NDLI: Experimental demonstration of a 527 GHz gyrotron for dynamic nuclear polarization

Content Provider	IEEE Xplore Digital Library
Author	Blank, M. Borchard, P. Cauffman, S. Felch, K. Rosay, M. Tometich, L.
Copyright Year	2013
Description	Author affiliation: Bruker Biospin., Billerica, MA, USA (Rosay, M.; Tometich, L.) \|\| Commun. & Power Ind., Palo Alto, CA, USA (Blank, M.; Borchard, P.; Cauffman, S.; Felch, K.)
Abstract	Summary form only given. The experimental demonstration of a 527 GHz, continuous wave (CW) gyrotron operating at the second cyclotron harmonic in a 9.7 T magnetic field is described. The gyrotron is currently being used in Dynamic Nuclear Polarization (DNP) experiments at the University of Utrecht in the Netherlands. DNP is a technique used to enhance the sensitivity of nuclear magnetic resonance (NMR) experiments by transferring the higher polarization of unpaired electrons spins to nuclear spins. The gyrotron is designed to operate in the second harmonic $TE_{15,3,1}$ mode. The interaction is driven, nominally, by a 17.5 kV, 140 mA electron beam produced by a single-anode magnetron injection gun. A Bruker cryogen-free superconducting magnet provides the 9.7 T magnetic field required for the interaction. An internal mode converter, consisting of a rippled-wall launcher and four steering and shaping mirrors, is used to convert the $TE_{15,3}$ interaction mode to a high-quality Gaussian beam. The resultant Gaussian beam exits the gyrotron through a vacuum window and is injected into a corrugated waveguide and transported to the NMR spectrometer. During gyrotron tests, CW output power levels up to 25 W were achieved with an 18 kV, 97 mA electron beam. Infrared images of the output beam showed excellent Gaussian characteristics which were nearly identical to those of the theoretical design beam. A mathematical modal decomposition of the measured beam images showed a 98.5% overlap with the design Gaussian beam. The gyrotron operated stably for prolonged periods of time with frequency variations of less than 1MHz and power variations of less than 0.3 W. The gyrotron has been in use for DNP experiments since November 2012.
Starting Page	1
Ending Page	1
File Size	130243
Page Count	1
File Format	PDF
ISBN	9781467351713
ISSN	07309244
DOI	10.1109/PLASMA.2013.6635226
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gyrotrons Polarization Nuclear magnetic resonance Harmonic analysis Magnetic fields Electron beams Superconducting magnets
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

First tests of a 527 GHz gyrotron for dynamic nuclear polarization

Demonstration of a 263 GHz gyrotron for Dynamic Nuclear Polarization

Design of a 460 GHz second harmonic gyrotron oscillator for use in dynamic nuclear polarization

527 GHz gyrotron for DNP-NMR spectroscopy

Design and experimental results from a 527 GHz gyrotron for DNP-NMR spectroscopy

94 GHz, 25 kW CW, low-voltage harmonic gyrotron

94-GHz 25-kW CW low-voltage harmonic gyrotron

Development and demonstration of high frequency gyrotrons for NMR/DNP applications

94 GHz sixth-harmonic slotted gyrotron

Experimental demonstration of a 527 GHz gyrotron for dynamic nuclear polarization

Similar Documents

First tests of a 527 GHz gyrotron for dynamic nuclear polarization

Demonstration of a 263 GHz gyrotron for Dynamic Nuclear Polarization

Design of a 460 GHz second harmonic gyrotron oscillator for use in dynamic nuclear polarization

527 GHz gyrotron for DNP-NMR spectroscopy

Design and experimental results from a 527 GHz gyrotron for DNP-NMR spectroscopy

94 GHz, 25 kW CW, low-voltage harmonic gyrotron

94-GHz 25-kW CW low-voltage harmonic gyrotron

Development and demonstration of high frequency gyrotrons for NMR/DNP applications

94 GHz sixth-harmonic slotted gyrotron

Experimental demonstration of a 527 GHz gyrotron for dynamic nuclear polarization