GADGET* - Motivation - Work packages Wigglers Intra Beam Scattering Instrumentation Test Beam

1. ESGARD Open Meeting on FP7-IACERN, 10-11 September, 2007 NAS Integrated Activity GADGET* - Motivation - Work packages • Wigglers • Intra Beam Scattering • Instrumentation Test Beam • Vacuum Systems • Budget guidelines and status _______________________________ *Generation And Diagnostics Gear for tiny EmiTtance Hans-H. Braun, ESGARD OMNIA meeting, 10.9.2007

2. Key Ingredients for Linear Collider Generation of high brightness e- & e+ beams Accelerate fast & efficient Preserve brightness up to IP

3. Key Ingredients for Linear Collider Generation of high brightness e- & e+ beams GADGET Accelerate fast & efficient Preserve brightness up to IP

4. Linear collider damping rings are extrapolating technology of SR Light sources 3rd generation light source Stochastic SR emission SR cooling from bending magnets Equilibrium beam emittance SR insertion devices Intra beam scattering Cooling Heating LC damping ring Stochastic SR emission SR cooling from bending magnets Intra beam scattering Equilibrium beam emittance SR insertion devices e+ , small e, time structure vacuum system instabilities

5. Damping rings and 3rd generation SR facility parameterstable from Yannis Papaphilippou Key component to get high brightness are dampings ring

6. CLIC damping ring • Emittance IBS dominated, 4 x zero current emittance) • Very strong damping with 2.5 T, lW=5cm s.c. wiggler • Open issues: Wiggler technology, reliability of IBS calculations, e-cloud… M. Korostelev

7. SC Wiggler Workpackage • Goals • Demonstrate technical feasibility of wiggler magnets anticipated for CLIC • Explore the technical limits • Get input for LC damping ring design

8. SC Wiggler workpackage • Partners & Facilities • BINPSC Magnet production and measurement facilities • ANKA2.5 GeV e- storage ring with straight section dedicated for ID R&D • CERN AT-MCSSC cable characterization, coil technology

9. Only superconducting wiggler magnets with unprecedented parameters • can provide sufficient damping strength. • BINP and ANKA have made paper studies for such wigglers, • Documented in conference papers at EPAC’06 and PAC’07 • Both, BINP and ANKA have an impressive record of achievements with this type of magnet technology • In GADGET we want to design & produce two full size (2m) prototypes of each wiggler type including magnet measurements and tests with beam in ANKA 2.5 GeV SR source. • Goals are • Demonstrate feasibility of wiggler concepts • Understand limitations and permissible parameter space for wigglers (therefore two types !) • Get realistic wiggler description for beam dynamics

10. BINP PM wiggler BINP SC wiggler ANKA SC wiggler Contour plot of horizontal emittance with IBS as function of wiggler parameters Sketches of BINP wiggler Low vertical beta-optics in the long straight sections of ANKA: βx =14 m, βy = 1.9 m, εx = 40 nm

11. IBS Workpackage • Goals • Improve Intrabeam scattering theory for reliable predictionof beam performance in unprecedented parameter regime • Validate theory with measurements in existing SR facilities

12. IBS Workpackage • Partners & Facilities • Cockcroft InstituteDevelopments on IBS theory in Robin Tuckers groupWell equipped theoretical toolbox • ANKAExperiments in ANKA (commitments for beamtime linked with wiggler WP) • CERN(no requests, thesis supervision together with EPFL) • PSI (associated , no requests, thesis supervision together with EPFL)Experiments in SLS • LNF (associated, no requests)Experiments in DAFNE

13. IBS workpackage • CLIC DR’s emittance will be dominated by IBS • ILC DR’s emittance has considerable contribution from IBS • Predictive power of existing theory for this regime is more than questionable • New approaches to compute phase space distribution • Methods to predict halo generation due to IBS • IBS and beam polarization • Ad initio design of magnet lattice for minimum IBS+SR emittance • Experimental verification of theory with experiments in existing storage rings • See slides of talks at IBS’07 workshop at Cockcroft Institute

14. ATF Results

15. ITB Workpackage • Goals • Provide dedicated facility for beam instrumentation developments • Enable development of novel diagnostic techniques critical for LC’sperformance • Provide an European infrastructure for training opportunities in beam diagnostics

16. ITB Workpackage • Partners & Facilities • John Adams Instituteworkshops • CERNCTF3 • LAPPworkshops and measurement labs • TU Berlinworkshops and measurements labs • Univ. Heidelberg • Univ. Karlsruhe (associated) • CEA-DAPNIACalifes probe beam injector in CTF3

