title: Continuously Tunable 250 GHz Gyrotron with a Double Disk Window for DNP-NMR Spectroscopy.
abstract: In this paper, we describe the design and experimental results from the rebuild of a 250 GHz gyrotron used for Dynamic Nuclear Polarization enhanced Nuclear Magnetic Resonance spectroscopy on a 380 MHz spectrometer. Tuning bandwidth of approximately 2 GHz is easily achieved at a fixed magnetic field of 9.24 T and a beam current of 95 mA producing an average output power of >10 W over the entire tuning band. This tube incorporates a double disk output sapphire window in order to maximize the transmission at 250.58 GHz. DNP Signal enhancement of >125 is achieved on a13C-Urea sample using this gyrotron.
authors.affiliation: Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA-02139, USA.
authors.forename: Sudheer
authors.initials: S
authors.lastname: Jawla
authors.forename: Qing Zhe
authors.initials: QZ
authors.lastname: Ni
authors.forename: Alexander
authors.initials: A
authors.lastname: Barnes
authors.forename: William
authors.initials: W
authors.lastname: Guss
authors.forename: Eugenio
authors.initials: E
authors.lastname: Daviso
authors.forename: Judith
authors.initials: J
authors.lastname: Herzfeld
authors.forename: Robert
authors.initials: R
authors.lastname: Griffin
authors.forename: Richard
authors.initials: R
authors.lastname: Temkin
keywords: Double Disk Window; Frequency Tunable; Gaussian Beam; Gyrotron; Waveguide
references.citation: J Biomol NMR. 2007 Feb;37(2):113-6
references.pmid: 17216304
references.citation: Proc Natl Acad Sci U S A. 2002 Dec 24;99(26):16742-7
references.pmid: 12481027
references.citation: Biophys J. 2000 Aug;79(2):767-75
references.pmid: 10920010
references.citation: Appl Magn Reson. 2008 Aug;34(3-4):237-263
references.pmid: 19194532
references.citation: J Am Chem Soc. 2007 May 2;129(17):5719-29
references.pmid: 17417850
references.citation: Proc Natl Acad Sci U S A. 2004 Jan 20;101(3):711-6
references.pmid: 14715898
references.citation: Protein Sci. 2008 Feb;17(2):199-204
references.pmid: 18227427
references.citation: J Magn Reson. 2011 May;210(1):16-23
references.pmid: 21382733
references.citation: Proc Natl Acad Sci U S A. 2008 Jan 22;105(3):883-8
references.pmid: 18195364
references.citation: Curr Opin Struct Biol. 2004 Feb;14(1):96-103
references.pmid: 15102455
references.citation: Phys Chem Chem Phys. 2010 Jun 14;12(22):5799-803
references.pmid: 20518128
references.citation: Biochemistry. 2010 Sep 7;49(35):7474-84
references.pmid: 20707313
references.citation: J Am Chem Soc. 2002 Apr 3;124(13):3214-5
references.pmid: 11916398
references.citation: Science. 1991 Feb 15;251(4995):783-6
references.pmid: 1990439
references.citation: Phys Chem Chem Phys. 2010 Jun 14;12(22):5861-7
references.pmid: 20454732
references.citation: J Magn Reson. 2012 Aug;221:147-53
references.pmid: 22743211
references.citation: IEEE Trans Electron Devices. 2010 Jun 7;38(6):1150-1159
references.pmid: 23761938
references.citation: Proc Natl Acad Sci U S A. 2009 Jun 9;106(23):9244-9
references.pmid: 19474298
references.citation: IEEE Trans Plasma Sci IEEE Nucl Plasma Sci Soc. 2007 Jun;35(3):559-564
references.pmid: 19081779
references.citation: IEEE Trans Terahertz Sci Technol. 2011 Aug 29;1(1):145-163
references.pmid: 24639915
references.citation: Biochemistry. 2008 Mar 25;47(12):3822-31
references.pmid: 18302341
references.citation: Phys Chem Chem Phys. 2010 Jun 14;12(22):5850-60
references.pmid: 20449524
references.citation: IEEE Trans Plasma Sci IEEE Nucl Plasma Sci Soc. 2010 Jun 1;38(6):1150-1160
references.pmid: 21243088
references.citation: Angew Chem Int Ed Engl. 2010 Oct 11;49(42):7803-6
references.pmid: 20726023
references.citation: IEEE Trans Microw Theory Tech. 2005 Jun;53(6 I):1863-1869
references.pmid: 17901907
references.citation: J Magn Reson. 2010 Jul;205(1):177-9
references.pmid: 20488737
references.citation: J Magn Reson. 2012 Nov;224:1-7
references.pmid: 23000974
references.citation: J Infrared Millim Terahertz Waves. 2012 Jul 1;33(7):695-714
references.pmid: 23162673
references.citation: Proc Natl Acad Sci U S A. 2008 Feb 5;105(5):1483-8
references.pmid: 18230730
references.citation: Biophys J. 2008 Jan 15;94(2):434-45
references.pmid: 17827230
references.citation: Phys Rev Lett. 1993 Nov 22;71(21):3561-3564
references.pmid: 10055008
references.citation: J Magn Reson. 2003 Feb;160(2):85-90
references.pmid: 12615147
references.citation: Phys Chem Chem Phys. 2010 Jun 14;12(22):5786-90
references.pmid: 20461255
references.citation: J Am Chem Soc. 2001 Feb 7;123(5):1010-1
references.pmid: 11456650