Influence of Resistive Wall Impedance on the Vsx Light Source
نویسنده
چکیده
We describe the calculated resistive wall impedance of the vacuum chamber and the corresponding growth rate of coupled-bunch instabilities for the VSX light source, a Japanese third generation VUV and soft X-ray source with a beam energy of 2 GeV. The impedance calculation was performed for the normal Al vacuum duct and the SiC duct, a higher-order mode (HOM) absorber of the damped RF cavity. The impedance of the Al vacuum duct with a narrow vertical aperture is sufficiently high at low frequencies for exciting a transverse coupled-bunch instability. On the other hand, the SiC duct does not cause a serious problem about coupled-bunch instabilities and it gives only a small contribution to the broad-band impedance related to single-bunch instabilities.
منابع مشابه
A Novel Resistive Capacitive Feedback Trans-impedance Amplifier Optimization Using IPSO Algorithm
A novel low noise trans-impedance amplifier is proposed using low cost 0.18 µm CMOS technology. A resistive-capacitive feedback is used to extend the bandwidth of the amplifier. As the structure is inductor less, it is suitable for low cost integrated optical interconnects. In this paper Improved Particle Swarm Optimization have applied to determine optimal trans-resistance and noise of propose...
متن کاملCoupled - Bunch Beam Breakup due to Resistive - Wall Wake ∗ Jiunn -
The coupled-bunch beam breakup (bbu) problem in a periodic linac excited by the resonance wake is well understood [1–3]. However, there are no systematic studies for the corresponding problem excited by the resistive wall impedance. This study of the resistive wall bbu problem is necessitated by the recently proposed PERL project [4]. For PERL, the light source consists of twelve undulators, ea...
متن کاملInvestigation of Resistive Wall Instability in the 7-GeV APS Storage Ring
The Advanced Photon Source (APS) storage ring is a 7-GeV light source with 40 straight sections. Intense x-ray beams will be delivered by 34 insertion devices installed in these straight sections. The vacuum chamber for the insertion devices has an elliptical cross section with the gap equal to 8 mm. With this narrow gap, we estimate that the transverse impedance of the ring at the revolution f...
متن کاملA two-phase model of blood flow in a stenosed artery under the influence of external magnetic field
A two-phase macroscopic model of blood in a stenosed catheterized artery under the influence of external transverse magnetic field is studied. The governing partial differential equations of the physical problem are solved analytically. The important blood flow characteristics in arteries namely resistive impedance and wall shear stress are discussed for various governing parameters like Hemato...
متن کاملTheoretical Analysis of Metamaterial Insertions for Resistive-wall Beam-coupling Impedance Reduction
Resistive-wall impedance usually constitutes a significant percentage of the total beam-coupling impedance budget of an accelerator. Reduction techniques often entail high electrical-conductivity coatings. This paper investigates the use of negative-permittivity or negative-permeability materials for sensibly reducing or theoretically nearly cancelling resistive-wall impedance. The proposed app...
متن کامل