IBIC2018 - List of Keywords (scattering)

Paper	Title	Other Keywords	Page
MOPB06	DAΦNE Luminosity Monitor	luminosity, detector, simulation, experiment	81
	A. De Santis, C. Bisegni, O.R. Blanco-García, O. Coiro, A. Michelotti, C. Milardi, A. Stecchi INFN/LNF, Frascati (Roma), Italy
	The DAΦNE collider instantaneous luminosity has been measured identifying Bhabha scattering events at low polar angle (∼10°) around the beam axis by using two small crystal calorimeters shared with the KLOE-2 experiment. Independent DAQ setup based on !CHAOS, a novel Control System architecture, has been designed and realized in order to implement a fast luminosity monitor, also in view of the DAΦNE future physics runs. The realized setup allows for measurement of Bunch-by-Bunch (BBB) luminosity that allows to investigate the beam-beam interaction for the Crab-Waist collisions at DAΦNE and luminosity dependence on the bunch train structure.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB06
About •	paper received ※ 06 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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WEOC03	A Simple Model to Describe Smoke Ring Shaped Beam Profile Measurements With Scintillating Screens at the European XFEL	FEL, electron, diagnostics, ECR	366
	G. Kube, S. Liu, A.I. Novokshonov, M. Scholz DESY, Hamburg, Germany
	Standard beam profile measurements of high-brightness electron beams based on OTR may be hampered by coherence effects. Therefore it was decided for the European XFEL to measure transverse beam profiles based on scintillating screen monitors using LYSO:Ce. While it is possible to resolve beam sizes down to a few micrometers with this scintillator, the experience during the XFEL commissioning showed that the measured emittance values were significantly larger than the expected ones. In addition, beam profiles measured at bunch charges of a few hundred pC showed a ’smoke ring’ structure. While coherent OTR emission and beam dynamical influence can be excluded, it is assumed that the profile distortions are caused by effects from the scintillator material. Following the experience in high energy physics, a simple model was developed which takes into account quenching effects of excitonic carriers inside a scintillator in a heuristic way. Based on this model, the observed beam profiles can be understood qualitatively. Together with the model description, first comparisons with experiments will be presented, and new scintillators suitable for beam profile diagnostics will be discussed.
	Slides WEOC03 [2.411 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOC03
About •	paper received ※ 04 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THOA03	Progress on Transverse Beam Profile Measurement Using the Heterodyne Near Field Speckles Method at ALBA	radiation, target, undulator, experiment	538
	S. Mazzoni, F. Roncarolo, G. Trad CERN, Geneva, Switzerland U. Iriso, C. Kamma-Lorger, A.A. Nosych ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain M.A.C. Potenza Universita’ degli Studi di Milano & INFN, Milano, Italy M. Siano Università degli Studi di Milano, Milano, Italy
	We present the recent developments of a study aiming at measuring the transverse beam profile using the Heterodyne Near Field Speckles (HNFS) method. The HNFS technique consists of a suspension of nanoparticles suspended in a liquid and illuminated by synchrotron radiation (either in the visible or in X-ray wavelength range). The transverse coherence of the source, and therefore, under the conditions of validity of the Van Cittert and Zernike theorem, the transverse electron beam size is retrieved from the interference between the transmitted beam and the spherical waves scattered by each nanoparticle. We here describe the fundamentals of this technique, as well as the recent experimental results obtained with 12 keV radiation at the NCD beamline at ALBA. The applicability of such technique for future accelerators (e.g. CLIC or FCC) is also discussed.
	Slides THOA03 [2.414 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOA03
About •	paper received ※ 05 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THOB03	Long Term Investigation of the Degradation of Coaxial Cables	radiation, insertion, operation, photon	552
	M. Kuntzsch, R. Schurig HZDR, Dresden, Germany S.J. Burger Delta Gamma RF-Expert, Melbourne, Australia T. Weber el-spec GmbH, Geretsried, Germany
	For the transport of RF signals coaxial cables with PTFE (’Teflon’) as dielectric medium are widely used because they offer a wide bandwidth and low insertion loss. Coaxial cables that are routed in immediate vicinity to the beamline are exposed to ionizing radiation that is mainly generated by beam-loss. In this radiative environment cables change their electrical properties which directly affects the signal on the receiver side and in turn the measured beam parameters. This contribution describes a measurement setup at the superconducting CW accelerator ELBE that was used to investigate the degradation of coaxial cables under well-controlled conditions up to an accumulated dose of 94 kGy. Furthermore the acquired data up to 40 GHz of two coaxial cable samples are presented and the results are discussed.
	Slides THOB03 [6.958 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOB03
About •	paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOPB06

