Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 2/16
What I have done
• DDS2 : 9 single cell (half-iris) simulations (with fine mesh)
• Mesh optimisation for dipole simulations
• Efficiency calculations: Non-interleaved and 8-fold interleaved structure
• Three identical cell structure simulation and phase calculation (Floquet theorem)
• Design: Three identical cells with tapered manifold
• Full str. design : 24 detuned cells (full iris) with tapered manifold + beam pipe
• Eigen and driven mode simulations : Full structure
• Thesis : Three chapters done!
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 3/16
No fillet/chamfer yet ?
Mesh : MonopoleVol + Sur + Sur. Appr. + additional2 mm + 1mm + 2μm + 0.5 mm + 0.5 mm
Typical single cell – half iris
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 4/16
2 mm + 1mm + 2μm
Mode # 2Surface approximation only
2 mm + 1mm + 2μm
Mode # 1Surface approximation only
2 mm + 1mm + 2μm
Mode # 3Surface approximation only
Dipole mode mesh optimisation
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 5/16
2 μm
5 μm
15 μm
10 μm
20 μm
Dipole mode mesh optimisation
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 6/16
DDS2 : 9 cell results
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 7/16
DDS2 : 9 cell results
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 8/16
DDS2 : 1 of 8 interleaved structures- to be built
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 9/16
251 Constraint
41
Constraint
<8 structures>
Single structure
<8 structures>
Single structure
DDS2 : RF properties
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 10/16
3 identical cell structure
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 11/16
Cell # 1 Cell # 24Cell # 13
Cell # 1Cell # 24
Cell # 13
3 detuned cell structure
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 12/16
Manifold radius:Erf distribution
Manifold radius:Linear tapering
Manifold radius isconst. in a given cell
40 μm taper in manifold radius in each cell
3 detuned cell structure with erf-distribution in manifold
3 detuned cell structure with tapered manifold
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 13/16
S12 & S21
S11
S22
S12 & S21
S11
S22
3 cell structureManifold radius:Erf distribution
Monopole
Dipole
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 14/16
S12 & S21
S11
S22
S12 & S21
S11
S22
3 cell structureManifold radius:Linear tapering
Monopole
Dipole
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 15/16
S12 & S21
S11
S22
Monopole S12 & S21
S11
S22
Dipole
Full structure 24 detuned cells with tapered manifold and beam pipes
Vasim Khan MEW group meeting, Cockcroft Institute 14.01.10 16/16
I need to understand
• How to use Master-Slave B.C. in asymmetric planes i.e. full iris single cell (beam pipe) in order to understand the effect of 40 micron taper in a manifold
• Full str. simulation ...I have problems in getting all 24 modes
• Phase calculation for a detuned structure....Floquet’s theorem is not applicable here
• Tuning 24 cell detuned structure with beam pipes & 2 matching cells
• S-parameters and driven modal simulations