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| MOEPPB011 | The Two Methods for Beam Profile Measurement of BEPCⅡ Storage Ring | synchrotron, monitoring, coupling, emittance | 100 |
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| The two method as spatial interferometor and visible light imaging for real time beam profile measurment for BEPCⅡ Storage Ring will be introduced in detail, including optical Magnification measurment, point spread function measurement, image reversion and spatial coherence measurment. the transverse emittance and copouling coefficient was gotten from the result of the beam profile monitor. | |||
| MOPPP003 | Comparison of Various Sources of Coherent THz Radiation at FLUTE | radiation, electron, synchrotron, linac | 568 |
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| The "Ferninfrarot Linac- Und Test-Experiment" FLUTE, based on a 50 MeV S-band linac with bunch compressor, is currently under construction at the KIT in Karlsruhe in order to study the production of coherent radiation in the Terahertz frequency range. The three photon generating mechanisms investigated in this paper are coherent synchrotron-, edge-, and transition radiation. For each case, we present the spectra and peak electric fields calculated from longitudinal charge distributions of a short, low charge and a long, high charge bunch. The respective bunch shapes are obtained by a detailed simulation (particle tracking) of FLUTE. We also give the expected temporal evolution of the electric field pulses. | |||
| MOPPP064 | Challenges of Quasiperiodic APPLE Undulators | undulator, lattice, polarization, synchrotron | 705 |
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| APPLE undulators have become workhorses in many synchrotron radiation facilities for the production of variably polarized light. In helical mode higher harmonics are not produced. In linear mode (horizontal, vertical, inclined) higher harmonics may contaminate the first harmonic and spoil the quality of experimental data. Planar undulators employing a quasiperiodic magnetic structure have been built and they are successfully operated at several places. The implementation of a quasiperiodic lattice in an APPLE undulator is more complicated since the device is operated in various modes of operation. The proposed APS-upgrade includes a quasiperiodic APPLE undulator which is intended to be operated in the range 2.4-27 keV. A detailed analysis of the magnetic and spectral performance of this device is presented. | |||
| MOPPP077 | Heat Load Budget on TPS Undulator in Vacuum | undulator, synchrotron, radiation, vacuum | 741 |
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| The performance of an insertion device is limited by the magnet gap because a small gap affects the dynamic aperture and results in a short life time of the beam. An in-vacuum undulator is designed to have no vacuum chamber between the magnet arrays so to allow the entire magnet gap to be fully used for the dynamic aperture. An in-vacuum undulator can optimally minimize the gap to achieve continuous energy spectra. One problem of an undulator with a small gap is resistive wall heating by the image current. The heat load depends strongly on the injected mode in the storage ring; injection of multiple bunches might deteriorate the thermal performance for the magnet array. In this paper, we present a calculation of the heat load budget for a magnet array of an in-vacuum undulator of Taiwan Photon Source (TPS). | |||
| MOPPR011 | A New Diagnostic Beamline at ELSA | synchrotron, radiation, diagnostics, electron | 795 |
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Funding: Funded by the DFG within the SFB / TR 16. At the Electron Stretcher Facility (ELSA), a new synchrotron light diagnostic Beamline has been installed in order to perform high resolution, transversal and longitudinal beam profile measurements by analyzing the emitted synchrotron light. For this purpose, the main deflecting AL mirror selects a wide range of wavelengths from 200–800 nm out of the whole synchrotron spectrum. The setup of the beamline and its relevant components will be presented. |
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| MOPPR050 | Design and Analysis of EPU XBPM in TPS | undulator, photon, synchrotron, radiation | 894 |
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| Several planer and elliptical polarized undulators (EPU) beam lines have been proposed and are to be built for Taiwan Photon Source (TPS) in National Synchrotron Research Center (NSRRC). Due to its complexity, with changing of vertical as well as horizontal deflection parameters (Kx and Ky), one finds that regular diamond bladed photon beam position monitor (XBPM) would not be sufficient to detect the center location of the undulator. A new conceptual design of EPU XBPM has been analyzed both in thermal as well as photon aspects. A prototype by taking advantage of fluorescent some of the diamond detectors has been designed and implemented in Taiwan Light Source (TLS) for testing. Some analysis and design scenarios are presented in this paper. | |||
