1. Summary of the test structure design
Grudiev
14/04/2010

2. 11.424 GHz, <100 MV/m>, 100 ns, reg. cells
CLIC_vg1: undamped damped
edms#
edms#
edms#
50%
41%
47%
CLIC_G: undamped damped
edms#
edms#
edms#
18% 8%
13%
A. Grudiev, 14/04/2010

3. 11.994 GHz, <100 MV/m>, 100 ns, reg. cells
CLIC_G: undamped damped
edms#
edms#
edms#
17% 8% 8%
new
A. Grudiev, 14/04/2010

4. Preliminary Design of the Damping Load
Will be used for CLIC module prototype and for a structure prototype for high power testing with damping load inside (TD24_vg1.8_diskR05_SiC)
SiC properties from M.Luong, 1999
thick line: awg = 11mm,
thin line: awg = 10.1 mm
Tip size 1x1 mm
Tip length 20 mm or 30 mm
Base size 5.6 x 5 or 5.5 mm
Base length 10 mm
Waveguide width
awd = 10.1 mm or 11 mm
A. Grudiev, 14/04/2010

5. Design of the damped compact coupler
Will be used for CLIC module prototype and for a structure prototype for high power testing with damped compact coupler (TD26_vg1.8_diskR05_CC)
A. Grudiev, 14/04/2010

6. Beyond CLIC_G
A structure with a degree of tapering lower than TD18_vg2.6_disk (41%) and TD24_vg1.8_diskR05 (8%) is an interesting option
For example, ~ %
It could also have bigger average aperture if CLIC main beam bunch charge can be increased accordingly.
A detailed optimization of the parameters and rf design will be done this year
A. Grudiev, 14/04/2010

7. The test matrix (all structures in disks)
R. Zennaro 2008
In red: 11.4 GHz new structures (C10)
In blue: 30 GHz new structures (scaled values for a and d) (C30)
d [mm]
a [mm]
2.79
2.13
2.00
1.66
1.37
1.25
2.53
Vg: 0.7%
CLIC _vg1
output 1.0%
2.85
T53 output
1.0%
3.0
CERN-X
1.1%
Vg: 1.35%
3.87
3.89*
Vg: 2.25%
(*)
30 GHz 2π/3 ≈2.6%
T53 input
Vg: 3.3%
4.38
30 GHz 2π/3 4.7%
5.00
30 GHz
π/2 7.4%
2π/3 8.2%
Direct comparison of variation of a and P/c
Direct comparison of variation of d
Damped version?
Direct comparison of variation of P/c
Test for a relatively large group velocity
KEK 005/13/2008
(*) not very different from input vg1 (d=2.79; a=4.06)

8. C10 family Aperture scan (un-damped cells) C10_vg1.35 C10_vg0.7
Different damping geometry (damped cells with iris geometry from C10_vg1.35)
CD10_WDS
different materials are on hold
CD10_Choke (edms# )
different choke gap will be investigated
C10 family is still a valid approach because it is simpler and cheaper than a full scale tapered structure prototype.
The main problem is lower priority so it goes very slow, much slower than tapered structures. (C10-paradox !)
A. Grudiev, 14/04/2010

9. Single-feed mode launcher Design for C10 structures
E-field
H-field
-40dB BW
90 MHz
A. Grudiev, 14/04/2010

10. Quadrants/halves family
Here T18_vg2.6_quad design is used. It has no slots.
QUADs with SLOTS
T18_vg2.6_Qslot design is used. It is the T18_vg2.6_quad but 4 slots of 0.2 mm rounded with 0.2mm radius are introduced. Corresponding frequency up-shift is ~1 MHz, well within tuning range.
A. Grudiev, 14/04/2010