SPS flanges Simulations & Measurements Update Fritz Caspers and Jose E. Varela.

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Presentation transcript:

SPS flanges Simulations & Measurements Update Fritz Caspers and Jose E. Varela

Outline Introduction Impedance List Update Damping Resistors in Simulations Conclusions

Introduction We continue to search for possible causes of the suspected 1.4GHz microwave instability in the SPS. Last element of the list was simulated and impedance has been included in the table. Small study on the possibility of including the damping resistors in simulations has been carried out.

Outline Introduction Impedance List Update Damping Resistors in Simulations Conclusions

Total Flange Impedance Flange Type EnamelBellow N um. of elements Freq. [GHz] ImpedanceQR/Q [Ω]Resistor BPV-QDYes kΩ No BPH-QFYes MΩ Long QF-MBAYes MΩ Short MBA-MBAYes kΩ Short QF-QFNoYes MΩ Short QD-QDYesNo kΩ55317No QF-QFNo kΩ980600No BPH-QFYes kΩ Long QD-QDNo kΩ881739No QD-QDYesNo kΩ No No damping resistors included in simulations. The ‘Resistor’ column states whether or not each element should have a resistor.

Outline Introduction Impedance List Update Damping Resistors in Simulations Conclusions

Damping Resistor DC Measurement A 4-wire DC measurement was taken on a long damping resistor as shown in the Figure. The measured resistance was 160Ω. A conductivity value of 15.7 S/m for the Nickel-Chrome layer was deduced from the measured value.

Damping Resistor in Simulations Simulation no Resistor Simulation with Resistor Meas. no Resistor Meas. with Resistor f [GHz] (-0.68%) (-0.42%) Q0Q The volume of the resistor represents around 1.5% of the total cavity volume. 6% rel. error

Outline Introduction Impedance List Update Damping Resistors in Simulations Conclusions

All the elements in the original flange list have been analysed. The impedance, Q and R/Q values have been provided for the bigger resonances. A ‘calibration’ of the conductivity value to be used in simulations for the Nickel-Chrome has been carried out.