Year : 2013, Volume : 38, Issue : 1to4
First page : ( 160) Last page : ( 165)
Print ISSN : 0379-0479. Online ISSN : 2349-2120. Published online : 2013  3.

Design of still for dilution fridge

Mandal Bidhan Chandra¹, Naser Md. Zamal Abdul¹, Das Nisith Kumar¹, Pradhan Jedidiah¹, Roy Anindya¹, Mallik Chaturanan¹, Bhandari Rakesh Kumar¹

¹Variable Energy Cyclotron Centre, 1/AF, Bidhannagar, Kolkata-700064, India.

Abstract

In view of indigenous development of a dilution fridge at VECC, Kolkata, we have designed a ³He distillation chamber (Still) of 40 cc volume for efficient evaporation of ³He from the dilute solution. To ensure the requisite cooling power of the dilution fridge we have chosen, manganin wire heater (−400Ω) is glued to the exterior to the Still body. The Still is made of OFHC Cu. To reduce the ⁴He film flow, the diameter of 2.5 mm is used for the exit path in the pump-out line. The estimated Still power is of- 0.6 mW. RuO temperature sensor is tightly fitted with the still in an appropriate boring. A typical circulation rate of 15 μmol/s of ³He is considered for the fridge (estimated cooling power -10 μWatt @100 mK). This paper presents the detailed mechanical design along with analytical results of Still with film flow suppressor.

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Keywords

Still, Superfluid, Superfluid film flow, Cooling power.

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