Topical Workshop on Instabilities, Impedance and Collective Effects 2014 (TWIICE2014)

Session

Impedances and Instabilities

12

17 Jan 2014, 08:30

Synchrotron SOLEIL

Description

Chairman: Boris PODOBEDOV (BNL)

25. Impact of Harmonic RF Sysytems on Beam Dynamics in Ultimate Storage Rings

John BYRD (LBNL)

17/01/2014, 08:30

(Review)

26. Investigation of transverse beam instabilities in the MAX IV 3 GeV ring using the multibunch code mbtrack

Marit Klein (Soleil)

17/01/2014, 09:05

We developed a macroparticle multibunch tracking code called mbtrack which can account for various collective effects as resistive wall and geometric ring impedance, multiple cavities either active or passive and even ion beam interaction. Besides the presentation of the code's main features we take the MAX IV 3 GeV storage ring as an example to demonstrate its capabilities. The new MAX IV...

30. Impedance Optimization of Small Gap Chambers for the High Single Bunch Current Operation at APS

Yong-Chul CHAE (APS)

17/01/2014, 09:25

The high intensity per single bunch is required for the timing mode x-ray users at the APS. In order to keep 16-mA operation with the new smaller gap ID chambers we need to reduce the impedance of the chamber through optimization. In this talk we described the impedance reduction process which resulted in the engineering design for the new 5-mm gap chamber to be installed in September 2014.

9. The impedance localization method: theory, measurements and predictions for accelerator machines

Nicolo Biancacci (Universita e INFN, Roma I (IT))

17/01/2014, 09:45

The beam coupling impedance leads to limitations in beam brightness and needs accurate quantification and continuous monitoring in order to detect and mitigate high impedance sources. In the CERN hadron accelerators, kickers and collimators are expected to be major contributors to the total imaginary part of the machine transverse impedance. In order to detect other sources, beam based...

29. Impact of Incoherent Transverse Wake Field on Storage Ring Optics

Pascale BRUNELLE (Synchrotron SOLEIL)

17/01/2014, 10:05

In third generation synchrotron light sources such as SOLEIL, the large number of small gap insertion devices imposes vertical limitations of the vacuum chamber aperture. The former induce an incoherent transverse wake field due to the resistive-wall effect in flat chambers and lead to betatron tune variation with stored current and an optical function symmetry break. Since at SOLEIL, the...