Contract Notice Laboratory Optical And Precision Equipments Excl Glasses KryostatDescription Dry Dilution Refrigerator With Insert 3He 4He Dilution Unit With Welded Step Heat Exchanger And No Soft Solder Joints In The Dilution Unit The Dilution Unit Must Be Exchangeable Without Removing The Wiring Of The Cryostat And The Copper Plates At All Cooling Stages Pulse Tube Cooler Pt420 Rm Or Equivalent And A Linear Motor Drive Of The Rotary Valve Guaranteed Base Temperature Of 10 Mk Experimental Volume Of At Least 30 Cm In Diameter And 60 Cm In Height A Minimum Cooling Power Of 500 Uw At 100 Mk And 16 Uw At 20 Mk With The Compressor Bypassed Cool Down Time From 300 K To 10 Mk In 24 Hours An Appropriate Gas Handling System Ghs Including All Necessary Pumps Compressors Flow Meter Valves Mixture Tanks Etc The Ghs Must Be Fully Automatic I E Software Controlled The Entire Cooling Cycle Is Software Controlled And Automatic Including The Ghs But Also Must Allow For Manual Control Of The Refrigerator All Pumps And Compressor Are Oil Free The Control Unit Must Automatically Recover From Power Faults In A Manner That Ensures The Safety Of The Refrigerator Control Unit Including The Possibility For Full Remote Control Including Software And Process Control System The Cold Trap Must Allow For Proven Continuous Refrigerator Operation Experimental Proof In An Existing System Without The Need Of Any Liquid Cryogenics For 2 Years The System Must Be Integrated In The Dry Fridge Support Frame For The Cryostat A Central Rod In The Dilution Fridge That Allows For A Maximum Load Of At Least 200 Kg Below The Mixing Chamber Plate Without Affecting The Cooling Performance Of The Cryostat Baffels Of Metal Plates That Might Be Installed In The Rod At Different Temperature Stages Acting As Radiation Shields Have To Be Removable In Order To Install A Custom Made Spring System Provided By Tum From 300 K To 10 Mk At A Later Stage Heavy Duty Support Frame To Damp Vibrations And To Stand The Extended Payload Of The Setup All Components For The Interconnection Of Dry Dilution Refrigerator And The Gas Handling System With All Necessary Measures To Decouple Mechanically And Electronically Thermometry At Different Temperature Stages Including Readout And Control Full Documentation Of All Processes Required For The Operation And Control Of The Refrigeration Superconducting Nbti Wiring 56 X 2 Channels From 4 K To Mixing Chamber And Cu Wiring 56 X 2 Channels From 300 K To 4 K With Appropriate Connectors And A Breakout Box At Room Temperature A System For He 4 Condensation Into A Reservoir On The 4 K Temperature Stage He Battery Which Allows A Temporary Operation Typically 3 H Of The Refrigerator At Base Temperature With The Pulse Tube Cooler Being Switched Off Including All Necessary Equipment Tubing Heat Exchanger And Connections To He Supply At 300 K The Functionality Of The System Has To Be Experimentally Proven In An Existing Setup And Must Be Commercially Available Manual Operation And Control Of The System Via A Control Panel Custom Layout Of The System To Adapt It To The Laboratory At Tum And Ready To Operate Installation And Proof Of Operation Of The System On Site At Tum Including Operating Instructions And Training For Tum The He4 He3 Mixture Is Not Part Of The Supply Contract And Will Be Provided By The Tum The Necessary Information Amount And Mixing Ratio Will Be Provided By The Contractor Well Before The Installation At The Tum The Provided Mixture Will Be Inserted During The Installation Of The System On Site The Rotary Pump For The Mixing Circuit Is Not Part Of The Supply Contract And Will Be Provided By Tum Time Limit For Receipt Of Tenders Or Requests To Participate Date 03 06 2019 Local Time 12 00
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