preparation for scrf btr to be held at kek, january 19 -20, 2012 akira yamamoto, marc ross, and nick...
TRANSCRIPT
Preparation for SCRF BTRto be held at KEK, January 19 -20, 2012
Akira Yamamoto, Marc Ross, and Nick Walker (PMs)Jim Kerby, and Tetsuo Shidara (SCRF-APMs)
Updated, Jan. 16, 2012
120115 GDE-PMs 1Plan for SCRF-BTR
Design Update in SB2009
2120115 GDE-PMs
RDR SB2009Motivation: Cost containment• Single accelerator tunnel• Smaller damping ring• e+ target location at high-energy
end, • SCRF: Gradient variation of 31.5
MV/m +/- 20 %, • HLRF: KCS and DRFS with RDR-RF
unit as backup
Plan for SCRF-BTR
TDR Technical Volumes
120115 GDE-PMs
Reference Design Report
ILC Technical Progress Report (“interim report”)
TDR Part I:R&D
TDR Part II:BaselineReferenceReport
Technical Design Report
~250 pagesDeliverable 2
~300 pagesDeliverables 1,3 and 4
* end of 2012 – formal publication early 2013
2007 2011 2013*
AD&I
3Plan for SCRF-BTR
TDR Part I: R&D - Outline1. Introduction 5 pages
2. Superconducting RF Technology 75 pages
3. Beam Test Facilities 75 pages
4. Accelerator Systems R&D 50 pages
5. Post-TDR R&D 20 pages
6. Conclusions 10 pages
120115 GDE-PMs 4Plan for SCRF-BTR
TDR Part II: ILC Baseline Reference
1. Introduction and overview 5 pages
2. General parameters and layout 15 pages
3. SCRF Main Linacs 60 pages
4. Polarised electron source 15 pages
5. Positron source 20 pages
6. Damping Rings 30 pages
7. Ring to Main Linac (RTML) 20 pages
8. Beam Delivery System & MDI 30 pages
9. CFS and global systems 30 pages
10. .. see later120115 GDE-PMs
Detailed section outline available here
7Plan for SCRF-BTR
TDR Part II: ILC Baseline Reference
1. Introduction and overview 5 pages
2. General parameters and layout 15 pages
3. SCRF Main Linacs 60 pages
4. Polarised electron source 15 pages
5. Positron source 20 pages
6. Damping Rings 30 pages
7. Ring to Main Linac (RTML) 20 pages
8. Beam Delivery System & MDI 30 pages
9. CFS and global systems 30 pages
10. .. see later120115 GDE-PMs
Detailed section outline available here
3.1 Main linac layout and parameters (Adolphsen)3.2 Cavity performance and production specification (Yamamoto, Kerby)3.3 Cavity integration, coupler, tuners,… (Hayano)3.4 Cryomodule design including quad (Pierini)3.5 Cryogenics systems (Peterson)3.6 RF power and distribution systems (Fukuda, Nantista) 3.7 Low-level RF control (Carwardine, Michizono)
8Plan for SCRF-BTR
How to prepare for BTR and TDR?
• Technical discussion in TTC, Dec. 5 – 8, to evaluate technically satisfactory/acceptable design for projects.
