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Related Concept Videos

Hydraulic Jump: Problem Solving01:16

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To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
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A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
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Ramsey Spectroscopy with Displaced Frequency Jumps.

M Shuker1,2, J W Pollock1,2, R Boudot1,3

  • 1National Institute of Standards and Technology, Boulder, Colorado 80305, USA.

Physical Review Letters
|April 6, 2019
PubMed
Summary
This summary is machine-generated.

A new displaced frequency-jump Ramsey (DFJR) method simplifies atomic clock operation. This technique significantly reduces sensitivity to light shifts in cold-atom microwave clocks.

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Area of Science:

  • Atomic physics
  • Metrology
  • Spectroscopy

Background:

  • Advanced Ramsey-based protocols aim to improve atomic clock precision by minimizing frequency shifts.
  • Coherent Population Trapping (CPT) is a key technique in cold-atom microwave clocks.

Purpose of the Study:

  • To propose a simplified alternative to autobalanced Ramsey interrogation protocols.
  • To demonstrate the application of this new method to a CPT cold-atom microwave clock.

Main Methods:

  • The proposed method uses two consecutive Ramsey sequences with varying dark periods.
  • Frequency jumps are precisely controlled by a displacement parameter, inversely proportional to the dark period.
  • The local oscillator frequency serves as a single control variable for servo loops.

Main Results:

  • The displaced frequency-jump Ramsey (DFJR) scheme simplifies implementation by using a single physical variable (LO frequency).
  • DFJR avoids noise associated with LO phase control.
  • Testing on a CPT cold-atom clock showed over an order of magnitude reduction in light shift sensitivity compared to standard Ramsey interrogation.

Conclusions:

  • The DFJR method offers a simpler and more robust approach to Ramsey spectroscopy.
  • This technique enhances the stability and precision of atomic clocks.
  • The DFJR method is applicable to various Ramsey-spectroscopy applications, including frequency metrology and precision spectroscopy.