| MOPPR079 | Horizontal Beam-size Measurements at CESR-TA Using Synchrotron-light Interferometer | emittance, synchrotron, scattering, lattice | 972 |
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Funding: DOE Award DE-FC02-08ER41538 NSF Award (PHY-0734867) NSF Award (PHY-1002467) NSF Award (PHY-1068662). A horizontal beam profile monitor utilizing visible synchrotron radiation from a bending magnet has been designed and installed in CESR. The monitor employs a double-slit interferometer which has been successfully implemented to measure horizontal beam sizes over a wide range of beam currents. By varying the separation of the slits, beam sizes ranging from 50 to 500 microns can be measured with a resolution of approximately 5 microns. The method for extracting the horizontal beam size from the interference pattern is presented and its application to intrabeam scattering studies is described. A configuration for measuring the small vertical beam size is also discussed. |
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| TUPPP010 | Spectral and Temporal Observations of CSR at ANKA | radiation, synchrotron, storage-ring, optics | 1623 |
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Funding: This work has been supported by the Initiative and Networking Fund of the Helmholtz Association under contract number VH-NG-320. ANKA is a synchrotron light source situated at the Karlsruhe Institute of Technology. Using dedicated low-α-optics at ANKA we can reduce the bunch length and generate Coherent Synchrotron Radiation (CSR). Studies of the coherent emission in the time domain allow us to gain an insight into the longitudinal bunch dynamics. These as well as the systematic investigations of the THz spectrum range can be used for benchmarking of theoretical predictions. In this paper we report about the recent progress in CSR observation using fast THz detectors and a Martin-Puplett spectrometer at the ANKA storage ring. |
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| TUPPP036 | Large-scale Simulation of Synchrotron Radiation using a Lienard-Wiechert Approach | radiation, simulation, electron, synchrotron | 1689 |
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Funding: DOE Office of Science, Office of Basic Energy Sciences; NNSA. Synchrotron radiation is one of the most important and difficult to model phenomena affecting lepton accelerators. Large-scale parallel modeling provides a means to explore properties of synchrotron radiation that would be impossible to study through analytical methods alone. We have performed first-principles simulations of synchrotron radiation, using a Lienard-Wiechert approach, with the same number of simulation particles as would be found in bunches with charge up to 1 nC. The results shed light on the importance of shot noise effects, the amplification of coherent synchrotron radiation due to longitudinal microbunching, the interplay of electric and magnetic forces, and the limits of the widely used one-dimensional model. |
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| TUPPR023 | Final-Focus Optics for the LHeC Electron Beam Line | synchrotron, radiation, quadrupole, electron | 1861 |
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Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu- CARD, grant agreement no. 227579. One of the options considered for the ECFA-CERN-NuPECC design study for a Large Hadron electron Collider (LHeC)* based on the LHC is adding a recirculating energy-recovery linac tangential to the LHC. First designs of the electron Final Focus System have shown the need to correct the chromatic aberrations. Two designs using different approaches for the chromaticity correction are compared, namely, the local chromaticity correction** and the traditional approach using dedicated sections. *LHeC Study Group, “A Large Hadron Electron Collider at CERN,” LHeC-Note 2011-001 (2011). **J. Abelleria et al., "Design Status of LHeC Linac‐Ring Interaction Region," IPAC2011, p. 2796 (2011). |
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| WEPPD003 | Development of a Condenser for the Helium Phase Separator at NSRRC | simulation, vacuum, cryogenics, synchrotron | 2501 |
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A helium phase separator with a condenser is under fabrication and assembly at National Synchrotron Radiation Research Center (NSRRC). The objective of a helium phase separator with its condenser is to separate two-phase helium flow and to re-condense vaporized gaseous helium with a cryo-cooler of Gifford-McMahon type. This paper presents the design and fabrication of the condenser, a key component of the helium phase separator. A preliminary steady-state simulation of the efficiency of the helium condenser is also presented.
