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