• ILC Specific discussion in post-TTC, Dec. 8-9, to seek for cost-effective technical choice to prepare for BTR
• Consensus/Decision for TDR writing, BTR at KEK, Jan. 19 – 20, 2012
120115 GDE-PMs 9Plan for SCRF-BTR
TTC: WG-1 Discussion Summary
120115 GDE-PMs
Tuner: finding,- Blade and slide-Jack tuners satisfy technical requirements- Accessibility to be important
Input couplers: finding: - Tesla and KEK couplers satisfy technicalrequirements- Cu-plating to be improved- Warm-flange to be interface
Cryomodule assembly: finding,- Alignment with EXFEL adaptable, - Magnetic field inside Lhe vessel, -
10Plan for SCRF-BTR
Important Step for Technical Guidelines proposed by PMs
• The first step to evaluate designs to satisfy the ILC technical requirements with:– Keeping ‘plug-compatibility’ at interfaces and
defining the envelope• The second step to choose the best cost-
effective designs for: – the TDR baseline description and the cost-
estimate
120115 GDE-PMs 11Plan for SCRF-BTR
Technical Change Guideline Re-ProposedSee Red parts (Further details with EXCEL sheets by Marc Ross )
Tech. Area Main Subjects Description
ML Integration Parameters and beam dynamics Single tunnel-layoutCM and Q periodicity:ML tunnel length
Possible tilting of the tunnel
Low-Power design as TDR baseline (SB2009), and alignment toleranceCircular tunnel in flat-land, and Kamaboko tunnel in mountain CM and Q periodicity: >> Stay at 9+4Q4+9 Reserved tunnel-extension of 400 m w/o or w/ utility ? >> More precise discussions for purpose requiredNew request from CFS: < 0.5 % tunnel tilting
RF power HLRF Configuration
LLRF operational overhead
KCS in flat-land siteRDR-RF unit in mountain site (DRFS to be withdrawn) ≥ 12% at G=31.5 MV/m +/-20% and RF power in RDR-unit <33.3 MV/m>
Cryomodule Envelope/interfaceString Unit 5 K radiation shield
Piping interface with flange?, inter-connect condition, etc,Stay at 9 +4Q4+9 (no change to 8+4Q4+8)Simplification and accessibility for active components such as tuners
Cryogenics Unit capacity Stay at 5 units per linacLimit of tilting angle in ML tunnel
Cavity integration and Cavity/CM test
Envelope, baseline, compatibility Test conditions
Tuner type, coupler warm-flange, beam pipe flange, magnetic shield (inside/outside), LHe tank etc. Test plan and fraction of CM to be tested
Cavity performance YieldGradient spread Degradation in CM module
New recipe and cost-base scope: 1st pass: 60% and 2nd pass: 70% ?G = 31.5 +/- 20 % confirmed (Assume ~ 1/10 cavities to degrade dG = ~ 20 % or more, and ) >> Adopt a statistical approach to cavity degradation; <> and rms
Cost Cost containmentExchange rate and conversion
Technical design base on SB2009 (updated) compared with RDR cost PPP
120115 GDE-PMs12Plan for SCRF-BTR
High-Level RF SolutionsKlystron Cluster Scheme, KCS (SLAC)
Distributed RF Sources, DRFS (KEK)
2×35 10MW MB klystrons
GDE-PMs, 14th Nov. 2011 SCRF Industrialization 13
~4000×800kW klystrons
Tunneling Study for Mountain Regions in Japan
12/01/10, A. Yamamoto GDE-Efforts for ILC Cost 14
Courtesy: Enomoto/MiyaharaStudy supported by KEK-DG
Studies made for 8 cases
These are cost-and time-effective in Japan 120115 GDE-PMs Plan for SCRF-BTR 16
Studies made for 8 cases
DRFS RF unit:2 cavities operated by 800 kW Klystron
RDR RF unite : 3 Cryomodule (9+8+9 = 26 cavity), operated by using 10 MW Klystron 120115 GDE-PMs Plan for SCRF-BTR 17
Progress in Discussion and Consensusamong HLRF and CFS experts, as of Jan. 5, 2012
• ‘Kamaboko’ type tunnel for mountain region and RDR HLRF configuration may be fully adaptable,
• DRFS and RDR-backup may satisfy ILC requirements, • RDR-backup configuration to be more cost-effective solution,
• 10 MW klystron may handle 26 (9+4Q4+9) cavities with gradient spread of 31.5MV/m+/-20 % (25 – 38 MV/m) in case of RDR-RF or KCS-RF design, with minimum operational margin
– Klystron power consumption spread corresponding to: <29.7> - <33.3>– 20 % at <31.5>, and 12 % at <33.3 MV/m> assuming Gaussian distribution – Low-power baseline (for TDR) with 39 (1.5 x (9+4Q4+9) cavity string may absorb this problem, in TDR with
SB2009-updated design,
– (400 m tunnel backup needs to be well discussed again: what would be the purpose, and how it should be equipped or not)
• Requirements for CFS to stay < 31.5 MV/m> and 10 MW klystron for RDR-RF and KCS configuration
– Chilling water and power line unit can be extended to 2.3 km and everything may be well averaged. Then no extra requirements for CFS (except for the additional 400 m equipped or not) .
