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wiki:design_construction [2022/02/02 17:31] henri.godfrin@neel.cnrs.fr |
wiki:design_construction [2022/12/15 17:46] henri.godfrin@neel.cnrs.fr |
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* Small dilution refrigerators ("la Jolla" style) have diameters of a few cm, their 3He flow rate is ~10 to 50 µmol/sec. They are often used as " | * Small dilution refrigerators ("la Jolla" style) have diameters of a few cm, their 3He flow rate is ~10 to 50 µmol/sec. They are often used as " | ||
- | * Larger refrigerators with heat exchangers of typical diameters larger than 10 cm (" | + | * Larger refrigerators with heat exchangers of typical diameters larger than 10 cm (" |
* Cooling power at the MC is given by the simple expression | * Cooling power at the MC is given by the simple expression | ||
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* The still plays an important role: the **3He flow rate** of the dilution refrigerator, | * The still plays an important role: the **3He flow rate** of the dilution refrigerator, | ||
+ | |||
+ | ===== The Continuous heat exchanger | ||
+ | |||
+ | ===== The Step (" | ||
===== The Mixing Chamber | ===== The Mixing Chamber | ||
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- | ===== Troubleshooting ===== | + | ===== Troubleshooting |
* 1 K pot hot, pressure is low. Filling capillary blocked. Remove LHe so that the bath level is below the intake, keep 4He pressure in Pot above bath pressure. Having a heater on the 1K pot capillary can help, applying heat pulses... | * 1 K pot hot, pressure is low. Filling capillary blocked. Remove LHe so that the bath level is below the intake, keep 4He pressure in Pot above bath pressure. Having a heater on the 1K pot capillary can help, applying heat pulses... | ||