NSLS Activity Report 2006 - Brookhaven National Laboratory

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were explored, including upgrading the existing VUV ring with a superconducting RF system to provide short bunches for a coherent mode of operation. Magnet Measurement Laboratory (MML) The AD staff worked in collaboration with the OED, the User Science Division and an outside vendor to design, construct, and measure the new X25 cryo-ready MGU. The team completed the iterative process of magnetic measurements, shimming, and optimization in time for the December 2005 installation. Magnetic measurements before and after baking at 90°C, as well as before cool down to –120°C and after warm-up to room temperature, confirmed that the high field quality and very low phase error (2.5° RMS) were preserved through the thermal cycling. Also proven were the mechanical design features for accommodating differential expansion and contraction during the extreme temperature excursions, as were the Keyence optical micrometers monitoring the actual magnet gap. Commissioning took place in February 2006. Figure 1A shows the measured brightness spectrum at the minimum gap of 5.6 mm, and the theoretical spectrum computed by the SPECTRA code Brightness [ph/sec/mm 2 /mrad 2 /0.1%BW/235mA] Brightness [ph/sec/mm 2 /mrad 2 /0.1%BW/235mA] (A) (B) X-ray Energy [keV] X-ray Energy [keV] Figure 1. (A) Measured (solid curve) and predicted (dotted curve) brightness spectra of X25 MGU at minimum magnetic gap of 5.6 mm. (B) Measured tuning curves for the 3 rd through 9 th harmonics. 4-8 (from SPRING-8) for an ideal undulator; there is excellent agreement between the two results. Figure 1B shows the measured tuning curves for the 3 rd through 9 th harmonics over the normal range of magnetic gap operation. (Figures courtesy of J. Ablett & L. Berman, NSLS) The X25 MGU is operating presently with watercooling only. Cryogenic operation at 150K could extend the tuning range of each harmonic downward by about 10%. Potential benefits of the extended tuning are being weighed against the cost of the refrigeration system and the lack of magnetic measurements at cryogenic temperatures. The BNL Cryogenic Safety Committee approved the Phase I configuration of the superconducting (SC) undulator Vertical Test Facility (VTF), permitting operation with liquid helium in the pool-boiling mode. For the commissioning test, a SC Helmholtz coil (for in-situ Hall probe calibration) and a refurbished pair of legacy SC mini-undulator sections with 8.8 mm period were used. Field scans were taken over a range of currents from 25 to 150 A. Figure 2 shows the on-axis field map of the Helmholtz coil and the test SCU at a current of 150 A in both devices. The commissioning run successfully demonstrated the operation of the cryogenic Hall probe mapper and the in-situ calibrator. In collaboration with BNL Superconducting Magnet Division and HTS110, Inc., the MML staff embarked on a technical study of using high-temperature superconductor (HTS) coils to replace the existing copper coils used in VUV dipoles. Three identifiable benefits from an HTS retrofit are: a significant reduction in electrical power requirements to run the dipoles, a simpler and cheaper current supply, and an increased aperture for beam extraction. As an LDRD project, the development of cryo-coil packs for an X-ray ring sextupole magnet has been conducted. Fabrication of the cryo-coil packs has been undertaken and a prototype will be tested by the end of FY07. The 2-meter long strong focusing VISA undulator magnet was completed and measured as part of the Office of Naval Research-funded Free Electron Laser program at the SDL. Source Development Laboratory (SDL) The SDL is an ideal platform to conduct R&D on high-brightness electron beams and laser-seeded free electron lasers (FEL). The SDL consists of a Titanium-Sapphire laser, a photoinjector, a 300-MeV linac and a 10-meter undulator. A second year of funding was obtained from the Joint Technology Office (JTO) and the Office of Naval Research (ONR) to pursue high-gain free electron laser amplifier experiments in the infrared wave-
On-Axis Field (gauss) VTF Test Article #1 at 150A Distance (cm) Figure 2. VTF commissioning run with Helmholtz coil and legacy 8.8 mm period SC undulator immersed in LHe. Helmholtz coil provides cold Hall probe calibration up to 1.7 Tesla at 150 A. length regime. The JTO/ONR-sponsored program included experiments on optical guiding, efficiency enhancement and the first observation of superradiance in an FEL. In addition to the work in the infrared regime, new short-wavelength milestones in the ultraviolet region (UV) were also established. UV light at 190 nm was generated by operating the FEL in the Self Amplified Spontaneous Emission mode and the first lasing of the High Gain Harmonic Generation (HGHG) scheme in 4 th harmonic mode at 199 nm was achieved. Preliminary results on operating the SDL FEL in the Enhanced Self Amplified Spontaneous Emission mode (E-SASE) were also obtained. The SDL has the ability to generate very short electron pulses (1 ps FWHM) with high charge (~ 1 nC), which is ideal for the generation of copious quantities of coherent terahertz radiation (THz). The AD worked in collaboration with the NSLS User Science Division and the BNL Instrumentation Division to characterize the high intensity (~ 100 µJ/pulse) single cycle THz radiation. The high-intensity pulses allowed BNL researchers to explore new phenomena such as nonlinear crossphase modulation (XPM) in electro-optic crystals and preliminary ideas on using the THz as a pump in pump-probe experiments on high-temperature superconductors. The development of an ultra-fast electron diffraction source based on the SDL photoinjector technology is also being considered. 4-9 FACILITY REPORT
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NATIONAL SYNCHROTRON LIGHT SOURCE A
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NATIONAL SYNCHROTRON LIGHT SOURCE 2
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NSLS Summer Sunday Draws 650 Visito
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CHAIRMAN'S INTRODUCTION Chi-Chang K
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USERS' EXECUTIVE COMMITTEE REPORT C
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SCIENCE AT THE NSLS Kendra Snyder N
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Spin-Lattice Interaction in the Qua
