GDE Workshop Summary and Plans at LCWS11: Review, Develop, Discuss
Summary of the GDE Workshop at LCWS11 led by Kaoru Yokoya in Granada, Spain, outlining key goals, R&D progress, cavity gradient and yield updates, yield plots by year, and studies on FLASH and S1Global projects. Discussions include TDR review, agenda development, and future paths
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GDE Workshop Summary and Plans Kaoru Yokoya, KEK 2011.9.30 LCWS11, Granada, Spain 2011/9/30 LCWS11 K.Yokoya 1
Goals of the Workshop Three important steps are to be taken at LCWS11: 1) Reviewing the TDR outline and finalizing writing assignments. 2) Developing the agenda for the upcoming Baseline Technical Reviews - Central Region, Main Linac and CFS. 3) Discussing the path forward, including work after publication of the TDR. From opening talk by B.Barrish 2011/9/30 LCWS11 K.Yokoya 2
R&D Progress and Plan Cavity gradient and yield SCRF Systems Tests FLASH S1Global STF2 NML Beam test facility CESR-TA ATF2 Other R&D studies Positron MDI (detector hall) 2011/9/30 LCWS11 K.Yokoya 3
Cavity Gradient and Yield: Updates Previous update was ALCPG11 (Eugene) March 2011 41 cavities for 1stpass, 31 cavities for 2ndpass Additional plots made with ALCPG11 data at Akira s request Yield time dependence by workshop and by year(s) Updates which affect standard yield plots KEK (Kirk) MHI016: test#1 Eacc=20.8 MV/m added MHI017: test#1 Eacc=38.4 MV/m added Note: MHI015 2ndVT after localized grinding, not (yet) accepted process, not included JLab (Camille) TB9RI028 2ndpass: test#1 22.0 MV/m -> test#2 Eacc=38.8 MV/m (mistake corrected) DESY (Sebastian) AC146: test#1 Eacc=23.63 -> 26.13 MV/m (mistake corrected) AC146: test#2 Eacc=40.2 MV/m added Z162: test#1 Eacc=31.0 MV/m added 44 cavities for 1stpass, 33 cavities for 2ndpass C.Ginzburg Sep.29.2011 2011/9/30 LCWS11 K.Yokoya 4
Now, Yield plot by Year available 2011/9/30 LCWS11 K.Yokoya 5 C.Ginzburg Sep.29.2011
FLASH 9mA study Since 2008 Feb.2011 Operation with gradient spread Achieved flat cavity gradient to 2.5% V/ V (400 s, 4.5mA) Energy stability <0.15% p-p (0.4ms, 4.5mA) Remaining issues Operation near cavity gradient limit (2012) Bootstrap issue (stability et.al. at full current. full gradient) +-25% spread in ACC6+7 2011/9/30 LCWS11 K.Yokoya 6
S1Global 8 cavities in 2 cryostat from over world tested at KEK Goal 31.5MV/m, stability V/V<0.07%, <0.24deg) Plug-compatibility Various tests (heat load, LFD, etc) Achieved gradient (VT: 30MV/m) 27MV/m (1cav), 26MV/m (7cav) Successfully finished before the 3.11 earthquake Writing Summary Report in progress Meeting after TTC at IHEP (Dec.8-9) 2011/9/30 LCWS11 K.Yokoya 7
NML Module 1 at FNAL TTF Type III+ 8-cavity (DESY kit , assembly at FNAL) S1-Local Test since Jan.2010 Average 23.7MV/m (82.7% of Chechia test) LFD compensation test LLRF From E.Harms 2011/9/30 LCWS11 K.Yokoya 8
HLRF R&D KCS Waveguide test on-going at SLAC DRFS First test at S1-Global Next test at Quantum- Beam Project 2011/9/30 LCWS11 K.Yokoya 9
ATF/ATF2 Quick recovery from 3.11 Restored falling racks Concrete shield re-positioning Test beam to the and of ATF2 on Jun.3 Alignment measured Racetrack became fat by ~1.5mm DR realignment done Vertical emittance ~30pm People from over seas coming back 17 people from May to August Still to be done Alignment of ATF2 in Oct. Restore the DR emittance 10pm by Oct. Recover ATF2 spot 300nm by Nov. Special 1 day session for ATF/ 2011/9/30 LCWS11 K.Yokoya 10
Recovery History for Test Beam Mar 11 14 Apr 4 May 2 Jun 6 Jul 4 21 28 11 18 25 9 16 23 30 13 20 27 Blackout power Radiation Safety Summer Shutdown Power line recovery ATF Shield ATF2 Shield Test Beam KEK Requested Standby at Home Power Distri- bution Cooling Water Vacuum RF Rough Alignment (LINAC) (BT) (DR) KEK MW 1.7 2 / 5 MW (day/night) 24 MW 20 N.Terunuma
2012 Schedule (draft for discussion) 2012 Jan. 2 Feb 6 Mar .5 Apr 2 May 7 Jun 4 9 16 23 30 13 20 27 12 19 26 9 16 23 30 14 21 28 11 18 25 GDE meeting? Summer Shutdown New IP-BPM installation at IP JPS meeting Low emittance, Compton and Others Goal-2? and others Goal-1? and others N.Terunuma
