MEDSI2018 - Classification: Precision mechanics / Stability Issues

Paper	Title	Page
WEOAMA06	Concepts and Instrumentation for Scanning Free X-ray Emission Spectroscopy
	D. Grötzsch, R.G. Gnewkow, B. Kanngießer, W. Malzer, C.S. Schlesiger Technische Universität Berlin, Berlin, Germany LC.A. Anklamm Helmut Fischer GmbH, Sindelfingen, Germany S.D. DeBeer, S.P. Peredkov MPI CEC, Mülheim an der Ruhr, Germany
	X-ray Emission spectroscopy is a common tool for the study of the electronic structure of chemical compounds,* and a widely used technic at synchrotron facilities. There are two different principles. Johansson spectrometers with scanning excitation energy rely on highly precise motorized axes, whereas polychromatic Von Hamos spectrometers don't need the scanning modus. We present different von Hamos Spectrometer concepts and instruments dedicated for synchrotron and laboratory use. The presentation includes everything from the idea, planning, development, design and mounting to the commissioning, alignment and first operation. Furthermore we found a common solution for both different excitations, synchrotron and laboratory sources with respect to reliable energy alignment. The requirements to the mechanics, especially positioning devices which are both commercial and self-developed will also be explained. C.J. Pollock, S. DeBeer, Accounts of Chemical Research, 48, 2967, (2015) *C.J. Pollock, M.U. Delgado-Jaime, M. Atanasov, F. Neese, S. DeBeer, J. of the American Chemical Society 136, 9453 (2014)
	Slides WEOAMA06 [7.156 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH09	Vibrational Stability of a Cryocooled Double Crystal Monochromator at SSRF	220
	Y. Fan, H.L. Qin SSRF, Shanghai, People's Republic of China Z. L. Li, F. Tao, W. Zhu SINAP, Shanghai, People's Republic of China
	There is an increasingly critical demand on the angular stability of double crystal monochromator (DCM). This work focuses on a method to measure angular vibration directly at the DCM crystals using a dual-frequency interferometer. This method was applied to the off-line test of a newly developed cryocooled DCM at Shanghai Syn-chrotron Radiation Facility (SSRF), which can obtain a resolution of 8 nrad. The DCM was then tested on the X-ray Test Line. Both off-line and on-line results were referenced for DCM structure optimizations. In this paper, the DCM angular stability measuring method is presented, and detailed information of the results are shown.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH09
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH13	Vibration Monitoring at TPS Storage Ring	227
	K.H. Hsu, C.K. Kuan, W.Y. Lai, H.S. Wang NSRRC, Hsinchu, Taiwan
	In order to locate irregular vibrations caused by the installation of new equipment or malfunctioning of the machine, a vibration monitoring system was developed for the storage ring. Totally, 72 accelerometers and 10 velocity sensors were used to detect girder and ground vibrations, respectively. Continuous long-time observation results will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH13
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH15	Experimental Modal Analysis Vibration Measurement to Inform Engineering Design	235
	J.H. Kelly DLS, Oxfordshire, United Kingdom
	Experimental Modal Analysis was performed on an existing 5 degree of freedom mirror system on beamline I08 at The Diamond Light Source, by impacting the structure and measuring the response at locations of interest. Commercial software was used to generate the frequency response functions and mode shape animations. This experimental information was used to inform and optimise a design iteration for a new mirror system. The new mechanism was designed, installed and tested on the J08 branch line at The Diamond Light Source to validate the expected improvements in stability, stiffness and resonant frequency. The mirror system fundamental resonant frequency was significantly increased from 20 Hz to 49 Hz.
	Poster WEPH15 [0.411 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH15
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH18	Operation Status of HLS System Installed to Measure Ground Change of Large Scientific Equipment in Real Time	245
	H. J. Choi, J.H. Han, H.-S. Kang, S.H. Kim, S.N. Kim, H.-G. Lee, S.B. Lee PAL, Pohang, Kyungbuk, Republic of Korea
	Several parts that comprise the large scientific equipment should be installed and operated at precise three-dimensional location coordinates X, Y, and Z through survey and alignment to ensure their optimal performance. As time goes by, however, the ground goes through uplift and subsidence, which consequently changes the coordinates of installed components and leads to alignment errors. As a result, the system parameters change, and the performance of the large scientific equipment deteriorates accordingly. Measuring the change in locations of systems comprising the large scientific equipment in real time would make it possible to predict alignment errors, locate any region with greater changes, realign components in the region fast, and shorten the time of survey and alignment. For this purpose, a WPS's (wire position sensor) are installed in undulator section and a HLS's (hydrostatic leveling sensor) are installed in PAL-XFEL building. This paper is designed to introduce performance enhancements to reduce observed phenomena and measurement errors in the HLS system operation process.