120115 GDE-PMs 18Plan for SCRF-BTR
SCRF Industrialization
A Proposal Revised
• Keep the concept of 9+8+9 cavity sting unit
9 4 + Q +4 9
8 8Q 8
8 4 + Q +4 8
GDE-PMs, 14th Nov. 2011 19
Access Routes with Mountain-site
GDE-PMs, 14th Nov. 2011 SCRF Industrialization 20
Layout of 2K CryoplantsML BDS IP
2K Cryoplants
RDR-based
How about this?
GDE-PMs, 14th Nov. 2011 SCRF Industrialization 21
Length of transfer line
DH
3236.0004429.9404650.0242764.8605087.1695087.169 2640.000 4275.616 4650.024 2764.860 5087.169 5087.169
AH4AH3AH2AH150N
AH5 AH6 AH7 AH8 AH9
15200.824 14450.500
25375.162 24624.838
29651.324
50000.000
AH050S
DH
3236.0005072.4125072.4124749.7354749.7352374.868 2640.000 4275.616 4650.024 5175.679 5175.679 2587.840
AH4AH3'AH2'AH1'50N
AH5 AH6 AH7 AH8' AH9'
15200.824 14450.500
25375.162 24624.838
29651.324
50000.000
AH0'50S
AH8 AH9AH0 AH1AH2 AH3
2764m 2325m 2325m 2215m 2215m 2138m 2138m 2325m 2325m 2764m
1700m 2536m 2536m 2536m 2536m 2138m 2138m 2325m 2325m 2764m
Two shield model Simplified shield model
ILC Cryomodule Plug-compatibility
Vacuum vessel = 965.2mm
120115 GDE-PMs
Some difference from EXFEL- Length- Cavity pitch- Unit configuration - Access flanges- Etc.
23Plan for SCRF-BTR
SCRF Industrialization 24
Quadrupole Cross-Section
LHe tank for current leads connections
Beam pipe Iron yoke
V. Kashikhin, FNAL Review, March 2, 2010GDE-PMs, 14th Nov. 2011
SCRF Industrialization
R&D/Demonstration Required• Rapid response to beam handling
– Study by K. Kubo and K. Yokoya
• R&D cooperation under discussion between Fermilab and KEK– Magnet by Fermilab and Conduction cooling by KEK
Peak field Response required
Quadrupole 30 T/m*m 0.01 T/m*m/sec (0.03% /sec)
Dipole 0.05 T*m 3E-4 Tm/sec (0.6 % /sec)
GDE-PMs, 14th Nov. 2011 25
Plug-compatible Conditions
Plug-compatible interface nearly established
Item Possibilities Plug-comp.
Cavity shape TeSLA/LL/RE
Length Fixed
Beam pipe flange Fixed
Suspension pitch Fixed
Tuner Blade/Jack TBD
Coupler flange (warm end)
Nearly fixed(250 mm dia.)
Coupler pitch fixed
He –in-line joint Nearly fixed as shown here,
120115 GDE-PMs 26Plan for SCRF-BTR
ILC 建設費見積もり (ILC RDR) FIGURE 6.2-1. Distribution of the ILC value estimate by area system and common infrastructure, in ILC Units. The estimate for the experimental detectors for particle physics is not included. (The Conventional Facilities estimates have been averaged over the three regional site estimates. )
27
Cavity & CM Ass.
