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
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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
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Split Ring Type Superconducting RF Cavities
• 47 Total
• 12 Cryostats
- 7 Accelerating, 6 cavities each
- 5 Bunchers, 1 cavity each
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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
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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
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Positive Ion Injector (PII) Cryostats
and Cavities 1992
• 3 Cryostats 6 Cavities Each
• Gravity fed
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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
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ATLAS Energy Upgrade
- ~25-40% Increase in beam
intensity
- Replace the last cryostat
in ATLAS
- Install 300 watt CTI model
2800
New ATLAS
Cryostat
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2800 Installation
• Critical tasks
- Helium line design and
fabrication
- Refrigerator testing
- Installation
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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
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2800 Damage
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2800 West Flow Schematic
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Installation
Schedule Summary
- 1 Week shut down
- 3 Week installation
-1 Week startup
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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
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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