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R P Fliller,
D Padrazo,
G M Wang,
B N Kosciuk,
I Pinayev,
J Rose, T Shaftan,
O Singh,
R Heese,
H.-C Hseuh,
M Johanson
04/2011;
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ABSTRACT: In this article the calculation of brightness and flux for two insertion devices of the 2.8 GeV X-ray storage ring at the NSLS is discussed. The radiation properties from the X25 linearly polarized wiggler and the new X25 short-period undulator are compared at a fixed photon energy (11.3 keV) corresponding to emission from the fifth harmonic of the short-period undulator. For this computation, three commonly available synchrotron radiation programs are used. The capabilities of each of these codes are briefly discussed, and their range of applicability are commented on. It is concluded that special care is needed when modeling the radiation of the classes of insertion devices considered here.
Journal of Synchrotron Radiation 08/2008; 15(Pt 4):335-40. · 2.73 Impact Factor
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ABSTRACT: NSLS-II is a medium energy storage ring of 3 GeV electron beam energy with sub-nm.rad horizontal emittance and top-off capability at 500 mA. Damping wigglers will be used not only to reduce the beam emittance but also for broadband sources for users. Cryo-permanent magnet undulators (CPMUs) are considered for hard X-ray planar device, and permanent magnet based elliptically polarized undulators (EPUs) are for soft X-ray polarization control. Rigorous R&D plans have been established to pursue the performance enhancement of the above devices as well as building new types of insertion devices such as high temperature superconducting wiggler/undulators. This paper describes the details of these activities and discuss technical issues.
Particle Accelerator Conference, 2007. PAC. IEEE; 07/2007
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ABSTRACT: The NSLS-II injector system consists of a 3 GeV booster injected by a 200 MeV linac. Specifications of the linac are derived from Booster and Storage ring beam requirements. Linac design considerations are presented to meet these specifications.
Particle Accelerator Conference, 2007. PAC. IEEE; 07/2007
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T. Shaftan,
J. Rose,
I. Pinayev,
R. Heese,
J. Bengtsson,
J. Skaritka,
W. Meng,
S. Ozaki,
R. Meier,
C. Stelmach, [......],
G. Ganetis,
H.C. Hseuh,
E.D. Johnson,
N. Tsoupas,
W. Guo,
J. Beebe-Wang,
A.U. Luccio,
L.H. Yu,
D. Raparia,
D. Wang
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ABSTRACT: We present the conceptual design of the NSLS-II injection system [1, 2]. The injection system consists of a low-energy linac, booster and transport lines. We review two different injection system configurations; a booster located in the storage ring tunnel and a booster housed in a separate building. We briefly discuss main parameters and layout of the injection system components.
Particle Accelerator Conference, 2007. PAC. IEEE; 07/2007
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ABSTRACT: We present preliminary design of full-energy booster for NSLS-II. In the paper we analyse single-and multi-bunch modes of the booster operations. The booster lattice consists of 24 theoretical minimum emittance (TME) cells with two dispersion suppressors. Lattice design, initial design of the magnets and eddy current contribution to the booster chromaticity is briefly discussed.
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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ABSTRACT: The University of Maryland and the Source Development Laboratory at Brookhaven National Laboratory have been collaborating on a project that explores the use of electron beam pre-modulation at the cathode to control the longitudinal structure of the electron beam. This technique could be applied to creating deliberate modulations which can lead to the generation of terahertz radiation, or creating a smooth profile in order to suppress radiation. This paper focuses on simulations that explore some of the pre-modulated cases achieved experimentally.
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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T. Shaftan,
I. Pinayev,
J. Rose,
X.J. Wang,
J.B. Murphy,
E.D. Johnson,
A. Blednykh,
S. Chouhan,
S.L. Kramer,
S. Krinsky,
S. Pjerov,
B. Podobedov,
G. Rakowsky,
T. Tanabe,
J.M. Wang,
L.H. Yu
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ABSTRACT: Currently the facility upgrade project is in progress at the NSLS (at Brookhaven National Laboratory). The goal of the NSLS-II is a 3 GeV ultra-low-emittance storage ring that will increase radiation brightness by three orders of magnitude over that of the present NSLS X-ray ring. The low emittance of the high brightness ring’s lattice results in a short lifetime, so that a top-off injection mode becomes an operational necessity. Therefore, the NSLS-II injection system must provide, and efficiently inject, an electron beam at a high repetition rate. In this paper, we present our concept of the NSLS-II injection system and discuss the conditions for, and constraints on, its design.
