180 research outputs found
Magnetic and mechanical analysis of Bi-2212 Rutherford cable in a cos-theta sub-scale dipole coil*
No full textFEM Analysis of Hybrid LTS/HTS Cos-theta Dipole Magnet with Heterogeneous Cable Model
No full textThe Lawrence Berkeley National Laboratory (LBNL) and the National High Magnetic Field Laboratory (NHMFL) have published results on Bi-2212 superconductive magnets realized and tested in the canted cosine-theta and solenoid designs, respectively. Fermilab is now preparing for the assembly of the first Bi-2212 stress-managed cosine-theta insert magnet. The insert will be part of the first hybrid cosine-theta magnet made of Nb3Sn outer layers within the US-MDP effort to reach a 20 T bore field. This paper presents the analytical analysis of the cosine-theta Nb3 Sn/Bi-2212 hybrid magnet. We report the parameters, logic, and implementation method of the 2D electromagnetic and mechanical FEM analysis of the LTS/HTS hybrid magnet. Results from a detailed heterogeneous model are compared to the homogeneous model implemented in the past. A Python code has been developed to simulate the current degradation due to stresses in the detail-modeled conductor areas. The current degradation has been introduced in the simulation dynamics for the HTS conductor as an iteration process, updating the input load of Lorentz forces of the energization at each step. The magnetic and mechanical analysis results of the 2D cosine-theta LTS/HTS dipole magnet have been described and analyzed
Special olympics movement for persons with intellectual disabilities
No full textThe educational and methodical complex is developed and made for methodical maintenance of the guided organized auditory and independent educational work of students on development of discipline "Special olympics movement for persons with intellectual disabilities" in volume of requirements of the educational standard and the curriculum for foreign students of the specialty 1-08 80 04 Physical culture and sport (a profile "Pedagogical activity in improving and adaptive physical culture")
Design and fabrication of a single-aperture 11 T Nb 3Sn dipole model for LHC upgrades
No full textThe planned upgrade of the LHC collimation system includes additional collimators to be installed in the dispersion suppressor areas of points 2, 3 and 7. To provide the necessary longitudinal space for the collimators, a replacement of 8.33 T Nb-Ti LHC main dipoles with 11 T dipoles based on Nb 3Sn superconductor compatible with the LHC lattice and main systems is being considered. To demonstrate this possibility FNAL and CERN have started a joint program to develop a 2 m long single-aperture dipole magnet with the nominal field of 11 T at ∼11.85 kA current and 60 mm bore. This paper describes the demonstrator magnet magnetic and mechanical designs and analysis, coil fabrication procedure. The Nb 3Sn strand and cable parameters and test results are also reported
Design of 11 T Twin-Aperture NbSn Dipole Demonstrator Magnet for LHC Upgrades
No full textThe LHC collimation upgrade foresees two additional collimators installed in the dispersion suppressor regions of points 2, 3 and 7. To obtain the necessary longitudinal space for the collimators, a solution based on an 11 T dipole as replacement of the 8.33 T LHC main dipoles is being considered. CERN and FNAL have started a joint development program to demonstrate the feasibility of NbSn technology for this purpose. The program started with the development and test of a 2-m-long single-aperture demonstrator magnet. The goal of the second phase is the design and construction of a series of 2-m-long twin-aperture demonstrator magnets with a nominal field of 11 T at 11.85 kA current. This paper describes the electromagnetic design and gives a forecast of the field quality including saturation of the iron yoke and persistent-current effects in the NbSn coils. The mechanical design concepts based on separate collared coils, assembled in a vertically split iron yoke are also discussed
Quench Performance of a 1 m Long Single-Aperture 11 T NbSn Dipole Model for LHC Upgrades
No full textFNAL and CERN are performing a joint R&D program with the goal to build a 5.5-m long twin-aperture 11 T NbSn dipole prototype suitable for installation in the LHC. An important part of the program is the development and test of a series of short single-aperture and twin-aperture models with a nominal field of 11 T at the LHC nominal current of 11.85 kA and 20% margin. This paper describes design features and test results of a 1 m long single-aperture NbSn dipole model fabricated and tested at FNAL
PRELIMINARY LIGHT AND SCANNING ELECTRON MICROSCOPE OBSERVATIONS OF MARINE FOSSIL<i>EUNOTIA</i>SPECIES WITH COMMENTS ON THE EVOLUTION OF THE GENUS<i>EUNOTIA</i>
No full textQuench Protection Study of a Single-Aperture 11 T Nb3Sn Demonstrator Dipole for LHC Upgrades
No full textThe planned upgrade of the Large Hadron Collider (LHC) collimation system will include installation of additional collimators in the dispersion suppressor areas. The longitudinal space for the collimators could be provided by replacing 15-m-long 8.33 T NbTi LHC main dipoles with shorter 11 T Nb 3Sn dipoles compatible with the LHC lattice and main systems. FNAL and CERN have started a joint program with the goal of building a 5.5-m-long twin-aperture Nb3Sn dipole prototype suitable for installation in the LHC. The first step of this program is the development of a 2-m-long single-aperture demonstrator dipole with a nominal field of 11 T at the LHC nominal current of 11.85 kA. This paper summarizes the results of quench protection studies of 11 T dipoles performed using the single-aperture Nb 3Sn demonstrator
The effects of various environmental factors on the success of tristylous Lythrum salicaria.
No full textInvasive species can influence a community, causing a decline or even extinction of native species. Lythrum salicaria, or purple loosestrife, is an exotic, tristylous plant that spreads over disturbed wetland areas in eastern North America. Rapid proliferation of this invasive demands a thorough understanding of the conditions in which it thrives most efficiently. In this study, I examined which environmental factors cause purple loosestrife to reproduce asexually versus sexually, and which soil conditions, sandy vs. organic, and dry vs. saturated, it prefers. I also explored factors that affect herbivory. My results showed that the three morphs were distributed in the expected, 1:1:1, ratio in high invasion levels, but not in low invasion levels. Purple loosestrife was more than three times as desnse in saturated, organic soil as it was in a dry or damp, mixed soil type. There was a greater average number of inflorescences per stem in highly invaded sites, and this average increased with an increase in plant height. As the number of adults increased, the number of seedlings also increased. Nearest neighbor values indicated greater proportion of same-morph pairs than expected. At high invasion levels, the porportion of herbivory was almost triple the proportion found in low invasion sites. Also, there was a strong correlation of increasing average plant height as well as increasing soil moisture with the proportion of herbivory. Overall, successful propagation of purple loosestrife seemed greatest in saturated, organic soils and in high density populations.http://deepblue.lib.umich.edu/bitstream/2027.42/54946/1/3387.pdfDescription of 3387.pdf : Access restricted to on-site users at the U-M Biological Station
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