4-6 months as opposed to 18 months Easier to shutdown 2800 East Run 2-3 cryostats with 2800 East down Vacuum break Office of Science U.S. Department of Energy • • • Pioneering Science and Technology Presentation Summary • • • • • ATLAS Overview Cryogenic System Staged Construction Energy Upgrade Refrigerator Installation Project Expected Benefits Pioneering Science and Technology Office of Science U.S. Department of Energy