23 th July 2010 CLIC meeting L. Rinolfi POSIPOL workshop 2010 L. Rinolfi A brief overview 23 th July 2010 CLIC meeting L. Rinolfi POSIPOL is a series of workshops dealing with the physics aspects, the design issues, and the open questions concerning polarized positron sources in the framework of the ILC and CLIC projects. POSIPOL 2010 was the fifth workshop following: POSIPOL 2006 at CERNChair: L. Rinolfi POSIPOL 2007 at LAL-OrsayChair: A. Variola POSIPOL 2008 at HiroshimaChair: M. Kuriki POSIPOL 2009 at IPNL-LyonChair: X. Artru POSIPOL 2010 at KEKChair: T. Omori Short history POSITONS POLARISS (in French) April 2006 23 th July 2010 CLIC meeting L. Rinolfi Participants POSIPOL participants (4 from CERN): M. Petrarca, L. Rinolfi, A. Vivoli, F. Zimmermann 19 Institutes (from America, Asia, Europe): ANL, BINP, BNL, CERN, DESY, Hiroshima University, IHEP, IPNL/IN2P3, INFN, ISIR, JAEA, KEK, LAL, LLNL, NSC/KIPT, RISE, Tokyo University, Tomsk, Waseda University. 23 th July 2010 CLIC meeting L. Rinolfi Scope of the workshop POSIPOL /May-2/June, KEK, Tsukuba T. Omori POSIPOL 2010 focuses, as in the previous years, on polarized positron sources for ILC and CLIC via Laser-Compton and via undulator-radiation, but also extends topics as target discussions particularly relevant for the conventional positron sources. For these later, various solid and liquid target materials and pseudo- conventional using channeling are topics of the workshop. POSIPOL 2010 deals also with various high intensity positron sources for other future collider projects, such as B-factories and LHeC. 23 th July 2010 CLIC meeting L. Rinolfi Japan Proton Accelerator Research Complex : J-PARC Mt. Fuji Narita Tokyo Kamioka Tokai Tsukuba e - /e + Collider B-Factory Photon-Factory ILC-Test Facility 23 th July 2010 CLIC meeting L. Rinolfi The JAHEP communitys master plan Highest priority is given to ILC Before ILC, promote flavor physics at KEKB and J-PARC Action before the ILC approval ILC R&D Completion/commissioning and continuous improvements of J-PARC Upgrade of KEKB/Belle Collaboration in LHC/ATLAS Koichiro Nishikawa News from IPNS director IPNS = Institute of Particle and Nuclear Study 23 th July 2010 CLIC meeting L. Rinolfi Physics: (1 talk) Status of e+ sources for colliders :(4 talks: ILC, CLIC, KEKB, BEPC) ILC-CLIC working group : (1 talk) Hybrid and channeling e+ sources (CLIC&ILC): (7 talks) Compton-based e+ sources for colliders (ILC&CLIC):(10 talks) Undulator-based e+ source for ILC:(4 talks) Compton-based X-ray and gamma-ray sources : (4 talks) (including applications to material physics) Liquid Pb and Pure Conventional e+ sources (ILC): (3 talks) What was discussed 23 th July 2010 CLIC meeting L. Rinolfi Why polarized e - and e + beams ? G. Moortgat-Pick 23 th July 2010 CLIC meeting L. Rinolfi LC Strategy G. Moortgat-Pick 23 th July 2010 CLIC meeting L. Rinolfi Arguments for polarized e + G. Moortgat-Pick 23 th July 2010 CLIC meeting L. Rinolfi Undulator Located at 150GeV point in electron linac Helical Pitch = 1.15cm, B=0.86T (K=0.92) Beam aperture 5.85mm Target Ti Alloy Wheel with radius 1m, thickness 1.4cm Rotating speed 100m/s (2000rpm) Capture Flux concentrator KAS (Keep Alive Source) Independent, conventional 10% intensity ILC - RDR design Kaoru Yokoya 23 th July 2010 CLIC meeting L. Rinolfi 1) Replace flux concentrator with QWT. Accordingly, undulator length 147m 231m to compensate for the less efficient capture.. This does not mean QWT+231m undulator is less risky than FC+147m undulator (Just because feasibility demonstration of FC is more costly). Higher target load due to longer undulator (x 1.6) 2) Move undulator to linac end One MPS Shorter positron transport No deceleration needed Everything dirty is concentrated near the center of the complex (BDS, DR, injectors) 3) Keep Alive Source (~10% intensity) replaced by Auxiliary Source (few % intensity) which shares the target, capture system, etc with the undulator source Kaoru Yokoya ILC - SB2009 Design Not yet the baseline 23 th July 2010 CLIC meeting L. Rinolfi