RFI's_1,_Helium_Dewar.pdf

Should the filter wheel be driven external, so as to allow the filter to be changed while the system is cold?

Yes

With regards to “filter wheel have to be light tight”, why since it’s already inside the light tight helium shield, and with regards to what light then?

Light tight refers to the mechanical interface between the filter wheel assembly and the LHe cold shield.

Should the cryostat have the option of being able to be laid horizontally while warm?

Yes

What is meant by “blank connector mounting plates”?

Blank connector mounting plates are just aluminum plates that could be installed on the Dewar instead of the hermetic MIL‐DTL‐38999 type feedthroughs. These will allow for vacuum leak checking of the Dewar, as well as provide a platform to install a different type of hermetic feedthrough

Should we also provide the air‐side plug fIs the temperature controller of the customer capably of using multiply 2A/50V heaters? Or do we need to limit to a single 1A/50V heater on both LN2 tank and the LHe tank?or the MIL‐DTL‐

38999 type feedthroughs?

Temperature is multiple heater capable. Multiple heaters are preferred for the

LN2 and LHe tanks.

What is the minimum bending radius of the wire tape cables? Minimum bend radius is 0.40”

Is one allowed to use metric threads? No, these would be incompatible with existing lab Dewars.

Can the customer approval technical drawings be provided by us in mm? Yes, but not preferred

Show we also provide the air‐side plug for the MIL‐DTL‐38999 type Yes

Question Response

Request For Information (RFI): FA940117T0025 Helium Dewar Solicitation

Must we deliver a technical drawing along with the quotation? Yes