	Poster WEPH18 [2.958 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH18
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH19	Positioning Behavior of a Lead-Screw Type In-Vacuum Actuator
	L. Lee, D.S. Morton, M.L. Ng, L. Zhang SLAC, Menlo Park, California, USA
	In-vacuum actuators are under consideration for operating the bending flexturs of the new Kirkpatrick-Baez focusing mirrors as part of the upgrade to LCLS-II. To achieve an mechanical accuracy of better than 10⁴, the characteristics of the actuators need to be explored. We designed a testing procedure in terms of both setup and actuator excursion program to understand various behaviors of the actuator in a simulated typical operating condition. Multiple independent sensors were used, including optical linear encoder, laser interferometer and capacitive sensors. In this presentation, I will show the testing procedure and results obtained for a commercially available high-precision leadscrew type in-vacuum linear actuator with a stroke of 10 mm and a resolution of 2.5 nm. It was found that under typical static operation conditions, an accuracy of 10⁴ can be achieved without external encoder feedback. Detailed behaviors regarding repeatability and backlash are also discussed.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH20	Upgrade of Double Crystal Monochromators for EMBL Beamlines at PETRAIII
	F. Liu ShanghaiTech University, Shanghai, People's Republic of China Blanchet, C. Blanchet, G. Bourenkov, S. Fiedler, T. Gehrmann, D. Jahn, G. Marshall, Meyer, J. Meyer, G. Pompidor, U. Ristau EMBL, Hamburg, Germany
	Double crystal monochromators (DCM) are very important instruments in hard X-ray beamlines. Publications have indicated that the mechanical stability of the DCM would affect the whole beam quality very much. To upgrade the performance of the DCMs of the EMBL beamlines, the vibrational stability, thermal stability and mechanical repeatability were improved. To improve the vibrational stability, an off-line vibration measurement for the pitch and roll, as well as the perp, were designed with a set of in-vacuum interferometers was developed for measuring the vibrations without X-ray beam. Then several attempts were tried to reduce the vibration caused by the cooling system, in the end, the pitch vibration was improved from 390nrad to 50nrad. To improve the thermal stability, the cooling blocks and thermal braids were optimized with the FEA methods, the steady time of the 2nd crystal were improved from 2.5 hours to less than 45 minutes after each energy change. To improve the repeatability of the orientation, the wedge jacks were replaced by worm gear boxes, repeatability was reached to less than 3 um.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH26	High Rigidity Girder System for the Sirius Machine	261
	M.C. Rocha, P.P.S. Freitas, T. Jasso, R. Junqueira Leão, A.L. Mesa, R.T. Neuenschwander, A.R.D. Rodrigues, F. Rodrigues LNLS, Campinas, Brazil
	Sirius is a 4th generation synchrotron light source under construction in Brazil, with a bare emittance of 250 picometer rad, scheduled to have the first beam late this year. One of the most important aspects for this ultra-low emittance machine is the stability of the components, especially the magnets. This paper describes the main characteristics of the girder system, including the concrete pedestal, the leveling units, the girder itself, the clamping mechanism for the magnets and the measurements procedures. Each detail was considered in the design phase and the result is a high rigidity setup with a first horizontal mode close to 170 Hz.
	Poster WEPH26 [1.313 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH26
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH29	NSLS-II Vibration Studies to Characterize Beamline Stability	267
	C.J. Spataro, F.C. Lincoln, S.K. Sharma BNL, Upton, Long Island, New York, USA
	High performance goals of NSLS-II require stringent mechanical stability of its instruments such as BPMs, slits, mirrors, monochromators, and detectors. Mechanical stability of these components can be compromised by site-wide as well as local vibration sources (pumps, compressors, etc.). Several vibration studies have been performed at NSLS-II at the request of beamline users. This paper presents the results of these studies highlighting sources of vibration and mitigation strategies.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH29
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

