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A Study of Beam Position Diagnostics with Beam-excited Dipole Higher Order Modes using a Downconverter Test Electronics in Third Harmonic 3.9 GHz Superconducting Accelerating Cavities at FLASH | | P. Zhang
; N. Baboi
; N. Eddy
; B. Fellenz
; R.M. Jones
; B. Lorbeer
; T. Wamsat
; M. Wendt
; | | Date: |
Fri, 10 Aug 2012 09:13:45 GMT (11858kb,D) | | Abstract: | Beam-excited higher order modes (HOM) in accelerating cavities contain
transverse beam position information. Previous studies have narrowed down three
modal options for beam position diagnostics in the third harmonic 3.9 GHz
cavities at FLASH. Localized modes in the beam pipes at approximately 4.1 GHz
and in the fifth cavity dipole band at approximately 9 GHz were found, that can
provide a local measurement of the beam position. In contrast, propagating
modes in the first and second dipole bands between 4.2 and 5.5 GHz can reach a
better resolution. All the options were assessed with a specially designed test
electronics built by Fermilab. The aim is to define a mode or spectral region
suitable for the HOM electronics. Two data analysis techniques are used and
compared in extracting beam position information from the dipole HOMs: direct
linear regression and singular value decomposition. Current experiments suggest
a resolution of 50 {mu}m accuracy in predicting local beam position using
modes in the fifth dipole band, and a global resolution of 20 {mu}m over the
complete module. Based on these results we decided to build a HOM electronics
for the second dipole band and the fifth dipole band, so that we will have both
high resolution measurements for the whole module, and localized measurements
for individual cavity. The prototype electronics is being built by Fermilab and
planned to be tested in FLASH by the end of 2012. | | Source: | arXiv, 1208.2122 | | Services: | Forum | Review | PDF | Favorites | |
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