Nav: Home

BEPCII luminosity sets world record as 1×10^33/cm^2/s

April 14, 2016

At 22:29 pm, April 5th, the luminosity of the Beijing Electron Positron Collider (BEPCII) reached 1×1033cm-2s-1, a new landmark in the performance of the BEPCII-- 100 times better than before it was upgraded. This is also the highest luminosity yet achieved for such an accelerator in this energy region.

After recovering from some faults in its hardware system and beginning high energy data taking at the BESIII detector earlier this year, BEPCII has been running in a quite good condition. From March 25th, scientists and technicians from the Institute of High Energy Physics (IHEP) started a new run of machine study at BEPCII. After commissioning of the luminosity day and night, they finally achieved this major breakthrough on April 5th.

BEPCII is a double-ring e-e+ collider running at the tau-charm energy region (Ecm = 2.0-4.6 GeV), which, with a design luminosity of 1 × 1033 cm-2s-1 at the beam energy of 1.89 GeV, is an improvement of a factor of 100 over its successful predecessor, BEPC.

The installation of BEPCII was completed in the summer of 2005. The collider consists of two 237.5 m storage rings, one for electrons and one for positrons. They collide at the interaction point with a horizontal crossing angle of 11 mrad and a bunch spacing of 6 ~ 8 ns. Each ring can accommodate up to 120 bunches with a beam current of 910 mA. The machine will also provide a high flux and brightness of synchrotron radiation at a beam energy of 2.5 GeV with the dedicated synchrotron radiation mode.

In July 2008, the first collisions took place at BEPCII, and were observed by the new BESIII detector.

BEPCII passed the National Acceptance & Test organized by the National Development and Reform Commission in July 2009 , marking the successful completion of the Upgrade on schedule.

During the past years, the luminosity of the BEPCII was increased from 5.21×1032cm-2s-1 in 2010, 6.49×1032cm-2s-1 in 2011, 7.08×1032cm-2s-1 in 2013 and 8.53×1032cm -2s-1 in 2014.

The commissioning is still continuing, and we expect that more exciting news from BEPCII is still to come.

Chinese Academy of Sciences Headquarters

Related Performance Articles:

Managing stress helps transistor performance
A research team in China have developed a new CESL method that introduces tensile stress into both the channel and the drift region, improving overall performance by offering low drift resistance, high cut-off frequency and desirable breakdown characteristics.
Firms using new reporting method to 'greenwash' performance
New research suggests that some firms manipulate the content and tone of their company reports despite an initiative to make them more concise and balanced.
The influence of stimulants on performance when playing chess
High-performance tournament chess players can actually enhance the highly complex cognitive functions they require by taking substances such as the CNS stimulant methylphenidate or the wakefulness promoter modafinil and thus win more chess matches -- unless they are under time pressure.
Top professional performance through psychopathy
The term 'psychopath' is not flattering: such people are considered cold, manipulative, do not feel any remorse and seek thrills without any fear -- and all that at other's expense.
Keeping antennas at peak performance
KAUST shows the detection of partial faults in antenna array systems could prevent surreptitious performance degradation in wireless networks.
An ordered route to improved performance
KAUST shows a solvate created during the fabrication of perovskite thin films holds the key to reproducibly producing cheap solar cells.
Gestational age may impact academic performance
A new study published in the International Journal of Epidemiology indicates that being born either too early or too late may have a long-term effect on children's academic performance.
Study links athletic performance to mortality
New University of Arizona research suggests that athletes perform better when reminded of something a bit grim: their impending death.
Eating your greens could enhance sport performance
Nitrate supplementation in conjunction with Sprint Interval Training in low oxygen conditions could enhance sport performance a study has found.
People estimate their own abilities based on others' performance
Ratings of our own abilities are strongly influenced by the performance of others, according to a study published July 20 in Neuron.

Related Performance Reading:

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Do animals grieve? Do they have language or consciousness? For a long time, scientists resisted the urge to look for human qualities in animals. This hour, TED speakers explore how that is changing. Guests include biological anthropologist Barbara King, dolphin researcher Denise Herzing, primatologist Frans de Waal, and ecologist Carl Safina.
Now Playing: Science for the People

#SB2 2019 Science Birthday Minisode: Mary Golda Ross
Our second annual Science Birthday is here, and this year we celebrate the wonderful Mary Golda Ross, born 9 August 1908. She died in 2008 at age 99, but left a lasting mark on the science of rocketry and space exploration as an early woman in engineering, and one of the first Native Americans in engineering. Join Rachelle and Bethany for this very special birthday minisode celebrating Mary and her achievements. Thanks to our Patreons who make this show possible! Read more about Mary G. Ross: Interview with Mary Ross on Lash Publications International, by Laurel Sheppard Meet Mary Golda...