MEDSI2018 - List of Keywords (FEL)

Paper	Title	Other Keywords	Page
TUOPMA03	Development of the new UE38 Undulator for the Athos Beamline in SwissFEL	undulator, vacuum, laser, GUI	1
	H. Jöhri, M. Calvi, M. Hindermann, L. Huber, A. Keller, M. Locher, T. Schmidt, X. Wang PSI, Villigen PSI, Switzerland
	For the next beamline, we will profit from the experience of the U15 undulator development, but there are new requirements, because it will be a polarized undulator with a period of 38mm. We are developing a new arrangement of the drives, a further development of the magnet keepers and a vacuumpipe with only 0.2mm of wall thickness. A rough overview was given at Medsi 2016, together with the talk of the U15 Undulator. Meentime, the UE38 is in production and the talk will present the actual status and the lessons we learned during development and the fabrication: - Realization of vacuumchamber with 0.2mm wall thickness - Supportstructure for the vacuumchamber - Precision of manufacturing - Precision of assembling - Design of Magnetkeeper: Differential screw, forces, stiffness
	Slides TUOPMA03 [7.765 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUOPMA03
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TUPH16	Hammerhead Support Design and Application at SSRF	SRF, synchrotron, electron, radiation	60
	F. Gao, R.B. Deng, Z. Jiang, S. Xiang, L. Yin SINAP, Shanghai, People's Republic of China S.K. Sharma BNL, Upton, Long Island, New York, USA
	Electron beam stability is very important for Shanghai Synchrotron Radiation Facility(SSRF). One of the major players on beam stability is the vibration stability of magnet support systems. This paper describes several kinds of hammerhead magnet support prototypes with different structures, materials and ground fixation. Modal and response analyses of these prototypes are contrasted by finite-element analysis(FEA) and tests. The design can be applied to guide and improve the mechanical structures and the stability of magnet support systems at SSRF and other light source facilities.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH16
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TUPH37	A New Sealing Technology for High Precision Wide Open UHV Vacuum Flange and Waveguide Connections With Metal Gaskets	vacuum, diagnostics, laser, beam-diagnostic	125
	S. Vilcins, M. Holz DESY, Hamburg, Germany D.B. Bandke DESY Zeuthen, Zeuthen, Germany
	The European-XFEL X-Ray laser facility is located in Hamburg. Since its commissioning in September 2017, this large X-ray laser opens new research opportunities for industrial users and scientists. For many beam diagnostic devices ultra-high vacuum components with high mechanical precision and additional strict requirements on particle cleanliness were produced. A vacuum chamber for the bunch compressor (BC) with a cross section of 400 mm*40.5 mm made of stainless steel blocks 1.4429 (316 LN) has been installed. These chambers have inte-grated flange-connections for large VATSEAL® gaskets. The tolerances for these flanges are extremely tight to ensure save vacuum tight sealing. This contribution will report of a new technology for such large rectangular or other large flange surfaces. Furthermore this contribution will compare the present with this new technology. This new technology can be used as well for other vacuum flange metals like alumini-um or titanium. Using of this technology for applications under special conditions, like particle free applications due to the non-lubricated conditions, are conceivable.
	Poster TUPH37 [1.413 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH37
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TUPH39	The Design of LCLS-II Photon Beam Containment System	photon, synchrotron, experiment, operation	133
	H. Wang, Y. Feng, S. Forcat Oller, J. Krzywiński, E. Ortiz, M. Rowen SLAC, Menlo Park, California, USA
	LCLS-II will produce very powerful photon beams. Unlike conventional synchrotrons, the LCLS-II beam containment components withstand not only the high average beam power and power density, but also the instantaneous thermal shocks from pulsed FEL beam, which can reach ~9mJ/pulse. With beam repetition rate up to 1MHz, regular metal based beam collimators and absorbers will no longer work, because of the likelihood of fatigue failure. And because of the poor thermal conductivity, the old LCLS B4C based absorber would need very shallow glancing angle and take valuable beamline space. Hence, a low-Z and high thermal conductivity CVD diamond based photon beam collimator and absorber systems have been developed in LCSL-II. The initial damage tests using LCLS FEL beam provided positive results that graphite coated CVD diamond can endure per pulse dose level to ~0.5eV/atom. For the beamline and personnel safety, in addition to the passive CVD diamond collimators and absorbers, newly developed photon diode beam mis-steer detection systems and conventional SLAC pressurized burnt-through monitors have been also introduced in the photon beamline system design.
