LOW- ε -RING network

1. LOW EMITTANCE RINGS 2011, HERAKLION, GREECE, 3-5 OCTOBER 2011 LOW-ε-RINGnetwork Yannis PAPAPHILIPPOU, CERN With input from LOWεRING collaborators October 4th, 2011

2. WP3b: LOW-ε-RING • Bring together scientific communities of synchrotron light sources’ storage rings, damping rings and lepton collidersin order to communicate, identify and promote common work on topics affecting the design of low emittance lepton rings • Initiated by a Low Emittance Ring workshop, 01/2010@CERN, see http://cern.ch/ler2010 • State of the art in design of accelerator systems especially in X-ray storage rings approaches the goals of damping rings for linear colliders and future B-factories’ upgrade projects • Common tasks identified including beam dynamics but also technology • Second workshop in 10/2011 @ Heraklionacts as a catalyzer, see http://cern.ch/lowering2011 • Collaboration network enable scientific interaction and coordination for common design work including measurements and tests in existing facilities for achieving ultra-low emittance, high intensity beams with remarkable stability • Possible synergy with other work packages mentioned in the proposal (XBEAM, Super-conducting magnets, RF)

3. Task 1: Low Emittance Ring Design (LERD) Sub-Task 1.1: Optics Design of Low Emittance Rings (ODLER) Sub-Task 1.2: MInimization of Vertical Emittance (MIVE) Coordinator: M. Boege (PSI) Task 2: Beam INstabilities, Impedances and Vacuum (BINIV) Coordinator: R. Nagaoka (SOLEIL) Task 3: Low Emittance Rings Technology (LERT) Sub-Task 3.1: Insertion Device, Magnet design and Alignment (IDEMA) Sub-Task 3.2: Instrumentation for Low Emittance (ILE) Sub-Task 3.3: DEsignof Fast KIcker Systems (DEFKIS) Sub-Task 3.4 RF DEsign (RFDE) Coordinator: H. Schmickler (CERN) Looking for sub-task coordinators! Tasks

4. Methods, approaches and numerical tools for designing ultra-low emittance optics in low emittance rings Optics design of multi-bend achromats in conjunction with damping wigglers Evaluation of the potential benefit of dipole magnets with variable bending field or Robinson wigglers Numerical tools such as GLASS and multi-objective algorithms for linear and non-linear dynamics optimization Reducing collective effects through optics design Low momentum compaction factor optics for reducing the bunch length and produce coherent synchrotron radiation. Experience of running existing storage rings or test facilities in these conditions Sub-task 1.1: Optics design Low-ε-Ring workshop 2011

5. Methods for obtaining sub-picometer vertical emittances with high-intensity beams, Extremely good control of magnetic error tolerances and geometric alignment of the magnets are required, but also a Combination of diagnostics for precise beam size, position and emittance measurement as well as on-line correction techniques. Profit from the experimental work carried out in light sources such as SLS, DIAMOND, ASLS or ESRF but also in test facilities such as ATF and CESRTA Sub-task 1.2: Minimization of Vertical Emittance Low-ε-Ring workshop 2011

6. Focus on theoretical, numerical and experimental methods for impact of collective effects and instabilities in low emittance rings and interplay with vacuum and coating technology. Collaboration profit from experience of operating accelerators on vacuum methods (including laboratory tests), impedance reduction campaigns based on beam measurements and impedance degradation leading to heating, pressure rise and ion instabilities Common efforts for code benchmarking against theory and experiments in storage rings and test facilities. Focus on the optimization of the beam impedance of accelerator components with non-linear tapers, kickers, clearing electrodes, etc. Task 2: Beam Instabilities, Impedances and Vacuum

7. Coordinate and integrate activities involving technology and design of insertion devices, magnets and alignment Operational and manufacturing aspects of insertion devices including super-conducting materials with novel wires Cryogenic and vacuum technology in the presence of high heat loads due to synchrotron radiation. Novel measurement techniques like the vibrating wire are necessary for accurately estimate the magnetic errors Inclusion of errors in tracking codes for evaluating their impact to the beam stability. Beam based alignment techniques and real time alignment technologies for reaching the very low emittance and enhance long-term stability. Sub-task 3.1: Insertion Device, Magnet Design and Alignment Low-ε-Ring workshop 2011

8. Advance scientific communication and establish contacts within instrumentation specialists for common studies and experimental programs in existing rings and facilities, addressing calibration and stability/repeatability issues of employed instrumentation. Beam measurement techniques for reaching ultra-low emittances for instrumentation BPM systems for submicron orbit feedback and vertical dispersion control of a few mm, including turn-by-turn capabilities with micrometer resolution Synchrotron radiation monitors with very wide dynamic range for measuring beam sizes of a few microns, and bunch lengths of ~1mm. Wideband feedback systems in the range of GHz able to measure, control and damp multi-bunch instabilities with fast rise times. Use existing storage rings as test-beds for future linear colliders’ instrumentation (e.g. TIARA-SVET) Sub-task 3.2: Instrumentation for Low Emittance Low-ε-Ring workshop 2011

9. Kicker technology fundamental for producing very stable pulses Closing tightly the injection bump during top-up operation in storage rings Stable extraction from damping rings. Low impedance strip-line kickers with broadband requirements and high voltage reliability Fast rise- and fall-time high voltage pulsers with good amplitude stability and high reliability. Collaborative effort will involve Pulsed magnet design for on-axis injection schemes, Double kicker systems in test facilities Experimental methods for minimizing kicker-induced orbit errors. Sub-task 3.3: Design of Fast Kicker Systems

10. Goal of this task is to exchange information and coordinate design efforts and experimental tests in the field of RF cavity design for various bunch structures RF powering (solid state amplifiers vs. klystrons), super-conducting RF technology, and low level RF system design RF systems contribution in total machine impedance and parameters optimization to reduce it Sub-task 3.4: RF design Low-ε-Ring workshop 2011

11. Deliverables

12. Milestones • Maybe organize common events with other work packages

13. Collaboration board • Chairman: Y. Papaphilippou (CERN) • Deputy: S. Guiducci (INFN-LNF) • Members: R. Bartolini(STFC-JAI-DIAMOND), M. Biagini (INFN-LNF) • Task coordinators: M. Boege(PSI), R. Nagaoka (Soleil), H. Schmickler (CERN) • Sub-task coordinators • Additional non-EU members: M. Palmer (Cornell),J. Urakawa (KEK) • To be confirmed: Contractual partners or participants

14. Collaboration partners • Interest expressed by the 25 following institutes: ANKA-KIT, ANL, Australian Synchrotron, BESSY/HZM, BINP, BNL-NSLSII,CELLS-ALBA, CERN, Cockroft Ins, CIEMAT, Cornell Un., DESY, Elettra, ESRF, FNAL, IFIC-Valencia, INFN-LNF, JASRI/SPring-8, JAI-DIAMOND, KEK, LBNL, MAXLAB, PSI-SLS, SLAC, SOLEIL • A message will be sent to a mailing list including workshops’ participants and other interested colleagues, with the proposal and table to be filled • Please circulate it among your colleagues and confirm your interest

15. Resources • Assumed matching funds for 400KEuros (entirely personnel for coordination) • Matching funds based on maximum salaries (experience of >15years) projected to 2015 • Total of ~400KEuros

16. Next steps • Finalize proposal within this month • Collaborating institutes list finalisation • Sub-task coordinators • Budget refinement • Next Eucard2 meeting next week at CERN • Full proposal to be submitted by the end of the year

17. “Η ισχύς εν τη ενώση”,Strength in unity,Αίσωπος (Aisopos), around 6th century b.c.