An Overview of the Planned Jefferson Laboratory 12

An Overview of the Planned Jefferson Laboratory 12 Ge. V Helium Refrigerator Upgrade Dana M. Arenius Jefferson Laboratory Cryogenics Dept Head This work is supported by the United States Department of Energy (DOE) contract #DE-AC 05 -060 R-23177 Cryogenics Operations 2008, CERN, Geneva, Switzerland 1 Author, 22 th-26 th September 2008

Jefferson Lab Today 2000 member international user community engaged in exploring quark-gluon structure of matter Superconducting accelerator provides 100% duty factor beams of unprecedented quality, with energies up to 6 Ge. V CHL CEBAF’s innovative design allows delivery of beam with unique properties to three experimental halls simultaneously A B C Each of the three halls offers complementary experimental capabilities and allows for large equipment installations to extend scientific reach Cryogenics Operations 2008, CERN, Geneva, Switzerland 2 Dana Arenius, 22 th-26 th September 2008

CEBAF Site Overview CHL ARC A LINACS Cryogenics Operations 2008, CERN, Geneva, Switzerland 3 B C Dana Arenius, 22 th-26 th September 2008

Upgrade magnets and power supplies 11 6 Ge. V CEBAF 12 CHL-2 Two 1. 1 0. 6 GV linacs Enhanced capabilities in existing Halls Lower pass beam energies still available

Additional Loads of 12 Ge. V • CEBAF Accelerator (Each new cryomodule) » Up to 300 W at 2. 1 K, Primary Load » Up to 300 W at 35 K, Shield Load • Hall D (inclusive of cryogen distribution system) » 100 W at 4. 5 K refrigeration » 0. 7 g/s of liquefaction (lead cooling) Cryogenics Operations 2008, CERN, Geneva, Switzerland 5 Dana Arenius, 22 th-26 th September 2008

CHL Max Capacity, Current vs. New • Current 6 Ge. V (CHL #1) » Load: 4. 25 k. W @ 2. 1 K, 11. 65 k. W @ 35 K » Capacity: 4. 6 k. W @2. 1 K, 12 k. W @ 35 K » 10 g/s liquefaction • New 12 Ge. V (CHL #1 + new CHL#2) » Load: 7. 25 k. W @ 2. 1 K, 14. 65 k. W @ 35 K » Capacity: 9. 2 k. W @ 2. 1 K, 24 k. W @ 35 K » 25 g/s liquefaction (2. 1 K SYSTEMS NEEDS VERY WIDE REDUCED LOAD OPERATING DOMAINS) Cryogenics Operations 2008, CERN, Geneva, Switzerland 6 Dana Arenius, 22 th-26 th September 2008

Floating Pressure and Ganni Cycle • Existing CHL#1 4600 W @ 2. 1 K plant will continue to use the JLab Floating Pressure Cycle technology • The baseline design specification for CHL#2 4600 W @ 2. 1 K is based on the full JLab Ganni Cycle process for new plants Cryogenics Operations 2008, CERN, Geneva, Switzerland 7 Dana Arenius, 22 th-26 th September 2008

Screw Compressor Characteristics Screw Compressor Efficiency vs. Pressure Ratio Graphs FIGURE 1. 3 BRV=2. 2 1 st Stage FIGURE 1. 4 BRV=2. 6 2 nd Stage Similar Peaks in efficiency exist for built-in volume ratios

Standard Process Cycle Cryogenics Operations 2008, CERN, Geneva, Switzerland 9 Dana Arenius, 22 th-26 th September 2008

Ganni Cycle Example Cryogenics Operations 2008, CERN, Geneva, Switzerland 10 Dana Arenius, 22 th-26 th September 2008

CHL#2 Systems Already in Place ü ü ü ü Gaseous Helium Storage LN 2 Storage Dewars (twin 80, 000 liter) Cold Compressor Sets (twin 245 g/s) Helium Gas Purification and Contamination Monitors Guard Vacuum Subsystem (2. 1 K operations) Building for lower 80 -4. 5 K Cold Box Outdoor Foundation for upper 300 -80 K Cold Box Linac Cryogen Distribution Piping (ok for double flow) Cryogenics Operations 2008, CERN, Geneva, Switzerland 11 Dana Arenius, 22 th-26 th September 2008

New Equipment for CHL#2 • 4. 5 K cold box and warm helium compressors » Two sectional 4. 5 K cold box, (300 -80 K, 80 K-4. 5 K) » Design baseline is JLab’s Ganni Helium Process Cycle » Supports 4600 W @ 2. 1 K and 12 k. W at 35 K • • • Compressor oil removal system Computer distributive control system Cooling Water System (twin 15, 200 l/min) Electrical Power (twin 5 MW, 4160 V) Helium Dewar, 10, 000 l 4800 ft 2 compressor building Cryogenics Operations 2008, CERN, Geneva, Switzerland 12 Dana Arenius, 22 th-26 th September 2008

New CHL-2 Equipment Layout Cryogenics Operations 2008, CERN, Geneva, Switzerland 13 Dana Arenius, 22 th-26 th September 2008

Major CHL-2 Equipment 4. 5 K Refrigerator Helium Compressors Cold Compressors Cryogenics Operations 2008, CERN, Geneva, Switzerland Oil Removal 14 Dana Arenius, 22 th-26 th September 2008

Hall D Site Plan Hall D Counting House Cryo Bldg New Cryogenic Plant Cryogenics Operations 2008, CERN, Geneva, Switzerland 15 Dana Arenius, 22 th-26 th September 2008

Hall D Refrigerator Equipment On-Hand üTwo CTI Cryogenics Helium RS Compressors üCTI M 2800 200 W 4. 5 K Helium Refrigerator üLHe Subcooler Dewar üMotor Starters, 480 V Refrigerator Cryogenics Operations 2008, CERN, Geneva, Switzerland Compressors 16 Dana Arenius, 22 th-26 th September 2008

Hall D Refrigerator New Equipment • • • Gas Management Valve Control Rack LN 2 storage, 10, 000 liter dewar One 4000 cf Helium Gas Storage Vessel Integrated Refrigerator Computer Controls Instrument Air System, 15 scfm Purification Loop Piping to the CHL via N. Linac 640 ft 2 building Compressor/Turbine Cooling Water 480 V, 200 k. W compressor power Cryogenics Operations 2008, CERN, Geneva, Switzerland 17 Dana Arenius, 22 th-26 th September 2008

12 Ge. V Cryogenic Schedule October 2006 – October 2008 January-April 2009 October 2010 February 2011 CD-2, Project Engineering and Design CD-3, Project Construction Status CHL#2 Major Component Purchase CHL#2 Building Construction Complete CHL#2 Utilities Construction Complete CHL#2 Major Equip Delivery/Installation Hall D Refrigerator Building BOD Hall D Refrigerator Installation CHL#2 Commissioning Hall D Refrigerator Commissioning May-November 2011 October 2011 -April 2012 February 2012 CD-3 (Construction Status) was approved by the US DOE on Sept 15, 2008 Cryogenics CD-2 work is currently ahead of schedule and under cost Cryogenics Operations 2008, CERN, Geneva, Switzerland 18 Dana Arenius, 22 th-26 th September 2008

Questions/Discussion Thank You for Your Kind Attention May We Answer Your Questions ? Cryogenics Operations 2008, CERN, Geneva, Switzerland 19 Dana Arenius, 22 th-26 th September 2008