	Poster TUPH39 [1.251 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH39
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TUPH42	A Novel Attempt to Develop a Linear Polarization Adjustable Undulator Based on Magnetic Force Compensation Technology	undulator, polarization, radiation, SRF	140
	W. Zhang, Y. Zhu SINAP, Shanghai, People's Republic of China
	A linear polarization adjustable undulator is proposed in this paper. This undulator can reach 1.5T magnetic peak field with a period length 68mm and magnet length 4m. By adding two repulsive magnet arrays beside center array the magnetic force between girders can be reduced from 70kN to near zero. Such an approach can result in a significant reduction of the undulator volume, simplification of the strong back design and fabrication. By means of rotating through the center of undulator we can achieve magnetic field from vertical orientation to horizontal orientation. The linear polarization of radiation can be adjusted between zero and 90 degree
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH42
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WEOPMA03	Application of Additive Manufacturing in the Development of a Sample Holder for a Fixed Target Vector Scanning Diffractometer at SwissFEL	site, acceleration, target, simulation	158
	X. Wang, P. Hirschi, J. Hora, H. Jöhri, B. Pedrini, C. Pradervand PSI, Villigen PSI, Switzerland
	Whilst the benefit of additive manufacturing (AM) in rapid prototyping becomes more and more established, the direct application of 3D printed part is still demanding. Exploitation of AM opens the door for complex and optimized parts which are otherwise impossible to fabricate. In the meanwhile, specific knowledge and aspects in analysis and design process are still to be explored. For a fixed target vector scanning diffractometer [1] at SwissFEL we developed, manufactured and tested a 3D-printed sample holder with carbon fiber reinforced plastics material. The diffractometer for serial crystallography is dedicated to collect diffraction patterns at up to 100 Hz on many small crystals (< 5 µm) by scanning the sample support in a continuous, arbitrary motion. The high dynamics arising from curved trajectories in the xy-plane requires a light and stiff sample holder which attaches the sample to the stage. In addition to 3D printed parts, an aluminum counterpart produced by CNC machining has also been tested and carefully evaluated. Our work in the course of development process on topology optimization, design, manufacturing and dynamic verification tests will be presented. [1] C. Pradervand et al., SwissMX: Fixed Target vector scanning diffractometer for Serial Crystallography at SwissFEL, SRI 2018
	Slides WEOPMA03 [6.670 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOPMA03
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WEOPMA06	A Compact and Calibratable von Hamos X-Ray Spectrometer Based on Two Full-Cylinder HAPG Mosaic Crystals for High-Resolution XES	optics, GUI, radiation, experiment	189
	I. Holfelder, B. Beckhoff, R. Fliegauf, Y. Kayser, M. Müller, M. Wansleben, J. Weser PTB, Berlin, Germany
	In high-resolution X-ray Emission Spectroscopy (XES) crystal-based Wavelength-Dispersive Spectrometers (WDS) are being applied for characterization of nano- and microscaled materials. Thereby the so called von Hamos geometry provides high detection efficiency due to sagittal focusing using cylindrically bent crystals. To maximize the detection efficiency a full-cylinder optic can be applied. A novel calibratable von Hamos X-ray spectrometer based on up to two full-cylinder optics was developed at the PTB. To realize the full-cylinder geometry Highly Annealed Pyrolytic Graphite (HAPG) [1] was used. Besides its good bending properties this mosaic crystal shows highly integrated reflectivity while offering low mosaicity ensuring high resolving power [2]. The spectrometer enables chemical speciation of elements in an energy range from 2.4 keV up to 18 keV. The design and commissioning of the spectrometer will be presented together with first results using synchrotron radiation as excitation source. The spectrometer combines high efficiency with high spectral resolution (ten times better than in commercial WDS systems) in a compact arrangement also suitable for laboratory arrangements. [1] H. Legall et al. (2006). Proc. FEL, BESSY FRAAU04, 798-801 [2] M. Gerlach et al. (2015). J. Appl. Cryst. 48, 2015, 1381-1390
