s0 status high-gradient cavities
DESCRIPTION
04Sep2008 EC meeting@KEK. S0 Status High-Gradient cavities. Lutz Lilje DESY. supplement by H. Hayano. Where are we?. America and Asia New vendors and new preparation setups Europe Previous production cycle Current production cycle Preliminary data. Reference; - PowerPoint PPT PresentationTRANSCRIPT
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Global Design Effort 1
S0 Status High-Gradient cavities
Lutz Lilje
DESY
supplement by H. Hayano
04Sep2008 EC meeting@KEK
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S0 Status Lutz Lilje DESY
Global Design Effort 2
Where are we?
• America and Asia– New vendors and new preparation setups
• Europe– Previous production cycle– Current production cycle– Preliminary data
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Americas Summary (all tests)
0
5
10
15
20
25
30
35
40
45A
5
A6
A7
A8
A9
A11
A12
A15
AE
S1
AE
S2
AE
S3
AE
S4
ICH
IRO
5
9-cell cavity
max
gra
die
nt
[MV
/m]
0
5
10
15
20
25
30
35
40
45
1
JLabCornellFNALANL/JLabJLab/KEK
Reference;R. L. Geng et al., Proc. SRF2007, Beijing, WEP28 (2007).R. L. Geng et al., Proc. LINAC08, Victoria, Canada, in preparation.C. M. Ginsburg (FNAL), private communication.W. J. Ashmanskas and H. S. Padamsee, Proc. SRF2007, Beijing, WEP39 (2007).
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4
Americas Summary (best test)
0
5
10
15
20
25
30
35
40
45A
5
A6
A7
A8
A9
A11
A12
A15
AE
S1
AE
S2
AE
S3
AE
S4
ICH
IRO
5
9-cell cavity
max
gra
die
nt
[MV
/m]
0
5
10
15
20
25
30
35
40
45
1 2 3 4 5 6 7 8 9 10
JLabCornellFNALJLab/KEK
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KEK 9 cell cavity statusTESLA shape LL shape
BL#1 in module 20.8MV/m,Q=1.8x1010
MHI I9#1(LL#0) no coupler 29.3MV/m,Q=1.0x1010
Kuroki
BL#2 in module 29.4MV/m,Q=2.0x1010
MHI I9#2(LL#1) module tested 19.0MV/m,Q=0.4x1010
Kuroki
BL#3 in module 20.5MV/m,Q=1.5x1010
MHI I9#3(LL#2) 12.4MV/m,Q=1.2x1010
Kuroki
BL#4 in module 20.2MV/m,Q=2.0x1010
MHI I9#4(LL#3) for tuner test --- Kuroki
BL#5 under EP process
--- MHI I9#5 no coupler,KEK, JLab tested
22.0MV/m,Q=2.0x1010
(at KEK)
35.0MV/m,Q=0.8x1010
(at JLab)Kuroki
BL#6 under EP process
--- MHI I9#6(PAL) no coupler,now in PAL --- Korea
BL#7 under contract
--- I9#7new Ichiro
14.0MV/m,Q=0.7x1010
Kuroki
BL#8 under contract
--- I9#8new Ichiro
--- Kuroki
BL#9 under contract
--- I9#9new Ichiro
under plan ---
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S0 Status Lutz Lilje DESY
Global Design Effort 6
KEK Data: TESLA-Type
KEK TESLA-shape cavities
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LL #5 S0 Studies at JLabUltrasonic Cleaning with degreaser much effective
to reduce Field Emission
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S0 Status Lutz Lilje DESY
Global Design Effort 8
DESY 4th: Field Emission Analysis
0123456
no.
of
cavi
ties EP w/o ethanol: Eonset
EP w/o ethanol: Emax
0123456
no.
of
cavi
ties EP with ethanol: E_onset
EP with ethanol: Emax
0123456
<16 16-18 18-20 20-22 22-24 24-26 26-28 28-30 30-32 32-34 34-36 36-38 38-40 40-42Gradient [MV/m]
no.
of
cavi
ties BCP ("EP+"): E_onset
BCP ("EP+"): Emax
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S0 Status Lutz Lilje DESY
Global Design Effort 9
DESY 4th: Field Emission Analysis
0123456
no.
