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Performance of a 1.3 GHZ Normal-Conducting 5-Cell Standing-Wave Cavity

Description: A 5-cell, normal-conducting, 1.3 GHz, standing-wave (SW) cavity was built as a prototype capture accelerator for the ILC positron source. Although the ILC uses predominantly superconducting cavities, the capture cavity location in both a high radiation environment and a solenoidal magnetic field requires it to be normal conducting. With the relatively high duty ILC beam pulses (1 msec at 5 Hz) and the high gradient required for efficient positron capture (15 MV/m), achieving adequate cavity coo… more
Date: November 12, 2008
Creator: Wang, Faya; Adolphsen, Chris & Wang, Juwen
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Spatial resolution limits for synchrotron-based spectromicroscopy in the mid- and near-infrared

Description: Spatial resolution tests were performed on beamline 1.4.4 at the Advanced Light Source in Berkeley, CA, USA, a third-generation synchrotron light source. This beamline couples the high-brightness synchrotron source to a Thermo-Electron Continumum XL infrared microscope. Two types of resolution tests were performed in both the mid-IR and near-IR. The results are compared with a diffraction-limited spot size theory. At shorter near-IR wavelengths the experimental results begin to deviate from dif… more
Date: January 12, 2008
Creator: Levenson, Erika; Lerch, Philippe & Martin, Michael C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Microwave measurements of the ETA accelerating cavity

Description: Microwave measurements of the ETA accelerating cavities have shown eleven resonances in the frequency range of 0 to 850 MHz. These modes have been identified according to their similarity with the modes of a cylindrical cavity. Measurements of the Q's of the modes yielded values from 14 to 70 and transverse shunt impedances (R/sub perpendicular/Q) of 9 to 12..cap omega... In particular, beam breakup mode (TM/sub 110/) has a Q of 20 to 40 and a transverse impedance of 9..cap omega... A later rep… more
Date: March 12, 1980
Creator: Birx, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SLC nomenclature for beamline components

Description: The purpose of this report is to document the SLC nomenclature conventions for beamline components. Included are recent enhancements which should lead to a more consistant usage of the ''unit number'' part of beamline device names. The attached pages are divided into three sections. The first section is a brief summary for the general user. The second section is a more amplified description for those who need more detailed interpretations of device names. The third section contains a few notes … more
Date: July 12, 1984
Creator: Paterson, J. & Silva, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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[New technology for linear colliders]

Description: This report discusses the following topics on research of microwave amplifiers for linear colliders: Context in current microwave technology development; gated field emission for microwave cathodes; cathode fabrication and tests; microwave cathode design using field emitters; and microwave localization.
Date: August 12, 1992
Creator: McIntyre, Peter M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Regulation and drive system for high rep-rate magnetic-pulse compressors

Description: The essentially unlimited rep-rate capability of non-linear magnetic systems has imposed strict requirements on the drive system which initiates the pulse compression. An order of magnitude increase in the rep-rates achieved by the Advanced Test Accelerator (ATA) gas blown system is not difficult to achieve in the magnetic compressor. The added requirement of having a high degree of regulation at the higher rep-rates places strict requirements on the triggerable switch for charging and de-Quein… more
Date: May 12, 1982
Creator: Birx, D. L.; Cook, E. G.; Hawkins, S.; Meyers, A.; Reginato, L. L.; Schmidt, J. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiation measurements in the North arc: November 1986 through April 1987

Description: This paper is an effort to share preliminary data on radiation measurements. Measurements were made using passive lithium-flouride thermoluminescent dosimeters (TLD) placed in the North arc during the start-up period of the Stanford Linear Collider (SLC). Li-7 dosimeters were used for ionizing radiation measurements, and Li-6 dosimeters moderated by polyethylene were used for measuring neutrons. In addition, some measurements were made near alcove N-6 using a Cs-137 gamma-ray source in order to… more
Date: May 12, 1987
Creator: Jenkins, T.M.; Benson, E.; Ipe, N. & Gearhart, R.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Energy sweep compensation of induction accelerators

Description: The ETA-II linear induction accelerator (LIA) is designed to drive a microwave free electron laser (FEL). Beam energy sweep must be limited to {plus minus}1% for 50 ns to limit beam corkscrew motion and ensure high power FEL output over the full duration of the beam flattop. To achieve this energy sweep requirement, we have implemented a pulse distribution system and are planning implementation of a tapered pulse forming line (PFL) in the pulse generators driving acceleration gaps. The pulse di… more
Date: September 12, 1990
Creator: Sampayan, S. E.; Caporaso, G. J.; Chen, Y. J.; Decker, T. A. & Turner, W. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Dispersion in the Presence of Strong Transverse Wakefields