-13%
-15%
RF Sys. -36%
-27%
Effort In progress
12/01/10, A. Yamamoto GDE-Efforts for ILC Cost
Updated Cavity Cost-study compared with RDR and E-FXEL (as of Oct., 2011)
ILC:RDR
EXFEL:Original 300
EXFEL:+ 80
ILC:E A J
Prep.+Prod. Yrs. 2+3 1+2.5 ? 2+6 2+6 2+6
Fraction 100% 2 x 50% ~ same 20% 20% 20%
# cavity 17,000 300 +80 3,200 3,200, 3,200
SC Material (supplied)
15.5 20+2 ~ same (~22x0.8*+2)) (~24*) (~2.4*)
Mech. Fabrication including EBW
Chemistry
Ti He-Vessel
Accept. Test (RT)
Factory investment
Fab. Cost/cavity(+ SC-mat.= Sum)
Unit
Cost Comparison in ILCU
28
Further mass production cost study with contracts in progress: - RI-DESY: 50, 100 % production cost including
facility cost- AES-FNAL: 20 % (& more as option) facility investment
cost- MHI-KEK: 20, 50, 100 % production cost w/
facility cost
To be completed by spring, 2012.
ILC コストを単純に EXFEL からエネルギーでスケーリングする事は無理がある。但し、同様の技術となる SCRF 空洞について比較検討は意味あり。
Reference for Cavity Specification • Technical guideline for ILC-GDE TDR and the cost estimate:
– referring Specifications for E-XFEL SCRF 1.3 GHz Cavity, issued by DESY• EXFEL/001 and associated documents :Rev.B, June 2009, by courtesy of W. Singer (DESY-XFEL)),• The reference specification is available with ILC-GDE PMs, under permission of W. Singer (DESY-XFEL) • URL: http://ilcagenda.linearcollider.org/event/ILC-SCRF-TR
GDE-PMs, 14th Nov. 2011 SCRF Industrialization 29
scrf-treq
Courtesy:W. Singer
EXFEL Cavity Deliverable (for a major reference for ILC Cavity)
120115 GDE-PMs
• From EXFEL specification: 02L BQM-Cavity in He Tank
30Plan for SCRF-BTR
TDR Cavity Baseline Configuration
120115 GDE-PMs 31Plan for SCRF-BTR
Cavity Fabrication Process
He Tank
GDE-PMs, 14th Nov. 2011 SCRF Industrialization 32
Material/Sub-component
Cavity Fabrication
Surface Process
LHe-Tank Assembly
Vertical Test =Cavity RF Test
CryomoduleAssembly and RF Test
Cavity Test Procedure consideration(He tank-on test)
Cavity Fabrication
Inspections/optical inspection
Bulk-EP (150µm)
800C heat treatment
optical inspection
cell RF tuning
surface repair 2
fine EP (20µm)
120C baking
He tank welding
pick-up antenna inst., HOM tuning
2K field test
OK
if defect found
surface repair 1
if defect found
4 Cavities Test in one cool-down
> 28MV/m < 28MV/m
2nd pass
remove pick-up antenna,
HOM antenna
with He Tank in 2nd pass
with He Tank in 2nd pass
skipin 2nd pass
to cryomodule
Cavity test facility
Coupler Fabrication
clean-up
pair assembly
pumping/120C baking
RF power process (RoomTemperature)
disassembly in clean room
assembly into cavitiesin clean room
RF power process(Room Temperature)
RF power process with cavity (2K)
20hrs for two
Coupler Procedure Cryomodule Procedurecryomodule assembly
cryomodule test facility
in tunnel
RF power process(Room Temperature)
RF power process with cavity (2K)
Accelerator Operation
reflection mode
through mode
reflection mode
through mode
Coupler test facility
2x peak RF power process Move to Tunnel and install into Accelerator
cavities
couplers
Initial 20% cold-testThe rest 10% sampling for cold-test
100% power test
How to organize SCRF BTR• Co-organized by ILC-GDE and KEK LC office
– Thanks for the cooperation– Open for ILC-GDE and KEK members (not for companies, this time)
– http://ilcagenda.linearcollider.org/conferenceOtherViews.py?view=standard&confId=5444
• Guidelines of design updates for TDR proposed by PMs, based on SB2009 design
• Responses, comments, and/or counter-proposals to be given by TA group leaders
• Discussions by everybody to reach consensus
• Decisions made by PMs for design updates in TDR• Further action to be made for TDR
120115 GDE-PMs Plan for SCRF-BTR 35
Agenda Proposed for SCRF BTR at KEK (1/19) Date Technical Area Subjects to be discussed Conveners /
- Presenters
9:00 - 19/AM-1
1. Introduction Welcome Address PM’s report
a) Japanese status and scope for ILC b) Summary of design update proposal
Ross- Suzuki - Yamamoto
10:15 - Break / photo
10:45 - 19/AM-2