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SOFT CONDENSED MATTER AND BIOPHYSIC
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grows. The magnesium also is attrac
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Chicago, Liangtao Li and Jerry Kapl
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STRUCTURE OF AN E. COLI MEMBRANE PR
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for 15 minutes at 180 °C, a 1 x 2
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Said collaborator Eliot Rosen, a ra
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AT THE NSLS, SCIENTISTS WORKING TOW
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NANOPARTICLE ASSEMBLY ENTERS THE FA
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Crystal structure of VCBP3 V1V2 sol
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National Laboratory; and Mati Meron
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X-RAY ANALYSIS METHOD CRACKS THE 'L
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the enzyme and the cofactor binds a
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ticles (Figure 1). The nearest-neig
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is about four times larger. The ver
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Figure 1. Ball model of the UO 2 (1
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of barium sulfate species formed up
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observed in the normal-state of the
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and calculate the contribution to t
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energy gap, responsible for suppres
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20%. Correspondingly, the Fe octahe
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We fit the data in Figure 1 by modi
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of the 1812 RF buckets of the ring
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from the laser, we allow enough tim
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scopic and microscopic characteriza
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suboxic boundary and a concomitant
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intensity of the CaP shoulder (Figu
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effectively combined to elucidate A
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ecomes evident through comparison o
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forming an electrostatic interactio
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promises the possibility of being a
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etween TPP and related compounds is
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(Figure 2). The negative charge on
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spots were observed in control brai
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malaria parasite to the red blood c
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of the resulting complex revealed t
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substrate the hydroperoxide form of
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of AlkB-∆N11 matches that in othe
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Figure 3. In catalysis, this array
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that form a central hydrophobic pat
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structural differences suggest that
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occurs between subunits located tow
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We used x-ray absorption near edge
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tonically as ξ increases (Figure 1
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These results demonstrated that a m
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position of the x-ray beam, pulse-h
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geneity ranges are observed with no
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PEGylated fluoroalkyl side chains r
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interface by annealing bilayer film
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Page 121 and 122: in Farmingville, New York. She inve
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Page 125 and 126: Participants in the 2006 “Take ou
Page 127 and 128: While Dehmer was optimistic about t
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Page 131 and 132: Energy Secretary Samuel Bodman (fro
Page 133 and 134: with majors ranging from history to
Page 135 and 136: described the first measurements of
Page 137 and 138: Visitors gather around the liquid n
Page 139 and 140: high-level degree in the physics fi
Page 141 and 142: Spotlight Awards The Spotlight awar
Page 143 and 144: A) B) Figure 1. X-ray fl uorescence
Page 145 and 146: BNL WINS R&D 100 AWARD FOR X-RAY FO
Page 147 and 148: 2005 Hans-Jürgen Engell Prize The
Page 149 and 150: 2006 NSLS TOURS 1/4/2006 Karen Agos
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Page 159 and 160: NSLS ADVISORY COMMITTEES GENERAL US
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Page 165 and 166: The NSLS has an aggressive preventi
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Page 173 and 174: A new Proposal Oversight Panel (POP
Page 175 and 176: SAFETY REPORT Andrew Ackerman ESH&Q
Page 177 and 178: BUILDING ADMINISTRATION REPORT Bob
Page 179 and 180: ing were cleaned, repaired, and pai
Page 181 and 182: FACILITY FACTS & FIGURES The Nation
Page 183 and 184: Beamline Source Technique Energy Ra
Page 189 and 190: NSLS BOOSTER PARAMETERS NSLS LINAC
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E Selvi, Y Ma, R Aksoy, A Ertas, A
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Y Suh, M Carroll, R Levy, G Bisogni
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S Park, E DiMasi, Y Kim, W Han, P W
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G Da, J Lenkart, K Zhao, R Shiekhat
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J Kaste, B Bostick, A Friedland, A
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X Chen, K Tenneti, C Li, Y Bai, R Z
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G Meinke, P Bullock, A Bohm, Crysta
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D Koller, G Ediss, L Mihaly, G Carr
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