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Terahertz-range free-electron laser electron spin resonance spectroscopy: Techniques and applications in high magnetic fields
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10.1063/1.3155509
/content/aip/journal/rsi/80/7/10.1063/1.3155509
http://aip.metastore.ingenta.com/content/aip/journal/rsi/80/7/10.1063/1.3155509

Figures

Image of FIG. 1.
FIG. 1.

Schematic view of one of the FELs used at the FZD.

Image of FIG. 2.
FIG. 2.

The wavelength (frequency) range of the U27 and U100 undulators as a function of kinetic electron energy calculated for different undulator parameters .

Image of FIG. 3.
FIG. 3.

Typical measured output power vs wavelength for the two undulators, U27 and U100 , for different kinetic electron energies (user statistics for years 2008 and 2009).

Image of FIG. 4.
FIG. 4.

Schematic view of the U100-based FEL. The electron beam enters the FEL from the right side.

Image of FIG. 5.
FIG. 5.

Example of spectral distribution of FEL power (symbols) and the corresponding Gaussian line-shape fit (line) for a wavelength of . The full spectral width at half maximum is 0.8%.

Image of FIG. 6.
FIG. 6.

Schematic view of a 8.5 MJ/70 T pulsed-field magnet. Main parts of the magnet are: coil (1), reinforcement cylinder (2), G-10 end flanges (3), and current leads (4).

Image of FIG. 7.
FIG. 7.

Block-diagram of the ESR spectrometer. The FEL (1) is used as source of electromagnetic radiation. Other parts of the spectrometer are: an IR detector (2), the pulsed-field magnet (3) in a bath with liquid nitrogen (4), a cryostat (5), a temperature controller (6), a data-acquisition system (7), and a probe (8). The magnet is fed by the capacitive power supply (9). A temperature sensor and a pick-up coil (10) are installed close to the sample area. Oversized multimode cylindrical waveguides (11) are used to transmit the radiation from the FEL to the probe, and then to the detector.

Image of FIG. 8.
FIG. 8.

ESR absorption in DPPH (obtained at a wavelength of , a temperature of 7 K) and magnetic field (shown by the dashed line) vs time. The maximum of the field is 62 T. The inset shows the ESR absorption in DPPH as function of magnetic field. The solid line represents a Gaussian fit with . The 8.5 MJ/70 T magnet was used.

Image of FIG. 9.
FIG. 9.

ESR absorption in (obtained at a wavelength of , a temperature of 80 K) and magnetic field (shown by the dashed line) vs time. Two sharps absorption lines at 43.8 T corresponding to ESR during the up and down field sweeps are observed. The maximum of the field is 52 T. The 1.4 MJ/60 T magnet was used.

Tables

Generic image for table
Table I.

FEL specifications.

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/content/aip/journal/rsi/80/7/10.1063/1.3155509
2009-07-08
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz-range free-electron laser electron spin resonance spectroscopy: Techniques and applications in high magnetic fields
http://aip.metastore.ingenta.com/content/aip/journal/rsi/80/7/10.1063/1.3155509
10.1063/1.3155509
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