IBIC2019 - List of Keywords (synchrotron-radiation)

Paper	Title	Other Keywords	Page
TUPP031	Electron Beam Size Measurements Using the Heterodyne Near Field Speckles at ALBA	radiation, experiment, synchrotron, undulator	383
	M. Siano, M.A.C. Potenza Universita’ degli Studi di Milano & INFN, Milano, Italy U. Iriso, C.S. Kamma-Lorger, A.A. Nosych ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain S. Mazzoni, G. Trad CERN, Geneva, Switzerland B. Paroli Universita’ degli Studi di Milano, Milano, Italy
	Experiments using the heterodyne near field speckle method (HNFS) have been performed at ALBA to characterize the spatial coherence of the synchrotron radiation, with the ultimate goal of measuring both the horizontal and vertical electron beam sizes. The HNFS technique consists on the analysis of the interference between the radiation scattered by a colloidal suspension of nanoparticles and the synchrotron radiation, which in this case corresponds to the hard x-rays (12keV) produced by the in-vacuum undulator of the NCD-Sweet beamline. This paper describes the fundamentals of the technique, possible limitations, and shows the first experimental results changing the beam coupling of the storage ring.
	Poster TUPP031 [2.093 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP031
About •	paper received ※ 06 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPP038	Observation of Microbunching Instabilities using THz Detector at NSLS-II	detector, radiation, synchrotron, dipole	629
	W.X. Cheng ANL, Lemont, Illinois, USA B. Bacha, G.L. Carr BNL, Upton, New York, USA
	Microbunching instabilities have been observed in several light sources with high single bunch current stored. The instability is typically associated with threshold beam currents. Energy spread and bunch length are increasing above the thresholds. Recently, a terahertz (THz) detector was installed at the cell 22 infrared (IR) beamline at NSLS-II storage ring to study the micro-bunch instabilities. The IR beamline has wide aperture allowing long-wavelength synchrotron radiation or microwave signal propagate to the end station, where the detector was installed. The detector output signal has been analyzed using oscilloscope, spectrum analyzer and FFT real-time spectrum analyzer. Clear sidebands appear as single bunch current increases and the sidebands tend to shift/jump. We present measurement results of the THz detector at different nominal bunch lengths and ID gaps.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP038
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUPP031

Electron Beam Size Measurements Using the Heterodyne Near Field Speckles at ALBA

radiation, experiment, synchrotron, undulator

383

M. Siano, M.A.C. Potenza
Universita’ degli Studi di Milano & INFN, Milano, Italy
U. Iriso, C.S. Kamma-Lorger, A.A. Nosych
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
S. Mazzoni, G. Trad
CERN, Geneva, Switzerland
B. Paroli
Universita’ degli Studi di Milano, Milano, Italy

Experiments using the heterodyne near field speckle method (HNFS) have been performed at ALBA to characterize the spatial coherence of the synchrotron radiation, with the ultimate goal of measuring both the horizontal and vertical electron beam sizes. The HNFS technique consists on the analysis of the interference between the radiation scattered by a colloidal suspension of nanoparticles and the synchrotron radiation, which in this case corresponds to the hard x-rays (12keV) produced by the in-vacuum undulator of the NCD-Sweet beamline. This paper describes the fundamentals of the technique, possible limitations, and shows the first experimental results changing the beam coupling of the storage ring.

Poster TUPP031 [2.093 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP031

About •

paper received ※ 06 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPP038

Observation of Microbunching Instabilities using THz Detector at NSLS-II

detector, radiation, synchrotron, dipole

629

W.X. Cheng
ANL, Lemont, Illinois, USA
B. Bacha, G.L. Carr
BNL, Upton, New York, USA

Microbunching instabilities have been observed in several light sources with high single bunch current stored. The instability is typically associated with threshold beam currents. Energy spread and bunch length are increasing above the thresholds. Recently, a terahertz (THz) detector was installed at the cell 22 infrared (IR) beamline at NSLS-II storage ring to study the micro-bunch instabilities. The IR beamline has wide aperture allowing long-wavelength synchrotron radiation or microwave signal propagate to the end station, where the detector was installed. The detector output signal has been analyzed using oscilloscope, spectrum analyzer and FFT real-time spectrum analyzer. Clear sidebands appear as single bunch current increases and the sidebands tend to shift/jump. We present measurement results of the THz detector at different nominal bunch lengths and ID gaps.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP038

About •

paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)