The ANKA storage ring offers different operation modes including the short-bunch mode with bunch lengths tuned down to a few picoseconds. This can lead to the occurrence of micro-bunching instabilities coupled to the emission of coherent synchrotron radiation (CSR) in so-called ’bursts’. To study this CSR instability we use several turn-by-turn enabled detector systems to synchronously measure ...

This paper presents an overview of the bunch-by-bunch feedback kickers designed for the BESSY II storage ring. Simulation results for the longitudinal kicker cavity and for the transverse stripline kicker are discussed.

We present initial experimental results showing the excitation of plasma wakefields by a train of two drive bunches. These wakefields are experienced by a trailing witness bunch that gains energy while retaining a finite energy spread. These well controlled plasma wakefield accelerator (PWFA) experiments are important to test the theory of the PWFA and serve as a testbed for techniques that wil...

Volume fraction of fibres (A), aspect ratio of fibres (B) and fibres orientation (C) are considered as control factors in the determination of hardness strength, hardness strength of plantain fiber reinforced polyester composites (PFR P). These properties were determined for plantain empty fruit bunch (PEFB) and plantain pseudo stem (PPS). Hardness tests were conducted on the replicated samples...

A 100 MeV ‘turn-key’ injector electron linac for the Swiss Light Source (SLS) is under construction at ACCEL Instruments. The system will be installed, commissioned and handed over to the SLS in late 1999, after a 18 month design and production period. This paper will present the special needs of an injector for a third generation synchrotron light source and the two specific modes of operation...

the date palm bunch fading disorder/disease is one of the greatest challenges faced by date palm growers. in the present study, the effect of appropriate orchard management on some qualitative and quantitative features of date palm bunch was studied. for this purpose, two orchards of cv ‘kabkab’ with a history of previous incidence were selected in two districts of bushehr province; tangestan a...

abstract tuberose is one of the most important cut flowers in iran and the world. in this experiment, effect of microelements fe, zn, cu and mn on inflorescence length, inflorescence bunch length, number and diameter of floret, diameter of inflorescence bunch and vase life of tuberose flowers were studied. this study was based on four separate completely randomized experimental design with four...

In the LHC beam pipe, an electron cloud can build up due to photoemission from synchrotron radiation and via a beam-induced multipacting process. This electron cloud gives rise to an additional heat load on the beam screen which protects the cold bore of the superconducting magnets. The heat load from the electron cloud depends on beam parameters such as the bunch intensity, the number of bunch...

A traveling wave transverse rf deflecting structure is discussed as a tool for bunch length measurement and as an aid to detailed phase space diagnostics in future FEL projects. The high frequency time variation of the deflecting fields is used to ‘pitch’ or ‘yaw’ the electron bunch where the resulting transverse beam width measured on a simple profile monitor represents a reliable, single-shot...

In this paper, we discuss ion effects relevant to future storage rings and linear colliders. We ®rst review the conventional ion effects observed in present storage rings and then discuss how these effects will differ in the next generation of rings and linacs. These future accelerators operate in a new regime because of the high current long bunch trains and the very small transverse beam emit...