Positron In-vacuum rotating target test going to start at LLNL Use Rigaku ferrofluidic vacuum seal Initial test of Rigaku ferrofluidic vacuum seal done Waiting for Daresbury wheel to arrive (~October) Flux Concentrator development Being designed at LLNL Prototype plan Room temperature test at low rep rate Full field,1 ms flat top test at LN temperature at low rep rate Short-pitch undulator Design of spin rotator/flipper Possible depolarization 2011/9/30 LCWS11 K.Yokoya 13
Design Issues and TDR 2011/9/30 LCWS11 K.Yokoya 14
Baseline Design Progress since SB2009 resulted in TLCC by Eugene workshop A) Gradient : average 31.5 MV/m +-20% B) Single tunnel with HLRF options (DRFS, KCS) C) Reduced power and half-size DR with upgrade path to full power D) Relocation of undulator for positron production, 10Hz operation at ECM<250GeV 2011/9/30 LCWS11 K.Yokoya 15
Baseline Technical Review Mission Decide next-level parameters of baseline Review RDR paramaters Define treaty points and layout Prepare for documentation. EDMS/vidualization CFS specifications Cost estimation methodology Writing assignments Schedule DR Central region (source, BDS, RTML) ML CFS Jul.7-8 Oct.24-27 Frascati DESY Jan.19-20.2012 Apr?.2012 KEK CERN DESY Meeting schedule (from N.Walker, AD&I meeting, Sep.14) Mon.? 24.10 Intro? &? BDS/MDI BDS/MDI BDS/MDI BDS/MDI Tue.? 25.10 e+? source e+? source e+? source e+? source Wed.? 26.10 e-? source e-? source RTML? (1? vs? 2-stage? BC) RTML? (1? vs? 2-stage? BC) Thu.? 27.10 RTML? (general) Central? Region? Integration TDR? planning Close-out AM PM 2011/9/30 LCWS11 K.Yokoya 16
DTC02 Layout (D.L.Rubin) DT Lattice Circumference = 3238.681 m Harmonic number =7022 710-m straights 6 phase trombone cells Sixty 2.1-m long wigglers: 30-cm period, 14 poles Bmax= 2.16T Space for 16 RF cavities The cryostats for upper and lower positron rings are interleaved. Further improvement being studies Lowering momentum compaction factor Use of 2ndharmonic cavity Crittenden From summary by M.Palmer
DR Parameters decided at BTR-DR (Jul.7-8 @ Frascati) Lattice fixed Treaty points defined Acceptance for injected positron Max energy error +- 0.5% Max bunch length +- 34mm Max transverse amplitude Ax+Ay < 0.09 m.rad Extracted beam specification Horizontal emittance (norm.) < 800pm (<8mm.mrad) Vertical emittance (norm.) Rms energy spread @5GeV Harmonic number h=7022 (circumference 3239m) Number of bunches Low Power 1312 (5Hz, 10Hz) Full power 2625 at 5Hz Beam pulse in Main Linac Low Power DRFS 2pm 7.5MeV (0.15%) (20nm.rad) interval current Pulse length 732 ns 4.4 mA 0.961 ms KCS 554 ns 5.8 mA 0.727 ms Full Power 366 ns 8.8 mA 0.961 ms 2011/9/30 LCWS11 K.Yokoya 18
Central Region Geometry/Layout From this sort of sketch to Draft drawing by CFS group, Aug.16 Treaty points defined Beamline naming convention defined 2011/9/30 LCWS11 K.Yokoya 19
Naming looks like 2011/9/30 LCWS11 K.Yokoya 20
DR exit & global coordinate system 1stH-arc ~26.309 2ndH-arc ~39.658 Straight FODO Extraction Extract + or 7mrad (?) RTML coord. & Twiss parameters at start pRTML (e+) (lower/upper) Parameter eRTML (e-) x [m] y [m] z [m] theta [rad] alpha_x beta_x [m] alpha_y beta_y [m] 85.280 2.120 -77.740 3.382 0.980 20.5 -0.740 7.5 85.280 0.820/3.420 77.740 -0.240 0.980 20.5 -0.740 7.5 all MAD-style elevation and roll angles, and dispersions = 0: yz=0; xy=0, Dx=0; Dpx=0; Dy=0; Dpy=0 N.Solyak 2011/9/30 LCWS11 K.Yokoya 21
Site-Dependent Study going on Mountain area tunnel design in Japan Study for EIA (Environment Impact Accessment) at CERN 2011/9/30 LCWS11 K.Yokoya 22
IR Hall CFS Reduce size/weight L-shaped Design without shaft also being designed (mountain area) Platform design Reducing height Movement system feasibility Vibration study A-A 200+20 ton x2 25m 19m Beam line 20m 2011/9/30 LCWS11 K.Yokoya 23
1TeV Upgrade Extending the energy reach Scenario 2x250GeV Linac addition at upstream Move turn-around and bunch compressor Undulator at the same location Cost effective design (higher gradient) Strawman parameter set Assume operating gradient 45MV/m, Q0>2x1010 Max site power < 300MW 2011/9/30 LCWS11 K.Yokoya 24
Strawman IR Parameters For study purposes only both machine and detector Machine parameters will be reviewed this workshop Subject to change! Parameters for physics simulation for DBD must be decided quite soon. Straw-man TeV 300MW 5% BS 300MW 10% BS 1000 1000 Ecm GeV 2.0 29.2 0.25 30 0.25 554 2.8 18.7 0.1 1.4 5% 2.80E+34 62% 2.0 29.2 0.15 18 0.15 429 2.1 18.7 0.3 1.7 11% 4.80E+34 50% N PB sigz betax betay sigx e10 MW mm mm mm nm sigy Dy Upsilon Ngamma deltaB L L(1%) Traveling focus Ngamma deltaB(%) L L(1%) nm 1.4 5.3 1.8 9.8 4Hz, 2280 bunches, x=1e-5, y=3e-8 3.40E+34 61% 5.60E+34 49% From N.Walker 2011/9/30 LCWS11 K.Yokoya 25