	Slides WEOPMA06 [7.630 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOPMA06
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WEPH17	Adjusting Mechanism of Inter-Undulator Section for PAL XFEL	undulator, cavity, quadrupole, controls	241
	H.-G. Lee, J.H. Han, S.-H. Jeong, Y.G. Jung, H.-S. Kang, D.E. Kim, H.-S. Lee, S.B. Lee, B.G. Oh, K.-H. Park, H.S. Suh PAL, Pohang, Kyungbuk, Republic of Korea
	Pohang Accelerator Laboratory (PAL) has developed a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. The inter-Undulator (IU) support section was developed to be used in the intersections of the Undulator Systems. The IU supports consist of phase shifter, quadrupole magnet with mover, beam loss monitor, cavity BPM with mover, two corrector magnets and vacuum components. The adjusting mechanism of IU Support has manual alignment system to be easily adjusting the component. The mover of quadruple magnet and cavity BPM with submicron repeatability has auto-adjusting systems with stepping motor. The mover main specifications include compact dimensions and a ±1.5 mm stroke in the vertical and horizontal direction. Linear motion guide based on 5-phase stepping motors have been chosen. This paper describes the design of the stages used for precise movement and results of mechanical measurements including reproducibility will be reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH17
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WEPH18	Operation Status of HLS System Installed to Measure Ground Change of Large Scientific Equipment in Real Time	alignment, linac, real-time, survey	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
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THPH02	LCLS Pulse Selector, A Multifunction Shutter for the LCLS-I 120 Hz FEL	controls, timing, operation, MMI	336
	R. Armenta, E.A. Paiser SLAC, Menlo Park, California, USA
	The LCLS Pulse Selector was designed to pick specific pulses and reduce the repetition rate of the 120Hz LCLS pulse train in support of widely diverse, user defined experiments. It utilizes two rotating parallel plates to alternately transmit and block pulses in a single sweeping motion. A conventional stepper motor connected to the plates provides the rotation. The key to the system is its sophisticated timing scheme. Each sweep of the shutter is synchronized (with a precise delay) with the event codes normally generated with each pulse for data acquisition use. This shutter system has the capability of reducing the repetition rate of the LCLS x-ray to any frequency less than or equal to 60Hz in order to select a single pulse of LCLS x-ray beam at 120Hz. Since its installation, the pulse selector has been used in multiple experiments with great success providing independent pulse selection to individual beamlines at the same time.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THPH02
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THPH11	LCLS-II FEL Photon Collimators Design	photon, linac, undulator, laser	358
	S. Forcat Oller, Y. Feng, J. Krzywiński, E. Ortiz, M. Rowen, H. Wang SLAC, Menlo Park, California, USA
	The unique capabilities of LCLS, the world's first hard X-ray FEL, have had significant impact on advancing our understanding across a broad range of science. LCLS-II, a major upgrade of LCLS, is being developed as a high-repetition rate X-ray laser with two simultaneously operating FELs. It features a 4 GeV continuous wave superconducting Linac capable of producing ultrafast X-ray laser pulses at a repetition rate up to 1 MHz and energy range from 0.25 to 5 keV. The LCLS-II upgrade is an enormous engineering challenge not only on the accelerator side but also for safety, machine protection devices and diagnostic units. A major part of the beam containment is covered by the FEL beam collimators. The current collimator design is no longer suitable for the high power densities of the upcoming LCLS-II beam. Therefore, a complete new design has been conceived to satisfy this new constrains. Moreover, a special FEL miss-steering detection system based on a photo diodes array has been designed as an integral part of the photon collimator as additional safety feature. This poster describes the new LCLS-II FEL Collimators, their mechanical design and challenges encountered.
