Session TOB. There are 6 abstracts in this session.

Session: Instrumentation 1, time: 08:30am-08:50am

Superconductor Design Choices for a 1.4 GHz (32.9 T) High Resolution NMR Magnet

David Larbalestier1, 2; Mark Bird1, 2; Lance D Cooley1, 2; Timothy A. Cross1, 2; Lucio Frydman3; Eric E Hellstrom1, 2; Joanna R. Long4; W Scott Marshall1, 2; Ulf Trociewitz1, 2
1NHMFL-FSU, Tallahassee, FL; 2NHMFL-FSU, Tallahassee, FL; 3Weizmann Institute, Rehovot, N/A; 4University of Florida, Gainesville, FL
Progress towards >30 T NMR magnets shows many difficulties.  We have been developing Bi-2212 because it has high Jc, is round, isotropic, and multifilamentary, like the Nb-Ti and Nb3Sn of all present NMR magnets. By contrast to REBCO, where the 30 T irreversibility temperature Tirr is ~55 K, Tirr(30T) for 2212 is ~15 K, making the quench protection much easier. The Bi-2212 complication is to wind and then react it.  We believe it ready for large magnet projects, especially NMR and are now planning large coils to demonstrate fields in the 30 T range with safe mechanical and quench properties. Capitalizing on its multifilamentary, fine filament and macroscopically isotropic properties, we plan coils with sub ppm homogeneity and low drift.

Session: Instrumentation 1, time: 08:50am-09:10am

High-Power Solid-State Millimeter-Wave Sources to Enable Advanced EPR and DNP-NMR Measurements   

Eric Bryerton1; Steven Retzloff1; Melanie Rosay2; Ivan Sergeyev2; Fabien Aussenac3; Jeffrey Hesler1
1Virginia Diodes, Inc., Charlottesville, VA; 2Bruker BioSpin, Billerica, MA; 3Bruker Biospin, Wissembourg, N/A
DNP uses a high-power millimeter-wave source to irradiate electron spins and transfer high electron polarization to the nuclear spins, thereby enhancing the NMR signal. This fundamentally reduces the time required to acquire the desired data; making a much broader range of measurements feasible. The critical barrier to the greater use of DNP-NMR systems is the lack of sufficiently powerful and frequency agile solid-state sources. In this work, we have developed and demonstrated an electronically tunable multiplier-based solid-state source with 256 mW output power at 262 GHz. This source was used to measure DNP enhancements of 50 using a 3.2 mm sample diameter probe and 120 using a 1.3 mm diameter sample probe, both at 100 K sample temperature.

Session: Instrumentation 1, time: 09:10am-09:30am

Inductively-Coupled Microcoils and Solution Flow for Increased NMR Sensitivity

Patrick Berthault
CEA, Gif Sur Yvette, France
Several ways can be employed to increase the NMR sensitivity per time unit. Here we present a series of 3D-printed inserts installable on any commercial liquid NMR probehead. They contain a closed-loop circuit for the solution under study set in motion via a gas pushed by a programmable syringe pump. A part of the circuit contains a micro-solenoid. Induction between the commercial antenna and the microcoil is optimized viaa Vernier. Such systems lead to a significant gain in sensitivity per time unit for slowly relaxing nuclei while preserving the capabilities of the host probehead. They are perfectly compatible with the use of hyperpolarized species.


Session: Instrumentation 1, time: 09:30am-09:50am

Towards 1.3 GHz NMR: A Persistent 400 MHz NMR with Superconducting Joints for High-Temperature Superconductors

Toshio Yamazaki1; Yoshinori Yanagisawa1; Renzhong Piao1; Yu Suetomi1, 2; Kazama Yamagishi1, 3; Masato Takahashi1; Tomoaki Takao3; Kotaro Ohki4; Takashi Yamaguchi4; Tatsuoki Nagaishi4; Yasuyuki Miyoshi5; Masatoshi Yoshikawa5; Mamoru Hamada5; Kazuyoshi Saito5; Hitoshi Kitaguchi6; Ken-ichi Hachitani7; Yoshitaka Ishii1, 8; Hideaki Maeda9
1NMR Div., RSC, RIKEN, Yokohama, Japan; 2Chiba University, Chiba, Japan; 3Sophia University, Tokyo, Japan; 4Sumitomo Electric Industries, Osaka, Japan; 5Japan Superconductor Technology, Kobe, Japan; 6National Institute for Materials Science, Tsukuba, Japan; 7JEOL RESONANCE Inc., Akishima, Japan; 8Tokyo Institute of Technology, Yokohama, Japan; 9Japan Science and Technology Agency, Tokyo, Japan
This paper presents the world’s first persistent NMR equipped with superconducting joints between high-temperature superconductors (HTS). We have started a project to develop a 1.3 GHz NMR and the biggest technical challenge is to operate the magnet in the persistent mode. Such a magnet requires several tens of superconducting joints between HTSs and those between HTS and a low-temperature superconductor (LTS). Towards this goal, we demonstrate the persistent operation of a 400 MHz LTS/HTS NMR with superconducting joints for HTS The magnet provided a very stable magnetic field with a drift rate of +0.85 ppb/h without decay. We succeeded in obtaining high-resolution NMR spectra, including 3D HCCH-TOCSY for GB1 protein sample.

Session: Instrumentation 1, time: 09:50am-10:10am

Integrated Impedance Spectroscopy for Automated High Throughput MR Measurements on Fluidic Plugs

Omar Nassar; Mazin Jouda; Nan Wang; Michael Rapp; Jan Korvink; Dario Mager; Neil Mackinnon
Karlsruhe Institute of Technology, IMT, Eggenstein-Leopoldshafen, Germany
Microfluidic technologies combined with micro-NMR have become increasingly popular given their promise of increased sample throughput and mass-sensitivity. A capillary flow system featuring an integrated impedance spectroscopy sensor for sample position and flow rate measurement as well as a micro saddle coil for NMR spectroscopy is demonstrated. With this technology high-throughput, fully automated sample NMR spectroscopy measurement will be possible in a dual-phase, droplet-based approach where each droplet could be a different sample, as well as it solves the challenge of the relatively large dead volume in the tubing feeding the micro-NMR detector, which is several meters if sample injection is done outside of the magnet. The SNR was improved by 75% when implementing the automated triggered data acquisition.

Session: Instrumentation 1, time: 10:10am-10:30am

NMR with a fast moving coil array

Irfan Bulu; Shin Utsuzawa; Tancredi Botto; Jeffrey Paulsen; Martin D. Hurlimann; Lalitha Venkataramanan; Yi-Qiao Song
Schlumberger-Doll Research, Cambridge, MA
NMR is typically performed with the detector and sample in fixed relative positions. NMR well-logging, however, presents a challenge that the tool detector is in constant motion relative to sample. The conventional approach is to move the tool slow enough in order to be in a quasi-static limit. This paper shows a NMR system with multiple detectors (coils) in order to obtain high quality NMR data at high speeds. The use of multiple coils in both transmit and reception allows independent acquisition of position dependent signals and determination of the properties as a function of sample coordinate through a 2D inversion. Experimental setup and results on multiple samples will be discussed.