CLIC08 workshop

Structure production: CERN activities and Master Schedule

G. Riddone, W. Wuensch, R. Zennaro,

Contributions from C. Achard, S. Atieh, V. Dolgashev, D. Glaude, S. Heikkinen, A. Samoshkin, I. Syratchev+ KEK/SLAC collaborations

15.10.2008

CLIC08 – Structure production and MS, 15.10.2008

Content

• Accelerating structures• PETS• RF components

• Structure Master Schedule

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ACCELERATING STRUCTURES

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CLIC08 – Structure production and MS, 15.10.2008

Production cycle for acc. structures

4

Discussion…

If not possible

30 GHz – Speed bump, TM02, vg2.6

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35 m

m

4 tuning holes

25 m

m

TM02 before brazing

Speed bump

Speed bump cell

11.4 GHz - CLIC vg1, T18

QUADRANTS2 damped structures (1 from KEK and 1 from CERN)

DISKS5 undamped structures (4 from KEK/SLAC and 1 from CERN)3 damped structures (2 from KEK/SLAC and 1 from CERN)

Damped disks

Damped structure#1 ready for brazing (CERN)

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Undamped diskDamped quadrants

11.4 GHz - CLIC G and C10

CLIC G - T2411.4 GHz (tank and sealed configurations possible)- 2 undamped structures

from CERN- 1 damped structure from

CERN

12 GHz (tank) - 1 undamped structure- 1 damped structure

C10 (sealed configuration, tuning as SLAC design) - 10 undamped structures (2 from KEK/SLAC and 8 from SLAC)

- 4 damped structures ( 2 from KEK/SLAC and 2 from CERN)

CLIC G 12 GHz:CERN 3D models

300 mm

Disk undamped

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CLIC G under procurement

Mechanical design –Parameterization

CLIC08 – Structure production and MS, 15.10.2008

Alexandre.Samochkine @ cern.ch

RF INPUT 3D Part Generated 3D Parts

Assembly Design

S TSmarTeam

8

Mechanical design - disks

CLIC08 – Structure production and MS, 15.10.2008

Disk diameter: 80 mm4 tuning holes (push-pull possible)Assembly by brazing

9Internal cooling

Dimensional control

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TD18 (VDL)

Dimensional control

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T18 (Kugler)Requirements: +/- 5 micro

Achieved shape accuracy (quadrant)

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Achieved accuracy (disk)

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30 GHz [accuracy in mm]

Specified Achieved Specified Achieved

11.4 GHz [accuracy in mm]

SA: iris shape accuracyOD: outer diameterID: inner diameterTh: iris thicknessRa: roughness

Speed bump TD18_disk

RF measurements – TD18 quadrant

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-0.16

-0.12

-0.08

-0.04

0

0.04

0.08

0.12

-0.12 -0.08 -0.04 0 0.04 0.08 0.12

11.416 GHz

11.422 GHz

S11+S21 (240 deg phase advance)

11. 422 GHz

60

80

100

120

140

160

180

0 2 4 6 8 10 12 14 16 18 20

Cell #

Ph

as

e a

dv

. (d

eg

)

11.422 GHz: average phase advance/cell~124.3 deg/cell (average only for the regular cells)

SEM – disk #34 speed bump

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Recrystallization after thermal treatment (vacuum brazing cycle at 820 C)

Single Cell Accelerator StructuresSingle Cell Accelerator StructuresGoals • Study rf breakdown in practical accelerating structures:

dependence on circuit parameters, materials, cell shapes and surface processing techniques

Difficulties• Full scale structures are long, complex, and expensive Solution• Single cell Traveling wave (TW) and single cell

standing wave (SW) structures with properties close to that of full scale structures

• Reusable couplers

We want to predict breakdown behavior for practical structures V. Dolgashev

High Power Tests of Single Cell Standing Wave Structures

Tested• Low shunt impedance, a/lambda = 0.215, 1C-SW-A5.65-T4.6-Cu, 4 tested • Low shunt impedance, TiN coated, 1C-SW-A5.65-T4.6-Cu-TiN, 1 tested• Three high gradient cells, low shunt impedance, 3C-SW-A5.65-T4.6-Cu, 2 tested• High shunt impedance, elliptical iris, a/lambda = 0.143, 1C-SW-A3.75-T2.6-Cu,