	Poster THPH11 [1.164 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THPH11
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THPH19	Engineering Design of the XPD & PDF Beamline Sample Environment for Safe Experimental Use of Hazardous Gases	experiment, operation, controls, GUI	379
	E. Haas, M. Abeykoon, S. Buda, E.D. Dooryhee, S. Ghose, C. Stelmach, J.T. Trunk BNL, Upton, Long Island, New York, USA
	Funding: U.S. Department of Energy The X-ray Powder Diffraction (XPD) and Pair Distribution Function (PDF) beamlines located at the 28-ID beam port at NSLS-II require a means for safely supplying, containing, and exhausting hazardous gases to and from experimental samples. These beamlines plan to use a wide range of flammable, toxic, and reactive gases for in-situ studies of catalytic and chemical reactions. Since many of the gases are hazardous, a low-cost, robust means is needed to safely supply gases to samples, position the samples quickly, accurately, and remotely, collect scattered X-rays over a wide-angle without distortion, and exhaust the gases safely. Ideally, the sample environment should also allow rapid sample set-up and change-out. The PDF/XPD system includes a sample holder, internal beam stop, sample chamber, and stages that provide eight degrees of freedom. A specially-designed window is also included for maximum X-ray transmission at minimum cost. Sensors, flow metering devices, and circuitry are included to provide proper purging, control hazardous and dilution gas flows, and integrate all of the safeguards needed to assure safe operation. Note to MEDSI reviewers: "Contributed Oral" presentation is indicated above, however a poster presentation can be generated by contacting the author via email at haas@bnl.gov if this is preferred.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THPH19
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THPH28	The Development of PAL-XFEL Beamline	experiment, detector, vacuum, electron	397
	S.H. Kim, I. Eom, S-M. Hwang, H.J. Hyun, K.S. Kim, M-J. Kim, S. Kim, S.N. Kim, S. Kim, C. Lee, G.S. Park, J. Park, J.K. Park, S.Y. Rah PAL, Pohang, Republic of Korea
	Pohang Accelerator Laboratory X-ray Free Electron Laser(PAL-XFEL) is a research facility, which is designed to generate extremely intense (assuming 1x10¹² photon/pulse at 12.4 keV) and ultra-short (10-200 femtosecond) pulsed X-rays. Now two beamlines were constructed, the one is hard X-ray and the other is soft X-ray. The beamline is consist of UH (Undulator hall) and OH (Optical hall), EH (Experimental hall). The UH is usually the same as the front end of a beamline, and OH has the same function as PTL (Photon Transfer Line). We have two hutches including HXPP and HCXI in hard X-ray beamline. The two hutches are connected each other, and sharing main optics (Mirrors and DCM, etc). PAL-XFEL is a very precise facility and has very large heat power, so thermal and structural analysis as well as vibration analysis is essential. Now many vacuum components of beamline were installed and completed the test of performance.
	Poster THPH28 [1.888 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THPH28
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THPH38	Design & Development of an Innovative 6 Axis Sample Manipulator.	experiment, shielding, vacuum, ISOL	415
	M.F. Purling DLS, Oxfordshire, United Kingdom
	The accurate positioning & alignment of sample specimens within the experimental test chamber on a beam line is always a challenge. The ability to move in any direction and angle to very precise increments with repeatable positioning is crucial for being able to focus on the exact part of the sample required in the correct orientation. It can be made even more difficult when the sample is required to work within the UHV vacuum environment and be cooled to cryogenic temperatures. Initially in conjunction with St Andrews University, Diamond Light Source Ltd. have been developing their own manipulator for this purpose, it has six degrees of freedom for alignment of the sample and easy remote sample plate loading via a transfer arm system. This paper describes the developments made from the initial design to working manipulators with increased functionality for bespoke requirements on four different beamline within Diamond.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THPH38
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Paper

