2011 Particle Accelerator Conference - List of Keywords (synchrotron-radiation)

Paper	Title	Other Keywords	Page
MOP121	Experimental Studies on Coherent Synchrotron Radiation in the Emittance Exchange Line at the Fermilab A0 Photoinjector	emittance, radiation, synchrotron, dipole	322
	J.C.T. Thangaraj, M.D. Church, H.T. Edwards, A.S. Johnson, A.H. Lumpkin, P. Piot, J. Ruan, J.K. Santucci, Y.-E. Sun, R.M. Thurman-Keup Fermilab, Batavia, USA
	Future accelerators will employ advanced beam conditioning systems such as emittance exchangers to manipulate high brightness beams. Coherent synchrotron radiation (CSR) in the dipoles could limit the performance of the emittance exchanger. In this paper, we report the experimental and simulation studies on measuring coherent synchrotron radiation and its effects on the beam at the A0 photoinjector in the emittance exchange line. We show how CSR can be used to measure bunch length of the beam. We also report on the diagnostic scheme based on a weak skew quad in the emittance exchange line to study the CSR effects on the beam and other beam dynamics.

MOP252	Server Development for NSLS-II Physics Applications and Performance Analysis	EPICS, controls, emittance, synchrotron	585
	G. Shen, M.R. Kraimer BNL, Upton, Long Island, New York, USA
	Funding: Work performed under auspices of the U.S. Department of Energy under Contract No. DE-AC02-98CH10886 with Brookhaven Science Associates, LLC. The beam commissioning software framework of NSLS-II project adopts a client/server based architecture to replace the more traditional monolithic high level application approach. The server development is ongoing, and adopts a sourceforge open project so-called epics-pvdata, which consists of pvData, pvAccess, pvEngine, and pvService. Some services have being demonstrated as one service under pvService module such as itemFinder service, gather service, and lattice manager, and each service runs as one standalone server using pvData to store in-memory transient data, pvService to transfer data over network, and pvEngine as service engine. This paper describes a detailed development, latest progress, and performance analysis.

TUODN1	CSR Fields From Using a Direct Numerical Solution of Maxwell's Equations	radiation, vacuum, synchrotron, dipole	784
	A. Novokhatski SLAC, Menlo Park, California, USA
	Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515. We discuss the properties of the coherent electromagnetic fields of a very short, ultra-relativistic bunch in a rectangular vacuum chamber inside a bending magnet. The analysis is based on the results of a direct numerical solution of Maxwell’s equations together with Newton’s equations. We use a new dispersion-free time-domain algorithm which employs a more efficient use of finite element mesh techniques and hence produces self-consistent and stable solutions for very short bunches. We investigate the fine structure of the CSR fields including coherent edge radiation. This approach should be useful in the study of existing and future concepts of particle accelerators and ultrafast coherent light sources.
	Slides TUODN1 [8.690 MB]

TUP216	Design of a Helium Phase Separator with Condenser	cryogenics, radiation, vacuum, synchrotron	1214
	F. Z. Hsiao, T.Y. Huang, C.P. Liu, H.H. Tsai NSRRC, Hsinchu, Taiwan
	This paper presents the design of a helium phase separator with volume of 100 litres. A condenser using a cryocooler for cooling is built into the phase separator to save liquid helium consumption during the test period. The heat loss to the 4.2 K inner vessel is confined within 1W due to the limited 1.5W cooling capacity from the cryocooler. Analysis of mechanical strength and heat load is illustrated.

WEP139	Comparison of 1D and 2D CSR Models with Application to the Fermi@Elettra Bunch Compressors	emittance, dipole, electron, synchrotron	1743
	G. Bassi BNL, Upton, New York, USA J.A. Ellison, K.A. Heinemann UNM, Albuquerque, New Mexico, USA
	Funding: Work partially supported by DOE grant DE-FG02-99ER41104 We compare our 2D mean field (Vlasov-Maxwell) treatment of coherent synchrotron radiation (CSR) effects with 1D approximations of the CSR force which are commonly implemented in CSR codes. In our model we track particles in 4D phase space and calculate 2D forces. The major cost in our calculation is the computation of the 2D force. To speed up the computation and improve 1D models we also investigate approximations to our exact 2D force. Preliminary results are encouraging. As an application, we present numerical results for the LCLS bunch compressors, where recently detailed measurements of the CSR-induced energy loss and transverse emittance growth have been performed and compared with numerical calculations*. Phys. Rev. ST Accel. Beams 12, 080704 (2009) http://www.lnf.infn.it/conference/uBI10/ * Phys. Rev. ST Accel. Beams 12, 030704 (2009)

