Neutrino Cryogenics Requirements Meeting 25/09/2014 Day 1 review.

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Presentation transcript:

Neutrino Cryogenics Requirements Meeting 25/09/2014 Day 1 review

Neutrino Cryogenics Requirements Meeting 25/09/2014 Good / open presentations

Neutrino Cryogenics Requirements Meeting 25/09/2014 Points to be discussed further: Maximum temperature gradients allowed in the sensitive volume What is this maximum allowable temperature gradient / (vertical) meter What will be the stratification in a large argon volume with a low heat input Is argon circulation (for purification purposes) breaking this stratification Should “ICARUS” wall cooling be implemented to break this stratification (has research been done?)

Neutrino Cryogenics Requirements Meeting 25/09/2014 Points to be discussed further: Which system to be foreseen for the argon gas purification Active copper with “in place regeneration” More flexibility since on-site regeneration Commercial Hydrosorb/Oxisorb system, regenerated by the manufacturer. What will be the interval between generations in cooling / filling sequence, and in normal operation

Neutrino Cryogenics Requirements Meeting 25/09/2014 Points to be discussed further: What should be foreseen for the cryostat ullage? Internal “warm oullage” Advantage: “easy” feed throughs Disadvantage: outgassing Internal “cold ullage” Advantage: diminish the outgassing of the cables and cryostat walls; Disadvantage: What is the effect of “cooling jet” on purification process; which feedthrough shall be used? External warm ullage: Advantage: no outgassing in cryostat volume; Disadvantage: cold feedthroughs, second argon volume to be placed in neighbourhood of cryostat, how to cool the cryostat volume?

Neutrino Cryogenics Requirements Meeting 25/09/2014 Points to be discussed further: Liquid connection at the bottom of the cryostat seems to be necessary (liquid purification, emptying of cryostat,…) how can such a connection be safely implemented?

Neutrino Cryogenics Requirements Meeting 25/09/2014 Points to be discussed further: What is the best re-condensing principle (stability in regulation): Cooling liquid evaporating at the internal of heat exchanger and condensing at the outside; Cooling liquid evaporating at the outside of the heat exchanger and condensing at the inside

Neutrino Cryogenics Requirements Meeting 25/09/2014 How to define the correct control system needed for such an installation; Operator friendly; “upgradable” (long term availability); One operating system for the complete cryogenic installation; …..

Neutrino Cryogenics Requirements Meeting 25/09/2014 How to measure long life-time purities? Are the current monitors still “usable” Should the cryostats be equipped with internal monitors?

Neutrino Cryogenics Requirements Meeting 25/09/2014 Is it clear what is needed for the correct functioning of a neutrino detector (are we sure the input requirements are known?) What should be the minimum lifetime the purification system has to be developed for?