how to select a chase research cryogenics cooler
The key design questions are:
What temperature do you want to achieve?
What hold time do you need?
What heat load must the cooler remove?
Around 1 Kelvin - You need a 4He cryocooler (Helium 4)
Around 250 - 350 mKelvin - you need a 3He cryocooler (Helium 7 or Helium 10)
Less than 250 mKelvin - you will need a dilutor
In each case the optimum model will depend on your requirements for hold time and heat load.
coolers: Do you want a rapid cycle (cool down, hold, warm up) or an
extended cold holding time lasting more than 24 hours? We have built
different models with hold times varying from 8 hours to 72 hours. See different examples here.
Continuous coolers: Our latest development is a continuous system offering months of cool. Find out more here.
there are trade-offs between base temperature, hold time and heat load
- the laws of physics apply and CRC coolers do not work by magic.
Sample specifications are:
Helium 4 coolers: hold time of 12 hours for heat load of 100 microWatts to 1 milliWatt.
Helium 7 coolers: hold time of 24 hours for heat loads of 10-50 microWatts on the 3He stage and 100 microWatts on the 4He stage.
Helium 10 coolers: hold time of 24 hours for heat loads of 50 microWatts on the ultracold 3He stage, up to 50 microWatts on the intermediate stage, and 100 microWatts on the 4He stage.
Continuous cooler: indefinite hold time, heat load of 20 microWatts.
Dilutors: Hold time of between 8 and 24 hours for a heat load of 2 microWatts.
you have any other partcular requirements we should know about? For
example, do you want it to operate your cooler at more than 30 degrees to vertical?
Are you intending to crash-land it from a balloon or shoot it into space on a rocket? Then you will need a
bespoke design. Fortunately we have the experience to advise you and if
it can be done, we will do it.