e - / Target Pre-injector e + Linac 200 MeV Primary e - Beam Linac 5 GeV Injector Linac 2.66 GeV e + PDR 2 GHz 2.86 GeV e Target AMD unpolarized e + Bunching system Thermionic e - gun 4.6x10 9 e + / bunch Energy2.86GeV Positron yield (e+/e-)0.7 Charge7x10 9 e + /bunch Normalized rms emittances7300mm.mrad Energy spread (rms)113MeV Bunch length (rms)5.3mm Longitudinal rms emittance0.55m.MeV polarized e - CLIC - CDR Design - 3 TeV at PDR injection Primary e - beam energy 5 GeV Number e - / bunch10 Source of photonsW crystal (1.4 mm) Target for e + production W Amorphous target (10 mm) Target material (thickness) W (3 o ) Magnetic field capture system AMD (6 to 0.5 T) RF capture system10 MV/m at Source 23 th July 2010 CLIC meeting L. Rinolfi SuperKEKB e + source upgrade T. Kamitani 23 th July 2010 CLIC meeting L. Rinolfi T. Kamitani Status of SuperB factories 23 th July 2010 CLIC meeting L. Rinolfi Parameters Design Test results BEPC Energy GeV Current (mA) e+e ~5 e-e Emittance 1, mm-mrad e ~ e-e ~ Energy spread (1, %) e+e ~0.80 e-e ~0.80 Energy stability ( % ) Orbit stability (mm) ~ Repetition rate e + injection rate mA / min.) ~ 3 Status of BEPC II G. Pei Impressive progress from BEPC to BEPC II at Beijing 23 th July 2010 CLIC meeting L. Rinolfi Institutes: 5 from Asia, 6 from USA and 9 from Europe A review of the milestones will be done at the coming LC workshop in October 2010 at Geneva. R&D plan for e + studies ILC-CLIC e + generation working group Important reduction of resources have registered in several institutes. Therefore the ILC/CLIC work plan is reviewed according to the available resources from the different institutes around the world and the possible contributions are presented. 23 th July 2010 CLIC meeting L. Rinolfi S. Dabagov Channeling of charged particles 23 th July 2010 CLIC meeting L. Rinolfi Simulations for hybrid sources Crystal target Amorphous target e-e- Photons e+e+ O. Dadoun => will be included into G4 and X. Artru simulation 23 th July 2010 CLIC meeting L. Rinolfi Channeling simulations O. Dadoun Comparison of 2 codes 23 th July 2010 CLIC meeting L. Rinolfi CLIC: incident beam: 5 Gev; t 1 =1.4 mm; t 2 =10 mm ACCEPTED POSITRON YIELD * For an incident e- beam with = 1 mm => 1 e+/e- * For an incident e- beam with = 2.5 mm => = 0.9 e+/e- PEDD (Peak Energy Deposition Density) Assuming an incident e- pulse of e-, we have : CRYSTAL AMORPHOUS PEDD/e- PEDD/total PEDD/e- PEDD/total (GeV/cm3/e-) J/g (GeV/cm3/e-) J/g mm =2.5mm An entirely amorphous target, 9 mm thick, with the same incident e- beam would have provided the same accepted yield and a PEDD of 150 J/g ( =1mm) or 40J/g ( =2.5 mm). This shows the advantages of an hybrid scheme leading to a unique target with a PEDD < 35 J/g using an e- beam with = 2.5 mm. Hybrid source advantage R. Chehab 23 th July 2010 CLIC meeting L. Rinolfi S cm N. e + Yield e + /e - x mm mrad y mm mrad MeV E MeV z mm z cm MeV e + in PDR: 2720;Yield e + /e - =0.453 A. Vivoli CLIC Injector Linac 23 th July 2010 CLIC meeting L. Rinolfi Set up Site Looking up from Down stream KEKB Linac Tests for e + production from hybrid targets 23 th July 2010 CLIC meeting L. Rinolfi Zoom on e + crystal target 23 th July 2010 CLIC meeting L. Rinolfi hybrid on axis hybrid off axis conventional 8mm conventional 18mm 3.4 enhancement e+ yield (ADC counts ) black: 1mm W crystal + 8mm W amorphous Preliminary e + yield at KEKB Linac Experimental results from hybrid targets T. Takahashi 23 th July 2010 CLIC meeting L. Rinolfi Why Compton scheme ? 