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Dependence of in-situ Bose condensate size on final frequency of RF-field in evaporative cooling

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Abstract

We report the results of in-situ characterization of 87Rb atom cloud in a quadrupole Ioffe configuration (QUIC) magnetic trap after a radio-frequency (RF) evaporative cooling of the trapped atom cloud. The in-situ absorption images of the atom cloud have shown clear bimodal optical density (OD) profiles which indicate the Bose–Einstein condensation (BEC) phase transition in the trapped gas. Also, we report here, for the first time, the measured variation in the sizes of the condensate and thermal clouds with the final frequency selected in the frequency scan of the RF-field for evaporative cooling. These results on frequency-dependent sizes of the clouds are consistent with the theoretical understanding of the BEC phenomenon in the trap.

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Acknowledgement

The authors would like to thank V B Tiwari, S Singh, V Singh, A Srivastava and A Chakraborty for their help in the experiments. They are also thankful to V Bhanage, P P Deshpande, S Tiwari, L Jain and A Pathak for developing the controller system, C Rajan and P Kumar for developing the switching circuitry, M Lad and P S Bagduwal for providing the RF amplifier, H S Vora for image processing software, K V A N P S Kumar and S K Shukla for help in the vacuum system.

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Authors and Affiliations

  1. Raja Ramanna Centre for Advanced Technology, Indore, 452 013, India

    S R MISHRA, S P RAM, S K TIWARI & H S RAWAT

  2. Homi Bhabha National Institute, Mumbai, 400 094, India

    S R MISHRA & H S RAWAT

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  1. S R MISHRA
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Correspondence to S R MISHRA.

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MISHRA, S.R., RAM, S.P., TIWARI, S.K. et al. Dependence of in-situ Bose condensate size on final frequency of RF-field in evaporative cooling. Pramana - J Phys 88, 59 (2017). https://doi.org/10.1007/s12043-017-1364-5

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  • DOI: https://doi.org/10.1007/s12043-017-1364-5

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