WEP151	HPC Cloud Applied to Lattice Optimization	lattice, storage-ring, synchrotron, quadrupole	1767
	C. Sun, S. James, K. Muriki, H. Nishimura, Y. Qin, K. Song LBNL, Berkeley, California, USA
	Funding: Work supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 As Cloud services gain in popularity for enterprise use, vendors are now turning their focus towards providing cloud services suitable for scientific computing. Recently, Amazon Elastic Compute Cloud (EC2) introduced the new Cluster Compute Instances (CCI), a new instance type specifically designed for High Performance Computing (HPC) applications. At Berkeley Lab, the physicists at the Advanced Light Source (ALS) have been running Lattice Optimization on a local cluster, but the queue wait time and the flexibility to request compute resources when needed are not ideal for rapid development work. To explore alternatives, for the first time we investigate running the Lattice Optimization application on Amazon’s new CCI to demonstrate the feasibility and trade-offs of using public cloud services for science.

WEP173	Numerical Calculations for the SR Characteristics Described in Terms of Quantum Theory: The Case of Weakly Excited Particles.	radiation, polarization, synchrotron, electron	1810
	A.N. Bourimova Tomsk State University, Tomsk, Russia V.G. Bagrov Institute of High Current Electronics, Tomsk, Russia
	We present the numerical calculations based on the theoretical research of SR characteristics for the weakly excited particles. For a spinless and spinor particle the exploration of effective angles and deviation angles is to be conducted. Comparing the data obtained with its classical analogue , one shows that the quantum theory gives a number of unpredictable results.

WEP185	Properties of Longitudinally Uniform Beam Waveguides	factory, undulator, resonance, synchrotron	1834
	Y.W. Kang ORNL, Oak Ridge, Tennessee, USA R. Kustom, R. Nassiri ANL, Argonne, USA
	Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE. Beam waveguide (BWG) geometry with two longitudinally uniform concave reflectors can support quasi-optical transverse resonances of electromagnetic waves and longitudinal power transmission. The quasi-optical resonance in BWG can be treated as a Gaussian beam. The BWG are often known to have high Q-factors while operating in higher order modes. The latest interests on these beam waveguides are the application for microwave or millimeter wave undulators for synchrotron radiation. The general properties of the BWG are discussed with the field solutions and dispersion properties derived with elliptical beam waveguides approximation. Potential applications of BWG for supporting circularly polarized wave are discussed.

THP039	Development of a High-power THz-TDS System on the Basis of a Compact Electron Linac	electron, laser, linac, synchrotron	2190
	M. Kumaki, K. Sakaue, M. Washio RISE, Tokyo, Japan R. Kuroda, H. Toyokawa, K. Yamada AIST, Tsukuba, Ibaraki, Japan
	The high-power terahertz time-domain spectroscopy (THz-TDS) system has been developed on the basis of a compact S-band electron linac at AIST, Japan. The linac whose injector is a photocathode rf gun generates about a 40 MeV, 1 nC electron bunch. The bunch is compressed into less than 1ps with a magnetic compressor. It is bended by a 90-degree bending magnet, which causes generation of the THz coherent synchrotron radiation (CSR). It has useful characteristics such as high power, a short pulse and continuous spectrum. In particular, peak power of THz-CSR is estimated to be about 10⁶ times larger than that of the conventional THz source on the basis of the mode-locked fs laser. The THz-TDS is based on the EO sampling methods with the pump-probe technique. The frequency spectrum is obtained by Fourier transform of the measured temporal THz waveform. In addition, it is applied to the ultra-short bunch length monitor by analysing the THz spectrum. In this paper, we will describe details of our system and preliminary experimental results.