WEOAMA06

Concepts and Instrumentation for Scanning Free X-ray Emission Spectroscopy

D. Grötzsch, R.G. Gnewkow, B. Kanngießer, W. Malzer, C.S. Schlesiger
Technische Universität Berlin, Berlin, Germany
LC.A. Anklamm
Helmut Fischer GmbH, Sindelfingen, Germany
S.D. DeBeer, S.P. Peredkov
MPI CEC, Mülheim an der Ruhr, Germany

X-ray Emission spectroscopy is a common tool for the study of the electronic structure of chemical compounds*,** and a widely used technic at synchrotron facilities. There are two different principles. Johansson spectrometers with scanning excitation energy rely on highly precise motorized axes, whereas polychromatic Von Hamos spectrometers don't need the scanning modus. We present different von Hamos Spectrometer concepts and instruments dedicated for synchrotron and laboratory use. The presentation includes everything from the idea, planning, development, design and mounting to the commissioning, alignment and first operation. Furthermore we found a common solution for both different excitations, synchrotron and laboratory sources with respect to reliable energy alignment. The requirements to the mechanics, especially positioning devices which are both commercial and self-developed will also be explained.
*C.J. Pollock, S. DeBeer, Accounts of Chemical Research, 48, 2967, (2015)
**C.J. Pollock, M.U. Delgado-Jaime, M. Atanasov, F. Neese, S. DeBeer, J. of the American Chemical Society 136, 9453 (2014)

Slides WEOAMA06 [7.156 MB]

Export •

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

WEPH09

Vibrational Stability of a Cryocooled Double Crystal Monochromator at SSRF

220

Y. Fan, H.L. Qin
SSRF, Shanghai, People's Republic of China
Z. L. Li, F. Tao, W. Zhu
SINAP, Shanghai, People's Republic of China

There is an increasingly critical demand on the angular stability of double crystal monochromator (DCM). This work focuses on a method to measure angular vibration directly at the DCM crystals using a dual-frequency interferometer. This method was applied to the off-line test of a newly developed cryocooled DCM at Shanghai Syn-chrotron Radiation Facility (SSRF), which can obtain a resolution of 8 nrad. The DCM was then tested on the X-ray Test Line. Both off-line and on-line results were referenced for DCM structure optimizations. In this paper, the DCM angular stability measuring method is presented, and detailed information of the results are shown.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH09

Export •

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

WEPH13

Vibration Monitoring at TPS Storage Ring

227

K.H. Hsu, C.K. Kuan, W.Y. Lai, H.S. Wang
NSRRC, Hsinchu, Taiwan

In order to locate irregular vibrations caused by the installation of new equipment or malfunctioning of the machine, a vibration monitoring system was developed for the storage ring. Totally, 72 accelerometers and 10 velocity sensors were used to detect girder and ground vibrations, respectively. Continuous long-time observation results will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH13

Export •

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

WEPH15

Experimental Modal Analysis Vibration Measurement to Inform Engineering Design

235

J.H. Kelly
DLS, Oxfordshire, United Kingdom

Experimental Modal Analysis was performed on an existing 5 degree of freedom mirror system on beamline I08 at The Diamond Light Source, by impacting the structure and measuring the response at locations of interest. Commercial software was used to generate the frequency response functions and mode shape animations. This experimental information was used to inform and optimise a design iteration for a new mirror system. The new mechanism was designed, installed and tested on the J08 branch line at The Diamond Light Source to validate the expected improvements in stability, stiffness and resonant frequency. The mirror system fundamental resonant frequency was significantly increased from 20 Hz to 49 Hz.

Poster WEPH15 [0.411 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH15

Export •

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

WEPH18

Operation Status of HLS System Installed to Measure Ground Change of Large Scientific Equipment in Real Time

245

H. J. Choi, J.H. Han, H.-S. Kang, S.H. Kim, S.N. Kim, H.-G. Lee, S.B. Lee
PAL, Pohang, Kyungbuk, Republic of Korea

Several parts that comprise the large scientific equipment should be installed and operated at precise three-dimensional location coordinates X, Y, and Z through survey and alignment to ensure their optimal performance. As time goes by, however, the ground goes through uplift and subsidence, which consequently changes the coordinates of installed components and leads to alignment errors. As a result, the system parameters change, and the performance of the large scientific equipment deteriorates accordingly. Measuring the change in locations of systems comprising the large scientific equipment in real time would make it possible to predict alignment errors, locate any region with greater changes, realign components in the region fast, and shorten the time of survey and alignment. For this purpose, a WPS's (wire position sensor) are installed in undulator section and a HLS's (hydrostatic leveling sensor) are installed in PAL-XFEL building. This paper is designed to introduce performance enhancements to reduce observed phenomena and measurement errors in the HLS system operation process.

