49 Matching Results

Search Results

Advanced search parameters have been applied.

in creator/contributor: "Decker, G."

open access

Open loop compensation for the eddy current effect in the APS storage ring vacuum chamber

In the third generation synchrotron light sources, closed orbit stabilization against external vibrations is critical to ensure low emittance and high brightness. The Advanced Photon Source (APS) will use a large number (678) of correction magnets to create local bumps and to achieve global orbit stabilization. In this paper, we will present the result of the effort to counter the effect due to the finite inductance of the magnet and the eddy current in the 1/2 in.-thick aluminum storage ring v… more

Date: January 1, 1991

Creator: Chung, Y.; Bridges, J.; Emery, L. & Decker, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Magnetic measurements on the X-17 superconducting wiggler

In this report, magnetic field measurements for the superconducting wiggler magnet to be installed in the straight section of the x-ray ring illuminating beam line X17 are described and experimental results are given. A general multiple expansion for the integrated field is derived using the theory of analytic functions. The theory is applied to the measurement of multipole coefficients. Qualitative features of the wiggler's behaviour, such as quenching characteristics and hysteresis, are also … more

Date: July 1, 1987

Creator: Decker, G. & Galayda, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Offset calibration of the beam position monitor using external means

Determination of the offset of the electrical center of the beam position monitor (BPM) relative to the mechanical center is required for the absolute beam position measurement in the injector synchrotron and the storage ring of the APS. Conventionally, RF signal is sent to an antenna or through a wire carefully aligned in the vacuum chamber and the signal is measured at each electrode. A new method using only external means which does not involve mechanical alignment inside the vacuum chamber … more

Date: January 1, 1991

Creator: Chung, Y. & Decker, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Experience with Phase II insertion devices in the x-ray ring

The installation of Phase II insertion devices in the NSLS x-ray ring was completed in February 1989, when the hybrid wiggler magnet (HBW) for beam line X21 and the superconducting wiggler (SCW) for beam line X17 were installed. Prior to this time, the soft x-ray undulator (SXU) and X1, another hybrid wiggler at X25, and the ten period mini-undulator at X13 had been installed. 8 refs., 4 figs., 2 tabs.

Date: January 1, 1989

Creator: Decker, G.; Galayda, J.; Krinsky, S. & Solomon, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The attainment of large accelerating gradients using near field synchrotron radiation

Lienard-Wiechert potentials are used to find the electromagnetic field everywhere in free space resulting from a point charge moving on a helical trajectory. The total power emitted as synchrotron radiation from a particle on a circular path is calculated. The point charge results are generalized to the case of a line charge, and formulae are presented which can easily be evaluated numerically. A useful gradient of 80 MeV/m per kA of peak driving beam current over a distance of 1 cm is calculat… more

Date: January 1, 1989

Creator: Decker, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Progress on the development of APS beam position monitoring system

This paper describes the development status of the beam position monitoring system for the Advanced Photon Source (APS), a third-generation light source now under construction at Argonne National Laboratory. The accelerator complex will consist of an electron linac, a positron linac, a positron accumulator ring (PAR), an injector synchrotron and a storage ring. For beam position measurement, striplines will be used on the linacs, while button-type pickups will be used on the injector synchrotro… more

Date: January 1, 1991

Creator: Decker, G. & Chung, Youngjoo.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Magnetic measurements of permanent magnet insertion devices at the BNL-NSLS (Brookhaven National Laboratory--National Synchrotron Light Source)

Since June 1988, three permanent magnet insertion devices of the hybrid type have been installed into the x-ray ring at the National Synchrotron Light Source at Brookhaven National Lab. as part of the Phase II facility upgrade. The three magnets consist of a soft x-ray undulator (SXU) and two hybrid wigglers, with peak fields of 0.35 and 1.2 Tesla respectively. The SXU magnet has iron poles, samarium cobalt permanent magnets, 80mm period length, 77 poles, and a gap range of 31--100 mm. For this… more

Date: January 1, 1989

Creator: Solomon, L.; Decker, G.; Galayda, J. & Kitamura, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The superconducting wiggler at the NSLS (National Synchrotron Light Source): Systems description and initial experience

The superconducting wiggler at the National Synchrotron Light Source and its associated systems are described. The operation and performance of the wiggler, in addition to its effects on X-ray ring operation, are discussed. Experimental results are presented. 10 refs., 5 figs., 2 tabs.