Title

Other Keywords

Page

TUOPMA03

Development of the new UE38 Undulator for the Athos Beamline in SwissFEL

undulator, vacuum, laser, GUI

1

H. Jöhri, M. Calvi, M. Hindermann, L. Huber, A. Keller, M. Locher, T. Schmidt, X. Wang
PSI, Villigen PSI, Switzerland

For the next beamline, we will profit from the experience of the U15 undulator development, but there are new requirements, because it will be a polarized undulator with a period of 38mm. We are developing a new arrangement of the drives, a further development of the magnet keepers and a vacuumpipe with only 0.2mm of wall thickness. A rough overview was given at Medsi 2016, together with the talk of the U15 Undulator. Meentime, the UE38 is in production and the talk will present the actual status and the lessons we learned during development and the fabrication: - Realization of vacuumchamber with 0.2mm wall thickness - Supportstructure for the vacuumchamber - Precision of manufacturing - Precision of assembling - Design of Magnetkeeper: Differential screw, forces, stiffness

Slides TUOPMA03 [7.765 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUOPMA03

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TUPH16

Hammerhead Support Design and Application at SSRF

SRF, synchrotron, electron, radiation

60

F. Gao, R.B. Deng, Z. Jiang, S. Xiang, L. Yin
SINAP, Shanghai, People's Republic of China
S.K. Sharma
BNL, Upton, Long Island, New York, USA

Electron beam stability is very important for Shanghai Synchrotron Radiation Facility(SSRF). One of the major players on beam stability is the vibration stability of magnet support systems. This paper describes several kinds of hammerhead magnet support prototypes with different structures, materials and ground fixation. Modal and response analyses of these prototypes are contrasted by finite-element analysis(FEA) and tests. The design can be applied to guide and improve the mechanical structures and the stability of magnet support systems at SSRF and other light source facilities.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH16

Export •

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

TUPH37

A New Sealing Technology for High Precision Wide Open UHV Vacuum Flange and Waveguide Connections With Metal Gaskets

vacuum, diagnostics, laser, beam-diagnostic

125

S. Vilcins, M. Holz
DESY, Hamburg, Germany
D.B. Bandke
DESY Zeuthen, Zeuthen, Germany

The European-XFEL X-Ray laser facility is located in Hamburg. Since its commissioning in September 2017, this large X-ray laser opens new research opportunities for industrial users and scientists. For many beam diagnostic devices ultra-high vacuum components with high mechanical precision and additional strict requirements on particle cleanliness were produced. A vacuum chamber for the bunch compressor (BC) with a cross section of 400 mm*40.5 mm made of stainless steel blocks 1.4429 (316 LN) has been installed. These chambers have inte-grated flange-connections for large VATSEAL® gaskets. The tolerances for these flanges are extremely tight to ensure save vacuum tight sealing. This contribution will report of a new technology for such large rectangular or other large flange surfaces. Furthermore this contribution will compare the present with this new technology. This new technology can be used as well for other vacuum flange metals like alumini-um or titanium. Using of this technology for applications under special conditions, like particle free applications due to the non-lubricated conditions, are conceivable.

Poster TUPH37 [1.413 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH37

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TUPH39

The Design of LCLS-II Photon Beam Containment System

photon, synchrotron, experiment, operation

133

H. Wang, Y. Feng, S. Forcat Oller, J. Krzywiński, E. Ortiz, M. Rowen
SLAC, Menlo Park, California, USA

LCLS-II will produce very powerful photon beams. Unlike conventional synchrotrons, the LCLS-II beam containment components withstand not only the high average beam power and power density, but also the instantaneous thermal shocks from pulsed FEL beam, which can reach ~9mJ/pulse. With beam repetition rate up to 1MHz, regular metal based beam collimators and absorbers will no longer work, because of the likelihood of fatigue failure. And because of the poor thermal conductivity, the old LCLS B4C based absorber would need very shallow glancing angle and take valuable beamline space. Hence, a low-Z and high thermal conductivity CVD diamond based photon beam collimator and absorber systems have been developed in LCSL-II. The initial damage tests using LCLS FEL beam provided positive results that graphite coated CVD diamond can endure per pulse dose level to ~0.5eV/atom. For the beamline and personnel safety, in addition to the passive CVD diamond collimators and absorbers, newly developed photon diode beam mis-steer detection systems and conventional SLAC pressurized burnt-through monitors have been also introduced in the photon beamline system design.