Poster WEPH18 [2.958 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH18

Export •

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

WEPH19

Positioning Behavior of a Lead-Screw Type In-Vacuum Actuator

L. Lee, D.S. Morton, M.L. Ng, L. Zhang
SLAC, Menlo Park, California, USA

In-vacuum actuators are under consideration for operating the bending flexturs of the new Kirkpatrick-Baez focusing mirrors as part of the upgrade to LCLS-II. To achieve an mechanical accuracy of better than 10⁴, the characteristics of the actuators need to be explored. We designed a testing procedure in terms of both setup and actuator excursion program to understand various behaviors of the actuator in a simulated typical operating condition. Multiple independent sensors were used, including optical linear encoder, laser interferometer and capacitive sensors. In this presentation, I will show the testing procedure and results obtained for a commercially available high-precision leadscrew type in-vacuum linear actuator with a stroke of 10 mm and a resolution of 2.5 nm. It was found that under typical static operation conditions, an accuracy of 10⁴ can be achieved without external encoder feedback. Detailed behaviors regarding repeatability and backlash are also discussed.

Export •

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

WEPH20

Upgrade of Double Crystal Monochromators for EMBL Beamlines at PETRAIII

F. Liu
ShanghaiTech University, Shanghai, People's Republic of China
Blanchet, C. Blanchet, G. Bourenkov, S. Fiedler, T. Gehrmann, D. Jahn, G. Marshall, Meyer, J. Meyer, G. Pompidor, U. Ristau
EMBL, Hamburg, Germany

Double crystal monochromators (DCM) are very important instruments in hard X-ray beamlines. Publications have indicated that the mechanical stability of the DCM would affect the whole beam quality very much. To upgrade the performance of the DCMs of the EMBL beamlines, the vibrational stability, thermal stability and mechanical repeatability were improved. To improve the vibrational stability, an off-line vibration measurement for the pitch and roll, as well as the perp, were designed with a set of in-vacuum interferometers was developed for measuring the vibrations without X-ray beam. Then several attempts were tried to reduce the vibration caused by the cooling system, in the end, the pitch vibration was improved from 390nrad to 50nrad. To improve the thermal stability, the cooling blocks and thermal braids were optimized with the FEA methods, the steady time of the 2nd crystal were improved from 2.5 hours to less than 45 minutes after each energy change. To improve the repeatability of the orientation, the wedge jacks were replaced by worm gear boxes, repeatability was reached to less than 3 um.

Export •

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

WEPH26

High Rigidity Girder System for the Sirius Machine

261

M.C. Rocha, P.P.S. Freitas, T. Jasso, R. Junqueira Leão, A.L. Mesa, R.T. Neuenschwander, A.R.D. Rodrigues, F. Rodrigues
LNLS, Campinas, Brazil

Sirius is a 4th generation synchrotron light source under construction in Brazil, with a bare emittance of 250 picometer rad, scheduled to have the first beam late this year. One of the most important aspects for this ultra-low emittance machine is the stability of the components, especially the magnets. This paper describes the main characteristics of the girder system, including the concrete pedestal, the leveling units, the girder itself, the clamping mechanism for the magnets and the measurements procedures. Each detail was considered in the design phase and the result is a high rigidity setup with a first horizontal mode close to 170 Hz.

Poster WEPH26 [1.313 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH26

Export •

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

WEPH29

NSLS-II Vibration Studies to Characterize Beamline Stability

267

C.J. Spataro, F.C. Lincoln, S.K. Sharma
BNL, Upton, Long Island, New York, USA

High performance goals of NSLS-II require stringent mechanical stability of its instruments such as BPMs, slits, mirrors, monochromators, and detectors. Mechanical stability of these components can be compromised by site-wide as well as local vibration sources (pumps, compressors, etc.). Several vibration studies have been performed at NSLS-II at the request of beamline users. This paper presents the results of these studies highlighting sources of vibration and mitigation strategies.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH29

Export •

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