CLIC rf structure production
G. Riddone, BE-RF
2009.02.06
CLIC meeting, 20090206
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Content
• Structure production cycle and
responsibilities
• 30 GHz structures
• X-band structures (CERN, KEK, SLAC)
– From “mechanical design” to “ready for
installation”
• Master schedule
• Conclusions
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CERN structure production cycle and
responsibilities
RF design
BE/RF
Activities
coordinated in
mechanical design
and production
meetings
Mechanical design
BE/RF
Tendering
EN/MME
BE/RF
Decision point based on
experimental results
Fabrication
EN/MME
Preparation and
Assembly
TE/VAC, BE/RF
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QC
Dimensional control
SEM EN/MME
RF check BE/RF
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KEK/SLAC structure production cycle
and responsibilities
RF design
BE/RF
Mechanical design
KEK
Tendering
KEK
Activities
followed in
monthly
collaboration
meetings
Decision point based on
experimental results
Fabrication
KEK
Preparation and
Assembly
SLAC
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QC
KEK/SLAC
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Status - 30 GHz ac. structures
Ready for installation
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Disks at CERN
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Status – x-band ac. structures
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CLIC vg1/G structures
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C10-CD10 structures
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Mechanical design
RF INPUT
ST
Generated 3D Parts
RF CHECK
SmarTeam
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3D Part
Assembly Design
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A. Samoshkin
Mechanical design
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D.Gudkov
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Damped Disks
machining by turning and milling
• Disks: machining by diamond turning
• Adding damping features  Needs milling (no circular
symmetry) with smooth transition between milled and
turned surfaces.
• Assembly by vacuum brazing (CERN)
• Assembly by H2 brazing (KEK/SLAC)
Accelerating structure CLIC G (undamped)
Damped disks VG1
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Firms:
- VDL (fully qualified)
- Kugler and LT Ultra (still under qualification)
- KEK/SLAC firms
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Achieved accuracy (disk)
30 GHz [accuracy in um]
11.4 GHz [accuracy in um]
Speed bump (VDL)
Specified
TD18_disk (VDL)
Specified
Achieved
SA: iris shape accuracy
ID: inner diameter
Ra: roughness
Achieved
OD: outer diameter
Th: iris thickness
S. Atieh
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Achieved accuracy (T18#2_KEK)
T. Higo
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Dimensional control (TD18)
TD18 (VDL)
4 mm
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From VDL dimensional report
Assembly by brazing
Before brazing
Holes/grooves
for brazing
After brazing
After brazing ,
ready for RF check
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Assembly by brazing
SB, 813 ˚C, 20’
Tx18: 815 ˚C, 20‘
790 ˚C, 2 h
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Assembly by bonding and
alignment verification (SLAC)
- Bonding of the disks
- Brazing of the couplers
- Brazing of the tuning studs
04.12.2008
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Tuning by hammering
Test set-up for
tuning (SLAC)
Disks with
tuning studs
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T18_disk_CERN (1/3)
Following the bad test results of the T18_disk CERN a “Task Force” has
been set-up to understand the cause and to define the actions for the
future structures.
History reconstruction and comparison to other structures have been
made  structure from Kugler with several NCs, cleaning procedure
different from the old X-band structure, brazing design different from old
X-band structure
The structure was sent back to CERN last week.
RF check, cutting and inspection (agreed procedure) will be then
performed
Corrective actions have been defined in case of confirmation of brazing
problem
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T18_disk_CERN
(2/3) - History
Fabrication NC
(ID, OD)
Different than
old x-band
procedure
3 brazing cycles
(low pressure, disk flatness)
Mismatch output
matching cell
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T18_disk_CERN
3/3 - Comparison
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Updated at the monthly collaboration meetings
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MASTER SCHEDULE (1/2)
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MASTER SCHEDULE (2/2)
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Future accelerating structures
Name
[#]
Material
Prototype
Motivation
Design
Fabricated by
Re-build a good structure
C10_vg1.35
2
Cu OFE
Reference
structure
New
CD10_vg1.35_WDS (1.16)
2
Cu OFE
Brazing, tuning, leak
tightness tests 5 disks
Damping
New
CD10_vg1.35_Choke
2
Cu OFE
Brazing, tuning, leak
tightness tests 5 disks
New damping
New
CD10 _vg1.32_WDS
2
Cu OFE
Lower DT
New
C10_vg1.35_milled
2
Cu OFE
Milling vs turning
New
CD10_vg1.35_WDS
2
CuZr
brazing tests on simple
samples
Harder material
Existing
CD10_vg1.35_WDS
2
Glidcop
brazing tests on simple
samples
Harder material
Existing
CD10_vg1.35_WDS
2
Cu OFS
brazing tests on simple
samples
Harder material
Existing
T18_disk (SLAC/KEK) design
Cu OFE
TD25_vg1.8_cc
2
Cu OFE
(KEK))
Alternative
solution
KEK
CLIC G damping material
2
Cu OFE
Final design
@ 12 GHz
New
500 GeV – 502 WDS
2
Cu OFE
Prototype
New
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PSI
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Conclusions
• Fabrication: at present VDL is the best firm, it is the only
one which is fully reliable  8-9 weeks for the TD18 or
TD24  big effort to qualify new firms
• T18: waiting for cutting and inspection results
• T24: if the T18 problem comes from brazing, machining of
the disk can be done at CERN
• TD18: on hold until the problem on T18 is fully understood
(few iterations may be necessary)
• T24 - TD24 (both at 11.4 and 12 GHz) under fabrication
• T24 and TD24 also made at KEK/SLAC
• CD10 structures: tendering for prototype disks
• Decision to build at CERN T18_disk with same design, Cu
material and assembly methods as KEK/SLAC
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Extra slides
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SPEED BUMP
T18_disk_CERN
2 mm
30 mm gap
Bea
m
axis
80
mm
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TD18_disk_CERN
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T18_disk_KEK
A. Samoshkin
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