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					 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
Office of Science
U.S. Department of Energy   Operated by The University of Chicago
Presentation Overview

   •      ATLAS Overview
   •      Cryogenic System Staged
          Construction
   •      Energy Upgrade
   •      Refrigerator Installation Project
   •      Expected Benefits
   •      Questions

  Pioneering                                  Office of Science
  Science and                                 U.S. Department
  Technology                                          of Energy
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                                           Office of Science
     Science and                                          U.S. Department
     Technology                                                   of Energy
Split Ring Type Superconducting RF Cavities
  •    47 Total
  •    12 Cryostats
        - 7 Accelerating, 6 cavities each
        - 5 Bunchers, 1 cavity each




  Pioneering                                Office of Science
  Science and                               U.S. Department
  Technology                                        of Energy
Original LHe Flow Schematic

•   Model 1400 installed 1978   •   Supply pressure set by
•   1400 replaced by 1630 in        refrigerator/booster
    1980                            secondary
•   Series arrangement          •   Return pressure
                                    maintained by dewar
•   Staged construction             heater
•   Cryostat heat exchangers
•   Supply line undersized




    Pioneering                                               Office of Science
    Science and                                              U.S. Department
    Technology                                                       of Energy
ATLAS Section Dedicated 1985

  •      Added 300 watt CTI model 2800   •   Dewar level control
  •      Increased supply line size           - Requires ~30 watts excess
  •      Need for cross-connect               - Susceptible to load changes
  •      Higher pressure in Booster




  Pioneering                                                    Office of Science
  Science and                                                   U.S. Department
  Technology                                                            of Energy
                  Positive Ion Injector (PII) Cryostats
                           and Cavities 1992




•      3 Cryostats 6 Cavities Each
•      Gravity fed


    Pioneering                                      Office of Science
    Science and                                     U.S. Department
    Technology                                              of Energy
Current ATLAS LHe Flow Schematic
                                              ATLAS LHe SYSTEM
                                                                                                                                                                                                                                                                                                              PHASE
                                                                                                                                                                                                                                                                                                              SEPARAT OR




                                                                                                                                                                                                                                                                                                                   4T
                                                                                                                                                                                                                                                                                                                                  3T

                                                                                                                                                                                                                                                                                                              6T        5T


                      2800W                                                                                                               1630                                                                                                                                                                                                                                                                2800E
                                                     BOX M M
                                                                                                                                                                                                                                                                                                                                  2T

                                                                                                                                                                    3W E1
                                                                                                                                                                                                                                                                                                                                                        4TT
                                                                                                                                                                                                                                                                                                                                  1T                                        2T T
                                                               3MM

                                                    1M M             2MM                                                                                    1WE1               2W E1                                                                                                                               BOX T
                                                                                                                                                                                                                                                                                                                                                        5TT           3TT      1TT




                                                                                                                                                                                                                                                                                                                                              BOX T T

                                                                                                       1L
                                                                                                              HX L                                                                                    HX J               1J                                                1K             HX K

                                                           WE 2                                                                                                    WE 1                                                                                                                                                                                               WE 3
                                                                                                       L DEWAR                                                                                        J DEWAR                                                              K DEWAR
                                                                                                            (1000L)                                                                                    (1000L)                                                                  (1000L)
                                                                                                                                                                                                                                                                                                                                                                                                    N.O . VA LVE

                  TEST                                                                                                                                                                                                                                                                                                                                                                              N.C . VA LVE
                CRYOSTAT                      BOX Z
                                               2Z
                                                                                                                                                                                                                                                                                                                                                                                                    THR OTTL E VALVE
                                                         3Z
                                                                                                                                                                                                                                             BOX R                                                                                                                                                  CON TROL LED                  V ALV E
                                               1Z




                                                                           6M
                                                                                                                                                                                                         BOX D                     1R
                                                                                   4M        2M
                                                                                                                                                                                                                                             2R

                                                                                                                                                                                                                                                            BOX U
      BOX P                          BOX N                                 7M                                        BOX A                  BOX B                           BOX C                                                                                                         BOX V                            BOX E                   BOX F                             BOX G                    BOX W               BOX X
                                                                                                                                                                                                                         4D
                                                                                                                                            HX B                            HX C                         HX C                                                                                                                          HX E                    HX F
                                                                                                                                                                                                                                                  2S
                                                                                                                                                                                                                                                       4U

                                                                                        5M                      6A                                                                                                                                               3U                                                                                                                            6G
                                                                                                                      4A                                                                                                                                                                                                                                                                 4G
                                                                                                  1M                                                                                                                                    3S

     6P              3P             6N                   3N                3M                                   5A              3A                     3B                                   3C                           3D                       1S                                 3V             6V                       3E                    3F                               3G         5G        3W             6W              3X



5P        4P    2P        1P   4N        5N         2N        1N
                                                                                BOX M                                      2A        1A          2B         1B                     2C            1C             2D            1D                            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                                                                                                                                                                                                                                                                                                                                                          Office of Science
               Science and                                                                                                                                                                                                                                                                                                                                                         U.S. Department
               Technology                                                                                                                                                                                                                                                                                                                                                                  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                                Office of Science
    Science and                               U.S. Department
    Technology                                        of Energy
2800 Installation

•   Critical tasks
     - Helium line design and
        fabrication
     - Refrigerator testing
     - Installation




    Pioneering                  Office of Science
    Science and                 U.S. Department
    Technology                          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                      Office of Science
     Science and                     U.S. Department
     Technology                              of Energy
2800 Damage




  Pioneering    Office of Science
  Science and   U.S. Department
  Technology            of Energy
2800 West Flow Schematic




  Pioneering               Office of Science
  Science and              U.S. Department
  Technology                       of Energy
              Installation
              Schedule Summary
              - 1 Week shut down
              - 3 Week installation
              -1 Week startup
Pioneering                            Office of Science
Science and                           U.S. Department
Technology                                    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
  Pioneering                                         Office of Science
  Science and                                        U.S. Department
  Technology                                                 of Energy
Presentation Summary

   •      ATLAS Overview
   •      Cryogenic System Staged
          Construction
   •      Energy Upgrade
   •      Refrigerator Installation Project
   •      Expected Benefits



  Pioneering                                  Office of Science
  Science and                                 U.S. Department
  Technology                                          of Energy