Date: January 1, 1989

Creator: Decker, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Overview of charged-particle beam diagnostics for the Advanced Photon Source (APS)

Plans, prototypes, and initial test results for the charged-particle beam (e[sup [minus]],e[sup +]) diagnostic systems on the injector rings, their transport lines, and the storage ring for the Advanced Photon Source (APS) are presented. The APS will be a synchrotron radiation user facility with one of the world's brightest x-ray sources in the 10-keV to 100-keV regime. Its 200-MeV electron linac, 450-MeV positron linac, positron accumulator ring, 7-GeV booster synchrotron, 7-GeV storage ring, … more

Date: January 1, 1992

Creator: Lumpkin, A. H.; Decker, G.; Kahana, E.; Patterson, D.; Sellyey, W.; Votaw, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Charged-Particle Beam Diagnostics for the Advanced Photon Source (APS)

Plans, prototypes, and initial test results for the charged-particle beam (e[sup [minus]], e[sup +]) diagnostic systems on the injector rings, their transport lines, and the storage ring for the Advanced Photon Source (APS) are presented. The APS will be a synchrotron radiation user facility with one of the world's brightest x-ray sources in the 10-keV to 100-keV regime. Its 200-MeV electron linac, 450-MeV positron linac, positron accumulator ring, 7-GeV booster synchrotron, 7-GeV storage ring,… more

Date: 1992~

Creator: Lumpkin, A. H.; Decker, G.; Kahana, E.; Patterson, D.; Sellyey, W.; Wang, X. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Magnetic measurements on insertion devices at NSLS

Magnetic measurements on three insertion devices for use in the NSLS x-ray ring are described. Hall probes were used for field mapping, and rotating long coils were used to determine integrated multipole coefficients. Results are presented for an iron pole-REC hybrid undulator, a vanadium permendur pole-REC wiggler and a 5 Tesla superconducting wiggler. 6 refs., 8 figs., 2 tabs.

Date: January 1, 1988

Creator: Decker, G.; Galayda, J.; Kitamura, M. & Solomon, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Abort interlock diagnostic for protection of APS vacuum chamber

The Advanced Photon Source (APS) vacuum system has been designed to be passively safe from bending magnet radiation heating at positron beam currents up to 30 mA. Above this value, certain components may be damaged from vertical beam missteering, although work is proceeding to raise the safe current threshold. Because of this, a system for preventing the misalignment of high power density beams is required. This report details a system for protection from dipole radiation only. Work on a system… more

Date: January 1, 1993

Creator: Decker, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Offset calibration of the beam position monitor using external means

Date: December 31, 1991

Creator: Chung, Y. & Decker, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Overview of charged-particle beam diagnostics for the Advanced Photon Source (APS)

Plans, prototypes, and initial test results for the charged-particle beam (e{sup {minus}},e{sup +}) diagnostic systems on the injector rings, their transport lines, and the storage ring for the Advanced Photon Source (APS) are presented. The APS will be a synchrotron radiation user facility with one of the world`s brightest x-ray sources in the 10-keV to 100-keV regime. Its 200-MeV electron linac, 450-MeV positron linac, positron accumulator ring, 7-GeV booster synchrotron, 7-GeV storage ring, … more

Date: December 31, 1992

Creator: Lumpkin, A. H.; Decker, G.; Kahana, E.; Patterson, D.; Sellyey, W.; Votaw, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of GUS for control applications at the Advanced Photon Source

A script-based interpretive shell GUS (General Purpose Data Acquisition for Unix Shell) has been developed for application to the Advanced Photon Source (APS) control. The primary design objective of GUS is to provide a mechanism for efficient data flow among modularized objects called Data Access Modules (DAMs). GUS consists of four major components: user interface, kernel, built-in command module, and DAMS. It also incorporates the Unix shell to make use of the existing utility programs for f… more

Date: August 1, 1994

Creator: Chung, Y.; Barr, D.; Borland, M.; Kirchman, J.; Decker, G. & Kim, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Beam position monitor calibration for the Advanced Photon Source

