Frequency tunable gyrotrons for sub-THz CW radiation sources of DNP-NMR experiment

Author

Idehara, T. ; Ogawa, I. ; Kobayashi, S. ; Agusu, La ; Mitsudo, S. ; Saito, T. ; Chang, T.H. ; Chiu, C.C.

Author_Institution

Res. Center for Dev. of Far Infrared Region, Univ. of Fukui, Fukui

fYear

2008

fDate

15-19 June 2008

Firstpage

1

Lastpage

1

Abstract

Summary form only given. Dynamic nuclear polarization (DNP) method can enhance the sensitivity of NMR for extending its application to wide fields including analysis of protein molecule and study on material surface. For this objective, it is needed to develop high power sub-THz radiation sources which operate in long time CW mode. We have already developed a 395 GHz CW gyrotron for 600 MHz proton NMR. The next target is to realize frequency continuous tuning for adjustment to the best condition of DNP-NMR. As a preliminary experiment on frequency continuous tuning of gyrotron, we tried to use backward-wave components with different axial mode numbers. The latest gyrotron of Gyrotron FU CW Series, Gyrotron FU CW IV has already succeeded in frequency tenability in a wide range of 6 GHz around 140 GHz. We will present the design and experimental setup and results in detail.

Keywords

gyrotrons; nuclear magnetic resonance; submillimetre wave generation; DNP-NMR experiment; dynamic nuclear polarization; frequency continuous tuning; frequency tunable gyrotrons; material surface; protein molecule; sub-THz CW radiation sources; Finite impulse response filter; Frequency; Gyrotrons; Millimeter wave technology; Nuclear magnetic resonance; Physics; Polarization; Proteins; Protons; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Plasma Science, 2008. ICOPS 2008. IEEE 35th International Conference on

Conference_Location

Karlsruhe

ISSN

0730-9244

Print_ISBN

978-1-4244-1929-6

Electronic_ISBN

0730-9244

Type

conf

DOI

10.1109/PLASMA.2008.4590848

Filename

4590848