2. ML Integration a) Beam dynamics: - Quadrupole/BPM periodicity, Quad. Location,- Alignment and beam tunability, - Bunch spacing limit b) Availability, reliability, and backup CM - 3 % longer (400 m) tunnel empty or equipped? c) ML CFS design and requests for ML and SCRF d) Comments from Cost Group
Adolphsen - Yokoya/Kubo
- List
- Kuchler - Dugan
12:15 - lunch
13;30 - 19/PM-1
3. HLRF/LLRF a) KCS/RDR-RF-unit HLRF system configuration including backup PS and utilities with the single tunnel design, and low-power and full-power
b) LLRF overheadw/gradient spread, and w/ (989 or 888) cavity-stringsc) Marx generatord) AC power and cooling w/ gradient spreads e) Tunable power distribution system f) Comments from Cost Group
Fukuda/Nantista
- Michizono- Adolpphsen-
- Dugan
15:15 - break
15:45 - 19/PM-2
4. Cryomodule and Cavity-string Assembly
a) Cryomodule envelope/interfaceb) CM-string configuration w/ 989 cavity-st. assembly c) Simplification of 5K radiation-shield, accessibility, flow reversal or not d) Split-yoke and conduction-cooled SC quadrupolese) Alignment scheme with EXFEL approach, f) Comments from Cost group
Pierini - TBD
- Dugan18:00 - Reception/Dinner
36120115 GDE-PMs Plan for SCRF-BTR
Subjects to be discussed and decided: ML Integration
• ML beam dynamics – SB2009 Low-power, 500 GeV Full-power, and 1 TeV upgrade
parameters• Lattice configuration with RDR RF unit periodicity, • Bunch spacing
• Availability and reserved tunnel-extension– 3 % longer (400 m) tunnel emply or equipped?– CM module backup, for degradation and failures, to required or not ?
• ML-CFS design status and requests for ML & SCRF– Tilting tunnel with < 0.5 % for water handling and saving access tunnel
length, – ML length to be fixed.
120115 GDE-PMs Plan for SCRF-BTR 37
Subjects to be discussed and decided:RF Power System
• RF system configurations– KCS: in flat-land site– RDR RF-unit: in mountain site
• cost-effective solutions to satisfy SB2009 low-power requirements (39 cavities operated by a 10 MW klystron)
– Marx generators – Tunable power distribution system– AC power and cooling requirements
120115 GDE-PMs Plan for SCRF-BTR 38
Subjects to be discussed and decided:Cryomodule and the Assembly
• Cryomodule envelope and interfaces• CM-string configuration
– Matched to TDR RF units, (i.e.; 9+4Q4+9 unit) • Simplification of 5 K radiation shield
– Cost effective design and accessibility for maintenance, (flow reversal pending for future option)
– Split-yoke and conduction-cooled SC Quad. – Alignment scheme with EXFEL approach
120115 GDE-PMs Plan for SCRF-BTR 39
Agenda Proposed for SCRF BTR at KEK (1/20)
Date Technical Area Subjects to be fixed Presenters/Conveners
9:00 - 20/AM-1
5. Cryogenics systems a) Location and number of cryogenics plantsb) Capacity optimization and heat balance with
crymodule heat-loadc) Tilting of cryomodule and the acceptable limitd) Comments from Cost Group
Peterson
- Dugan9:40 - break
10:00 - 20/AM-2
6-1. Cavity integration
6-2. Cavity and Cryomodule test
a) Cavity envelope/interfaceb) Tuner, coupler, beam-flange, magnetic shield, and LHe
tank, c) Cavity delivery condition with LHe-tankd) Power coupler conditioning strategy e) Cold test: what fraction is to be cold-tested? What is
to be tested? f) Comments from Cost Group
Hayano- TBD
- Dugan12:15 - Lunch
13:30 - 20/PM-1
7. Cavity gradient a) Cavity production and process recipeb) Define production yield including new parameters
such as radiationc) Gradient spread of 31.5 MV.m +/-20% d) Gradient degradation after assembly into the
cryomodule
Geng- Ginsburg- TBD
15:00 - break
15:30 - 20/PM-2
8. General Discussions and conclusion a) Current status for SCRF costing overview b) Summary of discussions and decisions - ML tunnel to be fixed including reserved extensionc) TDR SCRF outline and writing task d) Closing remark
Walker- Dugan- Yamamoto- Carwardine- Barish / Ross
17:30 SCRF BTR complete
120115 GDE-PMs 40Plan for SCRF-BTR
Subjects to be discussed and decided:Cryogenics
• Location, numbers of cryogenics plants,• Limit for tilting ML tunnel • Capacity optimization and heat balance
