Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 1/6

CLIC_DDS2HPT18.03.2010

V. Khan

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 2/6

24 cellsNo interleaving

24 cellsNo interleaving

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

Undamped

Damped

CLIC_DDSHPT

Qavg ~1700

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 3/6

S. Tantawi method│S22│=0.9527 ϕ22=179.65

CLIC_DDSHPT Cell#1

N=1

N=2

N=3

Regular cellMatching cell

Port1 Port2

Port1

Port2 ??

Port2 ??

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 4/6

bg a

Other method

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 5/6

Matching cell #1

ma,mg : 2 micro steps270 simulations

In progressma,mg : 1 μm steps69/165 simulations

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 6/6

Short term goals: Mar-Apr’2010

• Finalise matching cells*

• Surface fields of matching cells*

• 7 single cell simulations for the 192 cell structure with DDS2HPT manifold dimensions

• IPAC

• X-band collaboration meeting

Conference + workshop : May’2010

* priority

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 7/6

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 18.03.10 8/6

Back up slides

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 9/6

DDS1 : Plain curve ; DDS2 : Curve with dots

Dipole mode : circuit parameters

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 10/6

DDS2_HPT : Surface fields

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 11/6

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

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 12/6

Matching cell design

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

L

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 13/6

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

a: 4-6 mm

N=3a: 4-6 mm

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 14/6

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

a: 4.4-4.6 mm

N=3a: 4.4-4.6 mm

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 15/6

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 18.03.10 16/6

)/(E

ESImagSReS 2

2

cell singleacc

ULureacc_struct

61

c mW

Where S= Poynting vector

@ 95 MV/m

Cell # 1

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 17/6

@ 138 MV/m

Cell # 24

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 18/6

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

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 19/6

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 20/6

Cell # 1

Cell # 24

Vasim Khan MEW group meeting, Cockcroft Institute 18.03.10 21/6CLIC_DDS_HPT