1 / 11

Cryomodule Helium Volumes

Cryomodule Helium Volumes. Tom Peterson, Fermilab AWLC14 13 May 2014. Introduction. Most helium inventory in a long string of TESLA/ILC-style cryomodules is in the helium vessels Most volume is in the 300 mm pipe

fulton-watts
Download Presentation

Cryomodule Helium Volumes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cryomodule Helium Volumes Tom Peterson, Fermilab AWLC14 13 May 2014

  2. Introduction • Most helium inventory in a long string of TESLA/ILC-style cryomodules is in the helium vessels • Most volume is in the 300 mm pipe • During a power outage or severe cryogenic plant outage, the cryomodule string itself may act to provide temporary helium storage • The following provides a rough estimate of this storage capacity AWLC14, Cryomodules, Peterson

  3. Cryomodule cross section AWLC14, Cryomodules, Peterson

  4. AWLC14, Cryomodules, Peterson

  5. AWLC14, Cryomodules, Peterson

  6. Cryomodule helium inventory AWLC14, Cryomodules, Peterson

  7. Closed-volume warm-up process • Assume valve control is available • Isolation of supply valves to 2 K space • Isolation valve closes on 2 K vapor return • Retain insulation vacuum and beam vacuum • Static heat load warms helium • Process is warm-up of the 2-phase system starting at 2.0 K, 31 mbar AWLC14, Cryomodules, Peterson

  8. Results of first, coarse analysis XFEL AWLC14, Cryomodules, Peterson

  9. What that table says • Warm-up from 31 mbar to 1.5 bar takes 39 hours • Assuming relief valves open at 1.5 bar, venting would begin at approximately 39 hours • Result is evaporation of almost all the liquid • Final state is almost pure vapor at 1.5 bar AWLC14, Cryomodules, Peterson

  10. Sources of error, refinements • Seems nice, but • Thermal shield also warming up • Need second-order analysis incorporating slowly increasing static heat load • Still expect about one day before reaching venting pressure AWLC14, Cryomodules, Peterson

  11. Conclusions • This is just an order-of-magnitude analysis • Nevertheless, it illustrates the potential of the cryomodule itself as a temporary storage volume during lack of cooling • Implementation requires supply and return valves closing to provide closed volume • Suggest further analysis and consideration of options • Secondary effect of slow thermal shield warm-up • Actual volumes including distribution system • Real practical venting pressures • Required valves and control for inventory management • Etc. . . . This is just a quick look. AWLC14, Cryomodules, Peterson

More Related