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Overview of Beam Instrumentation and Diagnostics for the NSLS-II Project

Description: A new, ultra-bright 3rd generation light source, the NSLS-II Project, is planned to be built at Brookhaven National Laboratory. The light source being developed will have unprecedently small beam horizontal emittance and will provide the radiation sources with a brightness of 3 x 10{sup 21} photons/sec/0.1%BW/mm{sup 2}/mrad{sup 2}. In this paper we present the detailed specifications and a comprehensive description of the planned beam instrumentation system and the first results of the ongoing … more
Date: May 4, 2008
Creator: Singh,O.
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Partner: UNT Libraries Government Documents Department
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Seismic Response Prediction of Nupec's Field Model Tests of Npp Structures With Adjacent Building Effect.

Description: As part of a verification test program for seismic analysis computer codes for Nuclear Power Plant (NPP) structures, the Nuclear Power Engineering Corporation (NUPEC) of Japan has conducted a series of field model tests to address the dynamic cross interaction (DCI) effect on the seismic response of NPP structures built in close proximity to each other. The program provided field data to study the methodologies commonly associated with seismic analyses considering the DCI effect. As part of a c… more
Date: March 4, 2004
Creator: Xu, J.; Hofmayer, C. & Ali, S.
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Design and Measurement of the NSLS II Correctors

Description: The National Synchrotron Light Source II (NSLS-II) under construction at Brookhaven National Laboratory will be a new state-of-the-art 3 Gev electron storage ring designed to deliver world-leading intensity and brightness, and will produce x-rays more than 10,000 times brighter than the current NSLS at Brookhaven. The 792-meter circumference storage ring is comprised of approximately 1000 magnetic elements, 300 of which are discrete corrector magnets. The three variants are: 120 of the 100 mm a… more
Date: May 4, 2009
Creator: Spataro, C.; Danby, G.; Jackson, J.W.; Jain, A.K.; Rehak, M.; Singh, O. et al.
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Ion bombardment in RF photoguns

Description: A linac-ring eRHIC design requires a high-intensity CW source of polarized electrons. An SRF gun is viable option that can deliver the required beam. Numerical simulations presented elsewhere have shown that ion bombardment can occur in an RF gun, possibly limiting lifetime of a NEA GaAs cathode. In this paper, we analytically solve the equations of motion of ions in an RF gun using the ponderomotive potential of the Rf field. We apply the method to the BNL 1/2-cell SRF photogun and demonstrate… more
Date: May 4, 2009
Creator: Pozdeyev, E.; Kayran, D. & Litvinenko, V. N.
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Partner: UNT Libraries Government Documents Department
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Alternative Designs for the NSLS-II Injection Straight Section

Description: Brookhaven National Laboratory (BNL) is developing a state-of-the-art 3 GeV synchrotron light source, the NSLS-II [1]. The 9.3 meter-long injection straight section of its storage ring now fits a conventional injection set-up consisting of four kickers producing a closed bump, together with a DC septum and a pulsed septum. In this paper, we analyze an alternative option based on injection via a pulsed sextupole magnet. We discuss the dynamics of the injected and stored beams and, subsequently, … more
Date: May 4, 2009
Creator: Shaftan,T.; Heese, R.; Weihreter, E.; Willeke, F.; Rehak, M.; Meier, R. et al.
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Partner: UNT Libraries Government Documents Department
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Results of LEBT/MEBT reconfiguration at BNL 200 MeV LINAC

Description: The low energy (35 keV) and medium energy (750 keV) transport lines for both polarized and unpolarized H{sup -} have been reconfigured to reduce the beam emittance and beam losses out of the 200 MeV Linac. The medium energy line in the original layout was 7 m long, and had ten quadrupoles, two beam choppers, and three bunchers. The bunchers were necessary to keep the beam bunched at the entrance of the Linac. About 35% beam loss occurred, and the emittance growth was several fold. In the new la… more
Date: May 4, 2009
Creator: Raparia, D.; Alessi, J.; Briscoe, B.; Fite, J.; Gould, O.; Kponou, A. et al.
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Partner: UNT Libraries Government Documents Department
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Beam commissioning of the RFQ for the RHIC-EBIS project

