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Related Concept Videos

Accelerators01:17

Accelerators

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Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
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Average Acceleration01:30

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The importance of understanding acceleration spans our day-to-day experiences, as well as the vast reaches of outer space and the tiny world of subatomic physics. In everyday conversation, to accelerate means to speed up. For instance, we are familiar with the acceleration of our car; the harder we apply our foot to the gas pedal, the faster we accelerate. The greater the acceleration, the greater the change in velocity over a given time. Acceleration is widely seen in experimental physics. In...
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Acceleration is in the direction of the change in velocity, but it is not always in the direction of motion. When an object slows down, its acceleration is opposite to the direction of its motion. Although commonly referred to as deceleration, this causes confusion in our analysis as deceleration is not a vector, and does not point to a specific direction with respect to a coordinate system. Therefore, the term deceleration is not used. For example, when a subway train slows down, it...
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Accelerating Fluids01:17

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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
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Electron Carriers01:24

Electron Carriers

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Related Experiment Video

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Segmented Terahertz Electron Accelerator and Manipulator (STEAM).

Dongfang Zhang1,2, Arya Fallahi1, Michael Hemmer1

  • 1Center for Free-Electron Laser Science, Deutsches Elektronen Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany.

Nature Photonics
|June 9, 2018
PubMed
Summary
This summary is machine-generated.

A novel segmented terahertz electron accelerator and manipulator (STEAM) offers enhanced electron bunch manipulation. This terahertz-driven device enables ultrafast imaging and spectroscopy with unprecedented resolution and compactness.

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Area of Science:

  • Physics
  • Ultrafast Science
  • Accelerator Technology

Background:

  • Electron acceleration and manipulation are fundamental to electron and X-ray devices for ultrafast imaging and spectroscopy.
  • Conventional radio-frequency devices face limitations in field strengths, gradients, synchronization, and compactness.

Purpose of the Study:

  • To introduce a novel segmented terahertz electron accelerator and manipulator (STEAM) device.
  • To demonstrate the capability of STEAM for multiple high-field operations on electron bunches.
  • To showcase the potential of terahertz-driven technology for advanced electron beam manipulation.

Main Methods:

  • Development and implementation of a segmented terahertz electron accelerator and manipulator (STEAM).
  • Utilizing few-micro-Joule, single-cycle, 0.3 THz pulses for device operation.
  • Demonstrating various high-field operations including acceleration, streaking, focusing, and compression.

Main Results:

  • Achieved record terahertz-acceleration of over 30 keV.
  • Demonstrated streaking with sub-10 femtosecond resolution.
  • Showcased focusing with over 2 kT/m strength and compression to approximately 100 femtoseconds.
  • Exhibited real-time switching between different operational modes.

Conclusions:

  • The STEAM device validates the feasibility of terahertz-based electron accelerators, manipulators, and diagnostic tools.
  • This technology enables scientific exploration beyond current resolution limits.
  • Terahertz-driven electron beam manipulation offers transformative potential for ultrafast science.