Description: To minimize emittance growth in a long linac, it is necessary to control the wakefields by correcting the beam orbit excursions. In addition, the particle energy is made to vary along the length of the bunch to introduce a damping, known as the BNS damping, to the beam break-up effect. In this paper, we use a two-particle model to examine the relative magnitudes of the various orbit and dispersion functions involved. The results are applied to calculate the effect of a closed orbit bump and a m… more
Date: August 12, 2011
Creator: Assmann, Ralph & Chao, Alex
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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500 MW X-BAND RF SYSTEM OF A 0.25 GEV ELECTRON LINAC FOR ADVANCED COMPTON SCATTERING SOURCE APPLICATION

Description: A Mono-Energetic Gamma-Ray (MEGa-Ray) Compton scattering light source is being developed at LLNL in collaboration with SLAC National Accelerator Laboratory. The electron beam for the Compton scattering interaction will be generated by a X-band RF gun and a X-band LINAC at the frequency of 11.424 GHz. High power RF in excess of 500 MW is needed to accelerate the electrons to energy of 250 MeV or greater for the interaction. Two high power klystron amplifiers, each capable of generating 50 MW, 1.… more
Date: May 12, 2010
Creator: Chu, T S; Anderson, S G; Gibson, D J; Hartemann, F V; Marsh, R A; Siders, C et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Compact X-Band Linac for an X-Ray FEL

Description: With the growing demand for FEL light sources, cost issues are being reevaluated. To make the machines more compact, higher frequency room temperature linacs are being considered, specifically ones using C-band (5.7 GHz) rf technology, for which 40 MV/m gradients are achievable. In this paper, we show that an X-band (11.4 GHz) linac using the technology developed for NLC/GLC can provide an even lower cost solution. In particular, stable operation is possible at gradients of 100 MV/m for single … more
Date: September 12, 2011
Creator: Adolphsen, Chris; Huang, Zhirong; Bane, Karl L. F.; Li, Zenghai; Zhou, Feng; Wang, Faya et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Commissioning of the EBIS-based heavy ion preinjector at Brookhaven

Description: The status is presented of the commissioning of a new heavy ion preinjector at Brookhaven National Laboratory. This preinjector uses an Electron Beam Ion Source (EBIS), and an RFQ and IH Linac, both operating at 100.625 MHz, to produce 2 MeV/u ions of any species for use, after further acceleration, at the Relativistic Heavy Ion Collider (RHIC) and the NASA Space Radiation Laboratory (NSRL). Among the increased capabilities provided by this preinjector are the ability to produce ions of any spe… more
Date: September 12, 2010
Creator: Alessi, J.; Beebe, E.; Binello, S.; Hoff, L.; Kondo, K.; Lambiase, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Generation of Coherent X-Ray Radiation through Modulation Compression

Description: In this paper, we propose a scheme to generate tunable coherent X-ray radiation for future light source applications. This scheme uses an energy chirped electron beam, a laser modulator, a laser chirper and two bunch compressors to generate a prebunched kilo-Ampere current electron beam from a few tens Ampere electron beam out of a linac. The initial modulation energy wavelength can be compressed by a factor of 1 + h{sub b}R{sub 56}{sup a} in phase space, where h{sub b} is the energy bunch leng… more
Date: June 12, 2012
Creator: Qiang, Ji; /LBL, Berkeley & Wu, Juhao
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Multipacting Simulation on Half Wave Resonantor for Beta 0.53

Description: In the driver linac of the Facility for Rare Isotope Beams (FRIB), multipacting is an issue of concern for the superconducting resonators, which must accelerate the ion beams from 0.3 MeV per nucleon to 200 MeV per nucleon. While most of the multipacting bands can be conditioned and eliminated with RF, hard multipacting barriers may prevent the resonators from reaching the design voltage. Using the ACE3P code suite, multipacting bands can be computed and analysed with the Track3P module to iden… more
Date: August 12, 2011
Creator: Ge, Lixin; Li, Zenghai; Ko, Kwok; Popielarski, John; Hartung, Walter & Holzbauer, Jeremiah
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experimental Characterization of the Transverse Phase Space of a 60-MeV Electron Beam Through a Compressor Chicane

Description: Space charge and coherent synchrotron radiation may deteriorate electron beam quality when the beam passes through a magnetic bunch compressor. This paper presents the transverse phase-space tomographic measurements for a compressed beam at 60 MeV, around which energy the first stage of magnetic bunch compression takes place in most advanced linacs. Transverse phase-space bifurcation of a compressed beam is observed at that energy, but the degree of the space charge-induced bifurcation is appre… more
Date: February 12, 2007
Creator: Zhou, F.; Kabel, A.; Rosenzweig, J.; Agustsson, R.; Andonian, G.; Cline, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Picosecond-Resolution "Slice" Emittance Measurement of Electron-Bunches.