"Condenser","Rate of condensation" |
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| WEPPD016 | Development of Glassy Carbon Blade for LHC Fast Vacuum Valve | vacuum, acceleration, kicker, synchrotron | 2528 |
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| An unexpected gas inrush in a vacuum chamber leads to the development of a fast pressure wave. It carries small particles that can compromise the functioning of sensitive machine systems such as the RF cavities or kickers. In the LHC machine, it has been proposed to protect these equipments by the installation of fast vacuum valves. The main requirements for the fast valves and in particular for the blade are: fast closure in the 20 ms range, high transparency and melting temperature in case of closure with beam in, dust free material to not contaminate sensitive adjacent elements and last but not least vacuum compatibility and adequate leak tightness across the blade. In this paper, a design based on a vitreous carbon blade is proposed. The main reasons for this material choice are given. The mechanical study of the blade behaviour under dynamic forces is shown. Fabrication considerations are addressed as well. Tests on prototypes have been carried out on pendulum type fast valves developed for LEP. Results on glassy carbon blades are presented as well as the motion parameter measurements. Qualification of the material for UHV applications has been carried out. | |||
| WEPPD019 | Manufacturing and Welding Process of Straight Section of Aluminum Alloy UHV Chambers for Taiwan Photon Source | vacuum, photon, synchrotron, radiation | 2537 |
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| This paper describes the manufacturing process and welding sequence for the aluminum extrusion vacuum chamber for the straight sections in Taiwan Photon Source. The straight section composes of aluminum extrusion chamber of A6063 and BPM chamber of A6061 aluminum alloys. The straightness and flatness of these extrusion chambers are controlled under 0.1mm/m and 0.2mm/m, respectively. The BPM chambers are manufactured precisely in oil-free environment, which provide clean surface and a precise sealing surface after machining. All the components are assembled in pre-aligned support system through the welding process. The aluminum chamber for 24 straight sections has been welded. The results show the straightness of < 0.15mm/m, flatness of < 0.3mm/m, and leakage rates of < 2 × 10-10 mbarl/sec. were achieved. | |||
| WEPPD040 | Power Saving Schemes in the NSRRC | controls, synchrotron, status, radiation | 2600 |
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| To cope with increasing power consumption and huge power bill of the Taiwan Photon Source (TPS) in the near future, we have been conducting several power saving schemes in the National Synchrotron Radiation Research Center (NSRRC) for years. This paper illustrates the power saving results and future schemes. The power saving schemes include optimization of chillers operation, power requirement control, air conditioning system improvement, application of heat pump, and the lighting system improvement. | |||
| THPPD063 | Zero Voltage Switching of Two-switch Flyback-Forward Converter | synchrotron, radiation, power-supply, photon | 3656 |
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| The traditional pulse-width-modulated flyback converter power switch has serious electromagnetic interference (EMI) and lower conversion efficiencies problems due to the hard-switching operations. This paper produces a zero voltage switching of flyback-forward converter with an active-clamp circuit, the traditional pulse-width-modulated flyback converter with a active clamp circuit to achieve zero-voltage-switching (ZVS) at both main and auxiliary switches, the active-clamp circuit can reduce most of switching loss and voltage spikes across the switches and improve the overall efficiency of the converter. The theoretical analysis of soft switching flyback-forward converter with an active-clamp circuit is verified exactly by a prototype of 50W with 100V input voltage, 5V output voltage and 30kHz operated frequency. | |||
| THPPR023 | Radiation Shielding Design for Dream-Line Beamline at SSRF | shielding, radiation, synchrotron, target | 4011 |
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The dream-line beamline at Shanghai Synchrotron Radiation Facility, SSRF, is an under construction soft X-ray beam line with a wide energy range and super high energy resolution. It is required to allow online operation beside optical components in the experiment hutch at this beamline when synchrotron light is running. This requires more careful radiation shielding design for the beamline. The radiation shielding designs for the beamline are considered to shield gas bremsstrahlung and synchrotron. Ray tracing was carried out according to the beamline structure and optical components layout. The residual gas bremsstrahlung with optical components and the induced dose rate distribution were simulated with the Fluka code. The synchrotron radiation scattering at optical components was calculated with the STAC08 code. With the simulated results, the specifications of shielding collimators, safety shutters, and hutch wall are given for the beamline. The normalized dose rate results by gas bremsstrahlung are consisted with the measurements or calculations results in other facilities in the world very well.
* Corresponding author: xiaxiaobin@sinap.ac.cn |
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