Field Measurements of Magnets for Modern SR Sources and FEL
Magnets for modern accelerators and storage rings may have a rather complex field distribution and strict quality requirements. The Budker Institute of Nuclear Physics (Novosibirsk, Russia) is a well-known producer of magnets for various accelerator projects worldwide. This paper describes our magnet measurement facility with examples of NSLS-II booster magnets, small-aperture X-FEL quadrupoles, and PETRA-III dipoles. NSLS-II booster dipoles have quadrupole and sextupole components with a rather high field quality of 1 · 10-3 in the good field region of ±2 cm, providing booster operation at energy from 170 MeV to 3.15 GeV with a 2-Hz repetition rate. We designed a special bench with a ceramic rotation coil to measure X-FEL quadrupoles. The equipment provided measurements of the magnetic axis with accuracy better than 5 μm. We used the system of three temperature-stabilized Hall sensor arrays distributed vertically to obtain a three-dimensional field map from a single measurement of PETRA-III dipole magnets.
Analysis of the Impact of Chinese Traditional Ceramic Sculpture on Modern Sculpture
In the evolution of civilization for thousands of years, ceramic sculpture has been existing and developing in an artistic form with nationalization. Modern ceramic sculpture is the product of modern social civilization. Its development can not be separated from modern advanced science and technology, the improvement of material living standards, and the higher requirements of people for aesthetic taste. With the continuous progress and development of ancient Chinese sculpture art, ceramic sculpture has produced remarkable achievements and positive far-reaching impact. Due to the language and morphological characteristics of modern ceramic sculpture, modern ceramic sculpture has incomparable artistic expression and touching artistic charm, which is a characteristic other arts do not have. Ceramic workers can do their best to explore and play, so that their ceramic sculpture works show unique pursuit, endow the works with vitality and achieve a new perfection.
Hobbes and the Reception of Leviathan
Although there has been much discussion of the reception of Hobbes’s work, Hobbes’s response to his own reception has rarely received much consideration. This article looks at Hobbes’s engagements with his critics. Far from being rearguard actions by a philosopher under siege, or disingenuous attempts to curry favour with those in power, they can be read as moments when Hobbes in fact sought to convert what he saw as the “truth of speculation into the utility of practice.”