Hi folks:
Thanks for the very informative meeting today. I extracted a very brief set of actions.
There are a lot of materials uploaded to the indico today.
Matteo has uploaded some pictures from the GEANT physics simulations for the FPF
configuration options. These are here
https://drive.google.com/drive/folders/1AK5-bf77n9wE5OIAHl7BQjYACUKEh-iL?usp=sharing
Here is a summary of next actions that we agreed on:
1) For the purposes of a conceptual design, there is no need to firmly choose an option.
Let’s keep two options open:
A. The GTT cryostat option has many advantages and some significant disadvantages.
i. It is now well known technology.
ii. It allows for building the cryostat in place by bringing in pieces.
iii. There is flexibility in terms of putting in feedthroughs, penetrations, etc. This is now
well known.
iv. The walls are able to support the volume of liquid argon.
disadvantages
i. Only a single vendor
ii. Significant heat loss if we make walls thin.
iii. Significant loss of volume in the insulation
iv. A steel structure is needed.
B. A vacuum insulated cryostat or microboone-like cryostat solve a few problems and add some disadvantages
i. We will need a design and evaluation.
ii. We will need to figure out how to build it in place.
iii. Support will need to be considered to hold the mass.
——x
We will keep both options for the conceptual design report. And have a plan to quickly close the options immediately after the CDR. Meanwhile, we need to produce a set of requirements, some will be specific for the two options above.
The main issues to consider for the requirements are
Safety: How to comply with the ODH standards at CERN. We will get guidance on this as we proceed. How to fill and empty the cryostat depending on the cryogenic conditions ?
Ratio of detector to total volume must be optimized.
Maximum power needed to keep the cryogenic system working either with or without the
Turbo-Brayton unit.
Maximum cooling power allowed. This will limit what we can do in terms of detector electronics
and operations.
Steve Trabocchi will take ownership of the sheet of requirements (to be kept with other
materials by Connor).
Sincerely,
Milind Diwan
diwan@bnl.gov
