Type IV Cryomodule (T4CM) Vibration Analysis Update January 23, 2007 Mike McGee 3 rd T4CM Meeting at INFN-Milan

Courtesy of DESY DESY Cryomodule Measurements Mike McGee, 23 Jan rd T4CM Meeting at INFN-Milan

Courtesy of DESY ANSYS Model Validation Mike McGee, 23 Jan 2007  Applying Harmonic Study (involving measured frequencies & displacements) using CMS Method  Using DESY measurement (as input) and comparing ANSYS output to corresponding (transfer function) DESY measurement 3 rd T4CM Meeting at INFN-Milan

Courtesy of DESY DESY Measurement Transfer Functions Mike McGee, 23 Jan ) Vacuum Vessel Top vs HeGRP 1) Ground vs Vacuum Vessel Top 3) HeGRP vs Quad 3 rd T4CM Meeting at INFN-Milan

Courtesy of DESY TTF Single ANSYS Model Applied Mike McGee, 23 Jan rd T4CM Meeting at INFN-Milan Example: Transfer function between HeGRP and Quad Consider the DESY vertical measurement, by applying sine wave input with displacement (amplitude) at specific frequencies.

Courtesy of DESY Vertical Excitation & Response Mike McGee, 23 Jan rd T4CM Meeting at INFN-Milan Correlation Area Two signals can be correlated:

Courtesy of DESY ANSYS TTF Model Results Mike McGee, 23 Jan rd T4CM Meeting at INFN-Milan ANSYS model predicts the DESY measurement to within ~ 30% in most cases 24% 28% 34% Resonant frequencies found using modal analysis

Courtesy of DESY TTF Modal Shapes Mike McGee, 23 Jan rd T4CM Meeting at INFN-Milan

Courtesy of DESY Transverse Excitation & Response Mike McGee, 23 Jan 2007 Correlation Area 3 rd T4CM Meeting at INFN-Milan

Courtesy of DESY Modal Shapes of Resonant Frequencies Mike McGee, 23 Jan rd T4CM Meeting at INFN-Milan A very weak correlation transversely

Courtesy of DESY Model Improvement and Further Measurement Mike McGee, 23 Jan rd T4CM Meeting at INFN-Milan  Slight damping initially considered in ANSYS model  Promising prediction of actual DESY vibration measurements have been realized, however continued measurements are needed  Ringing measurements at DESY are needed to define system damping estimate

Modal Analysis (fixed-fixed) Summary Mike McGee, 23 Jan rd T4CM Meeting at INFN-Milan Lowest (fundamental) frequency vertical with longitudinal mode shape is not present. T4CMTTF f (Hz)Modal Shapef (Hz)Modal Shape Vertical w/ Longitudinal 12.7Transverse Pendulum12.4Transverse Pendulum 16.3Transverse S-shape15.7Transverse S-shape 17.9Transverse S-shape19.2Transverse S-shape

Courtesy of DESY 3-in-Series w/ ends: Fixed-Fixed Mike McGee, 23 Jan 2007 TTF ModelT4CM Model 12.7 Hz12.4 Hz 3 rd T4CM Meeting at INFN-Milan

Courtesy of DESY Mike McGee, 23 Jan 2007 TTF ModelT4CM Model 3-in-Series w/ ends: Fixed-Fixed 15.7 Hz16.3 Hz 3 rd T4CM Meeting at INFN-Milan

Courtesy of DESY Mike McGee, 23 Jan 2007 TTF ModelT4CM Model 3-in-Series w/ ends: Fixed-Fixed 19.2 Hz17.9 Hz 3 rd T4CM Meeting at INFN-Milan

Courtesy of DESY Fermilab Website Mike McGee, 23 Jan rd T4CM Meeting at INFN-Milan ANSYS Results given in picture and movie files ANSYS Input Code files Measurements

Future Work  Perform more specific vibration measurement on TTF cryomodule at DESY  Begin Sensitivity Studies using T4CM model Mike McGee, 23 Jan rd T4CM Meeting at INFN-Milan