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Understanding electron beam halos

Jefferson lab physicist aims to develop large dynamic range diagnostics for electron linacs

by Christine Herman (FNAL)

The halo of an electron beam does not make it angelic. It only adds to the beam's messy profile, making more work for physicists like Jefferson Lab’s Pavel Evtushenko, who was recently awarded funding for five years to look into developing high-range dynamics beam diagnostics that could help clean up electron beams.

Feature

The pursuit of polarised positrons

The sixth POSIPOL workshop held at IHEP, Beijing

by Min Zhang

Researchers gather in Beijing to discuss the latest and future research on positron sources for a next-generation linear collider at this year’s POSIPOL workshop.

Director's Corner

Celebrating the Tevatron

by Barry Barish

The Fermilab Tevatron will be turned off later this month after having served the high-energy community for 25 years as the highest-energy collider in the world. The contributions of the Tevatron have been enormous, both from its many physics results and from its leading role in developing the science and technology of high-energy hadron colliders.

Image of the week

Super scientists stand symmetrically

Image: Reidar Hahn

Participants in the SUSY 2011 conference held from 28 August to 3 September at Fermilab.

In the News

  • from New Scientist
    7 September 2011
    Third experiment sees hints of dark matter
    The new result comes from an experiment called CRESST II which uses a few dozen supercooled calcium tungstate crystals to hunt for dark matter from deep beneath the Gran Sasso mountain in Italy.
  • from BBC News
    7 September 2011
    Dark matter hinted at again at Cresst experiment
    Researchers at the Cresst experiment in Italy say they have spotted 67 events in their detectors that may be caused by dark matter particles called Wimps.
  • from NPR
    6 September 2011
    A Final Smash For America’s Giant Particle Collider
    The Tevatron has been the pride of the Fermi National Accelerator Laboratory for a quarter of a century. But at the end of this month the Tevatron is shutting down.
  • from New Scientist
    6 September 2011
    Antimatter surplus is not dark matter’s smoking gun
    Antimatter enthusiasts will love it; dark matter hunters not so much. NASA’s FERMI satellite has confirmed a previous hint that there is more antimatter than expected coming from space. The bad news is that the result almost certainly rules out dark matter as the source.
  • from Reuters
    5 September 2011
    Month-end target mooted for finding “no Higgs”
    U.S.-based physicists said on Monday they hope to have enough data by the end of this month to establish if the elusive Higgs boson a particle thought to have made the universe possible exists in its long-predicted form.
  • from SLAC
    31 August 2011
    A PEP City Farewell
    Branded “temporary” when they were built in 1966 and threatened with demolition more than once during the past 35 years the dozen portable classroom buildings and office trailers known as “PEP City” are being torn down this week.
  • from msnbc.com
    31 August 2011
    Atom smashing hype faces reality
    The latest results from the Large Hadron Collider serve as a reality check for expectations that radical scientific discoveries are just around the corner.
  • from National Geographic
    31 August 2011
    Dark Matter Is an Illusion New Antigravity Theory Says
    The mysterious substance known as dark matter may actually be an illusion created by gravitational interactions between short-lived particles of matter and antimatter a new study says.