NSLS-II stores 25 milliamps of current

May 01, 2014 by Mona S. Rowe
Graph of NSLS-II storage-ring beam current (blue) peaking repeatedly at 25 mA between 4 and 9 a.m. on April 29, 2014

(Phys.org) —Early on April 29, 2014, the National Synchrotron Light Source II (NSLS-II) at the U.S. Department of Energy's Brookhaven National Laboratory stored 25 milliamps (mA) of current at 3 billion electron volts using a room-temperature radio-frequency (RF) cavity. This achievement is a key performance milestone and comes more than nine weeks ahead of schedule for the NSLS-II construction project. The project team is now planning to push ahead with installation of the superconducting RF cavity and additional insertion devices.

"This achievement was made possible by the hard work of our staff, the Laboratory, the Department of Energy, and our many colleagues who have helped to shepherd the project to this milestone," said Steve Dierker, Associate Laboratory Director for Photon Sciences. "Together we are looking forward to completion of the project and an exciting science program for our user community."

When completed, NSLS-II will be a state-of-the-art, medium-energy electron storage ring that produces x-rays up to 10,000 times brighter than the original NSLS, which started operating at Brookhaven Lab in 1982 and is shutting down at the end of September 2014.

NSLS-II construction began in 2009, with a $912-million budget from the U.S. Department of Energy Office of Science. Construction has passed through distinct phases, starting with conventional construction of the ring building and laboratory-office buildings; installation of the accelerator and beamlines; now commissioning of the injection system, which consists of a linear accelerator, the booster, transport lines and a storage ring; followed by commissioning of an initial suite of beamlines for early science.

Explore further: National Synchrotron Light Source II achieves first stored electron beam

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peter09
5 / 5 (1) May 01, 2014
Confused:

How do you store current? Current by itself is not a measure of energy and unless there is some resistance in the circuit there is no work..... Even V x I = Watts has a time component.
DonGateley
not rated yet May 01, 2014
Electrons going round and round in a vacuum ring inside an accelerator with an RF cavity.
DonGateley
not rated yet May 02, 2014
Or any charged particle. Electrons are the easiest.
EyeNStein
not rated yet May 02, 2014
Strictly it is CHARGE stored in the ring. But because it IS a ring the charge keeps flowing past as a current.
A single electron may well whizz by any measurement point numerous times per second and be added to the current measurement at each pass.
As the instrument is a synchrotron light source, current and acceleration potential energy are the most useful measurement parameters for their purposes: As the same electron will contribute additional photons for each pass of the bending points in the ring where photons are emitted.
dirk_bruere
not rated yet May 03, 2014
25mA is a useless measurement.
If it was 25mC it would be impressive