of
cavi
ties EP w/o ethanol: Eonset
EP w/o ethanol: Emax
0123456
no.
of
cavi
ties EP with ethanol: E_onset
EP with ethanol: Emax
0123456
<16 16-18 18-20 20-22 22-24 24-26 26-28 28-30 30-32 32-34 34-36 36-38 38-40 40-42Gradient [MV/m]
no.
of
cavi
ties BCP ("EP+"): E_onset
BCP ("EP+"): EmaxOptical Inspection done
Z110
Z111
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S0 Status Lutz Lilje DESY
Global Design Effort 10
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11
TESLA cavity Z110: #8 cell equator
Quench location
#8 equator
250 ~ 300 deg
1mm
#8 equator, t=288 ~ 299 deg
10mm
t=292 deg
t=297 deg
T-map data in test 2, 14.2 MV/m
group of beads(?) with 10mm wide were observed.Similar beads group were also observed in several places. see following slides.
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12
TESLA cavity Z111: #6 cell equator
T-map data in test 2, 16.0 MV/m
Quench location
#6 equator
175 ~ 225 deg
#6 equator, t=193 ~ 204 deg
1mm
1.5mm
t=198 deg
t=199 deg
group of beads(?) with 1.5mm wide were observed.
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13
0 360 deg180 90 270
#1
#2
#7
#6
#5
#4
#3
#9
#8
#1-#2i
#2-#3i
#3-#4i
#4-#5i
#5-#6i
#6-#7i
#7-#8i
#8-#9i
Group of spot
Scratch
Z110 summary
08/05/12
Iris
equator
T-map Heat spot
cell equator
Iris
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14
0 360 deg180 90 270
#1
#2
#7
#6
#5
#4
#3
#9
#8
#1-#2i
#2-#3i
#3-#4i
#4-#5i
#5-#6i
#6-#7i
#7-#8i
#8-#9i
Group of spot
Scratch
Z111 summary
08/05/15
Iris
equator
T-mapHeat spot
cell equator
Iris
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S0 Status Lutz Lilje DESY
Global Design Effort 15
DESY Current Production:Comparison of Final Treatment
0
2
4
10 15 20 25 30 35 40
Eacc[MV/m]
# o
f ca
viti
es
BCP
EP
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S0 Status Lutz Lilje DESY
Global Design Effort 16
DESY 4th: Field Emission Analysis
0123456
no.
of
cavi
ties EP w/o ethanol: Eonset
EP w/o ethanol: Emax
0123456
no.
of
cavi
ties EP with ethanol: E_onset
EP with ethanol: Emax
0123456
<16 16-18 18-20 20-22 22-24 24-26 26-28 28-30 30-32 32-34 34-36 36-38 38-40 40-42Gradient [MV/m]
no.
of
cavi
ties BCP ("EP+"): E_onset
BCP ("EP+"): Emax
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S0 Status Lutz Lilje DESY
Global Design Effort 17
0
2
4
10 15 20 25 30 35 40
Eacc[MV/m]
# of
cav
ities
BCP
EP
DESY Current Production:Comparison of Final Treatment
Optical Inspection next
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Camera Inspection Study of the STF TESLA-shape cavity #6
2008/3 : EBW parameter was decided by inspecting dumbbell EBW test samples.
2008/6 : STF TESLA-shape cavities #5 and #6 fabrication was completed.
The first inspection by using Kyoto camera (After fabrication)
2008/7 : Pre-EP (5 um) and EP-1 (20 um), Total removed about 25 um.
The second inspection by using Kyoto camera (After Pre-EP and EP-1)
2008/8 : 2nd EP-1 (100 um), Total removed about 25 um + 100 um
The third inspection by using Kyoto camera (After EP-1)
Five cat's eyes pits were found at equator,
and Three cat's eyes pits were found at iris at STF TESLA-shape #6 cavity.
