clic08 workshop structure production: cern activities and master schedule
DESCRIPTION
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. Content. Accelerating structures - PowerPoint PPT PresentationTRANSCRIPT
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
2
ACCELERATING STRUCTURES
CLIC08 – Structure production and MS, 15.10.2008 3
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 C10CLIC 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
CLIC08 – Structure production and MS, 15.10.2008 7
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 #
Phas
e ad
v. (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 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
CLIC08 – Structure production and MS, 15.10.2008 20
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
CLIC08 – Structure production and MS, 15.10.2008 24
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