Three stage vacuum system for ultralow temperature installation

Autor:	Arup Roy, R K Bhandari, Z A Naser, B.Ch. Mandal, C Mallik, Parshotam Kumar, J. Pradhan, Nisith K. Das
Rok vydání:	2012
Předmět:	Cryostat History Engineering Leak business.industry Nuclear engineering Electrical engineering Scroll chemistry.chemical_element Computer Science Applications Education law.invention chemistry law Drag Vacuum chamber business Distillation Evaporator Helium
Zdroj:	Journal of Physics: Conference Series. 390:012055
ISSN:	1742-6596 1742-6588
DOI:	10.1088/1742-6596/390/1/012055
Popis:	We use a three stage vacuum system for developing a dilution fridge at VECC, Kolkata. We aim at achieving a cooling power of 20μW at 100mK for various experiments especially in the field of condensed matter and nuclear physics. The system is essentially composed of four segments-bath cryostat, vacuum system, dilution insert and 3He circulation circuit. Requirement of vacuum system at different stages are different. The vacuum system for cryostat and for internal vacuum chamber located within the helium bath is a common turbo molecular pump backed by scroll pump as to maintain a vacuum ~10−6mbar. For bringing down the temperature of the helium evaporator, we use a high throughput Roots pump backed by a dry pump. The pumping system for 3He distillation chamber (still) requires a high pumping speed, so a turbo drag pump backed by a scroll pump has been installed. As the fridge use precious 3He gas for operation, the entire system has been made to be absolutely leak proof with respect to the 3He gas.
Databáze:	OpenAIRE
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