Description: Beam commissioning of a new 4 rod RFQ has started at Brookhaven National Laboratory (BNL). The RFQ will accelerate intense heavy ion beams provided by an Electron Beam ion Source (EBIS) up to 300 keV/u. The RFQ will accelerate a range of Q/M from 1 to 1/6, and the accelerated beam will be finally delivered to the Relativistic Heavy Ion Collider (RHIC) and NASA Space Radiation Laboratory (NSRL). The first beam was successfully accelerated and the bunch structures of He{sup +} and Cu{sup 10+} bea… more
Date: May 4, 2009
Creator: Okamura,M.; Alessi, J.; Beebe, E.; Lodestro, V.; Pikin, A.; Ritter, J. et al.
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Partner: UNT Libraries Government Documents Department
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NSLS-II Lattice Optimization with Damping Wigglers

Description: NSLS-II, the third-generation light source which will be built at BNL is designed and optimized for 3 GeV energy, ultra-small emittance and high intensity of 500 mA. It will provide very bright synchrotron radiation over a large spectral range from IR to hard X-rays. Damping wigglers (DWs) are deployed to reduce the emittance of 2 nm by factors of 2-4, as well as for intense radiation sources for users. The linear and nonlinear effects induced by the DWs are integrated into the lattice design. … more
Date: May 4, 2009
Creator: Guo,W.; Kramer, S.; Krinsky, S.; Li, Y.; Nash, B. & Tanabe, T.
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Partner: UNT Libraries Government Documents Department
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Comparison of RF BPM Receivers for NSLS-II Project

Description: The NSLS-II Light Source being built at Brookhaven National Laboratory requires submicron stability of the electron orbit in the storage ring in order to utilize fully very small emittances and electron beam sizes. This sets high stability requirements for beam position monitors and a program has been initiated for the purpose of characterizing RF beam position monitor (BPM) receivers in use at other light sources. Present state-of-the-art performance will be contrasted with more recently avail… more
Date: May 4, 2009
Creator: Pinayev,I. & Singh, O.
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Partner: UNT Libraries Government Documents Department
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NSLS-II Beam Diagnostics Overview

Description: A new 3rd generation light source (NSLS-II) is in the early stages of construction at Brookhaven National Laboratory. The NSLS-II facility will provide ultra high brightness and flux with exceptional beam stability. It presents several challenges for diagnostics and instrumentation, related to the extremely small emittance. In this paper, we present an overview of all planned instrumentation systems, results from research and development activities; and then focus on other challenging aspects.
Date: May 4, 2009
Creator: Singh, O.; Alforque, R.; Bacha, B.; Blednykh, A.; Cameron, P.; Cheng, W. et al.
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Partner: UNT Libraries Government Documents Department
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BNL 703 MHz SRF cryomodule demonstration

Description: This paper will present the preliminary results of the testing of the 703 MHz SRF cryomodule designed for use in the ampere class ERL under construction at Brookhaven National Laboratory. The preliminary cavity tests, carried out at Thomas Jefferson Laboratory, demonstrated cavity performance of 20 MV/m with a Qo of 1 x 10{sup 10}, results we expect to reproduce in the horizontal configuration. This test of the entire string assembly will allow us to evaluate all of the additional cryomodule co… more
Date: May 4, 2009
Creator: Burrill, A.; Ben-Zvi, Ilan; Calaga, R.; Dalesio, L.; Dottavio, T.; Gassner, D. et al.
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Partner: UNT Libraries Government Documents Department
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Status of NSLS-II Storage Ring Vacuum Systems

Description: National Synchrotron Light Source II (NSLS-II), being constructed at Brookhaven National Laboratory, is a 3-GeV, high-flux and high- brightness synchrotron radiation facility with a nominal current of 500 mA. The storage ring vacuum system will have extruded aluminium chambers with ante-chamber for photon fans and distributed NEG strip pumping. Discrete photon absorbers will be used to intercept the un-used bending magnet radiation. In-situ bakeout will be implemented to achieve fast conditioni… more
Date: May 4, 2009
Creator: Doom,L.; Hseuh,H.; Ferreira, M.; Longo, C.; Ravindranath, V.; Settepani, P. et al.
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Partner: UNT Libraries Government Documents Department
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A proof-of-principle experiment of the ferroelectric tuner for the 1.3 GHz gun cavity

