Measurement of the orbit fluctuation caused by an insertion device with the amplitude modulation method

Nakatani, Takeshi; Agui, Akane; Yoshigoe, Akitaka; Matsushita, Tomohiro*; Takao, Masaru*; Aoyagi, Hideki*; Takeuchi, Masao*; Tanaka, Hitoshi*

AIP Conference Proceedings 705, p.290 - 293, 2004/00

https://doi.org/10.1063/1.1757791

We have developed a new method to extract only the orbit fluctuation caused by changing magnetic field error of an insertion device (ID). This method consists of two main parts. (i) The orbit fluctuation is measured with modulating the error field of the ID by using the real-time beam position measuring system. (ii) The orbit fluctuation depending on the variation of the error field of the ID is extracted by the filter applying the Wavelet Transform. We call this approach the amplitude modulation method. This analysis technique was applied to measure the orbit fluctuation caused by the error field of APPLE-2 type undulator (ID23) installed in the SPring-8 storage ring. We quantitatively measured two kinds of the orbit fluctuation which are the static term caused by the magnetic field error and the dynamic term caused by the eddy current on the ID23 chamber.

Analysis of the orbit distortion caused by SPring-8 ID23 using the wavelet transformation

Matsushita, Tomohiro*; Agui, Akane; Yoshigoe, Akitaka; Nakatani, Takeshi; Tanaka, Hitoshi*; Takao, Masaru*; Aoyagi, Hideki*; Takeuchi, Masao*

Hoshako, 15(5), p.303 - 307, 2002/05

http://ci.nii.ac.jp/naid/10009629724

no abstracts in English

First operation of circular dichroism measurements with periodic photon-helicity switching by a variably polarizing undulator at BL23SU at SPring-8

Agui, Akane; Yoshigoe, Akitaka; Nakatani, Takeshi*; Matsushita, Tomohiro*; Saito, Yuji; Yokoya, Akinari; Tanaka, Hitoshi*; Miyahara, Yoshikazu*; Shimada, Taihei; Takeuchi, Masao*; et al.

Review of Scientific Instruments, 72(8), p.3191 - 3197, 2001/08

https://doi.org/10.1063/1.1382635

no abstracts in English

Magnetic field calculation of variable polarizing undulator (APPLE-type) for SX beamline in the SPring-8

Kobayashi, Hideki*; Sasaki, Shigemi; Shimada, Taihei; Takao, Masaru*; Yokoya, Akinari;

JAERI-Tech 96-013, 32 Pages, 1996/03

JAERI-Tech-96-013.pdf:1.18MB

no abstracts in English

Analyses for a planar variably-polarizing undulator

Sasaki, Shigemi

Nuclear Instruments and Methods in Physics Research A, 347, p.83 - 86, 1994/00

https://doi.org/10.1016/0168-9002(94)91859-7

no abstracts in English

Analysis of advanced planar polarized light emitter

Kakuno, Kazunori*; Sasaki, Shigemi; Shimada, Taihei;

JAERI-M 93-156, 27 Pages, 1993/08

JAERI-M-93-156.pdf:1.06MB

no abstracts in English

Design of a new type of planar undulator for generating variably polarized radiation

Sasaki, Shigemi; Kakuno, Kazunori*; *; Shimada, Taihei; ;

Nuclear Instruments and Methods in Physics Research A, 331, p.763 - 767, 1993/00

https://doi.org/10.1016/0168-9002(93)90153-9

no abstracts in English

Conceptual design of vertical undulator

Kakuno, Kazunori*; Sasaki, Shigemi

JAERI-M 92-157, 11 Pages, 1992/10

JAERI-M-92-157.pdf:0.56MB

no abstracts in English

The Effect of magnetic field shape on undulator radiation spectrum

*; Sasaki, Shigemi

JAERI-M 91-155, 18 Pages, 1991/10

JAERI-M-91-155.pdf:0.58MB

no abstracts in English

Experimental evidences of light's orbital angular momentum carried by helical undulator harmonics

Sasaki, Shigemi*; Miyamoto, Atsushi*; Hosaka, Masahito*; Yamamoto, Naoto*; Kyo, Ayataro*; Kato, Masahiro*; Imazono, Takashi; Koike, Masato

no journal, , 

The phenomenon of higher harmonic radiation from a helical undulator carrying orbital angular momentum (OAM) attracts a great deal of attention because this novel property may be used as a new probe for synchrotron radiation science that would be performed in diffraction limited light source facilities. Although a diffraction limited VUV and X-ray sources do not yet exist, the 750 MeV UVSOR-III is already a diffraction limited light source in the UV region. In this ring, a tandem-aligned double-APPLE undulator system is installed. Using this set-up, we observed spiral interference patterns between two different harmonic radiations with a scanning fiber multi-channel spectrometer and a CCD camera placed at the end of BL1U beamline. By these measurements, various interference patterns such as single, double, and triple spirals were observed which concur with the theoretical prediction for every mode in the right or left circular polarization.