Update on TDIS impedance simulations jaw coatings flanges
- Slides: 23
Update on TDIS impedance simulations: jaw coatings, flanges coating, anti-scratching glassy -carbon sheet Giacomo Mazzacano Acknowledgments: N. Biancacci, D. Carbajo, E. Metral, B. Salvant, L. Teofili
Several potentially upcoming changes for TDIS Addition of a glassy carbon sheet to protect graphite blocks from scratching Removal of the copper coating in the flanges Coating the Cu/Ti block with NEG or Amorphous Carbon
Several potentially upcoming changes for TDIS Addition of a glassy carbon sheet to protect graphite blocks from scratching Removal of the copper coating in the flanges Coating the Cu/Ti block with NEG or Amorphous Carbon Impact on Impedance ?
Several potentially upcoming changes for TDIS Addition of a glassy carbon sheet to protect graphite blocks from scratching Removal of the copper coating in the flanges Coating the Cu/Ti block with NEG or Amorphous Carbon Impact on Impedance ?
Motivation A glass-like carbon sheet would prevent the Absorbing block fingers from scratching the graphite block, UFO should be avoided 2 mm thickness, 45 u. Ohm*m 65 mm) . 7 m (3 x 15 gth 4 Active len Courtesy of D. Perez Glassy carbon sheet 0. 7 m Copper 0. 9 m Titanium Low Z jaws (2 blocks of graphite per jaw)
CST model TDIS front, tank TDIS front, jaws TDIS transverse section Glassy sheet installed where the RF Fingers are touching the graphite blocks
Longitudinal Impedance 5 mm Half-gap Wake Impedance, Real Part Eigenmode simulations
Longitudinal Impedance 25 mm Half-gap Wake Impedance, Real Part Eigenmode simulations
Longitudinal Impedance 55 mm Half-gap Wake Impedance, Real Part Eigenmode simulations Consistent discrepancy to be further analyzed in eigenmode solutions
Several potentially upcoming changes for TDIS Addition of a glassy carbon sheet to protect graphite blocks from scratching Removal of the copper coating in the flanges Coating the Cu/Ti block with NEG or Amorphous Carbon Impact on Impedance ?
Motivation gth 4. 7 m Active len 0. 7 m Copper 0. 9 m Titanium (3 x 1565 mm) Low Z jaws (2 blocks of graphite per jaw) Defect observed on the flanges coating (unknown reason) Courtesy of D. Perez
CST model Stainless Steel Different materials were simulated: Copper and Stainless Steel Copper
Longitudinal Impedance 5 mm Half-gap Real Part Longitudinal Impedance 25 mm Half-gap Real Part
Longitudinal Impedance 55 mm Half-gap Real Part
Shunt Impedance 5 mm half-gap Shunt Impedance evaluated between 1. 2 and 1. 4 GHz Only the modes linked to the transitions are affected
Quality Factor 5 mm half-gap
Several potentially upcoming changes for TDIS Addition of a glassy carbon sheet to protect graphite blocks from scratching Removal of the copper coating in the flanges Coating the Cu/Ti block with NEG or Amorphous Carbon Impact on Impedance ?
Motivation Electron cloud incompatibility Possible NEG or Amorphous Carbon coatings for Copper and Titanium blocks
Comparison between NEG coating and no-coating (dashed line) for different layer thicknesses. Longitudinal Impedance
Comparison between NEG coating and no-coating (dashed line) for different layer thicknesses. Transverse Impedance
Comparison between a. C coating and no-coating (dashed line) for different layer thicknesses. Longitudinal Impedance
Comparison between a. C coating and no-coating (dashed line) for different layer thicknesses. Transverse Impedance
Conclusions Overall damping effect for glassy sheets installed to protect the graphite for 5 mm and 25 mm half-gaps, discrepancy detected in 55 mm half-gap Small contribution to impedance given by copper coatings removal in the flanges: impact only on locally trapped modes, no overall contribution Overall negligible impact of Amorphous Carbon and NEG coatings on the Ti/Cu block
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