Paper

Title

Other Keywords

Page

MOP121

Experimental Studies on Coherent Synchrotron Radiation in the Emittance Exchange Line at the Fermilab A0 Photoinjector

emittance, radiation, synchrotron, dipole

322

J.C.T. Thangaraj, M.D. Church, H.T. Edwards, A.S. Johnson, A.H. Lumpkin, P. Piot, J. Ruan, J.K. Santucci, Y.-E. Sun, R.M. Thurman-Keup
Fermilab, Batavia, USA

Future accelerators will employ advanced beam conditioning systems such as emittance exchangers to manipulate high brightness beams. Coherent synchrotron radiation (CSR) in the dipoles could limit the performance of the emittance exchanger. In this paper, we report the experimental and simulation studies on measuring coherent synchrotron radiation and its effects on the beam at the A0 photoinjector in the emittance exchange line. We show how CSR can be used to measure bunch length of the beam. We also report on the diagnostic scheme based on a weak skew quad in the emittance exchange line to study the CSR effects on the beam and other beam dynamics.

MOP252

Server Development for NSLS-II Physics Applications and Performance Analysis

EPICS, controls, emittance, synchrotron

585

G. Shen, M.R. Kraimer
BNL, Upton, Long Island, New York, USA

Funding: Work performed under auspices of the U.S. Department of Energy under Contract No. DE-AC02-98CH10886 with Brookhaven Science Associates, LLC.
The beam commissioning software framework of NSLS-II project adopts a client/server based architecture to replace the more traditional monolithic high level application approach. The server development is ongoing, and adopts a sourceforge open project so-called epics-pvdata, which consists of pvData, pvAccess, pvEngine, and pvService. Some services have being demonstrated as one service under pvService module such as itemFinder service, gather service, and lattice manager, and each service runs as one standalone server using pvData to store in-memory transient data, pvService to transfer data over network, and pvEngine as service engine. This paper describes a detailed development, latest progress, and performance analysis.

TUODN1

CSR Fields From Using a Direct Numerical Solution of Maxwell's Equations

radiation, vacuum, synchrotron, dipole

784

A. Novokhatski
SLAC, Menlo Park, California, USA

Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515.
We discuss the properties of the coherent electromagnetic fields of a very short, ultra-relativistic bunch in a rectangular vacuum chamber inside a bending magnet. The analysis is based on the results of a direct numerical solution of Maxwell’s equations together with Newton’s equations. We use a new dispersion-free time-domain algorithm which employs a more efficient use of finite element mesh techniques and hence produces self-consistent and stable solutions for very short bunches. We investigate the fine structure of the CSR fields including coherent edge radiation. This approach should be useful in the study of existing and future concepts of particle accelerators and ultrafast coherent light sources.

Slides TUODN1 [8.690 MB]

TUP216

Design of a Helium Phase Separator with Condenser

cryogenics, radiation, vacuum, synchrotron

1214

F. Z. Hsiao, T.Y. Huang, C.P. Liu, H.H. Tsai
NSRRC, Hsinchu, Taiwan

This paper presents the design of a helium phase separator with volume of 100 litres. A condenser using a cryocooler for cooling is built into the phase separator to save liquid helium consumption during the test period. The heat loss to the 4.2 K inner vessel is confined within 1W due to the limited 1.5W cooling capacity from the cryocooler. Analysis of mechanical strength and heat load is illustrated.

WEP139

Comparison of 1D and 2D CSR Models with Application to the Fermi@Elettra Bunch Compressors

emittance, dipole, electron, synchrotron

1743

G. Bassi
BNL, Upton, New York, USA
J.A. Ellison, K.A. Heinemann
UNM, Albuquerque, New Mexico, USA

Funding: Work partially supported by DOE grant DE-FG02-99ER41104
We compare our 2D mean field (Vlasov-Maxwell) treatment of coherent synchrotron radiation (CSR) effects with 1D approximations of the CSR force which are commonly implemented in CSR codes. In our model we track particles in 4D phase space and calculate 2D forces*. The major cost in our calculation is the computation of the 2D force. To speed up the computation and improve 1D models we also investigate approximations to our exact 2D force. Preliminary results are encouraging**. As an application, we present numerical results for the LCLS bunch compressors, where recently detailed measurements of the CSR-induced energy loss and transverse emittance growth have been performed and compared with numerical calculations***.
* Phys. Rev. ST Accel. Beams 12, 080704 (2009)
** http://www.lnf.infn.it/conference/uBI10/
*** Phys. Rev. ST Accel. Beams 12, 030704 (2009)

