Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Energy recovery experiment could lead way to new accelerators

24.04.2003


Jefferson Lab physicists will soon begin their own version of reuse — not with run-of-the-mill materials, but with radiofrequency energy and the high-energy electrons that they energize.




Newspaper, glass and aluminum recycling has become commonplace for most households and businesses. Jefferson Lab physicists will soon begin their own version of reuse -- not with run-of-the-mill materials, but with radiofrequency energy and the high-energy electrons that they energize.

In an experiment slated to commence the third week of March, the Jefferson Lab accelerator, with slightly modified hardware, will go from "ordinary CEBAF accelerator" to "novel test bed" for recirculating linacs with energy recovery. Dave Douglas, an accelerator physicist with the Lab’s Center for the Advanced Studies of Accelerators (CASA), and Andrew Hutton, the Accelerator Division’s Director of Operations, first proposed this groundbreaking experiment, which was actively promoted and supported by the Accelerator Division and Lab management and was approved in July 2002 by the Program Advisory Committee. The experiment requires a new magnetic chicane but few
other changes to the accelerator.



The point of the experiment is to test a way to dramatically reduce RF (radiofrequency) energy usage, thus saving power or alternatively for the same power usage, producing brighter and higher intensity beams. Researchers believe that demonstration of this technology with multiple cavities at billion electron volt energies will provide valuable lessons for the future.

If the results are what scientists hope for, any advances could be applied to future energy-recovery linacs, or ERLs. Existing machines, like JLab’s Free-Electron Laser, or FEL, could benefit, as well as planned next-generation devices at national laboratories and universities, such as ion colliders and advanced light sources.

"RF power is quite expensive and limited; one can only feed so much power through a klystron into radio-frequency [energy]. Energy recovery is the centerpiece of a new operation mode for recirculating linacs, where the high energy beam returns its energy for further acceleration of a ’fresh’ batch of electrons," explains Alex Bogacz, a staff scientist with CASA and co-spokesman of the experiment. "The idea is not so new. Essentially we will be using the available RF power twice. Rather than throwing out a ’hot’ beam of high-energy electrons, we will extract its energy for further usage, then safely dump it at a low energy. One can cut power consumption by a large factor."

There are two phases involved in the March experiment’s 12-day run, involving proof-of-concept beam acceleration and deceleration at modest energies, in the range of several hundred million electron volts, or MeV (normally, the Lab’s accelerator operates in the six billion electron volt, or 6 GeV range). A third phase has been planned but not yet scheduled. During this final phase -- current doubling -- the energy recovery scheme combined with simultaneous "coasting" beam (no acceleration), will result in the effective beam current being doubled -- a very attractive proposition for next generation, high-brilliance light sources.

By March, the modest hardware changes to the accelerator will be made; technicians will have installed a chicane (series of four magnets) in the south linac (SL 22/23 region) designed to provide the slight phase delay as the beams circulate and recirculate, as well as the stands to accommodate them. A relatively small beam-extraction device, known as a "beam dump" is also being built, so that the electron beam can be "parked" and examined once each phase is complete. In addition, dedicated optics for beam transport, instrumentation and vacuum chambers (the pipe that carries the beam) are being readied.

None of the new components will impede or interfere with any previously installed equipment, and will remain in place once this energy-recycling study concludes.

During the experiment, JLab scientists will be making meticulous measurements of beam properties -- among them, energy, current, emittance (beam size) and "halo" (stray particles traveling with the beam) -- to insure their beam quality remains high. To that end, they will be monitoring the experiment’s dedicated optics to determine what, if any, factors degrade performance.

"The big question is how this will affect the quality of the beam," Bogacz says. "In principle, beam quality should be preserved and there should be no emittance dilution. That’s what we’ll be hoping to find when we take measurements of the beam that we extract at the beam dump."

In any case, if the March study pans out, Bogacz believes energy-recovery techniques may lead to an entirely new class of accelerators. "This is the next evolutionary step," he contends. "We’re trying to run smarter and use the accelerator’s innate capabilities. We think if we’re successful, this will be very useful for the next generation of light sources and precision colliders."

For more information regarding the Energy Recovery Experiment, visit the Center for Advanced Studies of Accelerators (CASA) website.

Linda Ware | EurekAlert!
Further information:
http://www.jlab.org/

More articles from Physics and Astronomy:

nachricht Will Earth still exist 5 billion years from now?
08.12.2016 | KU Leuven

nachricht Home computers discover a record-breaking pulsar-neutron star system
08.12.2016 | Max-Planck-Institut für Radioastronomie

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Scientists track chemical and structural evolution of catalytic nanoparticles in 3-D

08.12.2016 | Materials Sciences

Decoding cement's shape promises greener concrete

08.12.2016 | Materials Sciences

Will Earth still exist 5 billion years from now?

08.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>