1 Cary Kendziora Fermi National Laboratory Cary Kendziora Fermi National Laboratory CEC-ICMC 2013 Anchorage Alaska – June, 2012
2 CEC-ICMC 2013 Anchorage Alaska – June, 2012 Development and design of the Argon handling system have been a collaborative effort between Princeton University, Fermilab and UCLA Special Thanks to Hanguo Wang (UCLA)
L ike the jelly beans in this jar, the Universe is mostly dark energy and dark matter Only about four percent of the Universe - including the stars, planets and us - is made of familiar atomic matter. DarkSide is an experiment that is in search of Dark Matter CEC-ICMC 2013 Anchorage Alaska – June, 2012
DarkSide is located at the Laboratori Nazionali del Gran Sasso 130 km East of Roma Inside the Gran Sasso Mountain The mountain is used as shielding for cosmic rays CEC-ICMC 2013 Anchorage Alaska – June, 2012
Entrance to the Underground Lab CEC-ICMC 2013 Anchorage Alaska – June, 2012
Dark Side 50 Experiment CEC-ICMC 2013 Anchorage Alaska – June, 2012
Water Tank 10 m x 11 m CEC-ICMC 2013 Anchorage Alaska – June, 2012
4 m Stainless Sphere filled with Liquid Scintillator and PMTs CEC-ICMC 2013 Anchorage Alaska – June, 2012
The Detector is a Two Phase 50 Kg Liquid Argon TPC CEC-ICMC 2013 Anchorage Alaska – June, 2012
The two phase argon detector will allow the experiment to measure each event in two ways, by separately detecting the scintillation light and ionization electrons produced by the recoiling nuclei. Pressure and Liquid Level Stability are very Important CEC-ICMC 2013 Anchorage Alaska – June, 2012
Radon Free Stainless Clean Room on top of Water Tank CEC-ICMC 2013 Anchorage Alaska – June, 2012
Assembly of Detector inside of the Radon Free Clean Room CEC-ICMC 2013 Anchorage Alaska – June, 2012
Detector Installation in Cryostat CEC-ICMC 2013 Anchorage Alaska – June, 2012
Installation of Detector Flexible liquid transfer, signal cable, and vacuum lines CEC-ICMC 2013 Anchorage Alaska – June, 2012
Insertion of Detector in Veto Sphere CEC-ICMC 2013 Anchorage Alaska – June, 2012
Veto Sphere Inside of Water Tank
Detector in Veto Sphere CEC-ICMC 2013 Anchorage Alaska – June, 2012
Low Back Ground Argon Liquid Argon has excellent scintillation and ionization properties. Atmospheric Argon contains the 39Ar isotope. Underground argon has been shielded from cosmic radiation and is very low in the isotope. The DarkSide Argon comes from underground. The cost to produce this low background is approx. $50K per Kg CEC-ICMC 2013 Anchorage Alaska – June, 2012
Underground Low Background Argon Extraction Plant CEC-ICMC 2013 Anchorage Alaska – June, 2012
Cryogenic Gas Separation System Source Gas is only 5% Argon It requires a fairly complex cryogenic system to purify the argon. CEC-ICMC 2013 Anchorage Alaska – June, 2012
Final Gas Separation is done by a Cryogenic Distillation Column CEC-ICMC 2013 Anchorage Alaska – June, 2012
DarkSide Cooling Tower CEC-ICMC 2013 Anchorage Alaska – June, 2012
DarkSide Liquefaction and Purification System CEC-ICMC 2013 Anchorage Alaska – June, 2012
Recirculation and Purification System Simplified CEC-ICMC 2013 Anchorage Alaska – June, 2012
Condenser CEC-ICMC 2013 Anchorage Alaska – June, 2012
Condenser CEC-ICMC 2013 Anchorage Alaska – June, 2012
Heat Flux CEC-ICMC 2013 Anchorage Alaska – June, 2012
CEC-ICMC 2013 Anchorage Alaska – June, 2012 Copper Condenser Assembly
Argon Condenser Volume CEC-ICMC 2013 Anchorage Alaska – June, 2012
Slow Control User Interface CEC-ICMC 2013 Anchorage Alaska – June, 2012
DarkSide Argon Cooling Tower Used to Liquefy and Purify the Argon CEC-ICMC 2013 Anchorage Alaska – June, 2012
Stability Test at FermiLab CEC-ICMC 2013 Anchorage Alaska – June, 2012
Stability of Present Running System (15 min ) CEC-ICMC 2013 Anchorage Alaska – June, 2012
The Argon is Purified by a Commercial Purifier CEC-ICMC 2013 Anchorage Alaska – June, 2012
The present DarkSide LAr Purity: > 2 ms Equivalent to 150 part per Trillion (Oxygen) CEC-ICMC 2013 Anchorage Alaska – June, 2012
Planned improvements to the Argon System Rework the Super Insulation in Transfer Line and Cryostat to lower the heat transfer. CEC-ICMC 2013 Anchorage Alaska – June, 2012
37 Thank You Cary Kendziora Fermi National Laboratory Cary Kendziora Fermi National Laboratory CEC-ICMC 2013 Anchorage Alaska – June, 2012