– Variation of the access tunnel position and the cryoplant capacity
120115 GDE-PMs Plan for SCRF-BTR 41
Subjects to be discussed and decidedCavity Integration
• Cavity envelope and interfaces• Design for the TDR cost-base:
– Baseline configuration: • Tesla-style cavity + Blade tuners
– Associated design evaluated:• Tuner, coupler, beam-flange, magnetic shield, LHe tank,
alignment-base, etc.
– Cavity delivery condition w/ LHe tank• Plan needed for the 2nd cycle process
120115 GDE-PMs Plan for SCRF-BTR 42
Subjects to be discussed and decided:Cavity and Cryomdule tests
• Cavity performance test in vertical position – 100 % w/ LHe tank, and up to the 2nd cycle
• Power coupler conditioning– 100 % before installation into the tunnel (or partly
after the installation?)• Cryomodule performance tests
– What and which fraction to be tested: ~ 30 %?
120115 GDE-PMs Plan for SCRF-BTR 43
Subjects to be discussed and decided:Cavity-Gradient Performance
• Cavity production and process recipe– Including plan for the 2nd cycle process and handlin
of LHe tank,• Define production yield
– including new parameters such as radiation, – Re-defining the yield for the production stage
• Gradient degradation after assembly into the cryomodule
• How to settle the gradient degradation? 120115 GDE-PMs Plan for SCRF-BTR 44
Subjects to be discussed and decided:General Summary
• Design for the TDR and the cost base– ML parameters and ML-CFS condition
• To fix tunnel length including reserved tunnel
– HLRF design and LLRF overhead– Cavity and Cryomodule design
• Plan for backup • Cost overview and scope for cost-containment• Plan for Technical Design Report• Further homework 120115 GDE-PMs Plan for SCRF-BTR 45
EDMS and Tech. Design Documentation
Important goal to consolidate all technical documentation in EDMS in a structured fashion
15.11.2011 Nick Walker - PAC, Prague
Tentative Schedule
15.11.2011
Korea GDE meeting24.04 – Parts I & II first drafts
US LC meeting (Arlington)24.10 – final Drafts
preparation
2011 2012
16 weeks
25 weeks
Executive Summary
Companion outreach document
Very aggressive schedule!In parallel:- cost estimation- TDD for EDMS
We like a challenge
Nick Walker - PAC, Prague
Backup
120115 GDE-PMs 48Plan for SCRF-BTR
SCRF-ML Technology RequiredRDR Parameters Value
C.M. Energy 500 GeV
Peak luminosity 2x1034 cm-2s-1
Beam Rep. rate 5 Hz
Pulse time duration 1 ms
Average current 9 mA (in pulse)
Av. field gradient 31.5 MV/m +/-20%
# 9-cell cavity ~ 18,000(14,560 + ) a x 1.11
# cryomodule (8+4Q4+8, in study)
~ 1,700 (1,680+ )b
# RF units ~ (560+ )g
49120115 GDE-PMs
RDR SB2009
Plan for SCRF-BTR
Cavity: Plug-compatible Interface
Component interfaces are
reduced to the minimum
necessary to allow for system
assembly120115 GDE-PMs 50Plan for SCRF-BTR
SCRF Industrialization 51
9-cell cavities: (17,325) production
Required Production in ILC
Cryomodule: (1,824) production
Pre-production 2 years +Full production 6 years
GDE-PMs, 14th Nov. 2011
Technical Change Guideline Re-ProposedSee Red parts (Further details with EXCEL sheets by Marc Ross )
Tech. Area Main Subjects Description
ML Integration Parameters and layout
Confirmed including alignment toleranceCM and Q periodicity: 8+4Q4+8 requiring additional ML length ( ~ 100 m) >> back to 9+4Q4+9How we shall keep additional backup 400 m w/o or w/ utility ? >> need more precise discussions for purpose New request from CFS: 0.5 ~ 1 % tunnel tilting
RF power Configuration DRFS/RDR in mountain site, >> back to RDR-RF unit in mountain site KCS/RDR in flat land
Cryomodule Envelope/interfaceUnit 5 K radiation shield
Piping interface with flange?, inter-connect condition, etc,8+4Q4+8 (or original 9 +4Q4+9)Simplification and accessibility for active components such as tuners
Cryogenics Unit capacity 5 4 units / linac or not? Stay at 5 units
Cavity integration Envelope Tuner type, coupler warm-flange, beam pipe flange, magnetic shield (inside/outside), LHe tank etc.