Poster TUPH39 [1.251 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH39

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TUPH42

A Novel Attempt to Develop a Linear Polarization Adjustable Undulator Based on Magnetic Force Compensation Technology

undulator, polarization, radiation, SRF

140

W. Zhang, Y. Zhu
SINAP, Shanghai, People's Republic of China

A linear polarization adjustable undulator is proposed in this paper. This undulator can reach 1.5T magnetic peak field with a period length 68mm and magnet length 4m. By adding two repulsive magnet arrays beside center array the magnetic force between girders can be reduced from 70kN to near zero. Such an approach can result in a significant reduction of the undulator volume, simplification of the strong back design and fabrication. By means of rotating through the center of undulator we can achieve magnetic field from vertical orientation to horizontal orientation. The linear polarization of radiation can be adjusted between zero and 90 degree

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH42

Export •

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

WEOPMA03

Application of Additive Manufacturing in the Development of a Sample Holder for a Fixed Target Vector Scanning Diffractometer at SwissFEL

site, acceleration, target, simulation

158

X. Wang, P. Hirschi, J. Hora, H. Jöhri, B. Pedrini, C. Pradervand
PSI, Villigen PSI, Switzerland

Whilst the benefit of additive manufacturing (AM) in rapid prototyping becomes more and more established, the direct application of 3D printed part is still demanding. Exploitation of AM opens the door for complex and optimized parts which are otherwise impossible to fabricate. In the meanwhile, specific knowledge and aspects in analysis and design process are still to be explored. For a fixed target vector scanning diffractometer [1] at SwissFEL we developed, manufactured and tested a 3D-printed sample holder with carbon fiber reinforced plastics material. The diffractometer for serial crystallography is dedicated to collect diffraction patterns at up to 100 Hz on many small crystals (< 5 µm) by scanning the sample support in a continuous, arbitrary motion. The high dynamics arising from curved trajectories in the xy-plane requires a light and stiff sample holder which attaches the sample to the stage. In addition to 3D printed parts, an aluminum counterpart produced by CNC machining has also been tested and carefully evaluated. Our work in the course of development process on topology optimization, design, manufacturing and dynamic verification tests will be presented.
[1] C. Pradervand et al., SwissMX: Fixed Target vector scanning diffractometer for Serial Crystallography at SwissFEL, SRI 2018

Slides WEOPMA03 [6.670 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOPMA03

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WEOPMA06

A Compact and Calibratable von Hamos X-Ray Spectrometer Based on Two Full-Cylinder HAPG Mosaic Crystals for High-Resolution XES

optics, GUI, radiation, experiment

189

I. Holfelder, B. Beckhoff, R. Fliegauf, Y. Kayser, M. Müller, M. Wansleben, J. Weser
PTB, Berlin, Germany

In high-resolution X-ray Emission Spectroscopy (XES) crystal-based Wavelength-Dispersive Spectrometers (WDS) are being applied for characterization of nano- and microscaled materials. Thereby the so called von Hamos geometry provides high detection efficiency due to sagittal focusing using cylindrically bent crystals. To maximize the detection efficiency a full-cylinder optic can be applied. A novel calibratable von Hamos X-ray spectrometer based on up to two full-cylinder optics was developed at the PTB. To realize the full-cylinder geometry Highly Annealed Pyrolytic Graphite (HAPG) [1] was used. Besides its good bending properties this mosaic crystal shows highly integrated reflectivity while offering low mosaicity ensuring high resolving power [2]. The spectrometer enables chemical speciation of elements in an energy range from 2.4 keV up to 18 keV. The design and commissioning of the spectrometer will be presented together with first results using synchrotron radiation as excitation source. The spectrometer combines high efficiency with high spectral resolution (ten times better than in commercial WDS systems) in a compact arrangement also suitable for laboratory arrangements.
[1] H. Legall et al. (2006). Proc. FEL, BESSY FRAAU04, 798-801
[2] M. Gerlach et al. (2015). J. Appl. Cryst. 48, 2015, 1381-1390

