A new PLS-II in-vacuum undulator and characterization of undulator radiation

Kim, D-E.; Lee, H-H.; Park, K-H.; Seo, H.S.; Ha, Tae Kwon; Jeong, Y-G.; Han, Hyunsook; Lee, W.W.; Huang, J. Y.; Nam, Sang Boo; Kr, Kim; Shin, Seunghwan

doi:10.3938/jkps.69.903

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…In-vacuum undulators (Kim et al, 2016) with a period length of 20 mm and a peak field of 0.97 T are used in the PLS-II ring to produce such X-rays in the fundamental or higher harmonics. Twelve narrow-gap in-vacuum undulators are presently in operation; they unfortunately produce coupled bunch instabilities by resistive wall impedance and thereby limit the stored beam current.…”

Section: Diagnosis Of Instabilities and Beam Dumpmentioning

confidence: 99%

Bunch-by-bunch position measurement and analysis at PLS-II

Lee

Chun

Kim

et al. 2017

J Synchrotron Radiat

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A bunch-by-bunch measurement system has been developed at Pohang Light Source II. The system consists of a four-channel button pick-up, 20 GHz sampling oscilloscope and an 800 MHz low-pass digital filter. Upon measuring a bunch-by-bunch spatio-temporal beam motion matrix over many turns, singularvalue decomposition analysis is used to reveal the dominant coupled-bunch modes. The system can diagnose injection oscillations due to kicker errors and the effect of resistive-wall impedance that gives rise to instability during operation.

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Section: Diagnosis Of Instabilities and Beam Dumpmentioning

confidence: 99%

Bunch-by-bunch position measurement and analysis at PLS-II

Lee

Chun

Kim

et al. 2017

J Synchrotron Radiat

Self Cite

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Development of XANES nanoscopy on BL7C at PLS-II

et al. 2020

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X‐ray absorption near‐edge structure (XANES) imaging is a powerful tool to visualize the chemical state distribution of transition‐metal‐based materials at synchrotron radiation facilities. In recent years, the electrochemical working rechargeable battery has been the most studied material in XANES imaging owing to the large increase of portable electronics and electric vehicles. This work acknowledges the importance of battery analysis and has developed the XANES imaging system on BL7C at Pohang Light Source‐II (PLS‐II). BL7C employs an undulator taper configuration to obtain an energy band >130 eV near the K‐absorption edge of the target element with a minimum energy interval >0.2 eV. While measuring energy‐dependent images, the zone plate translation maintains the best focus, and then various data processes such as background correction, image registration and clustering allow single XANES spectrum extraction and chemical distribution mapping. Here, the XANES imaging process is described, the XANES spectrum quality is identified and the chemical states of the partially charged cathode material used in lithium‐ion batteries as an application example are examined.

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A new PLS-II in-vacuum undulator and characterization of undulator radiation

Cited by 2 publications

References 9 publications

Bunch-by-bunch position measurement and analysis at PLS-II

Bunch-by-bunch position measurement and analysis at PLS-II

Development of XANES nanoscopy on BL7C at PLS-II

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