Conveners
Thu-Af-Or23 - Magnets for NMR and Medical Applications
- Iain Dixon (NHMFL)
- Seungyong Hahn (Seoul National University)
We are developing a tabletop 1-GHz microcoil nuclear magnetic resonance (NMR) spectrometer of compact, low-cost, and small-footprint features while having better peak resolution and sensitivity than conventional lower field NMR spectrometers, enabled by the high-temperature superconducting (HTS) REBCO no-insulation (NI) magnet. In this paper we present construction and test results of a...
Abstract:
We have been developing a compact 1 GHz (23.5 T)-class LTS/HTS NMR magnet. There were two options of HTS inner coils, i.e. Bi-2223 or REBCO, and we decided to employ the Ni alloy-reinforced Bi-2223 conductors for the inner coils considering a smaller screening current-induced magnetic field of a Bi-2223 coil and its lower risk of unexpected degradation under high fields. The...
Since 2014, an R&D program has been conducted to design, construct, and operate a 400 MHz 66 mm room-temperature bore all-REBCO magnet for high resolution NMR application. It is a collaborative program led by the Korea Basic Science Institute (KBSI) in participation of the Korea Institute of Machinery and Materials, Kunsan National University, National High Magnetic Field Laboratory, Seoul...
With the increase of the magnetic field of NMR, the traditional LTS materials cannot meet the requirements of ultrahigh field NMR magnet design. In recent years, with the development of high-temperature superconducting tapes (especially ReBCO tapes), hybrid magnets with HTS magnets as interpolating magnets have become an important choice for designing ultrahigh field NMR magnets....
We are developing a superconducting isochronous cyclotron for proton therapy. Its yoke weight is about 65 tons, which is less than one third of our normal-conducting 230 MeV cyclotron.The sprit pair superconducting coils using NbTi wire are conduction-cooled by four 4 K Gifford-McMahon cryocoolers. Pure iron magnetic poles have deep valleys and four sectors with higher spiral angles than 60...
A curved superconducting magnet for proton therapy was built and tested by the Superconducting Magnet Group at Lawrence Berkeley National Laboratory (LBNL). This magnet consists of two Canted-Cosine-Theta (CCT) dipole layers with a clear bore diameter of 290 mm, bend radius of 0.9 m, and magnetic bend angle of 50 degrees. The magnet design will be discussed in the context of a reduced bend...
Hadron and proton therapy are cutting edge techniques for cancer treatment and a great development of specialized medical centers and research facilities is foreseen in the next decades. One of the main obstacles to the penetration of the use of charged particles for therapy is the construction of complex and expensive accelerating structures and rotating transfer lines, i.e. gantries, able to...
Provided that a cyclotron system requires DC magnetic field, the no-insulation (NI) HTS magnet may be a good candidate as it may enable the cyclotron magnet to be more compact and reliable, yet generate a substantially higher magnetic field than its insulated counterpart. Here we report on a design study of a NI HTS cyclotron magnet for acceleration of carbon ions under isochronous condition...
