Current Science

S. De ¹, N. Batra ¹, S. Chakraborty ¹, S. Panja ¹, A. Sen Gupta ¹

Affiliations
1 CSIR-National Physical Laboratory, Dr K. S. Krishnan Marg, New Delhi 110 012, IN

Abstract

We present an ion trap design of end-cap geometry and numerically calculate its potential. An rf-resonator of quality factor 800(20) has been fabricated for delivering high voltage to the trap. An optical frequency standard will be developed by trapping and laser cooling a single ¹⁷¹Yb⁺. Optical arrangements for photoionization, laser cooling and detection are also described.

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Lakhi Sharma ¹, S. De ¹, P. Kandpal ², M. P. Olaniya ², S. Yadav ², T. Bhardwaj ², P. Thorat ², S. Panja ¹, P. Arora ¹, N. Sharma ², A. Agarwal ¹, T. D. Senguttuvan ¹, V. N. Ojha ¹, D. K. Aswal ¹

Affiliations
1 Academy of Scientific and Innovative Research (AcSIR), CSIR-NPL Campus, New Delhi 110 012, IN
2 CSIR-National Physical Laboratory (CSIR-NPL), Dr K. S. Krishnan Marg, New Delhi 110 012,, IN

Abstract

A strong demand of a separate time zone by northeast populace has been a matter of great debate for a very long period. However, no implementable solution to this genuine problem has yet been proposed. The CSIR-National Physical Laboratory, CSIR-NPL (the National Measurement Institute, NMI, o f India and custodian o f Indian Standard Time, IST) proposes an implementable solution that puts the country in two time zones: (i) IST-I (UTC + 5: 30 h, represented by longitude passing through 82 °33 E) covering the regions falling between longitude 68 °7 E and 89 °52 E and (ii) IST-II (UTC + 6: 30 h, represented by longitude passing through 97°30E) encompassing the regions between 89°52E and 97°25E. The proposed demarcation line between IST-I and IST-II, falling at longitude 89 °52 E, is derived from analyses o f synchronizing the circadian clocks to normal office hours (9: 00 a.m. to 5 : 30p.m.). This demarcation line passes through the border of West Bengal and Assam and has a narrow spatial extension, which makes it easier to implement from the railways point o f view. Once approved, the implementation would require establishment of a laboratory for ‘Primary Time Ensemble - I I ’ generating IST-II in any o f the north-eastern states, which would be equivalent to the existing ‘Primary Time Ensemble-I’ at CSIR-NPL, New Delhi.

Keywords

Circadian Clock, Energy Saving, Indian Standard Time, Longitude, Sun Graphs, Two Time Zone.

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