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

Session

Impedances and Instabilities (continue)

7

16 Jan 2014, 10:55

Synchrotron SOLEIL

Description

Chairman: Giovanni RUMOLO (CERN)

10. Recent Developments in Wakefield and Impedance Computations

Boris PODOBEDOV (BNL)

16/01/2014, 10:55

(Review) This talk will review some recent developments in the area of wakefield and impedance calculations. Both for modern light sources and colliding machines these developments were mostly motivated by harder-to-deliver (or more exotic) beam parameters as well as more stringent requirements coming from beam dynamics and other machine constraints. After reviewing these, the talk will...

11. Impedance Optimization and Wakefield Codes Comparison for the Brazilian Light Laboratory

Henrique de Oliveira Caiafa DUARTE (LNLS)

16/01/2014, 11:30

For the future 3rd Generation Brazilian Light Source, Sirius, an evaluation of several electromagnetic simulation software was done, motivated by the small ~3 mm Sirius bunch length. User interface was analyzed on CST, ACE3P and GdfidL and their numerical errors were compared with ECHO code. Impedance optimization of some components will be shown as well.

12. Longitudinal impedance characterisation of the CLIC stripline in view of its in the ALBA storage ring

Thomas Guenzel (CELLS/ALBA)

16/01/2014, 11:50

In the framework of a collaboration between the CLIC project at CERN and CELLS a 1.7m long prototype stripline will be tested in the ALBA storage ring. The power loss of the stripline flanged to the ALBA vacuum pipe is computed under consideration of an external load connected to the feedthroughs. Although the total power loss at 400mA is still significant (78W), the external load consumes 58W...

13. Geometric Beam Coupling Impedance of LHC Collimators

Oscar Frasciello (I)

16/01/2014, 12:10

The High Luminosity LHC project (HiLumi LHC) is aimed at increasing the LHC luminosity by an order of magnitude. One of the key ingredients to achieve the luminosity goal is the bunch (and beam) intensity increase. In order to keep under control harmful beam instabilities and to avoid excessive power losses in these conditions a careful design of new vacuum chamber components and an update and...

14. Short-range wake field studies

Galina SKRIPKA (Univ. of Lund)

16/01/2014, 12:30

In order to maintain the high quality of the beam it is crucial to study the effect of the wake fields on the bunches. The linear accelerators often require extreme stability of the beam parameters such as emittance and energy spread. Using the scheme recently proposed by B. Podobedov and G. Stupakov the short-range wake fields are investigated with MAX IV linac as an example. MAX IV linac...