378 Matching Results

Search Results

Advanced search parameters have been applied.

in subjects: "43 Particle Accelerators"

open access

Proceedings of the 1977 Isabelle Summer Workshop. [Seventy-four papers]

A report is given of the activities of the 1977 ISABELLE Summer Workshop, held from July 18 to 29, 1977 at the Brookhaven National Laboratory. An abstract was prepared for each of the seventy-four separate presentations for inclusion in DOE Energy Research Abstracts (ERA). (PMA)

Date: July 18, 1977

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Review of experiments

A study was made to examine the effects which raising the ISA from 200 x 200 GeV to 400 x 400 GeV would have on the ''canonical'' experiments. These were ''canonical'' in the sense that they span the full range of foreseeable physics and have served as topics in previous Summer Studies and Workshops which resulted in quite explicit hardware designs and experimental goals. The study results indicate that all of the ''canonical'' experiments survive. Some are actually improved, some are unaffecte… more

Date: August 18, 1977

Creator: Chang, C.; Yodh, G.; Cutts, D.; Lanou, R.; Engels, E.; Kramer, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Report of Working Group on Accelerator Problems

There are many experimental elementary particle objectives which are uniquely achievable with polarized proton beams. These objectives require both higher beam energies and intensities than are presently available. The polarized ion source working group concluded that it looks quite practical to produce polarized H sources with output currents of several mA. The significance of this is best demonstrated by the fact that the ZGS operates at its space charge limit using a 6 mA H/sup -/ impolarize… more

Date: October 18, 1977

Creator: Cho, Y.; Montague, B. W.; Kubischta, W.; Turrin, A.; Courant, E. D. & Ratner, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Beam bunching in a final storage ring

A calculation is presented for the final bunching of a particle beam in a synchrotron or storage ring. The voltage per turn, the harmonic number, and the bunching time are obtained. (PMA)

Date: November 18, 1977

Creator: Lambertson, G.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Improved performance of the ATA injector

During the last year we re-configured the ATA injector to accommodate field emission cathodes. The injector is now run as a diode machine with a 7 cm radius cathode, an A-K gap of 12.9 cm and a field stress of 190 kV/cm. The advantage of using field emission cathodes is we have increased the injector brightness by a factor of ten above the level we were able to reach using the low density plasma cathodes.

Date: June 18, 1985

Creator: Weir, J.T.; Caporaso, G.J. & Prono, D.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The Brookhaven electron analogue, 1953--1957

The following topics are discussed on the Brookhaven electron analogue: L.J. Haworth and E.L. VanHorn letters; Original G.K. Green outline for report; General description; Parameter list; Mechanical Assembly; Alignment; Degaussing; Vacuum System; Injection System; The pulsed inflector; RF System; Ferrite Cavity; Pick-up electrodes and preamplifiers; Radio Frequency power amplifier; Lens supply; Controls and Power; and RF acceleration summary.

Date: December 18, 1991

Creator: Plotkin, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Model based controls and the AGS booster controls system architecture

The Heavy Ion Transfer Line used to inject heavy ions created at the Tandem Van de Graaff into the Alternating Gradient Synchrotron (AGS) is briefly discussed, particularly as regards its control system. (LEW)

Date: August 18, 1987

Creator: Casella, R.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A microwave power driver for linac colliders: Gigatron

The gigatron is a new rf amplifier tube designed for linac collider applications. Three design features permit extension of the lasertron concept to very high frequencies. First, a gated field-emitter array is employed for the modulated cathode. Second, a ribbon beam geometry mitigates space charge depression and facilitates efficient output coupling. Third, a traveling wave output coupler is used to obtain optimum coupling to the ribbon beam. This paper describes recent developments in the gig… more

Date: November 18, 1988

Creator: Bizek, H.M.; Elliott, S.M.; McIntyre, P.M.; Nassiri, A.; Popovic, M.B.; Raparia, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurements and Modeling of Coherent Synchrotron Radiation and its Impact on the LCLS Electron Beam

In order to reach the high peak current required for an x-ray free electron laser, two separate magnetic dipole chicanes are used in the Linac Coherent Light Source (LCLS) accelerator to compress the electron bunch length in stages. In these bunch compressors, coherent synchrotron radiation (CSR) can be emitted either by a short electron bunch or by any longitudinal density modulation that may be on the bunch. In this paper, we report detailed measurements of the CSR-induced energy loss and tra… more

Date: December 18, 2008

Creator: Bane, K. L. F.; Decker, F. J.; Ding, Y.; Dowell, D.; Emma, P.; Frisch, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Justification for the Development of a Bending Magnet Beamline at Sector 10 at the APS.