TDR: Table of Contents (subject to change) Part II: The ILC Baseline Design Introduction and Overview General parameters and layout SCRF Main Linacs Polarised electron source Positron source Damping ring RTML BDS and MDI Conventional Facilities, Siting and Global Systems The TeV Upgrade Option Scope of post TDR engineering (technical risk assessment) Project Implementation Planning Cost and Schedule Conclusions Two volumes Part I: Technical Design Phase R&D Introduction SCRF technology Beam test facilities Accelerator Systems R&D Post TDR R&D Conclusions 2011/9/30 LCWS11 K.Yokoya 26
Project Implementation Planning View towards the future LC organization Being discussed in EC CPDG document to be consulted To be included in TDR Contents Executive Summary Governance Funding Models Project Management Host Responsibilities Siting Issues In-Kind Contribution Models Industrialisation and Mass Production of the SCRF Linac Components Project Schedule Future Technical Activities Possible inclusion being discussed Siting issues Pre-ILC organization 2011/9/30 LCWS11 K.Yokoya 27
Costing Must be Construction period 8 years Guidelines presented to individual groups SCRF Procurement model to be established Studies with industries Definition of ILCU Introduction of OECD-PPP (Purchase Power Parity) is being discussed instead of exchange rate More stable and closer to reality CFS For site-specific cost, average of 3 regions to be cited Reason should be described if large cost difference Spread sheet ready (ICET) Value Credible, accurate, comprehensive Well-documented (even if confidential) 2011/9/30 LCWS11 K.Yokoya 28
ILC-CLIC General Issues group is preparing 2ndInterim Report (2011) Energy decision point Physics considerations Industrial procurement for large accelerator systems One of the mandate of General Issues Group is Identifying points of comparison between the two approaches to the linear collider Plan for the final report (2012) Points of comparison between the two approaches Physics reach Accelerator technology Explore the elements of comparrison of the two approaches Comparative reliability Future technology development? Cost & power estimates Needs inputs from every groups Start to collect in LCWS11 GI would like to receive a list of those issues that carry the highest potential for design improvement or that are perceived as most critical in your work and hence should receive particular attention 2011/9/30 LCWS11 K.Yokoya 29
Critical issue list: positron example Risk assessments for the e+ system: Undulator (OK, more RD needed for different scenarios other than Baseline) Photon Collimators (good progress made, need a real design) Capturing magnets (design done, prototyping on the way) Target (Tested, other engineering issues, OK) Pre-accelerator (done) RH (under discussion). Sources TeV upgrade seems to be OK. From Wei Gai, summary slide 2011/9/30 LCWS11 K.Yokoya 30
Post 2012 Completion of TDR at end of 2012 GDE mission will be completed Some works (TDR review and final printing) still needed (~half year?) New organization expected to start in early 2013 Smooth transition required Being discussed in ICFA/ILCSC ( J.Bagger s talk) Will take some time to start to function Political issues (governance/siting) will become important What to do post 2012 for technology? Remaining R&D Facility operation DESY-FLASH, KEK-STF2, FNAL-NML ATF/ATF2 Engineering design Industrialization and cost reduction of SCRF components Development of technology for energy upgrade 2011/9/30 LCWS11 K.Yokoya 31
Summary R&D works near-final stage on-going, in particular SCRF module tests Preparation for TDR in progress BTR agenda worked out Cost methodology being established GDE will finish its mandate at TDR completion Will continue remaining work (review of TDR) for 0.5-1 year New transient organization being discussed Works continue beyond 2012 Systems tests Industrialization, cost reduction Waiting for LHC Must be ready for proposal for earliest case of project start Next GDE workshop in Korea (Daegu or Gyeonju) This is the Joint ACFA-GDE workshop Date still to be decided (Feb.-Apr.) 2011/9/30 LCWS11 K.Yokoya 32