WEP151

HPC Cloud Applied to Lattice Optimization

lattice, storage-ring, synchrotron, quadrupole

1767

C. Sun, S. James, K. Muriki, H. Nishimura, Y. Qin, K. Song
LBNL, Berkeley, California, USA

Funding: Work supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
As Cloud services gain in popularity for enterprise use, vendors are now turning their focus towards providing cloud services suitable for scientific computing. Recently, Amazon Elastic Compute Cloud (EC2) introduced the new Cluster Compute Instances (CCI), a new instance type specifically designed for High Performance Computing (HPC) applications. At Berkeley Lab, the physicists at the Advanced Light Source (ALS) have been running Lattice Optimization on a local cluster, but the queue wait time and the flexibility to request compute resources when needed are not ideal for rapid development work. To explore alternatives, for the first time we investigate running the Lattice Optimization application on Amazon’s new CCI to demonstrate the feasibility and trade-offs of using public cloud services for science.

WEP173

Numerical Calculations for the SR Characteristics Described in Terms of Quantum Theory: The Case of Weakly Excited Particles.

radiation, polarization, synchrotron, electron

1810

A.N. Bourimova
Tomsk State University, Tomsk, Russia
V.G. Bagrov
Institute of High Current Electronics, Tomsk, Russia

We present the numerical calculations based on the theoretical research of SR characteristics for the weakly excited particles. For a spinless and spinor particle the exploration of effective angles and deviation angles is to be conducted. Comparing the data obtained with its classical analogue , one shows that the quantum theory gives a number of unpredictable results.

WEP185

Properties of Longitudinally Uniform Beam Waveguides

factory, undulator, resonance, synchrotron

1834

Y.W. Kang
ORNL, Oak Ridge, Tennessee, USA
R. Kustom, R. Nassiri
ANL, Argonne, USA

Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE.
Beam waveguide (BWG) geometry with two longitudinally uniform concave reflectors can support quasi-optical transverse resonances of electromagnetic waves and longitudinal power transmission. The quasi-optical resonance in BWG can be treated as a Gaussian beam. The BWG are often known to have high Q-factors while operating in higher order modes. The latest interests on these beam waveguides are the application for microwave or millimeter wave undulators for synchrotron radiation. The general properties of the BWG are discussed with the field solutions and dispersion properties derived with elliptical beam waveguides approximation. Potential applications of BWG for supporting circularly polarized wave are discussed.

THP039

Development of a High-power THz-TDS System on the Basis of a Compact Electron Linac

electron, laser, linac, synchrotron

2190

M. Kumaki, K. Sakaue, M. Washio
RISE, Tokyo, Japan
R. Kuroda, H. Toyokawa, K. Yamada
AIST, Tsukuba, Ibaraki, Japan

The high-power terahertz time-domain spectroscopy (THz-TDS) system has been developed on the basis of a compact S-band electron linac at AIST, Japan. The linac whose injector is a photocathode rf gun generates about a 40 MeV, 1 nC electron bunch. The bunch is compressed into less than 1ps with a magnetic compressor. It is bended by a 90-degree bending magnet, which causes generation of the THz coherent synchrotron radiation (CSR). It has useful characteristics such as high power, a short pulse and continuous spectrum. In particular, peak power of THz-CSR is estimated to be about 10⁶ times larger than that of the conventional THz source on the basis of the mode-locked fs laser. The THz-TDS is based on the EO sampling methods with the pump-probe technique. The frequency spectrum is obtained by Fourier transform of the measured temporal THz waveform. In addition, it is applied to the ultra-short bunch length monitor by analysing the THz spectrum. In this paper, we will describe details of our system and preliminary experimental results.