The long-planned and much-needed merger of EnviroCAT into the Materials Research Collaborative Access Team (MR-CAT) will provide dedicated state-of-the-art facilities that are critical to research on a broad range of issues in environmental sciences. These CATs will focus on developing a bending magnet (BM) beamline for x-ray absorption fine structure (XAFS) and micro x-ray analysis of environmental samples through integration with existing insertion device (ID) capabilities in XAFS, micro x-ra… more

Date: September 18, 2006

Creator: Kemner, K. M. & Division, Biosciences

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Dielectric Wall Accelerator Technology

The dielectric wall accelerator (DWA) is a compact pulsed power device where the pulse forming lines, switching, and vacuum wall are integrated into a single compact geometry. For this effort, we initiated a extensive compact pulsed power development program and have pursued the study of switching (gas, oil, laser induced surface flashover and photoconductive), dielectrics (ceramics and nanoparticle composites), pulse forming line topologies (asymmetric and symmetric Blumleins and zero integral… more

Date: October 18, 2007

Creator: Sampayan, S.; Caporaso, G.; Chen, Y.; Harris, J.; Hawkins, S.; Holmes, C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

PHASE SHIFTS IN pi+ -p SCATTERING AT 310 Mev

In an experimental program recently completed at the 184-inch synchrocyclotron in Berkeley, data were obtained on elastic {pi}{sup +}-p scattering at a laboratory energy of 310 Mev. Quantities measured were the differential cross section, the total cross section, and the polarization of the recoil protons as a function of center-of-mass angle. We have analyzed the data in terms of S, P, and D waves and have obtained only one acceptable solution. The resultant set of phase shifts is of the Fermi… more

Date: November 18, 1959

Creator: Foote, James H.; Chamberlain, Owen; Rogers, Ernest H.; Steiner,Herbert M.; Wiegand, Clyde & Ypsilantis, Tom

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Significant Lifetime and Background Improvements in PEP-II by Reducing the 3rd Order Chromaticity in LER with Orbit Bumps

Orbit bumps in sextupoles are routinely used for tuning the luminosity in the PEP-II B-Factory. Anti-symmetric bumps at a pair of identical sextupoles separated by -I section generate the net dispersion, while symmetric horizontal bumps induce a tune shift and beta beat. By combining two of these symmetric bumps with opposite signs, where the second pair is 90{sup o} away, the tune shift cancels and the beta beat doubles. In the low energy ring (LER), there are four -I sextupole pairs per arc, … more

Date: December 18, 2007

Creator: Decker, F. J.; Nosochkov, Y.; Sullivan, M. & Yocky, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Simulation Studies on the Vertical Emittance Growth in the ATF Extraction Beam line

Significant dependence of the vertical emittance growth on the beam intensity was experimentally observed at the ATF/KEK extraction beamline. This technical note describes the simulations of possible vertical emittance growth sources, particularly in the extraction channel, where the magnets are shared by both the ATF extraction beamline and its damping ring. The vertical emittance growth is observed in the simulations by changing the beam orbit in the extraction channel even with all optics co… more

Date: December 18, 2007

Creator: Zhou, F.; Amann, J.; Selestiky, S.; Seryi, A.; Spencer, C. & Woodley, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

XAMPS Detectors Readout ASIC for LCLS

An ASIC for the readout of signals from X-ray Active Matrix Pixel Sensor (XAMPS) detectors to be used at the Linac Coherent Light Source (LCLS) is presented. The X-ray Pump Probe (XPP) instrument, for which the ASIC has been designed, requires a large input dynamic range on the order of 104 photons at 8 keV with a resolution of half a photon FWHM. Due to the size of the pixel and the length of the readout line, large input capacitance is expected, leading to stringent requirement on the noise o… more

Date: December 18, 2008

Creator: Dragone, A.; Pratte, J. F.; Rehak, P.; Carini, G. A.; Herbst, R.; O'Connor, P. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Running Shanghai Soft x-ray FEL with the EEHG scheme

With the nominal beam parameters (beam energy: 0.84 GeV, slice energy spread: 168 keV, peak current: 600 A, normalized emittance: 2 mm mrad) of the Shanghai soft X-ray Free Electron Laser (SXFEL) project, we show that using the echo-enabled harmonic generation (EEHG) scheme, 9 nm coherent soft x-ray with peak power exceeding 400 MW can be generated directly from the 270 nm seeding laser.

Date: December 18, 2008

Creator: Xiang, D. & Stupakov, G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Resolution Improvement and Pattern Generator Development for theMaskless Micro-Ion-Beam Reduction Lithography System

The shrinking of IC devices has followed the Moore's Law for over three decades, which states that the density of transistors on integrated circuits will double about every two years. This great achievement is obtained via continuous advance in lithography technology. With the adoption of complicated resolution enhancement technologies, such as the phase shifting mask (PSM), the optical proximity correction (OPC), optical lithography with wavelength of 193 nm has enabled 45 nm printing by immer… more

Date: May 18, 2006

Creator: Jiang, Ximan

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

open access

Modification and Measurement of the Adjustable Permanent Magnet Quadrupole for the Final Focus in a Linear Collider

An adjustable permanent magnet quadrupole has been developed for the final focus (FF) in a linear collider. Recent activities include a newly fabricated inner ring to demonstrate the strongest field gradient at a smaller bore diameter of 15mm and a magnetic field measurement system with a new rotating coil. The prospects of the R&D will be discussed.