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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J.B. Murphy,
J. Bengtsson,
R. Biscardi,
A. Blednykh,
L. Carr,
W. Casey,
S. Chouhan,
S. Dierker,
E. Haas,
R. Heese, [......],
B. Podobedov,
G. Rakowsky,
J. Rose, T. Shaftan,
B. Sheehy,
J. Skaritka,
N. Towne,
J.M. Wang,
X.J. Wang,
L.H. Yu
[show abstract]
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ABSTRACT: The National Synchrotron Light Source at BNL was the first dedicated light source facility and it has now operated for more than 20 years. During this time the user community has grown to more than 2400 users annually. To insure that this vibrant user community has access to the highest quality photon beams, the NSLS is pursuing the design of a new ultra-high brightness (∼10<sup>21</sup>) electron storage ring, tailored to the 0.3-20 KeV photon energy range. We present our preliminary design and review the critical accelerator physics design issues.
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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T Watanabe,
D Liu,
J B Murphy,
J Rose, T Shaftan,
T Tsang,
X J Wang,
L H Yu,
L Giannessi,
S Spampanati,
Italy P Musumeci
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ABSTRACT: Superradiance and nonlinear evolution of a FEL pulse in a single-pass FEL were experimentally demonstrated at the National Synchrotron Light Source (NSLS) Source Development Laboratory (SDL). The experiment was performed using a 1.5 ps high-brightness electron beam and a 100fs Ti:Sapphire seed laser. The seed laser and electron beam interact in the 10 meter long NISUS undulator with a period of 3.89 cm. The FEL spectrum, energy and pulse length along the undulator were measured. FEL saturation was observed, and gain of more the 200 (relative to seed laser) was measured. Both FEL spectrum widening and pulse length shortening were observed; FEL pulses as short as 65 fs FWHM were measured. The superrandiance and nonlinear evolution were also simulated using the numerical code GENESIS1.3 yielding good agreement with the experimental results.
Free Electron Laser, Stanford, California; 01/2005
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L H Yu,
L DiMauro,
A Doyuran,
W S Graves,
E D Johnson,
R Heese,
S Krinsky,
H Loos,
J B Murphy,
G Rakowsky,
J Rose, T Shaftan,
B Sheehy,
J Skaritka,
X J Wang,
Z Wu
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ABSTRACT: We report the first experimental results on a high-gain harmonic-generation (HGHG) free-electron laser (FEL) operating in the ultraviolet. An 800 nm seed from a Ti:sapphire laser has been used to produce saturated amplified radiation at the 266 nm third harmonic. The results confirm the predictions for HGHG FEL operation: stable central wavelength, narrow bandwidth, and small pulse-energy fluctuation.
Physical Review Letters 09/2003; 91(7):074801. · 7.37 Impact Factor
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ABSTRACT: A new RF control system was designed and implemented to support short pulse High Gain Harmonic Generation (HGHG) experiments, which require subpicosecond synchronization between the laser and the accelerating RF fields. This control system consists of a 81 MHz crystal oscillator to drive both the Ti::Sapphire laser and a 2856 MHz synthesizer, direct vector modulators that control the amplitude and phase of the klystron drive and vector de-modulators for amplitude and phase measurement. RF and electron beam based measurement results of the RF to laser jitter are presented as well as experimental results of synthesizing the RF directly from the 81.6 MHz pump laser pulse train.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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ABSTRACT: A 5 GeV superconducting radiofrequency (SCRF) linac for the dual application of FEL driver and top-off injector for a storage ring is described. Starting from the FEL drive beam requirements of subpicosecond bunch lengths and kiloamp peak current the choice of frequency, gradient and operating modes of the linac are presented. Magnetic optics and RF system descriptions follow to provide the specified beam parameters. Accelerator design issues are identified for future studies.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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ABSTRACT: We present the results of the commissioning of the 10 m long NISUS undulator of the Deep Ultra Violet Free Electron Laser (DUV-FEL) project. The magnet and diagnostics geometry is discussed and tolerances on the beam trajectory straightness are shown. The beam-based alignment algorithm and its application to correct the NISUS field errors are described.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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A. Doyuran,
L. DiMauro,
W. Graves,
R. Heese,
E.D. Johnson,
S. Krinsky,
H. Loos,
J.B. Murphy,
G. Rakowsky,
J. Rose, T. Shaftan,
B. Sheehy,
Y. Shen,
J. Skaritka,
X.J. Wang,
Z. Wu,
L.H. Yu
[show abstract]
