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We present a simple, reliable, and no-destructive method for the measurementof vacuum pressure in a magneto-optical trap. The vacuum pressure is verifiedto be proportional to collision rate constant between cold atoms and backgroundgas with a coefficient k, which can be calculated by simple ideal gas law. Therate constant for loss due to collisions with all background gases can bederived from the total collision loss rate by a series of loading curve of coldatoms under different trapping laser intensities. The presented method is alsoapplicable for other cold atom systems and meets the miniaturizationrequirement of commercial applications.

A simple, reliable, and no-destructive method for the measurement of vacuum pressure