Broadband impedance of the NESTOR storage ring

Details Broadband impedance of the NESTOR storage ring Broadband impedance of the NESTOR storage ring

2010-06-24

arxiv.org/abs/1006.4846v1

Physics

Accelerator Physics

16 pages, 8 figures, 4 tables

Scientific paper

We have estimated contributions from the lossy and inductive vacuum chamber omponents to the broadband impedance of the NESTOR storage ring by using analytical formulas. As was expected considering the small ring circumference (15.44m), the main contributions both to the longitudinal impedance Z/n and the loss factor k come from the RF-cavity. Cavity impedance was also estimated with CST Microwave Studio (CST Studio Suite{TM} 2006) by simulating coaxial wire method commonly used for impedance measurements. Both estimates agree well. The upper limit of impedance of elliptic holes in the vacuum chamber of dipole magnet were also obtained with this approach. We have also evaluated the bunch length in NESTOR taking the conservative estimate of 3 Ohm for the ring broadband impedance and have found that the bunch length sigma_z= 0.5 cm could be obtained for the designed bunch current of 10 mA and RF-voltage of 250 kV.

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