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| MOPC005 | The ARC-EN-CIEL Radiation Sources | radiation, undulator, electron, laser | 73 | |||||
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The ARC-EN-CIEL project proposes a panoply of light sources for the scientific community on a 1 GeV superconducting LINAC (phase 2) on which two ERL loops (1 and 2 GeV) are added in phase 3. LEL1 (200-1.5 nm), LEL2 (10-0.5 nm) and LEL4 (2-0.2 nm) are three kHz High Gain Harmonic Generation Free Electron Laser sources seeded with the High order Harmonics generated in Gas, with 100-30 FWHM pulses. A collaboration, which has been set-up with the SCSS Prototype Accelerator in Japan for test this key concept of ARC-EN-CIEL, has led to the experimental demonstration of the seeding with HHG and the observation up the 7th non linear harmonic with a seed at 160 nm. Besides. LEL3 (40-8 nm) installed on the 1 GeV loop is a MHz FEL oscillator providing higher average power and brilliance. In addition, in vacuum undulator spontaneous emission source extend the spectral range above 10 keV and intense THz radiation is generated by edge radiation of bending magnets. Optimisations and light sources characteristics are described.
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| TUXM02 | Performance and Trends of Storage Ring Light Sources | emittance, storage-ring, photon, radiation | 993 | |||||
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We present an overview of the performance of the latest generation of operating storage ring light sources. Emphasis is given to the comparison of design parameters to the achieved performances. Trends and innovations of established light sources to meet the increasing user’s demand for high brightness and different time structures will be presented. Report on upgrades and improvements will be given including orbit stability, top-up, feedback systems, lower-ID gap operation and a review of the activities for the generation of ultra-short radiation pulses in storage rings.
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| TUPC003 | Libera Grouping: Reducing the Data Encapsulation Overhead | feedback, controls, monitoring, instrumentation | 1041 | |||||
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Libera Brilliance is a precision digital Beam Position Monitor, a building block for modern fast orbit feedback systems. Gigabit Ethernet and UDP/IP protocol are used as a standard data link for real-time beam position signal transmission to the central fast feedback CPU engines. While the UDP/IP over Gigabit Ethernet provides a standardized and proven solution that enables the utilization of COTS components, the UDP and IP protocols are subject to a large data encapsulation overhead, since the beam position data payload is relatively small. To overcome this, several Libera Brilliance units (up to 16) have been grouped together in a redundant private network via the LC optical links and/or copper “Molex” cables. The purpose of the private network is to exchange the data among the Libera Brilliance units without the protocol overhead and send the gathered data via Gigabit Ethernet. Any of the Libera Brilliance units in a group can act as a Gigabit Ethernet group transmitter. The private network is redundant and can survive a single cable failure. The data encapsulation overhead has been significantly reduced. Libera Grouping is being tested at NSRRC, Taiwan.
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| WEXM01 | Overview of VUV and Soft X-Ray FELs Worldwide | photon | 1938 | |||||
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A comprehensive overview of the status of FEL projects worldwide providing photons in the VUV to soft X-ray region. The paper should give an update of projects, the technolgies proposed and methods for stable high brilliance user beams. Seeding schemes should be discussed along with critical issues for reaching the shorter wavelengths.
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| WEPC013 | Commissioning of Medium Emittance Lattice of HLS Storage Ring | emittance, radiation, lattice, focusing | 2013 | |||||
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Hefei Light Source (HLS) is a second generation light source, whose emittance is about 160 nmrad in normal optics. Lowering beam emittance is the most effective measure to enhance light source brilliance. Considering beam lifetime limitation, a lattice with medium beam emittance was brought forward. Through distributed dispersion in straight section, the beam emittance was reduced to 80 nmrad. At same time, the betatron tunes were kept same as before. In this way, the focusing parameters can be tuned to new one smoothly. With the new lattice parameters, the brilliance of HLS is increased by two factors.
