cavity gradient r&d...- five 9-cell cavities: built by accel, and processed/tested at jlab. -...
TRANSCRIPT
![Page 1: Cavity Gradient R&D...- Five 9-cell cavities: built by ACCEL, and processed/tested at Jlab. - All of them processed with one bulk EP followed by one light EP and by ultrasonic pure-water](https://reader033.vdocument.in/reader033/viewer/2022041822/5e5eb3221a5d880496679235/html5/thumbnails/1.jpg)
19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 1
Cavity Gradient R&D
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 2
Contents• R&D Current Status
– What has been obtained– What has been standard
• R&D Plan in TDP– R&D subjects and what will be expected– Time-line– Resource– Global cooperation
• Reference Information (to be attached)• NOT:
– How to establish the optimum field gradient for ILC• Decision process• Time scale
– Next talk by A. Yamamoto
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 3
R&D Current Status: • Americas
– Successful preparations at JLab• Most recent production
– Startup of the facility at FNAL– Second sound– T-map at LANL– New vendor Qualification
• Asia– STF
• Pulsed tests• Vertical Tests online• EP online
– Vendor qualification– Optical inspection system development
• Guided repair as an option to recover faulty cavities• Europe
– Preparation for mass production– Development optical inspection– HiGrade
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 4
America R&D: Nine-cells new series
- Five 9-cell cavities: built by ACCEL, and processed/tested at Jlab.- All of them processed with one bulk EP followed by one light EP and by ultrasonic pure-water cleaning with detergent (2%).
R. Geng - JLab
Preliminary
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Date Event 5
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9-cell cavity
max
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]Americas 9-cell Cavity Update
C. Ginsburg
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 6R. Geng - JLab
Preliminary
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Date Event 7
Quench Location with Fast Thermometry
Example of cavity which quenched at 16 MV/m without field emissionTemp rise ~0.1 K over ~2 sec in sensors #3 & #4 before quench seen on all sensors
Cernox RTD sensors (precise calibration, expensive) with fast readout (10 kHz)Flexible placement of sensors, attached to cavity surface with grease and band; slow installationSuitable for any cavity shape and highly portable
AES001 cell 3 #4 #3
FNAL C. Ginsburg, G. Wu, J. Ozelis
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 8
America R&D: FNAL Infrastructure
G. Wu, J. Ozelis FNAL
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 9
Niowave Single-Cell BCP Cavity Performance
Niowave Cavity
BCP (1:1:2) Etch Q0 (1.94 K) Peak Eacc
Q at Peak Eacc
Field Limit
NR1-1 85 μm 8.2 e 9 27.9 MV/m 1.2 e 9 RF Power
NR1-2 113 μm 1.2 e 10 29.2 MV/m 1.5 e 9 Marred Surface
NR1-3 60 μm 1.3 e 10 23.8 MV/m 3.8 e 9 Marred Surface
NR1-4 254 μm 1.5 e 10 27.4 MV/m 1.3 e 9 RF Power
NR1-5 184 μm 1.4 e 10 24.7 MV/m 3.6 e 9 Equator Weld Defect
NR1-6 205 μm 1.5 e 10 26.8 MV/m 3.8 e 9 Equator Weld Defect
Z. Conway - Cornell
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 10
Niowave Single-Cell BCP Cavity Performance
Z. Conway - Cornell
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 11
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 12
America R&D
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 13Z. Conway - Cornell
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 14
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 15
Niowave Single Cell NR-5
Z. Conway - Cornell
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 16L. Cooley - FNAL
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 17Z. Conway - Cornell
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 18
Asia R&D• First pulsed measurements at high gradients
– STF operation– Demonstrated upto 32 MV/m with standard
puls length• Kyoto Camera Upgrade
– Improve resolution• Manufacturer Training
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Date Event 19
Comparison of achieved Eacc,maxbetween Vertical Tests and Cryomodule Tests
November, 2008
Ave. Eacc,max (V.T)= 22.7 MV/m
Ave. Eacc,max (Cryo.)= 23.7 MV/m
Operational Gradientat 31.5 MV/m for ILC
No degradation was observedin the cryomodule tests.
RF Feedback / ON
S. Noguchi, E. Kako, H. Hayano et al.
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 20
Introduction of camera‐cylinder rotation mechanismfor cavity inspection with EP‐VT support jigs, and for jacketed cavity.
motor
rotary encoder
rotation limiter
bearing
H. Hayano, Y. Iwashita, K. Watanabe, Y. Kikuchi
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 21
(1)CCD camera upgradefrom 5µm CCD pixel to 2.2µm CCD pixel camera.
(2) Lens upgrademore magnification with more larger aperture.
(3) illumination upgradeEL panel has limited life with more high voltage (for more brightness).‐> LED + light guide with scattered surface (twice more light).
~7µm/pixel targeting 3.5 µm/pixel
H. Hayano, Y. Iwashita, K. Watanabe, Y. Kikuchi
Kyoto Camera Upgrade
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 22
(1)control of cavity positionbeing done by VB application.
