Proton Driver Cryogenics

1
Proton Driver Cryogenics

• Jay Theilacker
• March 15 , 2005

2
Outline

• Cryogenic Design Scope
• Heat Load and Capacity Requirements
• Design Concept
• Technical Feasibility
• Cost Estimate
• Conclusions

3
Cryogenic Design Scope

• Cryogenic Plant
• Cryogenic Distribution System
• Ancillary Systems

4
Cryogenic Plant

• Warm Compressors
• 4K Cold Box
• 2K Cold Box
• Cold Compressors
• Controls
• Installation Contracts

5
Spoke Option
6
Cryogenic Distribution System

• Low pressure cryogenic transfer line
• High pressure cryogenic transfer line
• Bayonet cans
• Expansion boxes
• Upstream string feed box and end caps
• Downstream string feed box and end caps
• Gas helium header

7
Ancillary Systems

• Cooling towers
• Helium gas storage
• Helium and nitrogen liquid storage
• Helium purifier
• Recovery compressors
• Miscellaneous ( arc cells, hydrometers,
  instrument air, etc)

8
Cryogenic Components

• Spoke Option
• 25 warm RF section solenoids
• 30 spoke CM solenoids
• 86 spoke resonators
• 336 elliptical cavities
• Cryogenic distribution system
• Temperature levels 2K, 4K, 5-8K and 40-80K

9
Heat Load

• Estimated total heat load
• 0.2 kW (static) 0.5 kW (dynamic) 0.7 kW _at_
  2K
• 1.1 kW (static) 0.1 kW (dynamic) 1.1 kW _at_
  4K
• 0.6 kW (static) 0.3 kW (dynamic) 0.9 kW _at_
  5-8K
• 4.3 kW (static) 6.1 kW (dynamic) 10.4 kW _at_
  40-80K
• Static to the total heat load at 2K is 26
• Heat load uncertainty factor is 30
• Over capacity is 50

10
Plant Performance Requirements

• Plant installed capacity
• 1.5 kW _at_ 2K
• 2.5 kW _at_ 4K
• 2.1 kW _at_ 5-8K
• 25.1 kW _at_ 40-80K
• Plant installed power - 2.1 MW
• COPs
• 588 W/W _at_ 2K
• 240 W/W _at_ 4.5K
• 168 W/W _at_ 5-8K
• 17 W/W _at_ 40-80K
• Good partial load efficiency

11
Design Concept

• Cryogenic Plant
• Hybrid plant
• Cryogenic Distribution System
• Cryogenic Unit
• Up to 9 cryo modules
• Two strings
• Upstream String at 4K One cryo unit
• Downstream String at 2K Five cryo units
• Ancillary Systems
• Industrially available components

12
Technical Feasibility

• Cryogenic Plant
• All major components of the Proton Driver helium
  refrigerators have been used successfully in
  similar systems before LHC, SNS, CEBAF, etc.
• Cryogenic Distribution System
• Design of cryogenic distribution system
  components has low technical risk
• Ancillary System
• All elements are commercially available

13
Design Issues

• Refine Heat Load Requirements
• Efficient Partial Load Operation
• Long Strings Of Cryogenic Modules
• Schedule and Resources

14
Cost Estimate

• Cost model based on the LHC methodology
• Model was verified against SNS actual cost
• Ancillary systems - based on the actual costs

15
Conclusions

• PD cryogenic system is technically feasible
• PD cryogenic system is financially predicable.
  Cost estimate is consistent with SNS actual cost,
  LHC project methodology, TESLA TDR, and US LCSG
  cost estimate approach
• Technical and cost risks are deemed to be either
  low or medium/low
• Design of new cryogenic distribution components
  has low technical risk
• Proton Driver RD at SMTF will assist to improve
  heat load requirements and optimize cost

16
Reference Material Follows
17
Cryogenic Unit
18
Heat Load Spoke Option
19
Refrigerator Capacity
20
Refrigeration Technology
21
Cryogenic Cost Estimate
22
Cryogenic Cost Estimate Notes

• Notes
• Ancillary equipment
• No GA is included
• No contingency is included
• to Exchange rate is 1.3
• Cost of the Linac Instrumentation and Controls is
  not included
• Costs Basis
• CERN - LHC
• SNS
• Vendor quote
• DESY TTF
• AD/Cryogenic Department
• Engineering judgment