1)Method to obtain polarized e + (up to 90%) 2)Dedicated low energy e - beam (no inter-system dependence) 3)No issue for low energy scan operation 4)Technology feasibility can be evaluated before final construction BUT still some difficulties: 1)Laser ( high power and high quality) 2)Optical cavity 3)Electrons: Ring-based, ERL-based, Linac-based Compton scheme 4)Positron stacking required 23 th July 2010 CLIC meeting L. Rinolfi Optimal Compton ring E. Bulyak 23 th July 2010 CLIC meeting L. Rinolfi F. Zomer Optical cavity with 4 mirrors For polarized e + Compton source at ATF/KEK Cavity arrived yesterday at Narita 23 th July 2010 CLIC meeting L. Rinolfi I. Chaikovska Compton with multiple IP Characteristics for simulations of polarized gammas source 23 th July 2010 CLIC meeting L. Rinolfi I. Chaikovska Results for e + production 23 th July 2010 CLIC meeting L. Rinolfi SR 1 47 m e + PDR ERL 32 ns 50 Hz 400 m 25 Hz 0.5 ns 312 bunches / train 1 train / ring 312 bunches spaced by 0.5 ns => ns / turn Stack in the same bucket every 69th turn Number of stacking in the same bucket x 1864 = turns x ns = 20 ms SR 2 47 m new CLIC scheme Based on 2 CLIC stacking rings option F. Zimmermann e + stacking simulations CLIC stacking rings must have much shorter damping times ~50 s and higher RF voltage (35 MV) than SLC damping rings Large off-momentum dynamic aperture up to inj ~9% (!) is also required Preliminary simulations with semi-optimized parameters indicate >95% stacking efficiency 23 th July 2010 CLIC meeting L. Rinolfi Linac-based Compton scheme Conventional Non- Polarized Positrons: 3% over 1 s First tests of the laser cavity: Polarized -ray beam is generated in the Compton back scattering inside optical cavity of CO2 laser beam and 6 GeV e-beam produced by linac. Laser cavity needs R&D. 6GeV e - beam 60MeV beam 30MeV e + beam to e + conv. target ~2 m V. Yakimenko 23 th July 2010 CLIC meeting L. Rinolfi ILCCLICSuperB Required e + /sec Required beamSource beamRequired e + /bunch3nC/ nC/ pC/ e- beam energy6 4 GeV beam peak energy MeV Ne + /N capture2% (4%) e- bunch charge15(7.5)nC5nC1nC bunch length (laser&e - beams) 3 ps Number of laser IPS1010(5)1 Total N /Ne - yield (in all IPs)1010(5)1 Ne + /Ne - yield # of stackingNo stacking V. Yakimenko Compton Linac e + sources Proposed parameters are in black, Optimistic numbers are in Red 23 th July 2010 CLIC meeting L. Rinolfi There is no funding for ATF to work directly for ILC, CLIC or SuperB: development of CO2 regenerative cavity, high repetition rate operations There is an active program to use highest Compton X ray peak flux for single shot user experiments: Started with High efficiency conversion ~1x ray / 1 electron, Spatial distribution of second harmonic (U. Tokyo, KEK) Phase contrast imaging (INFN) Diffraction scattering on the crystal (UCLA) There is an active CO2 development program at ATF required for ILC pulse parameters and amplifier bandwidth is demonstrated Gradual increase of the single pulse intensity is the main goal. V. Yakimenko Summary from BNL 23 th July 2010 CLIC meeting L. Rinolfi 1) Higher harmonics are important and can influence the overall polarization. 2) Polarization and yields are always conflicting, compromises need to be made. 3) Lower energy drive beam (150 GeV) is more practical in achieving high degree polarization than higher drive beam energy (250 GeV). W. Gai Summary from ANL Polarization issues with undulator based e + source Undulator 100 m long and drive beam energy 150 GeV Collimator distance = 700 m Collimator iris = 2.5 mm 23 th July 2010 CLIC meeting L. Rinolfi Shock wave on BN window T. Omori Experiment performed at KEKB 23 th July 2010 CLIC meeting L. Rinolfi Summary from KEK T. Omori 23 th July 2010 CLIC meeting L. Rinolfi 1) Review e + sources of colliders 2) ILC-CLIC e + generation working group Set new milestones 3) Hybrid and channeling e + sources Review design progress for CLIC baseline source Review R&D status and set next goals 4) Compton Review R&D status and design progress Review the industrial, medical, material applications 5) Undulator Review R&D status and design progress Prepare re-baseline for ILC baseline source 6) Liquid Pb and Pure Conventional e+ sources Review R&D status and set next goals Workshop achievements 23 th July 2010 CLIC meeting L. RinolfiILC NewsLine Report 23 th July 2010 CLIC meeting L. Rinolfi Apologizes for the talks which have not been mentioned in this SummaryAll talks from the following link: POSIPOL 2011 POSIPOL 2012 at Hamburg hosted by DESY Conclusion at Beijing hosted by IHEP