DAΦNE Luminosity Monitor

luminosity, detector, simulation, experiment

81

A. De Santis, C. Bisegni, O.R. Blanco-García, O. Coiro, A. Michelotti, C. Milardi, A. Stecchi
INFN/LNF, Frascati (Roma), Italy

The DAΦNE collider instantaneous luminosity has been measured identifying Bhabha scattering events at low polar angle (∼10°) around the beam axis by using two small crystal calorimeters shared with the KLOE-2 experiment. Independent DAQ setup based on !CHAOS, a novel Control System architecture, has been designed and realized in order to implement a fast luminosity monitor, also in view of the DAΦNE future physics runs. The realized setup allows for measurement of Bunch-by-Bunch (BBB) luminosity that allows to investigate the beam-beam interaction for the Crab-Waist collisions at DAΦNE and luminosity dependence on the bunch train structure.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB06

About •

paper received ※ 06 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

Export •

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

WEOC03

A Simple Model to Describe Smoke Ring Shaped Beam Profile Measurements With Scintillating Screens at the European XFEL

FEL, electron, diagnostics, ECR

366

G. Kube, S. Liu, A.I. Novokshonov, M. Scholz
DESY, Hamburg, Germany

Standard beam profile measurements of high-brightness electron beams based on OTR may be hampered by coherence effects. Therefore it was decided for the European XFEL to measure transverse beam profiles based on scintillating screen monitors using LYSO:Ce. While it is possible to resolve beam sizes down to a few micrometers with this scintillator, the experience during the XFEL commissioning showed that the measured emittance values were significantly larger than the expected ones. In addition, beam profiles measured at bunch charges of a few hundred pC showed a ’smoke ring’ structure. While coherent OTR emission and beam dynamical influence can be excluded, it is assumed that the profile distortions are caused by effects from the scintillator material. Following the experience in high energy physics, a simple model was developed which takes into account quenching effects of excitonic carriers inside a scintillator in a heuristic way. Based on this model, the observed beam profiles can be understood qualitatively. Together with the model description, first comparisons with experiments will be presented, and new scintillators suitable for beam profile diagnostics will be discussed.

Slides WEOC03 [2.411 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOC03

About •

paper received ※ 04 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019

Export •

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

THOA03

Progress on Transverse Beam Profile Measurement Using the Heterodyne Near Field Speckles Method at ALBA

radiation, target, undulator, experiment

538

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

We present the recent developments of a study aiming at measuring the transverse beam profile using the Heterodyne Near Field Speckles (HNFS) method. The HNFS technique consists of a suspension of nanoparticles suspended in a liquid and illuminated by synchrotron radiation (either in the visible or in X-ray wavelength range). The transverse coherence of the source, and therefore, under the conditions of validity of the Van Cittert and Zernike theorem, the transverse electron beam size is retrieved from the interference between the transmitted beam and the spherical waves scattered by each nanoparticle. We here describe the fundamentals of this technique, as well as the recent experimental results obtained with 12 keV radiation at the NCD beamline at ALBA. The applicability of such technique for future accelerators (e.g. CLIC or FCC) is also discussed.

Slides THOA03 [2.414 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOA03

About •

paper received ※ 05 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019

Export •

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

THOB03

Long Term Investigation of the Degradation of Coaxial Cables

radiation, insertion, operation, photon

552

M. Kuntzsch, R. Schurig
HZDR, Dresden, Germany
S.J. Burger
Delta Gamma RF-Expert, Melbourne, Australia
T. Weber
el-spec GmbH, Geretsried, Germany

For the transport of RF signals coaxial cables with PTFE (’Teflon’) as dielectric medium are widely used because they offer a wide bandwidth and low insertion loss. Coaxial cables that are routed in immediate vicinity to the beamline are exposed to ionizing radiation that is mainly generated by beam-loss. In this radiative environment cables change their electrical properties which directly affects the signal on the receiver side and in turn the measured beam parameters. This contribution describes a measurement setup at the superconducting CW accelerator ELBE that was used to investigate the degradation of coaxial cables under well-controlled conditions up to an accumulated dose of 94 kGy. Furthermore the acquired data up to 40 GHz of two coaxial cable samples are presented and the results are discussed.

Slides THOB03 [6.958 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOB03

About •

paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

Export •

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