This paper describes the sensitivity and offset calibration for the beam position monitors (BPMs) using button-type pickups in the injector synchrotron, storage ring, and insertion devices of the Advanced Photon Source (APS). In order to reduce the overall offset and to isolate the error ({approx_lt} 100 {mu}m) due to the low fabrication tolerance in the extruded storage ring vacuum chamber, the electrical offset is minimized by carefully sorting and matching the buttons and cables according to… more

Date: July 1, 1993

Creator: Chung, Y.; Decker, G.; Kahana, E.; Lenkszus, F.; Lumpkin, A. & Sellyey, W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurement of beta-function and phase using the response matrix

A new method for extracting the beta-function and phase for the beam position monitors (BPMs) and the corrector magnets from the measured response matrix is presented. The response matrix relates beam motion at the BPM locations to changes in corrector magnet strengths. Using the model beta and phase as the initial values, new values are obtained by iteration. The accuracy of beta and phase thus calculated is limited by the accuracy of response matrix measurement and calibration of BPMs and cor… more

Date: July 1, 1993

Creator: Chung, Y.; Decker, G. & Evans, K., Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Abort interlock diagnostic for protection of APS vacuum chamber

Date: June 1, 1993

Creator: Decker, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Status of the Short-Pulse X-Ray Project at the Advanced Photon Source

No Description Available.

Date: October 3, 2013

Creator: Carwardine, J.; Fuerst, J. D.; Grelick, A. E.; Kaluzny, J.; Liu, J.; Nassiri, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Status of the Short-Pulse X-ray Project at the Advanced Photon Source

The Advanced Photon Source Upgrade (APS-U) Project at Argonne will include generation of short-pulse x-rays based on Zholents deflecting cavity scheme. We have chosen superconducting (SC) cavities in order to have a continuous train of crabbed bunches and flexibility of operating modes. In collaboration with Jefferson Laboratory, we are prototyping and testing a number of single-cell deflecting cavities and associated auxiliary systems with promising initial results. In collaboration with Lawre… more

Date: July 2012

Creator: Nassiri, A.; Berenc, T. G.; Borland, M.; Brajuskovic, B.; Bromberek, D. J.; Carwardine, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

APS Science 2006.

In my five years as the Director of the Advanced Photon Source (APS), I have been fortunate to see major growth in the scientific impact from the APS. This year I am particularly enthusiastic about prospects for our longer-term future. Every scientific instrument must remain at the cutting edge to flourish. Our plans for the next generation of APS--an APS upgrade--got seriously in gear this year with strong encouragement from our users and sponsors. The most promising avenue that has emerged is… more

Date: May 24, 2007

Creator: Gibson, J. M.; Fenner, R. B.; Long, G.; Borland, M. & Decker, G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Eigenmodes in two simplified chamber structures studied for spurious microwaves in the APS storage ring beam chamber.

The vertical readback errors are one order of magnitude greater than the horizontal ones in the APS storage ring beam chamber. To learn and solve this problem, we simulate the eigenmodes in two chamber structures, which are simplified from the APS storage ring beam chamber, and find their dependence on the variation of the chamber structures. These two structures are introduced as the solutions to separate and then restrain the spurious microwave modes by using a metal short block and a plate i… more

Date: July 9, 2003

Creator: Sun, X. & Decker, G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

APS storage ring commissioning and early operational experience

The Advanced Photon Source (APS) at Argonne National Laboratory (ANL) uses a 100-mA, 7-GeV positron storage ring to produce high brilliance bending magnet and insertion device x-rays for up to 70 x-ray beamlines. It is 1104 meters in circumference and has a beam liftime designed to exceed 10 hours with 1 nTorr average ring vacuum at 100 mA. The high brilliance required by the synchrotron light users results from the storage ring`s natural emittance of 8.2 nm-rad, together with the requirement t… more

Date: July 1, 1995

Creator: Decker, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Global DC closed orbit correction experiment on the NSLS x-ray ring

In this note are described the global DC closed orbit correction experiments conducted on the X-ray ring at National Synchrotron Light Source (NSLS). The beam response matrix, defined as beam motion at BPM locations per unit kick by corrector magnets, was measured and then inverted using the technique of singular value decomposition (SVD). The product of the inverted matrix and the difference orbit gives the incremental kick strengths necessary to correct the orbit. As a result, the r.m.s. orbi… more

Date: September 15, 1992

Creator: Chung, Y.; Decker, G. & Evans, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department