Slides WEOPMA06 [7.630 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOPMA06

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WEPH17

Adjusting Mechanism of Inter-Undulator Section for PAL XFEL

undulator, cavity, quadrupole, controls

241

H.-G. Lee, J.H. Han, S.-H. Jeong, Y.G. Jung, H.-S. Kang, D.E. Kim, H.-S. Lee, S.B. Lee, B.G. Oh, K.-H. Park, H.S. Suh
PAL, Pohang, Kyungbuk, Republic of Korea

Pohang Accelerator Laboratory (PAL) has developed a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. The inter-Undulator (IU) support section was developed to be used in the intersections of the Undulator Systems. The IU supports consist of phase shifter, quadrupole magnet with mover, beam loss monitor, cavity BPM with mover, two corrector magnets and vacuum components. The adjusting mechanism of IU Support has manual alignment system to be easily adjusting the component. The mover of quadruple magnet and cavity BPM with submicron repeatability has auto-adjusting systems with stepping motor. The mover main specifications include compact dimensions and a ±1.5 mm stroke in the vertical and horizontal direction. Linear motion guide based on 5-phase stepping motors have been chosen. This paper describes the design of the stages used for precise movement and results of mechanical measurements including reproducibility will be reported.

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH17

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WEPH18

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

alignment, linac, real-time, survey

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]

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

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THPH02

LCLS Pulse Selector, A Multifunction Shutter for the LCLS-I 120 Hz FEL

controls, timing, operation, MMI

336

R. Armenta, E.A. Paiser
SLAC, Menlo Park, California, USA

The LCLS Pulse Selector was designed to pick specific pulses and reduce the repetition rate of the 120Hz LCLS pulse train in support of widely diverse, user defined experiments. It utilizes two rotating parallel plates to alternately transmit and block pulses in a single sweeping motion. A conventional stepper motor connected to the plates provides the rotation. The key to the system is its sophisticated timing scheme. Each sweep of the shutter is synchronized (with a precise delay) with the event codes normally generated with each pulse for data acquisition use. This shutter system has the capability of reducing the repetition rate of the LCLS x-ray to any frequency less than or equal to 60Hz in order to select a single pulse of LCLS x-ray beam at 120Hz. Since its installation, the pulse selector has been used in multiple experiments with great success providing independent pulse selection to individual beamlines at the same time.

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THPH11

LCLS-II FEL Photon Collimators Design

photon, linac, undulator, laser

358

S. Forcat Oller, Y. Feng, J. Krzywiński, E. Ortiz, M. Rowen, H. Wang
SLAC, Menlo Park, California, USA

The unique capabilities of LCLS, the world's first hard X-ray FEL, have had significant impact on advancing our understanding across a broad range of science. LCLS-II, a major upgrade of LCLS, is being developed as a high-repetition rate X-ray laser with two simultaneously operating FELs. It features a 4 GeV continuous wave superconducting Linac capable of producing ultrafast X-ray laser pulses at a repetition rate up to 1 MHz and energy range from 0.25 to 5 keV. The LCLS-II upgrade is an enormous engineering challenge not only on the accelerator side but also for safety, machine protection devices and diagnostic units. A major part of the beam containment is covered by the FEL beam collimators. The current collimator design is no longer suitable for the high power densities of the upcoming LCLS-II beam. Therefore, a complete new design has been conceived to satisfy this new constrains. Moreover, a special FEL miss-steering detection system based on a photo diodes array has been designed as an integral part of the photon collimator as additional safety feature. This poster describes the new LCLS-II FEL Collimators, their mechanical design and challenges encountered.

