TBM Vacuum considerations

Alex Vamvakas15/07/2015

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Outline• Existing system• Proposed changes• Points to be discussed

15/07/2015

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T0 vacuum systemCentral tank• Central pumping• Coupling of 2 girders• UHV tests not achieved• No damping material

15/07/2015

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Decoupling of the two girders:

• Mini pumps on PETS and SAS

• Independent vacuum tank for MB

• Similar configuration tested in CLEX

New vacuum system proposal

15/07/2015

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Mini pumps on PETS and SAS

Considerations:

• Number of pumps (2/PETS,SAS)

• Supports

• Heat transfer to PETS and SAS (pumps power?)

• Reducing flanges

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Mini pump on T1 PETS

Rotate PETS vacuum chamber by 90o:

• Possible, as PETS not yet fabricated

• No support needed

Considerations:

• Vertical position OK?

• Very tight clearance with PETS core, offset needed?

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MB Vacuum network T0.2Considerations:

• 2 pumps enough?

• Ports for external pumping, sensors

15/07/2015

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MB Vacuum network T1Considerations:

• 2 pumps enough?

• Ports for external pumping, sensors

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Vacuum networkConsiderations:• Tubing dimensions• Forces on SAS• Bellows necessary?

• Total weight per waveguide:2kg per load1kg from tank assembly

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General comments• Pumps control:

• Power• DAQ• Interconnection with thermal/alignment measurements

• Pumps vibration• Isolation required?

• Next steps?

15/07/2015