Cavity performance YieldGradient spread Degradation
For example: 1st pass: 60% and 2nd pass: 70% 31.5 +/- 20 % confirmed (Assume ~ 1/10 cavities to degrade dG = ~ 20 % or more, and ) >> Adopt a statistical approach to cavity degradation; <> and rms
Cost Cost containmentExchange rate and conversion
Technical design base on SB2009 (updated) compared with RDR cost PPP
120115 GDE-PMs52Plan for SCRF-BTR
ILC 建設費見積もり (ILC RDR (GDE による ))
Assumption in RDR: 1 ILC Unit = 1 US 2007$ (= 0.83 Euro = 117 Yen). Plan in TDR: 物価上昇: ~ 10 % (in case of the US) を想定 , 為替レート: Purchasing Power Parity を採用 (PPP: 購買力平価: OECD で採用) 53
-11 % Except for ML Componentsin SB2009
Efforts in Progress
12/01/10, A. Yamamoto GDE-Efforts for ILC Cost
RDR: Cavity Fabrication Model• Noell (Dornier-Astrium) report studied three
scenarios:1. 6 EBW machines with 1 chamber
– 3 ‘centres’ either distributed or at central facility
2. 7 EBW machines with 1 chamber– 4 centres, reduced shift operation at EBW 1-4– (variant on option 1)
3. 4 EBW with 3 chambers (loading, welding, cooling)– 1 centre (monolithic fabrication plant)
• Option 3 studied in detail
12/01/10, A. Yamamoto GDE-Efforts for ILC Cost 54
TDR に於けるコスト削減への努力
• ILC 性能要求を満たした場合に経済性を優先する– SB2009 での節約を基本、
– 空洞設計: Tesla Type を基本– HLRF 設計: RDR-RF unit を基本 (10 MW klystron)
– 工業化:量産における集約型製造と国際協力による製造、試験評価分担の最適条件を探る
12/01/10, A. Yamamoto GDE-Efforts for ILC Cost 55
Cryomodule Gradient Spread and Degradation Observed at DESY and KEK, as of Nov. 2010
• FLASH: – 3 PXFEL cryomodules
• ILC R&D:– S1-Global cryomodule– CM1 (S1-Local @ Fermilab)
• Current status: – 12/40 degraded with ~ 20 %
GDE-PMs, 14th Nov. 2011 SCRF Industrialization 56
1 - AC129 2 - AC123 3 - AC125 4 - Z143 5 - Z103 6 - Z93 7 - Z100 8 - AC1130
5
10
15
20
25
30
35
40
FLASH 30MV/m XFEL goal
13.07.2009
EA
CC [M
V/m
]
cavity
Cavity tests: Vertical ( CW ) Horizontal (10Hz) CMTB M8 (10Hz) CMTB (10Hz)
very
long
CW
cond
ition
ing
Cavities gradient limits
1 - Z141 2 - AC150 3 - Z133 4 - Z139 5 - AC122 6 - AC121 7 - AC128 8 - AC1150
5
10
15
20
25
30
35
Cavities gradient limits
XFEL goal
04.05.2010
EA
CC [M
V/m
]
cavity
Cavity tests: Vertical ( CW ) Horizontal(10Hz) CMTB (10Hz)
MP
1 - Z135 2 - AC124 3 - Z88 4 - Z134 5 - Z101 6 - AC127 7 - Z140 8 - Z970
5
10
15
20
25
30
35
Cavities gradient limits
XFEL goal
13.09.2010E
AC
C [
MV
/m]
cavity
Cavity tests: Vertical ( CW ) Horizontal(10Hz) CMTB (10Hz)
MP
FE
FE
PXFEL-1 PXFEL-2 PFEL-3
S1-Global
D. Kostin & E. Kako
Current statistics on cavity gradient degradation
Institute ProjectFraction of
Degradation DESY/FLASH PXFEL Prototype-1 2/8
PXFEL Prototype-2 2/8 PXFEL Prototype-3 1/8 Fermi Lab CM-1 4/8 KEK S1-Global 3/8 Total 12/40
