| Paper |
Title |
Page |
| MOPP115 |
Production and Qualification of Low Thermal Conduction Suspension Supports for the Cold Mass of Long Superconducting Acceleration Modules
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829 |
| |
- S. Barbanotti, M. Bonezzi, M. Todero
INFN/LASA, Segrate (MI)
- C. Engling, K. Jensch, R. Mattusch
DESY, Hamburg
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A post is an assembly of a low thermal conduction composite material pipe (fiberglass pipe) and some shrink-fit aluminum and steel discs and rings, designed to provide a mechanical support and a thermal insulation to the cold mass of the long cryomodules of the TTF, which are foreseen also for the XFEL and ILC. We review here the production, testing and qualification for the production of post supports, which have been successfully provided for the cryomodules of the TTF in DESY, the STF in KEK and ILCTA in FNAL.
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| MOPP120 |
Full Characterization of the Piezo Blade Tuner for Superconducting RF Cavities
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838 |
| |
- A. Bosotti, C. Pagani, N. Panzeri, R. Paparella
INFN/LASA, Segrate (MI)
- C. Albrecht, K. Jensch, R. Lange, L. Lilje
DESY, Hamburg
- J. Knobloch, O. Kugeler, A. Neumann
BESSY GmbH, Berlin
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Cavity tuners are mechanical devices designed to precisely match the resonant frequency of the superconducting (SC) cavity to the RF frequency synchronous with the beam. The blade tuner is mounted coaxially to the cavity and changes the resonator frequency by varying its length. A high tuning range is desired together with small mechanical hysteresis, to allow easy and reproducible resonator setup operations. High stiffness is also demanded to the tuner system both to ensure mechanical stability and to mitigate the frequency instabilities induced by perturbations. In high gradient SC resonators, the main sources of resonant frequency instability are the Lorentz Force Detuning (LFD) under pulsed mode operation, and the microphonic noise, in continuous wave (CW) with high loaded quality factors. Piezoceramic elements add dynamic tuning capabilities to the system, allowing fast compensation of these instabilities with the help of feed-forward and feedback loops. The piezo blade tuner has been extensively tested both at room temperature and at cold once assembled on a TESLA type cavity in its final configuration. This paper presents the summary of the complete characterization tests.
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| WEPD038 |
Thermal and Structural Modeling of the TTF Cryomodule Cooldown and Comparison with Experimental Data
|
2494 |
| |
- S. Barbanotti, P. Pierini
INFN/LASA, Segrate (MI)
- K. Jensch, R. Lange, W. Maschmann
DESY, Hamburg
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The study of thermal and structural behavior during cooldown/warmup of long SRF cryostats is important for both the XFEL and ILC, which base the design on the successful TTF design. We present the finite elements analysis of the main internal components of the cryomodules during the transient cooldown and warmup, comparing the data obtained with data taken at DESY on the linac.
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