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| WEPC099 | A Superconductive Undulator for the Munich Laser-plasma Accelerator | undulator, electron, radiation, photon | 2228 | |||||
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Laser-plasma accelerators are expected to produce electron beams with bunch charges in the nano-Coulomb range with energies in the GeV range. By employing short-period superconductive undulators this may be utilized for the generation of undulator radiation in the X-ray regime with a compact laboratory-sized set up. In this contribution we report on the project of testing this concept at the Laser-Plasma Accelerator in Munich. A particular aim of this project is to push the superconductive undulator technology to shortest periods and highest on-axis fields at gap widths sufficiently large to reduce the impact of resistive wall wake fields on the electron beam. This might open a path to the generation of coherent radiation via the SASE process.
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| WEPC100 | Superconducting Insertion Devices with Variable Period Length | undulator, wiggler, photon, insertion | 2231 | |||||
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The tuning range and functionality of superconducting insertion devices may be significantly enhanced by period length switching. Period length switching can be achieved by employing two or more individually powerable subsets of superconducting coils in such a way that a current reversal in a part of these coil sets results in a period length variation. In this paper the opportunities and restrictions of period length switching in superconducting undulators are discussed from a general point of view. As a particular example, the design of a hybrid superconducting undulator/wiggler (SCUW) for ANKA based upon the period length switching technique is presented.
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| THXM03 | Status of the European HOM Damped Normal Conducting Cavity | impedance, vacuum, simulation, damping | 2932 | |||||
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Cavities with damped higher order modes (HOMs) are an essential ingredient for state of the art storage ring based high brilliance synchrotron radiation sources to avoid degradation of the beam quality due to coupled bunch instabilities. Starting with a review of the concepts of existing HOM damped cavities the status of a normal conducting 500 MHz cavity is presented which has been developed for low and medium energy high brilliance synchrotron light sources within the frame of an EC funded collaboration. The results of numerical simulations and of low power impedance measurements are reported together with conceptional improvements, expected performance, and first operational achievements in the Metrology Light Source in Berlin.
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| THPC119 | Progress of TLS Fast Orbit Feedback System and Orbit Stability Studies | feedback, power-supply, controls, simulation | 3260 | |||||
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The orbit feedback system of the TLS has been deployed for a decade and continuously upgraded. However, due to limitation of the existing hardware, the system cannot remove orbit excursion caused by the perturbation due to fast operation of insertion devices. The newly proposed orbit feedback system with the upgraded digital BPM system and switching corrector power supply system is planned to be installed and commissioned in late 2008. The preliminary calculation on the stability performance for the orbit feedback system is presented in the report. New fast orbit feedback system can be expected to achieve a submicron stability of the electron beam working at a bandwidth of at least 60 Hz.
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| THPC130 | Integrated Global Orbit Feedback with Slow and Fast Correctors | feedback, power-supply, emittance, storage-ring | 3292 | |||||
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The NSLS-II Light Source which is planned to be built at Brookhaven National Laboratory will provide users with ultra-bright synchrotron radiation sources and is designed for horizontal beam emittances <1 nm. Full utilization of the very small emittances and beam sizes requires sub-micron orbit stability in the storage ring. This can be provided by means of a wide bandwidth orbit feedback system. Traditional approach is to utilize a uniform set of fast correctors or use two separate systems with strong slow and weaker fast correctors. In the latter case two systems need to communicate to suppress transients associated with different update rates of corrector settings. In this paper we consider an integrated system with two types of correctors. Its main feature is that setpoints of slow correctors are updated with the same rate as fast correctors; however the bandwidth is limited in order to stay in linear regime. Possible architectures and technical solutions as well as achievable performance are discussed.
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| THPC148 | Interlock – the Machine Protection Function of Libera Brilliance | instrumentation, electron, pick-up, controls | 3336 | |||||
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The basic task of Libera Brilliance is electron beam position measurement. A secondary, but no less important, task is machine protection. Libera Brilliance activates Interlock output when the beam position is outside predefined limits. The Interlock subsystem also activates when the analog-to-digital converters (AD) are saturated and the beam position is only virtually centered. AD converter saturation is detected in the multiplexed fast peak detectors using AD converter rate data. The Interlock is designed for fail-safe operation. Within the FPGA window, a comparator function is performed on the Fast Acquisition position data delivered at a 10 kHz rate. Comparison is done separately for X and Y positions. Limits and operation mode are settable through the CSPI library. To avoid manual resetting of the Interlock, logic output is designed as a monostable cell. The described circuitry has been successfully implemented and tested in both laboratory and accelerator environments.
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