17. 1.85m F D F D D D D D D D D D D F F F F F F F D D F F F D D 16.6 m 16 m 2.5m 1.4 m 22.4 m D F 8 m F F F F F F F F D D D D D D D D 1 LIL-ACS LIL-ACS LIL-ACS 1.4m 3.0m 3.0m 23.2 m DUMP 6 m 42.5 m Instrumentation Test Beam Line , ITB in CTF3 Dedicated beam line for beam diagnostics R&D using CALIFES beam Features: low e beam, possibility to achieve very short bunch length, variable time structure, space, accessibility Beamline design and construction JAI, LAPP and CERN Diagnostics R&D in ITB requested in GADGET Coherent diffraction radiation methods JAI BPM’s for integration in DR-wiggler cryostat TU Berlin and LAPP Quantitative halo monitors Univ. Heidelberg and Karlsruhe Gas jet for “calibration halo” Univ. Heidelberg and Karlsruhe Single shot emittance measurements CERN Layout of CLEX-A (A=Accelerator housing) floor space DUMP D F TBL TL2’ DUMP TBTS DUMP 1.4m 0.75 CALIFES probe beam injectorprovided by CEA-DAPNIA ITB DUMP walk around zone

18. CERN contributionions to ITB • Floor space • Technical infrastructure • Magnet and Vacuum power supplies • Control system infratructure • Cabling

19. LAPP BPM electronic development for CTF3 BPI Acquisition (ethernet) analog module RJ45 digital module

20. C.P. Welsch et al Meas. Sci. Technol. 17 (2006) 2035c C.P. Welsch et al Proc. SPIE Europe Optical Metrology (2007) Design of High Dynamic Range Beam Profile MonitorsHeidelberg University Pre studies started at CTF3 in 2003 • Novel camera systems • >105 dyn. range • Able to define regions of interest • Fast acquisition • Core masking technique / Micro Mirror Array • Measure profile • Define halo region • Use mirrors to block (intense) light from core

21. Experimental Studies on Beam Halo Principle: • Development of gas jet with highly flexible geometry (intensity and shape), • Generation of desired halo distribution, • Measurements with high dynamic range monitors, • Goal: Benchmarking and improvement of models. Beam + Halo Beam Gas jet curtain

22. Vacuum systems workpackage • Goals • Develop technical solutions for the vacuum system for linear collider damping rings • Get data set for coating as required for reliable prediction of damping ring performance

23. Vacuum systems workpackage • Partners & Facilities • LNFDAFNE (e+ beam for e-cloud studies !), vacuum lab. • Cockcroft InstituteVacuum lab • CERN (TS-MME & AT-VAC)Coating facilities, surface physics lab, vacuum lab • ESRFcoating facilities, vacuum lab,SR beamline for photoemission yield measurements

24. Vacuum systems • Major worries for DR’s are instabilities due to Ions and e-cloud. • Reduction of residual gas pressure and reduction of secondary emission • with appropriate coatings (NEG, TiN,…) may cure these efffects. • This requires a good understanding of a wide range of coating properties and • fabrication techniques. There are potential spin-offs with other CLIC and ILC • vacuum systems, but also with LHC injector chain. • LNFTest of vacuum chamber coatings with beam in DAFNE ring • Cockcroft Institute Behavior of NEG coatings under conditions close to those expected in damping rings.  Measurement of photo-electron yield, photon-stimulated desorption rates, conditioning rates, ….  Some data are already available, but need for a set of systematic and rigorous measurements to be able to design a vacuum system with confidence. • CERNCorrelate SEY with surface composition and conditioning Develop new production technique for NEG coated vacuum pipes of small diameter (few mm) Improve capability to simulate vacuum properties in long chambers pumped by NEG films

25. VACUUM@CERNFOR GADGET P. Chiggiato & J.M. Jimenez XPS and SEY meas. integrated Coatings and production techniques 1450 CERN made NEG-coated pipes installed in the LHC • Our experience: • Vacuum in the largest accelerator complex • Production and characterisation facilities already available • Tests benches for ECloud studies already available (SPS & PS) • Commissioning of LHC & Injectors • Where the NEG films were born and grown e-cloud detection SPS & PS dedicated benches M-C simulation

26. Present status of GADGET budget estimate all numbers in k€

27. Budget guidelines from ESGARD (as communicated by Erk Jensen)and present status Target for GADGET total cost 3.0 M€ + 1.5 M€ (optional) = 4.5 M€ Target for GADGET request to EU 1.0 M€ + 0.5 M€ (optional) = 1.5 M€ Target for commitments / EU request 2.0 Present GADGET total cost9.0 M€ Present level of EU request2.8 M€ Present commitments / EU request 2.2 • Comments • 1st round of systematic accounting of indirect cost boosted EU request from ~2.1 M€ to 2.8 M€ • Commitments can be booked elsewhere, but considerable fraction comes from Labs without direct representation in ESGARD • Vacuum systems activity included at request from ILC community after guideline was given • Very personal opinion: By creating awareness of existing capabilities & facilities in partner labs EU requests can probably be reduced to ~2.0-2.4 M€. Further reduction implies abandoning one of the heavy workpackages