1 tested• High shunt impedance, round iris, a/lambda = 0.143, 1C-SW-A3.75-T1.66-Cu,

1 tested• Choke in high gradient cell, 1C-SW-A5.65-T4.6-Choke-Cu, 2 tested• Low shunt impedance, made of CuZr, 1C-SW-A5.65-T4.6-CuZr, 1 tested

Now 13th test under way,

low shunt impedance cupper structure 1C-SW-A5.65-T4.6-Cu-Frascati-#2

V. Dolgashev

Reproducibility tests: High shunt impedance, elliptical iris, 1C-SW-A3.75-T2.6-Cu High shunt impedance, round iris, 1C-SW-A3.75-T1.66-Cu Low shunt impedance, made of CuZr, 1C-SW-A5.65-T4.6-CuZrThree high gradient cells, low shunt impedance, 3C-SW-A5.65-T4.6-Cu

Geometry tests:Photonic-Band-Gap in high gradient cell, 1C-SW-A5.65-T4.6-Cu-PBGHighest shunt impedance, a/lambda = 0.105, 1C-SW-A2.75-T2.0-CuThree cells, WR90 coupling to power source, 3C-SW-A5.65-T4.6-Cu-WR90High shunt impedance, choke with 4mm gap, 1C-SW-A3.75-T2.6-Choke-Cu

Materials: High shunt impedance, elliptical iris, 6N copper, 1C-SW-A3.75-T2.6-6N-CuHigh shunt impedance, made of CuZr, 1C-SW-A3.75-T2.6-CuZrLow shunt impedance, made of CuCr, 1C-SW-A5.65-T4.6-CuCrHigh shunt impedance, made of CuAg, 1C-SW-A3.75-T2.6-CuAg Low shunt impedance, made of CuAg, 1C-SW-A5.65-T4.6-CuAg

Traveling Wave structures, different materialsT53MC first cell: Copper, 1C-TW-A3.88-T1.66-CuStainless steel, 1C-TW-A3.88-T1.66-SSCopper-Molybdenum, 1C-TW-A3.88-T1.66-CuMo

Next experiments, as for 13 October 2008

V. Dolgashev

PETS

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PETS

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PETS at 11.4 GHz L = 300 mmTested at SLAC

PETS at 12 GHz L = 1000 mmTested in the TBTS

Mechanical design

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Dimensional control – 1-m long PETS

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During fabrication decision to enlarge the shape tolerance to +/- 25 mm

VDL

RF Components

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RF components

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Hybrids

GYCOM, Russia10 units, all available at CERN

RF and mechanical design, CERNUnder fabrication VDL, Holland10 units

Splitters

RF and mechanical design, CERNFabrication CINEL, Italy5 units , 2 available at CERN

Directional couplers

Choke mode flanges

RF and mechanical design, CERNFabrication Fluckiger, CH2 units shipped to SLAC

RF components

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12 GHzRF and mechanical design, CERNFabrication CINEL, Italy and VDL, Holland10 units: 6 available at CERN (AISI316LN)

11.4 GHzRF and mechanical design, CERNUnder fabrication CINEL4 units (SS430)

(stainless steel) RF load

Attenuator/phase shifter Scaled from 30 GHz CERN version. GYCOM Russia.5 units: 2 available at CERN

STRUCTURE MASTER SCHEDULE

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Structure status

X-band structures in the pipeline- CLIC vg1 - CLIC G (11.4 and 12 GHz)- C10- CLIC 500 GeV structure- C10 choke mode- CLIC structures with compact coupler

- PETS

30 GHz in the pipeline- Speed bump- TM02- Vg2.6

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X-band Structure Master Schedule 1/2

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NLCTA1

X-band Structure Master Schedule 2/2

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2008 2009NLCTA2

ASTA