The High Energy Photon Source (HEPS), a greenfield high-energy, ultralow-emittance synchrotron facility, is under construction in Beijing by the Institute of High Energy Physics, Chinese Academy of Sciences. HEPS can accommodate ~90 beamlines. To make full use of HEPS as soon as possible and to meet demand from diverse users, we are now soliciting proposals for Phase II candidate beamlines for HEPS.
A group of researchers from CSNS recently finished a beam chopping test of the Fermi neutron chopper prototype. The chopper worked accurately producing several expected monochromatic energy neutron beams, marking its successful development as China’s first Fermi neutron chopper prototype.
A fly-scan experiment on standard samples was successfully conducted by the High Energy Photon Source (HEPS) Beam Instrumentation and Control Division’s beamline control system in cooperation with the Beijing Synchrotron Radiation Facility (BSRF) 4W1B Station on April 15. Based on more than a year’s technical development and iterative optimization, the experimental results show that the newly developed fly-scan experimental system helped reduce the scan rate/speed at the 4W1B endstation from hours to minutes per sample. In addition, experimental efficiency was improved more than an order of magnitude. The data collection process and the result of the fly-scan experiment have been approved by the 4W1B endstation. The fly-scan experimental system will be opened to users soon.
Researchers from the Institute of High Energy Physics of the Chinese Academy of Sciences examined the validity of the theory of relativity with the highest accuracy in a study entitled “Exploring Lorentz Invariance Violation from Ultrahigh-Energy γRays Observed by LHAASO,” which was published in the latest issue of Physics Review Letter. According to Einstein's theory of relativity, the fastest speed of matter in the Universe is the speed of light. Whether that limit is breachable can be tested by examining Lorentz symmetry breaking or Lorentz invariance violation.
The 19th International Collaboration Meeting of the Jiangmen Underground Neutrino Observatory (JUNO) was held online from January 17 to 28. The meeting consisted of three plenary sessions, 31 parallel sessions and technical reviews. About 210 scientists from Asia, Europe, and the Americas attended. Prof. WANG Yifang, JUNO spokesperson and director of IHEP, summarized progress on the project at the plenary session. He said onsite detector installation began in December just as long-delayed civil construction was almost completed. This year will be crucial for construction of the detector since all kinds of difficulties and challenges remain. He said everyone involved will work together to complete the challenging task on schedule.
The BESIII collaboration has presented measurements of the neutron's electromagnetic (EM) structure in the time-like region with unprecedented precision. The new BESIII results clarify the photon–nucleon interaction puzzle that has persisted for over 20 years, and a surprising periodic structure has been observed for the nucleon effective form factors. The manuscript is featured on the cover of the Nov. 8 issue of Nature Physics. As an uncharged particle, the neutron resists many types of measurement. Ninety years after its discovery there are still many unanswered questions, in particular concerning its size and lifetime. The neutron consists of three quarks that whirl around inside it and are held together by gluons. Physicists use EM form factors (EMFFs) to describe this dynamic inner structure of the neutron. These FFs represent an average distribution of electric charge and magnetization within the neutron and can be determined by means of
The CSNS accelerator successfully completed its 2021 summer maintenance and began a new round of machine study on Sept. 15. Maintaining the accelerator with a tight schedule has always been a big challenge. The main tasks for this year were to install a new RF type ion source and finish commissioning, on-site replace the No. 12 drift tube of DTL-1, install the 16 RCS correction quadrupole magnets and 16 AC sextupole magnets as well as their power supplies, and refurbish the RCS injection area. Nevertheless, these extensive tasks were finished as planned, which helped pave the way for subsequent beam commissioning and increasing the beam power.
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