Tenders Are Invited For Industrial Freezers – Dilution Fridge For Particle Physics

Industrial Freezers – Dilution Fridge For Particle Physics. The Physical Institute Of The University Of Zurich Plans To Purchase A Dilution Cryostate (Dilution Fridge = Df) In Order To Develop Superconductive Sensors For Use In Particle Physics And To Search For Slight Dark Matter (Dm). A Two-Component Payload Is Operated In The Df: 1) Superpaling Sensors Such As Tes Or Snspds Including Detectoring Art (Si, Sapphire, He) With Masses Between Grams And Kilograms. 2) Squid Auslese Electronics In Relative Proximity To The Sensors. Sensors And The Squids Should Be Free Of Magnetic Fields. The Basic Temperature Must Be On The Mixing Chamber With A Cooling Capacity Of At Least 400 Μw Below 10 Mk And At 100 Mk At At Least 400 Μw. The Experiment Should Be Able To Maintain Its Basic Temperature For At Least Three Months In Uninterrupted Operation. The Df Needs A Mechanical Pre -Cooling To Avoid External Coolant, Except For Smaller Amounts Of Liquid Nitrogen For The Gas System. The He3/He4 Mix In The Dilution Cooling Unit Is To Be Operated In A Closed Circuit. The Df Control And Software System Should Be Independent And Should Be Able To Allow The Operation And Data Withdrawal Via A Network. The Df Should Have Little Vibrations On The Mixing Chamber. In Order To Minimize Vibrations Of The Pumps And Compressors Of The Cooling Circuit Ourselves, We Must Be Able To Mount The Pulse Tube And The Compressors Separately From The Cryostate. When The Device Is Delivered, The Fulfillment Of All Requirements Must Be Demonstrated.