Date: January 18, 2008

Creator: Kuroda, S.; Okugi, T.; Tauchi, T.; /KEK, Tsukuba; Fujisawa, H.; Ichikawa, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Next Generation IGBT Switch Plate Development for the SNS High Voltage Converter Modulator

The RF source High Voltage Converter Modulator (HVCM) systems installed on the Spallation Neutron Source (SNS) have operated well in excess of 200,000 hours, during which time numerous failures have occurred. An improved Insulated Gate Bipolar Transistor (IGBT) switch plate is under development to help mitigate these failures. The new design incorporates two significant improvements. The IGBTs are upgraded to 4500 V, 1200 A, press-pack devices, which increase the voltage margin, facilitate bett… more

Date: September 18, 2008

Creator: Kemp, Mark A.; Burkhart, Craig; Nguyen, Minh N. & Anderson, David E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

X-Band Traveling Wave Rf Deflector Structures

Design studies on the X-Band transverse RF deflectors operating at HEM{sub ll} mode have been made for two different applications. One is for beam measurement of time-sliced emittance and slice energy spread for the upgraded LCLS project, its optimization in RF efficiency and system design are carefully considered. Another is to design an ultra-fast RF kicker in order to pick up single bunches from the bunch-train of the B-factory storage ring. The challenges are to obtain very short structure … more

Date: December 18, 2008

Creator: Wang, J. W. & Tantawi, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Echo-enabled Harmonic Generation Free Electron Laser

In this paper, we systematically study the echo-enabled harmonic generation (EEHG) free electron laser (FEL). The EEHG FEL uses two modulators in combination with two dispersion sections that allow to generate in the beam a high harmonic density modulation starting with a relatively small initial energy modulation of the beam. After presenting analytical theory of the phenomenon, we address several practically important issues, such as the effect of incoherent synchrotron radiation in the dispe… more

Date: December 18, 2008

Creator: Xiang, D. & Stupakov, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Resolution of a High Performance Cavity Beam Position Monitor System

No Description Available.

Date: June 18, 2007

Creator: Walston, S.; Chung, C.; Fitsos, P.; Gronberg, J.; Ross, M.; Khainovski, O. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Observation of Coherent Optical Transition Radiation in the LCLS Linac

The beam diagnostics in the linac for the Linac Coherent Light Source (LCLS) X-ray FEL project at SLAC includes optical transition radiation (OTR) screens for measurements of transverse and longitudinal beam properties. We report on observations of coherent light emission from the OTR screens (COTR) at visible wavelengths from the uncompressed and compressed electron beam at various stages in the accelerator.

Date: September 18, 2008

Creator: Loosy, H.; Akre, R.; Brachmann, A.; Decker, F. J.; Ding, Y.; Dowell, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Evaluation and Compensation of Detector Solenoid Effects on Disrupted Beam in the ILC 14 mrad Extraction Line

This paper presents calculations of detector solenoid effects on disrupted primary beam in the ILC 14 mrad extraction line. Particle tracking simulations are performed for evaluation of primary beam loss along the line as well as of beam distribution and polarization at Compton Interaction Point. The calculations are done both without and with solenoid compensation. The results are obtained for the baseline ILC energy of 500 GeV center-of-mass and three options of beam parameters.

Date: December 18, 2008

Creator: Toprek, Dragan; /VINCA Inst. Nucl. Sci., Belgrade & Nosochkov, Yuri

Item Type: Report

Partner: UNT Libraries Government Documents Department

378 Matching Results

Search Results

Add Filters

Applied Filters

Proceedings of the 1977 Isabelle Summer Workshop. [Seventy-four papers]

Review of experiments

Report of Working Group on Accelerator Problems

Beam bunching in a final storage ring

Improved performance of the ATA injector

The Brookhaven electron analogue, 1953--1957

Model based controls and the AGS booster controls system architecture

A microwave power driver for linac colliders: Gigatron

Measurements and Modeling of Coherent Synchrotron Radiation and its Impact on the LCLS Electron Beam

Justification for the Development of a Bending Magnet Beamline at Sector 10 at the APS.

Dielectric Wall Accelerator Technology

PHASE SHIFTS IN pi+ -p SCATTERING AT 310 Mev

Significant Lifetime and Background Improvements in PEP-II by Reducing the 3rd Order Chromaticity in LER with Orbit Bumps

Simulation Studies on the Vertical Emittance Growth in the ATF Extraction Beam line

XAMPS Detectors Readout ASIC for LCLS

Running Shanghai Soft x-ray FEL with the EEHG scheme

Resolution Improvement and Pattern Generator Development for theMaskless Micro-Ion-Beam Reduction Lithography System

Modification and Measurement of the Adjustable Permanent Magnet Quadrupole for the Final Focus in a Linear Collider

Next Generation IGBT Switch Plate Development for the SNS High Voltage Converter Modulator

X-Band Traveling Wave Rf Deflector Structures

Echo-enabled Harmonic Generation Free Electron Laser

Resolution of a High Performance Cavity Beam Position Monitor System

Observation of Coherent Optical Transition Radiation in the LCLS Linac

Evaluation and Compensation of Detector Solenoid Effects on Disrupted Beam in the ILC 14 mrad Extraction Line