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CLIC_DDS2HPT11.03.2010

V. Khan

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Cell#1 Cell#2 Cell#5

Cell#9 Cell#13 Cell#17

Cell#21 Cell#23 Cell#24

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24 cellsNo interleaving

∆fmin = 62.3 MHz∆tmax =16.05 ns∆s = 4.81 m

24 cellsNo interleaving

Undamped

Damped

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Scanning a’s and g’s for a min S11

N=1

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S. Tantawi method

│S22│=0.9527 ϕ22=179.65

CLIC_DDS2HPTCell#1

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NextTask Feb Mar Apr May-Jul Sept Oct

onwards

Finalising 9 regular cells for the 1st str.

Done

Matching end cells In progress

HFSS: Full structure(N+2 cells) simulations

To do

Comparison of results (wakefield)in GdfidL

Mechanical design & fabrication (?)

Thesis writing-submission to RMJ

To do

Thesis submission to Uni.

Vasim Khan MEW group meeting, Cockcroft Institute 11.03.10 11/10

Back up slides

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DDS1 : Plain curve ; DDS2 : Curve with dots

Dipole mode : circuit parameters

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DDS2_HPT : Surface fields

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DDS2_HPT : RF properties

Max. Values

Esur=220 MV/m∆T = 51 deg.Pin= 70.8Eacc_UL=131 MV/mSc=6.75 W/μm2

RF-beam-eff=23.5%

∆T

35*Sc

Esur

Eacc

Pin

Dashed curves : Unloaded conditionSolid curves: Beam loaded condition

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Matching cell design

• Two options• Vary a and b : very small room to vary b vary a and L

L

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N=1a: 4-6 mm N=2

a: 4-6 mm

N=3a: 4-6 mm

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N=1a: 4.4-4.6 mm N=2

a: 4.4-4.6 mm

N=3a: 4.4-4.6 mm

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NextTask Feb Mar Apr May-Jul Sept Oct

onwards

Finalising 9 regular cells for the 1st str.

Done

Matching end cells In progress

HFSS: Full structure(N+2 cells) simulations

To do

Comparison of results (wakefield)in GdfidL

Mechanical design & fabrication (?)

Thesis writing-submission to RMJ

To do

Thesis submission to Uni.

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)/(E

ESImagSReS 2

2

cell singleacc

ULureacc_struct

61

c mW

Where S= Poynting vector

@ 95 MV/m

Cell # 1

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@ 138 MV/m

Cell # 24

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DDS2_HPT structure

Cell Eacc Q R’/Q vg/c Es/Eacc Hsur/Eacc Sc/Eacc2

# (V/m) kΩ/m (%) mA/m W/(x10-4)

1 0.4488 5020 10.179 2.07 2.23 4.9 7.3

2 0.4563 5091 10.649 1.85 2.2 4.82 6.9

5 0.4882 5325 11.723 1.62 2.05 4.5 5.5

9 0.5255 5604 12.899 1.51 1.89 4.15 4.5

13 0.5555 5838 13.952 1.42 1.8 4.0 4.0

17 0.5828 6061 15.049 1.34 1.7 3.75 3.4

21 0.6021 6307 16.416 1.22 1.66 3.5 2.9

23 0.4217 6451 17.411 1.11 1.65 3.3 2.9

24 0.5749 6534 18.130 1.0 1.67 3.3 2.98

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Cell # 1

Cell # 24