GDE-PMs, 14th Nov. 2011 SCRF Industrialization 57
•Statistics, available now (see right table)
•Rate of degradation with > ~ 20 % ~12/40, which leads to ~30%. This is too high, and efforts of improving is required. How improved? Maybe up to ~10%. (acceptable?) •Sorting after vertical test is planed in DRFS. Furthermore 10% decrease of gradient is likely occurred and this reality should included at the construction plan. This effect also results in cost-up.
a. Numbers of cavities and rf units must be increased if total acceleration is short and it is not compensated by the overhead.
b. Since DRFS employs one rf unit feeds powers to 2 or 4 cavities without using circulator, and therefore cavity gradient sorting is inevitable, effect of unexpected cavity gradient degradation is larger than other scheme such as RDR and KCS.
Operational experiences
SCRF Industrialization 58
Estimate assuming 1/10 cavities degraded with 20 %
• Simple Calculation – 80 % pairs with full performance and 20 % pairs with 0.8 x full
performance • 0.8 x 1 + 0.2 x 0.8 = 0.96 without circulators, • 0.8 x 1 + 0.2 x {(1 +0.8)/2} = 0.98 with circulators, • Difference to be 0.02 = 2 % of {Cavity+HLRF} cost required to
add/compensate this degradation,
– Necessary study • Full circulator + distributors cost to be evaluated in comparison with the
additional cryomodule backup cost (additional extension of linac).
• Operational flexibility and better efficiency by circulators and power distributors to be evaluated
GDE-PMs, 14th Nov. 2011
Standard Procedure Establishedfor ILC-SCRF Cavity evaluation, in guidance of TTC
Standard Fabrication/Process
Fabrication Nb-sheet purchasing
Component Fabrication
Cavity assembly with EBW
Process EP-1 (~150um)
Ultrasonic degreasing with detergent, or ethanol rinse
High-pressure pure-water rinsing
Hydrogen degassing at > 600 C
Field flatness tuning
EP-2 (~20um)
Ultrasonic degreasing or ethanol (or EP 5 um with fresh acid)
High-pressure pure-water rinsing
Antenna Assembly
Baking at 120 C
Cold Test (vertical test)
Performance Test with temperature and mode measurement
59GDE-PMs, 14th Nov. 2011 SCRF Industrialization
Key ProcessFabrication• Material • EBW• Shape
Process • Electro-Polishing
• Ethanol Rinsing or • Ultra sonic. + Detergent
Rins.
• High Pr. Pure Water cleaning
allow twice
Cavity Deliverable assuming EXFEL cavity specification
GDE-PMs, 14th Nov. 2011 SCRF Industrialization 60
• From EXFEL specification: 02L BQM-Cavity in He Tank
Courtesy:W. Singer
EXFEL Cavity and Tuner
GDE-PMs, 14th Nov. 2011 SCRF Industrialization 61
Blade and Slide-Jack Tuners
GDE-PMs, 14th Nov. 2011 SCRF Industrialization 62