Spectrum of coherent synchrotron radiation in the far-infrared region

Ishi, K.; Shibata, Yukio; Takahashi, Toshiharu; Mishiro, H.; Ohsaka, T.; Ikezawa, Mikihiko; Kondo, Yasuhiro; Nakazato, T.; Urasawa, S.; Nakabayashi, Nobuo; Kato, R.; Shibasaki, Y.; Oyamada, M.

doi:10.1103/physreva.43.5597

Cited by 65 publications

(27 citation statements)

References 16 publications

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“…Observation of coherent synchrotron radiation (CSR) from a single bunch traveling in a bending magnet [15][16][17][18] has encouraged Dr. Yamada to pay attention to the lasing scheme with PhSR. Here, the CSR denotes radiation emitted from a number of electrons in a bunch all in the same phase.…”

Section: Photon Storage Ring (Phsr) Outputmentioning

confidence: 99%

Infrared Spectroscopy Beamline Based on a Tabletop Storage Ring

2012

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An optical beamline dedicated to the infrared (IR) spectroscopy has been constructed at MIRRORCLE, a tabletop storage ring. The beamline has been designed for the use of infrared synchrotron radiation (IRSR) emitted from a bending magnet of 156 mm bending radius with the acceptance angle of 355(H) × 138(V) mrad to obtain high flux. The IR emission is forced by an exactly circular optics, named photon storage ring (PhSR), placed around the electron orbit and is collected by a "magic mirror" associated with two plane mirrors in the storage ring. A Fourier transform interferometer has been installed to utilize the IRSR at MIRRORCLE. The design of the optical system and calculated results are reported.

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Section: Photon Storage Ring (Phsr) Outputmentioning

confidence: 99%

Infrared Spectroscopy Beamline Based on a Tabletop Storage Ring

2012

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“…When performing the compression at low energy, both velocity-field and centrifugal space-charge forces are not yet strongly suppressed by the relativistic cancellation of electric and magnetic fields, and their emittance-damaging effect becomes significant, especially in bending trajectories. In the case of compression at higher energy, one has to deal with deleterious effects of coherent synchrotron radiation (CSR) on the longitudinal as well as the transverse phase space 18,19,20 . An alternative scheme which may preserve the transverse phase space quality while compressing the beam to sub-ps bunch length has been proposed by Serafini and Ferrario (SF) 21 .…”

Section: Velocity Bunching Velocity Bunching Studies At Neptunementioning

confidence: 99%

Award Final Technical Report

Rosenzweig¹

2007

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OverviewAs stated above, a broad range of investigations into SASE FELs and high brightness beams were proposed 3 years ago at a preceding grant renewal point. We have accomplished the majority of the stated physics goals, and added other areas of investigation, extending well beyond the scope of the original proposal as the research developed and new opportunities came into view.We review the results in high brightness beam and beam-based radiation physics that have been obtained under this grant's support in the following sections, by topic:Experiments on ultra-short beam creation and coherent radiation generation at UCLAdesigned and built chicane compressor at the BNL ATF. UCLA-performed SASE FEL experiments at VISA, also located at the ATF. Initial velocity bunching experiments at the UCLA Neptune Lab. Velocity bunching experiments performed at the LLNL PLEIADES inverse-Comptonscattering experiment injector. Use of compressed ultra-short beams in ICS experiments. Development and use of high gradient permanent-magnet quadrupole-based final focus systems at PLEIADES, to create ultra-small beam spots for ICS and other applications.These topics will form the background for discussing progress in: computational and theoretical studies, student training, publications, and technology development. We report the progress towards new experimental facilities (advanced injector and diagnostic development at SLAC and INFN), in the context the following section, as lays the groundwork for the discussion of proposed future experiments. BNL Compressor ExperimentsThe chicane compressor at the BNL ATF has been installed in the high-energy beam line after the injector. Significant delays as well as cost increases were encountered in this project because of BNL safety approval demands. The increases in costs were born partially by the DoE BES grant that nominally funds on-campus FEL work, and also by donations of labor and diagnostic equipment from collaborators INFN-LNF (Frascati). Initial data was obtained in late 2004 from this experiment.The compression experiments at ATF have focused on creation of very short (~20-25 micron rms) beam pulses, and on testing the effects of coherent synchrotron radiation (CSR) and of coherent edge radiation (CER) emitted from such short beams. Both of these radiation effects are under investigation for their link to a new form of microbunching instability. The UCLA effort has indeed identified the link between this instability, which may greatly impact the performance of compressors in short wavelength FELs such as the LCLS, and the FEL instability itself. A theoretical study of the comparison between these two instabilities 1 has been published in Physical Review STAB. The microbunching instability is found to have both high gain and low gain regimes which are similar to those corresponding to the FEL, but much stronger. The CSR instability may assert itself in less than a bending period -and can strongly filament the beam's longitudinal phase space.The closely related CER effect 2,3,4 has n...

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“…In the infrared spectrum, the "growth rays" [4,5] ranging of 4-14 μm belongs to far-infrared (FIR) spectrum, which is named ascribed to its many beneficial effects represented on organisms [6][7][8][9]. For thousands of years, FIR radiation has commonly been used in Chinese medicine to cure diseases by means of moxibustion [10,11].…”

Section: Introductionmentioning

confidence: 99%

Antioxidative Effect of Far-Infrared Radiation in Human

Lin

Lee²,

Lung³

et al. 2013

PHF

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Abstract-The antioxidative effect of far-infrared radiation (FIR) in human was evaluated by half maximal inhibitory concentration of blood against superoxide anions. All samples ranging from 18 to 30 years old were grouped into sympathetic, parasympathetic, sympathetic plus parasympathetic and the control group. The ability of antioxidation of blood from the subjects was measured with an ultraweak chemiluminescence analyzer. According to the results, the level of superoxide anions was decreased in sympathetic, parasympathetic, and sympathetic plus parasympathetic group, while that in the control group was increased. This suggested that the FIR radiation performed a significantly antioxidative effect by defending human from oxidative damage of superoxide anions in blood. This may probably be achieved by increasing SOD concentration and/or increasing heart rate variability.

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Spectrum of coherent synchrotron radiation in the far-infrared region

Cited by 65 publications

References 16 publications

Infrared Spectroscopy Beamline Based on a Tabletop Storage Ring

Infrared Spectroscopy Beamline Based on a Tabletop Storage Ring

Award Final Technical Report

Antioxidative Effect of Far-Infrared Radiation in Human

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