(2) Image capture and automated file‐savealready done by VB application. (speed is enough fast, but must wait for vibration damping)(automated focus is the next concern)
(3) defect pattern matchingthe software already fabricated in 2007 was tested using recent high quality pictures.‐> no good results, so far. (match to every bright traces, not suspected defects only)
H. Hayano, Y. Iwashita, K. Watanabe, Y. Kikuchi
Kyoto Camera Upgrade: Image Capture Automation
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090225 ILC-GDE SCRF 23
Grinding Effort at KEK Grinder Head with Diamond compound seat
before after
Grinding machine was delivered in last week.
Diamond compound seat
#400 (size = 40 ~ 60 um)
as for 1st test
EBW bumps
sample plate (Nb)090225 23ILC-GDE SCRF
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 24
EU Status: Cavity Summary– Processes streamlined for mass production
• processes yield similar results as before• tank welding at an early state poses no problem
– Electropolishing is still superior• Data is problematic as it mixes different vendors
– Scatter is large• Can be traced to mechanical fabrication• Defects have been identified
– Need to improve QC at companies
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 25
EU Status
D. Reschke, to be published SRF 2009
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 26
Alternative Developments for ILC• Cost reduction is a strong driving force for ILC
– ~16000 cavities• New processes
– Vertical EP• New Material
– Large-grain niobium Material– Less fabrication steps than standard material
• New Shapes– ‘Low-loss‘ and ‘Re-entrant‘– Could reduce power dissipation at cryogenic
temperatures
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Date Event Global Design Effort 27Z. Conway - Cornell
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Date Event Global Design Effort 28
Large Grain Material (JLab)
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Date Event Global Design Effort 29
XFEL: Large Grain Multi-cell with EP
Large-grain niobium material with etch (BCP) and electropolishing (EP)
Behaviour similar to DESY observations on single-cells
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Date Event Global Design Effort 30
Alternative Cavity Shapes
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Date Event Global Design Effort 31
K. Saito et al.
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Date Event Global Design Effort 32
60mm-Aperture Re-Entrant CavityBest Eacc = 59 MV/m
Cornell-KEK Collaboration H. Padamsee et al. WEPMS009
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 33
Next steps• EU
– Preparation of the call for tender for XFEL cavities• Focus at DESY will be
– resolution of mass production problems– improvements to QC process
– HiGrade• Serves as a tool to implement the ILC process
– Series of 8 Large-Grain Cavities waiting for test• US
– Project X– Vendor development– Coupon studies
• KEK – S1-Global– Inspection methods– Local repair
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 34
America R&D
R. Geng - JLab
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 35
Strategy to Improve Performance• The lower gradient part
– Vendor qualification– Improvement of fabrication
and weld quality– Typically larger defects,
‚easily‘ detectable• The higher gradient part
– More systematic studies needed
• Tools are available– Surface Mapping
• T-Map• Second Sound
– Optical inspection• Common data evaluation is on
the way• In addition:
– Study repair options• Local grinding• Tumbling
R. Geng - JLab
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 36
R&D Plan in TDP• R&D subjects and what will be expected
– Improve the yield of the preparation process• Vertical test yield not yet sufficient
– Subsets of certain vendors do pass• Module integration (cavity assembly) will be investigated
– Improve weld quality• PMs have visited the various cavity manufacturers• Training for manufacturers is important
– Alternatives not to be forgotten• Large-grain• Low-loss shape
• Time-line– Beginning 2010
• Revise choice of the gradient if necessary • Resources
– Ongoing cavity fabrication in the three regions• ~60 tests targeted at ILC in TDP1• parallel startup of XFEL with 800 cavities on order
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 37
Thanks!• Several people were very supportive in
providing data and slides
• C. Ginsburg, R. Geng, Z. Conway, L. Cooley, D. Reschke, W. Singer, J. Sekutowicz, H. Hayano, E. Kako, K. Saito
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19.4.2009 TILC09 AAP ReviewLutz Lilje
Global Design Effort 38
Backup Slides
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Date Event 39
Americas 9-cell Vertical Tests
ILC goal
Px goal
Of 14 cavities, 6 cavities meet ILC VT spec & 10 meet Project X VT specNB: These are the tests which individual Labs choose to publish…
C. Ginsburg
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Date Event 40
Best Result ; obtained Eacc,max in #2 Cavity
RF Feedback / OFF32.7 MV/m
RF Feedback / ON 32.0 MV/m
Pin
Pt ~ Eacc
φ t
Pin
Pt ~ Eaccφ t
no piezo driveno pre-detuning
Stable Pulsed Operation ; STF Phase-1.0
1.5 msec, 5 Hz operation November, 2008’
φ inφ in
no piezo drivepre-detuning ( Δ f = +300 Hz)
Flat-top 1.0 ms
S. Noguchi, E. Kako, H. Hayano et al.
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Date Event 41
Four-Cavity Operation with Vector-Sum ControlNovember, 2008
Flat-top 1.0 msFlat-top 1.0 ms
Accelerating Gradient (Eacc) Cavity Phase (φt )
10 o
1.5 msec, 5 Hz operation
Cavity 1
Cavity 3
Cavity 2
Cavity 4
Cavity 1
Cavity 2
Cavity 3Cavity 4
Cavity 1 ; Eacc = 17.6 MV/mCavity 2 ; Eacc = 18.0 MV/mCavity 3 ; Eacc = 17.9 MV/mCavity 4 ; Eacc = 15.2 MV/m
Total Acceleration Voltage70 MV with φt < +/- 5o
S. Noguchi, E. Kako, H. Hayano et al.