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ABSTRACT: The Deep Ultra Violet Free Electron Laser (DUV-FEL) experiment has reached a milestone by saturating the Free Electron Laser using High Gain Harmonic Generation (HGHG) method in the Source Development Laboratory (SDL) at NSLS. It utilizes the 10 m long, 3.9 cm period NISUS wiggler. The goal of the project is to produce radiation at a wavelength less than 100 nm, utilizing the HGHG method. HGHG at 266 nm has been accomplished by seeding with the 800 nm Ti:Sapphire laser and observed saturation. The third harmonic at 88 nm accompanying the 266 nm is being used in an ion pair imaging experiment in chemistry. We discuss the measurement of energy, gain, spectrum, and pulse length of the FEL output. We also describe the diagnostics used for operating the FEL.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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ABSTRACT: Controlling the longitudinal distribution in an electron beam traveling through an accelerator can enhance system performance in various ways. Prebunching an electron beam in an accelerator can lead to enhanced radiation production from various emitters. Smoothing the shape of the electron beam pulse may suppress instabilities that result in beam breakup. This work, a collaboration between the University of Maryland and the Source Development Laboratory at Brookhaven National Laboratory, uses a Ti:Sapphire drive laser modulated at terahertz frequencies to extract a prebunched beam directly from the photocathode prior to acceleration in a linear RF accelerator. We have demonstrated that prebunched terahertz structure can be maintained after leaving the photocathode and through acceleration to high energy. Through the use of simulation and experiment, this work further explores the characteristics of an electron beam produced in this manner and examines the possibility of using this technology to develop a compact, powerful, narrowband terahertz emitter.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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H. Loos,
A. Doyuran,
J.B. Murphy,
J. Rose, T. Shaftan,
B. Sheehy,
Y. Shen,
J. Skaritka,
X.J. Wang,
Z. Wu,
L.H. Yu
[show abstract]
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ABSTRACT: The linac at the NSLS Source Development Lab (SDL) provides a high brightness electron beam for the DUV-FEL project with subpicosecond bunch length and several hundred Amperes peak current by means of a photoinjector and a magnetic bunch compressor. Previous diagnostics of the longitudinal bunch dynamics relied on the rf zero-phasing method and measurements of CTR spectra. In order to have a fast and nonintercepting longitudinal diagnostic available, the electro-optic measurement technique has been implemented with its major component, a synchronized 100 fs Ti:sapphire laser coaligned with the electron beam, already in place as a seed for the FEL. The theoretical temporal resolution for a 100 μm thick ZnTe crystal is limited to about 200 fs and the signal contrast to more than 1%. We present preliminary results of multishot scanning measurements and the single-shot diagnostics of the bunch shape as well as its application as a rf-laser jitter monitor.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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B. Podobedov,
J.M. Ablett,
L. Berman,
R. Biscardi,
G.L. Carr,
B. Casey,
S. Dierker,
A. Doyuran,
R. Heese,
S. Hulbert, [......],
R. Pindak,
S. Pjerov,
J. Rose, T. Shaftan,
B. Sheehy,
P. Siddons,
N. Towne,
J.M. Wang,
X.J. Wang,
L.H. Yu
[show abstract]
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ABSTRACT: To address the growing needs of the NSLS user community we are aggressively pursuing R&D towards a facility upgrade. The present goals are a 3 GeV ultra-low emittance storage ring, tailored to the 5-20 keV photon energy range, that will triple the present NSLS ID capacity, and provide three orders of magnitude increase in brightness over the present brightest NSLS beamlines. To achieve these goals we propose a 24 period TBA lattice, with extensive use of super-conducting small gap undulators. This paper reviews our preliminary design and the key accelerator physics issues.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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ABSTRACT: We present the results of electron beam longitudinal modulation studies in the DUV-FEL accelerator. For bunch length determination we used the "zero-phasing" method, based on a measurement of the chirped electron bunch energy spectra. The measurements revealed a spiky structure in the longitudinal phase space. A model based on space charge effect is considered to explain of the obtained phenomena. The analysis of the energy spectra has shown a sensitivity of the structure to the electron beam peak current, energy and longitudinal non-uniformity of the RF gun drive laser. Analytical calculations have demonstrated a qualitative agreement with experimental observations. Several experiments have been made to compare with theory; measured results are reviewed in this paper. The obtained effect is briefly discussed in relation to high brightness accelerators.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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L Dimauro,
A Doyuran,
W Graves,
R Heese,
E D Johnson,
S Krinsky,
H Loos,
J B Murphy,
G Rakowsky,
J Rose, T Shaftan,
B Sheehy,
J Skaritka,
X J Wang,
L H Yu
[show abstract]
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ABSTRACT: The Deep Ultra-Violet Free Electron Laser (DUVFEL) at the National Synchrotron Light Source consists of a 5 MeV photoinjector, a 200 MeV S-band linear accelerator, a four-magnet chicane compressor and a 10 m wiggler with a 3.9 cm period. The commissioning of the SDL accelerator was completed recently and it is routinely producing a high-quality electron beam with a peak current of B400 A and a normalised emittance of 3–4 mm mrad. The first SASE lasing of the DUV FEL has been demonstrated at both 266 and 400 nm. The gain length of the SASE experiments was measured to be 66 cm in both cases and up to 20 nJ per pulse was obtained. A laser seeded FEL at 266 nm is in the very early stages of commissioning and amplification of the laser seed has been observed. The goal of the seeded laser FEL is to saturate the FEL and thereby generate sufficient third harmonic at 89 nm for experimental applications. Here we report the observation and measurements of SASE at 400 and 266 nm and the first results of seeded FEL. r 2003 Elsevier Science B.V. All rights reserved.
Nuclear Instruments and Methods in Physics Research A. 01/2003; 507:15-18.