Description: A novel ferroelectric frequency tuner was developed by the Ornega-P company and was tested at the Brookhaven National Laboratory on a 1.3 GHz RF cavity at room temperature. The tuner is based on the ferroelectric property of having a permittivity variable with an applied electric field. The achievable frequency tuning range can be estimated from the reactive impedance change due to an applied voltage via a S{sub 11} measurement at the tuner port. The frequency shift can be measured directly wit… more
Date: May 4, 2009
Creator: Hahn,H.; Choi, E.; Shchelkunov, S. V.; Hirshfield, J.; Kazakov, S. & Shschelkunov, S.
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Partner: UNT Libraries Government Documents Department
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MeRHIC - staging approach to eRHIC

Description: Design of a medium energy electron-ion collider (MeRHIC) is under development at the Collider-Accelerator Department at BNL. The design envisions construction of a 4 GeV electron accelerator in a local area inside and near the RHIC tunnel. Electrons will be produced by a polarized electron source and accelerated in energy recovery linacs. Collisions of the electron beam with 100 GeV/u heavy ions or with 250 GeV polarized protons will be arranged in the existing IP2 interaction region of RHIC. T… more
Date: May 4, 2009
Creator: Ptitsyn, V.; Beebe-Wang, J.; Ben-Zvi, Ilan; Deshpande, A.; Fedotov, A.; Hao, Y. et al.
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Partner: UNT Libraries Government Documents Department
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Construction of the BNL EBIS preinjector

Description: A new heavy ion preinjector, consisting of an Electron Beam Ion Source (EBIS), an RFQ, and IH linac, is under construction at Brookhaven National Laboratory. This preinjector win provide ions of any species at an energy of 2 MeV/u, resulting in increased capabilities for the Relativistic Heavy Ion Collider, and the NASA Space Radiation Laboratory programs. The RF'Q has been commissioned with beam, and most of the remaining elements are either installed or being assembled.
Date: May 4, 2009
Creator: Alessi, J.; Barton, D.; Beebe, E.; Bellavia, S.; Gould, O.; Kponou, A. et al.
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Partner: UNT Libraries Government Documents Department
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Preliminary Design of Pinhole camera for NSLS-II Project.

Description: The NSLS-II Light Source being built at Brookhaven National Laboratory is expected to provide very small emittances and electron beam sizes. High resolution imaging systems are required in order to provide robust measurements. The pinhole camera will utilize 6-fold magnification with a pinhole placed inside a crotch absorber. The pinhole is protected from high power synchrotron radiation with a filter made of refractory metal. In this paper we provide resolution analyses, heat load calculations… more
Date: May 4, 2009
Creator: Pinayev,I.; Kosciuk, B. & Singh, O.
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Partner: UNT Libraries Government Documents Department
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Small gap magnets and vacuum chambers for eRHIC

Description: eRHIC[1][2][3], a future high luminosity electron-ion collider at Brookhaven National Laboratory (BNL), will add polarized electrons to the list of colliding species in RHIC. A 10-30 GeV electron energy recovery linac (ERL) will require up to six passes around the RHIC 3.8 km circumference. We are developing and testing small (5 mm) gap dipole and quadrupole magnets and vacuum chambers for cost-effective eRHIC passes [4]. We are also studying the sensitivity of eRHIC pass optics to magnet and a… more
Date: May 4, 2009
Creator: Meng,W.; Bengtsson, J.; Hao, Y.; Mahler, G.; Tuozzolo, J. & Litvinenko, V. N.
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Partner: UNT Libraries Government Documents Department
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First polarized proton collision at a beam energy of 250 GeV in RHIC

