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FINAL TECHNICAL REPORT FOR DE-FG02-05ER64097 Systems and Methods for Injecting Helium Beams into a Synchrotron Accelerator

Description: A research grant was approved to fund development of requirements and concepts for extracting a helium-ion beam at the LLUMC proton accelerator facility, thus enabling the facility to better simulate the deep space environment via beams sufficient to study biological effects of accelerated helium ions in living tissues. A biologically meaningful helium-ion beam will be accomplished by implementing enhancements to increase the accelerator’s maximum proton beam energy output from 250MeV to 3… more
Date: September 30, 2008
Creator: Bush, David A
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electron Beam Diagnostics Of The JLAB UV FEL

Description: In this contribution we describe various systems and aspects of the electron beam diagnostics of the JLab UV FEL. The FEL is installed on a new bypass beam line at the existing 10 kW IR Upgrade FEL. Here, we describe a set of the following systems. A combination of OTR and phosphor viewers is used for measurements of the transverse beam profile, transverse emittance, and Twiss parameters. This system is also used for alignment of the optical cavity of the UV oscillator and to ensure the overlap… more
Date: March 1, 2011
Creator: Evtushenko, Pavel; Benson, Stephen; Biallas, George; Coleman, James; Dickover, Cody; Douglas, David et al.
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Partner: UNT Libraries Government Documents Department
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Design Concept of a Gamma-gamma Higgs Factory Driven by Thin Laser Targets and Energy Recovery Linacs

Description: A gamma-gamma collider has long been considered an option for a Higgs Factory. Such photon colliders usually rely on Compton back-scattering for generating high energy gamma photons and further Higgs bosons through gamma-gamma collisions. The presently existing proposals or design concepts all have chosen a very thick laser target (i.e., high laser photon intensity) for Compton scatterings. In this paper, we present a new design concept of a gamma-gamma collider utilizing a thin laser target (i… more
Date: June 1, 2013
Creator: Zhang, Yuhong
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Partner: UNT Libraries Government Documents Department
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Simultaneous Four-Hall Operation for 12 GeV CEBAF

Description: The CEBAF accelerator at Jefferson lab will have a new experimental hall, Hall D, added to its existing three halls as a part of the ongoing 12 GeV upgrade. Under the present CEBAF design, there is no option for sending beam to all four halls simultaneously. At least one hall has to stay down during the machine operation. A new pattern for interleaving the beam bunches is introduced that allows simultaneous operation of all four halls and provide opportunity for additional future experimental b… more
Date: June 1, 2013
Creator: Kazimi, Reza
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The New 2nd-Generation SRF R&D Facility at Jefferson Lab: TEDF

Description: The US Department of Energy has funded a near-complete renovation of the SRF-based accelerator research and development facilities at Jefferson Lab. The project to accomplish this, the Technical and Engineering Development Facility (TEDF) Project has completed the first of two phases. An entirely new 3,100 m{sup 2} purpose-built SRF technical work facility has been constructed and was occupied in summer of 2012. All SRF work processes with the exception of cryogenic testing have been relocated … more
Date: September 1, 2012
Creator: Reece, Charles E. & Reilly, Anthony V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Q0 Improvement of Large-Grain Multi-Cell Cavities by Using JLab's Standard ILC EP Processing

Description: As reported previously at the Berlin workshop, applying the JLab standard ILC electropolishing (EP) recipe on previously buffered chemical polishing (BCP) etched fine-grain multi-cell cavities results in improvement both in gradient and Q{sub 0}. We recently had the opportunity to experiment with two 1300 MHz 9-cell large-gain niobium cavities manufactured by JLab and Peking University. Both cavities were initially BCP etched and further processed by using JLab's standard ILC EP recipe. Due to … more
Date: July 1, 2011
Creator: Geng, R. L.; Eremeev, G. V.; Kneisel, P.; Liu, K. X.; Lu, X. Y. & Zhao, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Aperture Test for Internal Target Operation in the JLAB High-current ERL

Description: A high current beam transmission test has been successfully completed at the JLAB FEL Facility, culminating in very low-loss transmission of a high current CW beam through a small aperture. The purpose of this test was to determine if an ERL is capable of meeting the stringent requirements imposed by the use of a 1018/cm3 internal gas target proposed for the DarkLight experiment*. Minimal beamline modifications were made to create a machine configuration that is substantially different from tho… more
Date: June 1, 2013
Creator: Zhang, Shukui
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Partner: UNT Libraries Government Documents Department
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Stability of Phase Oscillations Under Two Applied Frequencies

Description: Stability crileria are developed for the stability of motions of particles in a bucket while subjected to an acceleration voltage at small frequency difference {Delta}{nu}. The motion is stable if {Delta}{nu} {>=} {nu}{sub s} where {nu}{sub s} is the phase oscíllation frequency. This is essentially the same criterion as that the buckets not touch.
Date: June 2, 1971
Creator: Mills, F. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Optical Synchrotron Radiation Beam Imaging with a Digital Mask

Description: We have applied a new imaging/optical masking technique, which employs a digital micro-mirror device (DMD) and optical synchrotron radiation (OSR), to perform high dynamic range (DR) beam imaging at the JLAB Energy Recovery Linac and the SLAC/SPEAR3 Synchrotron Light Source. The OSR from the beam is first focused onto the DMD to produce a primary image; selected areas of this image are spatially filtered by controlling the state of individual micro-mirrors; and finally, the filtered image is re… more
Date: November 1, 2012
Creator: Fiorito, R. B.; Zhang, H. D.; Corbett, W. J.; Fisher, A. S.; Mok, W. Y.; Tian, K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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