CONTRIBUTED PAPERS


Control Systems And Diagnostics

DIAGNOSTICS OF ULTRASHORT ELECTRON BUNCHES DEVELOPED AT JINR

O. Brovko, D. Kharlamov, O. Kozlov, S. Kostromin, R. Makarov, E. Matyushevskiy, N. Morozov, E. Syresinª, B. Zalikhanov, M. Yurkov

Joint Institute for Nuclear Research, Dubna, Russia

Abstract

Different methods for diagnostic of ultrashort electron bunches are developed at JINR-DESY collaboration within the framework of the FLASH and XFEL projects and JINR participation in the ILC project. The main peculiarity of these accelerator complexes is related to formation of ultrashort electron bunches with r.m.s. length 20÷300 μm. Novel diagnostics is required to provide femtoscale time resolution in the modern FEL like FLASH and future XFEL and ILC projects. Photon diagnostics developed at JINR-DESY collaboration for ultrashort bunches are based on calorimetric measurements and detection of undulator radiation. The MCP based radiation detectors are effectively used at FLASH for pulse energy measurements. The infrared undulator constructed at JINR and installed at FLASH is used for longitudinal bunch shape measurements and for two-color lasing provided by the FIR and VUV undulators. A special magnetic spectrometer is planning to be used in ILC for measurements of average electron energy in each bunch. The first test spectrometer measurements were performed within the JINR-DESY-SLAC collaboration.

ª – corresponding author

Paper Slides

304 

OVERVIEW OF THE NSLS-II CONTROL SYSTEM

N. Malitskyª on behalf of NSLS-II Control Group

Brookhaven National Laboratory, Upton, USA

Abstract

The NSLS-II is a new third-generation storage ring light source being built at the Brookhaven National Laboratory. The control system is designed to convey all monitor, control, model-based, and computed data from all accelerator, facility, safety, and operations subsystems. Integration and development of the distributed components will be based on Experimental Physics and Industrial Control System (EPICS) architecture. The paper discusses requirements, standard-based solutions, and several R&D topics, such as RTEMS real-time operating system, Data Distributed Service middleware, IRMIS project-wide relational database, etc.

ª – corresponding author

No paper Slides

Contribution not received

PECULIARITIES OF BUNCH SHAPE MEASUREMENTS OF H-MINUS BEAMS IN LINEAR ACCELERATORS

A. Denisov¹, A. Feschenkoª¹, A. Aleksandrov²

¹Institute for Nuclear Research of Russian Academy of Sciences, Moscow, Russia

²Oak Ridge National Laboratory, Oak Ridge, USA

Abstract

When measuring a bunch shape of H-minus beam with the bunch shape monitor (BSM) based on a transverse scanning of low energy secondary electrons the difficulties due to presence of detached electrons arise. Fraction of the detached electrons gets into the optical channel of BSM and produce additional signals thus distorting measurement data. The results of simulation of interaction of the electrons with the BSM target and analysis of their subsequent motion in BSM electron optical channel are presented. Distortions of the measurement results are discussed. It is demonstrated both by simulations and experimentally that energy separation of the electrons essentially decreases the distortions. Other possible reasons of errors are also discussed.

ª – corresponding author

Paper Slides

298 

X-RAY STREAK CAMERA OF 10 FS RESOLUTION FOR XFEL

A.M. Tronª

Lebedev Physical Institute of Russian Academy of Sciences, Moscow, Russia

Abstract

X-ray streak camera, based on new principle operation, with resolution of 10 fs for the XFEL project is considered. Main its characteristics and construction features are presented and discussed.

ª – corresponding author

Paper Slides

301