*STF Baseline #5 cavity will be inspection from Sept. 15
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Measured line
1500 um
1mm
-100
-50
0
50
100
0 500 1000 1500
STF baseline #6 cavityAfter EP-1 (25 + 100 um removed)
#2 cell equator Z=285mm t=198deg
Height [um] (100)
He
igh
t [u
m]
Z-axis [um]
Cavity wall side
Cavity vac.side
-30
-20
-10
0
10
20
0 500 1000 1500
STF baseline #6 cavityAfter EP-1 (25 + 100 um removed)
#2 cell equator Z=285mm t=198deg
Height [um] (100)
He
igh
t [u
m]
Z-axis [um]
Cavity wall side
Cavity vac.side
STF Baseline #6 cavity : #2 cell equator, Z=286mm, t=198 deg
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EP-1 (25 + 100 um removed)
After Fabrication EP-1 (25 um removed)
Comparison with each treatment #2 cell equator, Z=286mm, t=198 deg
1 2
3
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1mm
Measured line
1500 um
STF Baseline #6 cavity : #6 cell equator, Z=746mm, t=283 deg
-30
-20
-10
0
10
20
0 500 1000 1500
STF Baseline #6 cavityAfter EP-1 (25um + 100um removed)
#6 equator Z=746mm, t=283 deg.
Height [um] (100)
He
igh
t [u
m]
Z-axis [um]
-100
-50
0
50
100
0 500 1000 1500
STF Baseline #6 cavityAfter EP-1 (25um + 100um removed)
#6 equator Z=746mm, t=283 deg.
Height [um] (100)
He
igh
t [u
m]
Z-axis [um]
Cavity wall side
Cavity vac.side
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EP-1 (25 + 100 um removed)
After Fabrication EP-1 (25 um removed)
Comparison with each treatment #6 cell equator, Z=746mm, t=283 deg
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S0 Status Lutz Lilje DESY
Global Design Effort 23
Where are we?
• Production issues– Low-gradient cavities show defects found by
temperature map and optical inspection– Training of manufacturers is mandatory
• Preparation issues– Have less impact currently
• Rinses developped within ILC R&D are successful– Ethanol (DESY), Ultrasound (JLab), Short EP (KEK)
• Clear path forward– Apply high resolution inspection
systematically to improve weld quality– Apply optimum surface preparation e.g.
ethanol rinse
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Inspection Camera Status
KEK: 2 camera fabricated proto-type: under upgrading production-type #1: 1 year loan to DESY ( now at DESY ) ( 1 camera for US was proposed to US-JPN budget supplement, however it was not approved. )
production company contact was published to key players.
JLab: LDM system ( Questar telescope + mirror system ) was developed.
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JLab LDM with T-map
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JLab LDM Analysis
5/1/08, Rongli Geng JLab/KEK/FNAL S0 meeting
ACCEL8 (32 MV/m) Equator
4th Cell from FPC
ACCEL8 (32MV/m) Equator
2nd Cell from FPC
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Guided Repair Development StatusKEK: Local mechanical grinding
Try to apply Ultrasonic tooling, micro-powder grinding, micro-powder buffing, to sample Nb plate. Insertion Mechanics is under design.
JLab: Surface re-melting by EBW from outside. Try to apply re-melting to sample Nb plate with intentional pits.
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Rinse Development StatusDESY: Ethanol Rinse
JLab: Degreaser with ultrasonic KEK: Ethanol Rinse, Degreaser, H2O2 rise system are under developing.
Sponge wipe is under evaluating by JLab collaboration. Mechanics is under design.
Sample#1 Sample#2 (sponge wipe applied)
Lots of Nb-O particles (white)
Significantly reduced Nb-O particles
preliminary sample test
wipe test for sample in single-cell
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Global Design Effort 294.4.2008 Lutz LiljeILC Project@DESY
Global Design Effort 29
ILC S0 Feedback LoopCavity Incoming QC
Countermeasure(Guided Repair)
Huge Irregularitieseg. Scratches
Feedback:Improve
Specification/QC
Standard Cavity Preparation Cycle
Identify Irregularitieseg. pits
Standard Vertical Test Cavity
Horizontal Tests or Module Assembly
Additonal Processing Cycle
Understand nature of high gradient limitation
e.g. does minor EP move quench location
Single Cells
WitnessSamples
Samples
> XX MV/m
< XX MV/m
Standard Vertical Test Cavity
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S0 Status H. Hayano
Global Design Effort 30
Summary of S0 status
1. Cavity tests with optical inspection are come to standard procedure in KEK, JLab and DESY.
2. QC of EBW is recognized as important and inevitable. ( KEK has already started to instruct company. )
3. Guided repair tools are under developing.
4. Rinse studies are under progressing.