Description: After providing collisions of polarized protons at a beam energy of 100 GeV since 2001, the Relativistic Heavy Ion Collider (RHIC) at BNL had its first opportunity to collide polarized protons at its maximum beam energy of 250 GeV in the 2009 polarized proton operations. Equipped with two full Siberian snakes [1] in each ring, RHIC preserves polarization during acceleration from injection to 100 GeV with precise control of the betatron tunes and vertical orbit distortions. However, the strong i… more
Date: May 4, 2009
Creator: Bai,M.; Ahrens, L.; Alekseev, I. G.; Alessi, J. & al., et
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Partner: UNT Libraries Government Documents Department
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CDZNTE ROOM-TEMPERATURE SEMICONDUCTOR GAMMA-RAY DETECTOR FOR NATIONAL-SECURITY APPLICATIONS.

Description: One important mission of the Department of Energy's National Nuclear Security Administration is to develop reliable gamma-ray detectors to meet the widespread needs of users for effective techniques to detect and identify special nuclear- and radioactive-materials. Accordingly, the Nonproliferation and National Security Department at Brookhaven National Laboratory was tasked to evaluate existing technology and to develop improved room-temperature detectors based on semiconductors, such as CdZnT… more
Date: May 4, 2007
Creator: Camarda, G. S.; Bolotnikov, A. E.; Cui, Y.; Hossain, A.; Kohman, K. T. & James, R. B.
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Partner: UNT Libraries Government Documents Department
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Ultra-High Gradient Dielectric Wakefield Accelerator Experiments

Description: Ultra-high gradient dielectric wakefield accelerators are a potential option for a linear collider afterburner since they are immune to the ion collapse and electron/positron asymmetry problems implicit in a plasma based afterburner. The first phase of an experiment to study the performance of dielectric Cerenkov wakefield accelerating structures at extremely high gradients in the GV/m range has been completed. The experiment took advantage of the unique SLAC FFTB electron beam and its ultra-sh… more
Date: August 4, 2006
Creator: Thompson, M. C.; Badakov, H.; Rosenzweig, J. B.; Travish, G.; Hogan, M.; Ischebeck, R. et al.
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Partner: UNT Libraries Government Documents Department
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Physics of Polarity at RHIC-Volume 10

Description: The RBRC Workshop on Physics of Polarimetry at RHIC was held from Aug 4 to 7, 1998 at BNL. The primary motive of the workshop is (1) to discuss the RHIC polarimeter using the elastic proton-carbon scattering at Coulomb-nuclear interference region (p-C CNI polarimeter) in detail and write a proposal for the test experiment a t the AGS, (2) to discuss the related physics, (3) and to discuss other options for the RHIC polarimetry. The idea of the p-C CNI polarimeter was proposed last year as a sim… more
Date: August 4, 1998
Creator: Imai, K. & Fields, D.
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Partner: UNT Libraries Government Documents Department
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Development of High Stability Supports for NSLS-II RF BPMS

Description: The NSLS-II Light Source being built at Brookhaven National Laboratory is expected to provide submicron stability of the electron orbit in the storage ring in order to fully utilize the very small emittances of the electron beam. This requires high stability supports for BPM pickup electrodes located near insertion device sources. Here we provide details for the design and development of these supports as well as measurement of thermal and vibrational stability of a prototype support.
Date: May 4, 2009
Creator: Kosciuk,B.; Alforque, R.; Bacha, B.; Cameron, P.; Lincoln, F.; Ravindranath, V. et al.
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Partner: UNT Libraries Government Documents Department
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Coherent electron cooling

Description: Cooling intense high-energy hadron beams remains a major challenge in modern accelerator physics. Synchrotron radiation is still too feeble, while the efficiency of two other cooling methods, stochastic and electron, falls rapidly either at high bunch intensities (i.e. stochastic of protons) or at high energies (e-cooling). In this talk a specific scheme of a unique cooling technique, Coherent Electron Cooling, will be discussed. The idea of coherent electron cooling using electron beam instabi… more
Date: May 4, 2009
Creator: Litvinenko,V.
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Partner: UNT Libraries Government Documents Department
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