Beam Position Monitoring with Cavity Higher Order Modes in the Superconducting Linac FLASH Page: 1 of 6
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1.1 Beam Position Monitoring with Cavity Higher Order Modes in
the Superconducting Linac FLASH*
Nicoleta Baboi1, Stephen Molloy2, Nathan Eddy3, Josef Frisch2, Linda Hendrickson2,
Olaf Hensleri, Doug McCormick2, Justin May2, Sergei Nagaitsev3, Olivier Napoly4,
Rita Paparella4, Lyudvig Petrosyan, Luciano Piccolli3, Ron Rechenmacher3,
Marc Ross2, Claire Simon4, Tonee Smith2, Ken Watanabe5 and Manfred Wendt3
1DESY, Hamburg, Germany, 2SLAC, Menlo Park, CA, U.S.A., 3FNAL, Batavia, IL,
U.S.A., 4CEA, DSM/DAPNIA, Gif-sur-Yvette, France, 5KEK, Tsukuba, Japan
mail to: email@example.com
DESY, MDI Group, Notkestr. 85, 22607 Hamburg, Germany
FLASH (Free Electron Laser in Hamburg ) is a user facility for a high intensity
VUV-light source . The radiation wavelength is tunable in the range from about 40 to
13 nm by changing the electron beam energy from 450 to 700 MeV. The accelerator is
also a test facility for the European XFEL (X-ray Free Electron Laser) to be built in
Hamburg  and the project study ILC (International Linear Collider) . The
superconducting TESLA technology is tested at this facility, together with other
18.104.22.168 The TESLA cavity
The TESLA cavities are used for acceleration in FLASH and the XFEL. The ILC
will have similar accelerating structures. The TESLA cavities are superconducting 9-
cell 1 m long structures (see Figure 1). A 1.3 GHz wave is input through a power
coupler. Two HOM (Higher Order Modes) couplers extract energy from the resonant
fields excited by the electron beams .
pick up flange
HOM coupler Ipowr_ up
flange 't15.4mnt power coupler
(rotatedl by 65) flange
Figure 1: The TESLA cavity.
The HOMs are fields excited by the beam, which act back on the beam and can
*Work supported in part by the US Department of Energy Contract DE-AC02-76SF00515 and by the
European Community FP6 "Structuring the European Research Area" programme (CARE, contract
The accelerator was known until recently as the VUV-FEL (VUV Free Electron Laser) and TTF2
(TESLA Test Facility - Phase 2)
Submitted to ICFA Beam Dyn.Newslett.
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Baboi, N.; Molloy, S.; Eddy, N.; Frisch, J.; Hendrickson, L.; Hensler, O. et al. Beam Position Monitoring with Cavity Higher Order Modes in the Superconducting Linac FLASH, article, March 20, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc882604/m1/1/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.