Thomas Weiland

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  • M Woods, R Erickson, J Frisch, C Hast, R K Jobe, L Keller +56 others
  • 2005
The SLAC Linac can deliver damped bunches with ILC parameters for bunch charge and bunch length to End Station A. A 10Hz beam at 28.5 GeV energy can be delivered there, parasitic with PEP-II operation. We plan to use this facility to test prototype components of the Beam Delivery System and Interaction Region. We discuss our plans for this ILC Test Facility(More)
  • V Ayvazyan, N Baboi, J Bähr, V Balandin, B Beutner, A Brandt +122 others
  • 2006
Many scientific disciplines ranging from physics, chemistry and biology to material sciences, geophysics and medical diagnostics need a powerful X-ray source with pulse lengths in the femtosecond range 1-4. This would allow, for example, time-resolved observation of chemical reactions with atomic resolution. Such radiation of extreme intensity, and tunable(More)
The optimization of continuous parameters in electrotechnical design using electromagnetic field simulation is already standard. In this paper, we present a new sequential modelling approach for mixed-integer simulation-based optimization. We apply the method for the optimization of integer-and real-valued geometrical parameters of the coils of a(More)
  • N K Watson, D Adey, M C Stockton, Birmingham Y Univ, Kolomensky, D Angal-Kalinin +35 others
  • 2006
Precise collimation of the beam halo is required in the International Linear Collider (ILC) to prevent beam losses near the interaction region that could cause unacceptable backgrounds for the physics detector. The necessarily small apertures of the collimators lead to transverse wake-fields that may result in beam deflections and increased emittance. A set(More)
Within the design work of FAIR, beam-stability analyses play a important role. One relevant unknown is the beam response to the kicker modules. Here we report our numerical investigations of the respective longitudinal and transverse impedances, defined by Z || (ω) = 1 q 2 d 3 xE · J * ext Z x,y (ω) = i q 2 ∆ d 3 xρ ⊥ · (E x,y ∓ vB y,x), where the(More)
In the cavities and finite cell structures, ultra short bunches excite very high frequency electromagnetic fields. A fraction of these fields stay in the structure for a very long time. After several reflections another part leaves the structure. The rest part is chasing the bunch. In a time, this field will catch the bunch and take its kinetic energy. The(More)
In the Linear Colliders FEL projects ultra short bunches are foreseen to be used. In addition to usual wakefields, coming from irregularities in the chamber, these bunches excite fields in transporting lines and undulators due to the surface roughness. This effect can be large for the extruded tubes, usually used in accelerators. Based on computer results(More)