Analysis of the HOM Damping with Modulated Beam in the First Prototype of Superstructure
- SLAC
Superstructures, groups of weakly coupled cavities fed through a single power coupler, are currently investigated as a more cost effective alternative to the 9-cell TESLA cavities. Two Nb prototypes of the superstructure have been built, consisting of two 7-cell cavities, and installed in the TESLA Test Facility at DESY. The HOM damping of these superstructures has been investigated with a modulated beam using the method described in [1]. A charge modulation imposed on the 54 MHz bunch train excites HOM at frequencies n {center_dot} f{sub b} {approx_equal} f{sub mod}, where n is an integer, f{sub b} = 54MHz is the bunch frequency and f{sub mod} is the charge modulation frequency between 0.5 and 27 MHz. The effects of the excited HOMs on the beam transverse position are observed at a downstream BPM, followed by a direct analysis of the modes at the HOM couplers.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 815254
- Report Number(s):
- SLAC-PUB-10108
- Country of Publication:
- United States
- Language:
- English
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