Poster THPH11 [1.164 MB]

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THPH19

Engineering Design of the XPD & PDF Beamline Sample Environment for Safe Experimental Use of Hazardous Gases

experiment, operation, controls, GUI

379

E. Haas, M. Abeykoon, S. Buda, E.D. Dooryhee, S. Ghose, C. Stelmach, J.T. Trunk
BNL, Upton, Long Island, New York, USA

Funding: U.S. Department of Energy
The X-ray Powder Diffraction (XPD) and Pair Distribution Function (PDF) beamlines located at the 28-ID beam port at NSLS-II require a means for safely supplying, containing, and exhausting hazardous gases to and from experimental samples. These beamlines plan to use a wide range of flammable, toxic, and reactive gases for in-situ studies of catalytic and chemical reactions. Since many of the gases are hazardous, a low-cost, robust means is needed to safely supply gases to samples, position the samples quickly, accurately, and remotely, collect scattered X-rays over a wide-angle without distortion, and exhaust the gases safely. Ideally, the sample environment should also allow rapid sample set-up and change-out. The PDF/XPD system includes a sample holder, internal beam stop, sample chamber, and stages that provide eight degrees of freedom. A specially-designed window is also included for maximum X-ray transmission at minimum cost. Sensors, flow metering devices, and circuitry are included to provide proper purging, control hazardous and dilution gas flows, and integrate all of the safeguards needed to assure safe operation.
Note to MEDSI reviewers:
"Contributed Oral" presentation is indicated above, however a poster presentation can be generated by contacting the author via email at haas@bnl.gov if this is preferred.

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THPH28

The Development of PAL-XFEL Beamline

experiment, detector, vacuum, electron

397

S.H. Kim, I. Eom, S-M. Hwang, H.J. Hyun, K.S. Kim, M-J. Kim, S. Kim, S.N. Kim, S. Kim, C. Lee, G.S. Park, J. Park, J.K. Park, S.Y. Rah
PAL, Pohang, Republic of Korea

Pohang Accelerator Laboratory X-ray Free Electron Laser(PAL-XFEL) is a research facility, which is designed to generate extremely intense (assuming 1x10¹² photon/pulse at 12.4 keV) and ultra-short (10-200 femtosecond) pulsed X-rays. Now two beamlines were constructed, the one is hard X-ray and the other is soft X-ray. The beamline is consist of UH (Undulator hall) and OH (Optical hall), EH (Experimental hall). The UH is usually the same as the front end of a beamline, and OH has the same function as PTL (Photon Transfer Line). We have two hutches including HXPP and HCXI in hard X-ray beamline. The two hutches are connected each other, and sharing main optics (Mirrors and DCM, etc). PAL-XFEL is a very precise facility and has very large heat power, so thermal and structural analysis as well as vibration analysis is essential. Now many vacuum components of beamline were installed and completed the test of performance.

Poster THPH28 [1.888 MB]

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THPH38

Design & Development of an Innovative 6 Axis Sample Manipulator.

experiment, shielding, vacuum, ISOL

415

M.F. Purling
DLS, Oxfordshire, United Kingdom

The accurate positioning & alignment of sample specimens within the experimental test chamber on a beam line is always a challenge. The ability to move in any direction and angle to very precise increments with repeatable positioning is crucial for being able to focus on the exact part of the sample required in the correct orientation. It can be made even more difficult when the sample is required to work within the UHV vacuum environment and be cooled to cryogenic temperatures. Initially in conjunction with St Andrews University, Diamond Light Source Ltd. have been developing their own manipulator for this purpose, it has six degrees of freedom for alignment of the sample and easy remote sample plate loading via a transfer arm system. This paper describes the developments made from the initial design to working manipulators with increased functionality for bespoke requirements on four different beamline within Diamond.

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