Sentences with phrase «electron pulses»

Short electron pulses are, however, difficult to generate, because electrons carry a charge and move more slowly than the speed of light.

To date, microwave technology has been used to control electron pulses.

The extremely brief electron pulses ensure that the image remains sharp, much like a short - exposure photograph of a speeding object.

In particular, electron pulse technology still has a long way to go to achieve the temporal resolution required to capture the motions of electrons inside a material.

A second point was the finding that textures can be written with much lower beam intensity using tightly focused electron pulses.

These feature make ultrashort electron pulse trains an ideal tool with which to monitor, in real time, the ultrafast processes initiated by the impact of light oscillations onto matter.

Electron pulses with durations in the femtosecond to attosecond range (10-15-10-18 s) would be ideal for monitoring processes inside matter with the required resolution in both space and time, i.e. in four dimensions.

At near - light speed and very high energies, the intense electron pulses entered a photon tunnel containing a 210 m long stretch of X-ray generating devices.

By tuning electron pulses and recording those electrons that went through to the other side, the researchers were able to map the energy and momentum of electrons within the material.

Now, a team headed by Dr. Peter Baum and Prof. Ferenc Krausz from the Laboratory for Attosecond Physics (LAP), LMU and the Max - Planck Institute of Quantum Optics (MPQ) has succeeded in developing a new technique for controlling ultrafast electron pulses.

«Pulses of electrons manipulate nanomagnets and store information: Scientists use electron pulses to create and manipulate nanoscale magnetic excitations that can store data.»

Here we show that tailored electron pulses can swiftly write, erase or switch topologically protected magnetic textures such as skyrmions.»

These electron guns are designed to produce a chain of high - energy electron pulses that are accelerated and then forced by powerful magnetic fields to give up some of their energy in the form of X-ray light.

By using trains of extremely short electron pulses, Peter Baum and Yuya Morimoto have obtained time - resolved diffraction patterns from crystalline samples.

«The work shows how magnetization of nanoscale magnets can be steered by intense ultrashort electron pulses,» said Alexander Schäffer, a doctoral student at Martin - Luther - Universität Halle - Wittenberg in Halle, Germany, and lead author of the paper.

For the purposes of microscopy, these electron pulse trains have one great advantage over sequences of attosecond optical pulses: They have a far shorter wavelength.

Frigid temperatures of 7 kelvin -LRB--266 °C) help this clunky forward motion by effectively freezing the wheels in place except when excited by the electron pulse and during their subsequent self - adjustment.

Hence, the physicists have created a virtual terahertz - stopwatch for the electron pulses.

With the aid of terahertz radiation, Munich physicists have developed a method for generating and controlling ultrashort electron pulses.

Furthermore, the researchers can actually determine how long the electron pulses are when they arrive at the sample position.

The new technology puts Baum and colleagues in a position to shorten the electron pulses even more.

Under these conditions, as the electron pulse continues to propagate, it is compressed, reaching a minimum duration at the location where it scatters from the material sample under study.

Using this technique, the team was able to reduce the length of the electron pulses significantly.

This involves forcing the electron pulses to interact a second time with terahertz radiation, but this time the terahertz electromagnetic fields are oriented such that they impart a sideways deflection to the electrons.

Electron microscopy and electron diffraction can provide the spatial resolution to image atoms, but filming atomic motions requires ultrashort shutter speeds — the shorter the electron pulses, the sharper the images from the microcosmos.

Then, when the electron pulse hits the sample, its electrons scatter in a pattern that provides a picture of the sample's atomic configuration as a function of the time.

Electron microscopy and electron diffraction can provide the spatial resolution to image atoms, but filming atomic motions requires ultrashort shutter speeds - the shorter the electron pulses, the sharper the images from the microcosmos.

Here, 17 290 permanent magnets with alternating poles interacted with the electron pulses from above and below.

In a 2.1 km long accelerator tunnel, the electron pulses were strongly accelerated and prepared for the later generation of X-ray laser light.

As the group reports this week in Applied Physics Letters, from AIP Publishing, the magnetization of these ensemble excitations, or quasiparticles, is controlled by tailoring the profile of the electron pulses, varying either the total number of electrons or their width in space.

The interaction compresses the duration of the electron pulses to a few femtoseconds.

An initial laser pulse will trigger a reaction in the sample that is followed an instant later by an electron pulse to produce an image of that reaction.

How it works: An initial laser pulse triggers a reaction in a sample that is followed an instant later by an electron pulse to produce an image.