ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Accelerator Applications
The division was organized to promote the advancement of knowledge of the use of particle accelerator technologies for nuclear and other applications. It focuses on production of neutrons and other particles, utilization of these particles for scientific or industrial purposes, such as the production or destruction of radionuclides significant to energy, medicine, defense or other endeavors, as well as imaging and diagnostics.
Meeting Spotlight
2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
May 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
June 2024
Nuclear Technology
Fusion Science and Technology
Latest News
Securing the advanced reactor fleet
Physical protection accounts for a significant portion of a nuclear power plant’s operational costs. As the U.S. moves toward smaller and safer advanced reactors, similar protection strategies could prove cost prohibitive. For tomorrow’s small modular reactors and microreactors, security costs must remain appropriate to the size of the reactor for economical operation.
Reinhard Uhlemann, Jef Ongena
Fusion Science and Technology | Volume 35 | Number 1 | January 1999 | Pages 42-53
Technical Paper | doi.org/10.13182/FST99-A76
Articles are hosted by Taylor and Francis Online.
The neutral beam injectors of the tokamak experiment TEXTOR produce neutral particle beams in the megawatt range at 55 keV and up to a 10-s pulse length of the light atoms hydrogen, deuterium, 3He, and 4He for heating the fusion plasma of TEXTOR. The two injectors are equipped with one 5-MW ion source (plug-in neutral injector) each. The injected power of ~1.5 MW of each injector can be varied from 0 to 100% by opening the main beam target vertical aperture in steps of ~2 cm to the full opening of 50 cm. The symmetric truncation of the neutral beam profile at a target position 4.5 m from the ion source leads to no major deformation of the profile downstream at the entrance into the torus plasma at a 6-m distance from the ion source. Whereas usually the particle energy, i.e., acceleration voltage, and beam current or, alternatively, the gas pressure in the neutralizer at fixed energy must be varied to change the injected power, these beam parameters can be kept constant with the reported method to study the effect of different injected neutral beam powers on the fusion plasma. The transmitted power to the torus is detected by the calorimetrically measured remaining power on the beam target. The resulting transmitted neutral beam power as a function of the target aperture is in good agreement with the expected integral of the thus-truncated Gaussianlike beam profile, i.e., the error function. The scaling of the resulting injected neutral beam power, beam profiles, vertical full-width-at-half-maximum, and central power density with variation of the beam target aperture are in good agreement with the beamline simulation code PADET.