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a): the percentage losses as a function of the temperature difference between T exc and T ch . b): The measured power (in red) and the power applied to the electrical heater (in black) are shown as a function of the time. The yellow line corresponds to the fit function done by using the eq.2, performed both on the set and on the measured power. The green line corresponds to the error band of 0.2% on the measured power. In the inset the difference between the applied and the measured power during the time is shown.
Source publication
A thermal calorimetric apparatus was designed, built and calibrated for measuring the activity of the artificial ¹⁴⁴ Ce — ¹⁴⁴ Pr antineutrino source. This measurement will be performed at the Laboratori Nazionali del Gran Sasso in Italy, just before the source insertion in the tunnel under the Borexino detector and a precision better than 1% is req...
Contexts in source publication
Context 1
... losses were studied by varying the parameters of the system as the mass flow or the temperature of the vacuum chamber T ch with respect to the copper heat exchanger T exc , for different set powers. As it results from the plot shown in Fig.2a) the losses are influenced mainly by the difference T exc − T ch and they are always lower than 0.4% even in the case when T exc − T ch ∼ 16 • C, but it can be close to zero if T exc − T ch < 8 • C. It is worth noting that the massflow value directly influences the T out and T exc temperature and thus it has to be chosen accordingly to the set power in order to obtain a T out value around 40 • C, in such a way that T ch can be set around 30 • C. Since the losses are induced by the temperature distribution, the massflow can be increased for higher power without increasing the total losses and by comparing measurement at different powers and different massflows it can be concluded that a massflow value close to 12 g/s has to be chosen if the power released by the source is expected to be 1200 W. The losses were estimated also with a pressure of the order of 10 −3 mbar (instead of 10 −5 mbar) achieved by switching off the turbo molecular pump. ...
Context 2
... Fig.2b) the measured power is shown as a function of the time and the transient phase of 3 days is however visible, after which the system reaches the final phase where the measured power behavior follows the negative exponential function as well. ...
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