Description: The Slice Emittance diagnostic is applicable to particle bunches in a linac that are of the order of a few degrees of phase long. In this technique, the transverse phase space of a longitudinal slice about one degree long is measured. The Slice Emittance diagnostic has been demonstrated on an electron bunch produced by a laser-photocathode RF gun. We measured the transverse beam matrix of one picosecond slices out of a 10 picosecond long bunch (about 10 degrees at the RF frequency of 2856 MHz).… more
Date: May 12, 1997
Creator: Ben-Zvi, Ilan; Qiu, Joe X. & Wang, Xijie
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beam commissioning results for the RFQ and MEBT of the EBIS based preinjector for RHIC

Description: The EBIS based preinjector for both the Relativistic Heavy Ion Collider (RHIC) and NASA Space Radiation Laboratory (NSRL) is now being commissioned at Brookhaven National Laboratory (BNL). In 2008, the RFQ for the project was delivered and commissioned using Test EBIS, which was built to demonstrate the high current EBIS's performance. A dedicated beamline after the RFQ was assembled to confirm the RFQ's performance, and the beam energy was measured by a bending dipole magnet. In November 2009,… more
Date: September 12, 2010
Creator: Okamura, M.; Alessi, J.; Beebe, E.; Kondo, K.; Lambiase, R.; Lockey, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of stripper options for FRIB

Description: The US Department of Energy Facility for Rare Isotope Beams (FRIB) at Michigan State University includes a heavy ion superconducting linac capable of accelerating all ions up to uranium with energies higher than 200 MeV/u and beam power up to 400 kW. To achieve these goals with present ion source performance it is necessary to accelerate simultaneously two charge states of uranium from the ion source in the first section of the linac. At an energy of approximately 16.5 MeV/u it is planned to st… more
Date: September 12, 2010
Creator: Marti, F.; Hershcovitch, A.; Momozaki, Y.; Nolen, J.; Reed, C. & Thieberger, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A new medium energy beam transport line for the proton injector of AGS-RHIC

Description: In Brookhaven National Laboratory (BNL), a 750 keV medium energy beam transport line between the 201 MHz 750 keV proton RFQ and the 200 MeV Alvarez DTL is being modified to get a better transmission of the beam. Within a tight space, high field gradient quadrupoles (65 Tm) and newly designed steering magnets (6.5 mm in length) will be installed considering the cross-talk effects. Also a new half wave length 200 MHz buncher is being prepared. The beam commissioning will be done in this year. To … more
Date: September 12, 2010
Creator: Okamura, M.; Briscoe, B.; Fite, J.; LoDestro, V.; Raparia, D.; Ritter, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fermilab drift tube Linac revisited

Description: Using the PARMILA code running under PC-WINDOWS, the present performance of the Fermilab Drift Tube Linac has been analyzed in the light of new demands on the Linac/Booster complex (the Proton Source). The Fermilab Drift Tube Linac (DTL) was designed in the sixties as a proton linac with a final energy of 200 MeV and a peak current of 100mA. In the seventies, in order to enable multi-turn charge exchange injection into the Booster, the ion source was replaced by an H- source with a peak beam cu… more
Date: May 12, 2004
Creator: Popovic, Milorad
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Positioning system for the LCLS undulator.

Description: The Linac Coherent Light Source (LCLS) Project includes the undulator subsystem that has 33 undulator magnetic structures each 3.4 m long. Positioning of the LCLS undulators along the undulator line with an accuracy of 50 {micro}m in the vertical transverse direction is required. A prototype of the LCLS undulator has been built with a positioning system based on three stages with cam shafts. Each cam shaft produces reciprocating motion with a range of {+-}3 mm. A servomotor with integrated brak… more
Date: September 12, 2002
Creator: Trakhenberg, E. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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BEVATRON OPERATION AND DEVELOPMENT. XXXIII. Period Covered February- April 1962

Description: Experimental work consisted of one new run started and completed this quarter, and the completion of one of the three continuing runs. Of the scheduled operating time, the beam was on for 69.4% of the time, 2.3% of the time was used for experimental setup, and equipment outage took 29.3% of the time. There were two scheduled and two impromptu shutdowns. During one of the scheduled shutdowns the external-beam extraction magnets were installed in the east and south tangent tanks. The other schedu… more
Date: February 12, 1963
Creator: Crebbin, K.C.; Wenzel, W.A.; Lothrop, F.H.G. & Johnson, R.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary study of the positions of elements in LTR

Description: A print-out (filename, Lebout Output, dated 07/14/83) was obtained which contains the LTR quad and bend magnet specifications actually used for final alignment. The format includes tooling ball data plus coordinates, 'X' 'Y' 'Z' in the SBO grid, defining the mechanical centers of the magnets.
Date: August 12, 1983
Creator: Hall, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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