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SPS WIRE SCANNER IMPEDANCE AND WIRE HEATING STUDIES. E. Piselli, O. E. Berrig, F. Caspers, B. Dehning, J. Emery, M. Hamani, J . Kuczerowski, B. Salvant, R. Sautier, R. Veness, C. Vuitton, C. Zannini. Impedance Meeting 19/05/2014. Motivations. - PowerPoint PPT Presentation
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SPS WIRE SCANNER IMPEDANCE AND WIRE HEATING STUDIES
Impedance Meeting19/05/2014
E. Piselli, O. E. Berrig, F. Caspers, B. Dehning, J. Emery, M. Hamani,J. Kuczerowski, B. Salvant, R. Sautier, R. Veness, C. Vuitton, C. Zannini
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Motivations
CERN-SPS WIRE SCANNER IMPEDANCE AND WIRE HEATING STUDIESE. Piselli, O. E. Berrig, F. Caspers, B. Dehning, J. Emery, M. Hamani,
J. Kuczerowski, B. Salvant, R. Sautier, R. Veness, C. Vuitton, C. ZanniniCERN, Geneva, Switzerland
This article describes a study performed on one of the SPS vertical rotational wire scanners in order to investigate the breakage of the wire, which occurred on several occasions during the last year of operation. The thermionic emission current of the wire was measured to evaluate temperature changes, and was observed to rise significantly as the wire approached the ultimate LHC beam in the SPS, indicating the possibility of strong coupling between the beam’s electromagnetic field and the wire. Different laboratory measurements, complemented by CST Microwave Studio simulations, have therefore been performed to try and understand the RF modes responsible for this heating. These results are presented here, along with the subsequent modifications adopted on all of the operational SPS wire scanners.
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SPS BWS416
beamV BWS H BWS
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SPS Vertical BWS416
Vertical insertionplate
W wire(Fritz)
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Measurements
Vertical BWS
Horizontal BWSProbe
HybridΣ Δ
0-2GHz
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Measurements
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Measurements
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Measurements
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Measurements
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Measurements
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Measurements
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Measurements
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Measurements
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Measurements
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Measurements
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Measurements
Sum 15cm out
Diff15cm out
200-400MHz
HOME IN
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Measurements
Sum 15cm out
Diff15cm out
600-800MHz
INHOME
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Measurements
Sum 25cm out
Diff25cm out
200-400MHz
HOME IN
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Measurements
Sum 25cm out
Diff25cm out
600-800MHz
HOME IN
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Simulations
Diff25cm out
Sum25cm out
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Conclusions
• The tungsten wire insertion seems to improve an average of 7dB
• The insertion plates have a stronger effect at high frequencies
• Simulations seems to follow quite the measurements
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Emiliano
Grazie
