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CLIC_DDS Status Report: Overview of Design and Progress as of October 2010

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habib
13 diapositives · 281 Views · Jul 31, 2014

This report summarizes the progress and design status of the CLIC_DDS systems, as presented by R. M. Jones from the Cockcroft Institute and The University of Manchester on October 25, 2010. Key aspects include the dipole mode manifold configurations, field configurations, undamped cell designs, and wakefield studies. The document details various parameters, criteria for performance, and the ongoing development of the CLIC_DDS_A and CLIC_DDS_B structures, alongside the anticipated timelines for qualification and testing phases, including the potential enhancements and R&D opportunities.

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  1. WP 9.2: DDS Status Roger M. JonesCockcroft Institute andThe University of Manchester 1 WP 9.2 DDS Status, R.M. Jones, 25th Oct 2010, WebEx Phone-in, Geneva

  2. Summary of CLIC_DDS_C Dipole mode Manifold mode Manifold ∆f=3.6 σ =2.3 GHz ∆f/fc=13.75% Coupling slot 24 cells No interleaving Meets design Criterion? ∆fmin = 8.12 MHz ∆tmax =123 ns ∆s = 36.92 m ∆fmin = 65 MHz ∆tmax =15.38 ns ∆s = 4.61 m 192 cells 8-fold interleaving 192 cells 8-fold interleaving

  3. CLIC_DDS_E Elliptical Design –E Fields Circular Square Single undamped cell Iris radius=4.0 mm Convex ellipticity Concave ellipticity ε=-8.28 ε=-2.07 ε=-4.14

  4. CLIC_DDS_E Elliptical Design, Single Undamped Cell Dependence of Fields on  Iris radius = 4. 0 mm Iris thickness = 4.0 mm Chosen design

  5. CLIC_DDS_A Wake 24 cells No interleaving • Wake of a non-interleaved 24 cell structure –first structure of 8-fold interleaved structure chosen. • Motivated by high gradient testing • Wake is measurable and provides a useful comparison to simulations (but will not, of course, meet beam dynamics criteria) Undamped Qavg ~1700 Damped 24 cells No interleaving

  6. Matching CLIC_DDS_A I/P • Firstly, match-out either end of structure with regular cells: • Structure for test will utilise a mode launcher • Initially, simulate a structure with one regular cell and two matching cells at either end and we study the minima in S11 as a function of the geometrical parameters of the matching cells (a, L –adopt L variation, rather than b, from space considerations) • Add additional (2, then 3) identical standard cells (const. imp) and follow the same procedure and modify parameters of matching cells to minimise S11 • The matching condition (on a, L) is that which coincident with all 3 simulations. • Secondly, once complete, match-out the full, tapered structure based on this match.

  7. CLIC_DDS_A Axial E-Field Surface E-Field • Match-out the full, tapered structure • E-field and S11 shown E-field Port11 Port 2 7.5 Beam 7 Matching cell Ez (V/m x104) Es (V/m x104) 5.0 0 300 0 z (mm) 225 z (mm) A. D’Elia ~198.6mm

  8. CLIC_DDS_A Eng. Design

  9. Mechanical Eng. Design of DDS_A Water pipes for cooling Vacuum flange Power output Tuning holes Power input Vacuum flange Cutaway-view Beam V.Soldatov

  10. CLIC_DDS_A Prototype Disks 8mm DSA, Front View VDL Fabricated. G. Riddone, Oct 15th 2010!. DDSA, Reverse Side View

  11. Cell Qualification of CLIC_DDS_A • VDL (NL) have machined and measured several cells –end cells. New!(recvd by CERN Oct 2010) • Global profiles made with Zeiss CMM, free state measurement are illustrated for disk 24 • Design, tolerance bounds and achieved profile shown • ETA of all cells –December 2010 • Bonding of complete structure by 1st quarter of 2011. • Shape accuracy 5 µm • 1.7 µm achieved • Roughness Ra 0.025 • Iris region achieved Ra 0.010 Low-force probe: some disks show measuring indents (20 nm depth) after probing on the CMM  Local hardness of the material is not constant.

  12. Work in Progress/R&D Opportunities Standard DDS Manifold Additional Manifold I/P at /2=15.9GHz • CLIC_DDS_A is equipped with mode launchers • CLIC_DDS_B includes full HOM ports • Initial studies on matching the HOM coupler for CLIC_DDS_B in progress (dipole band ~ 15.9 GHz – 18 GHz) • Moving to a high phase advance (HPA) structure allows other parameters to be optimised • 5/6 phase advance structure design in progress (for initial design see Linac2010) • In the HPA design further features being explored • Additional manifold (8) Sic EnhancedCoupling Sic • Influence of SiC rods on overall Q

  13. Final Remarks • Status CLIC_DDS_A : RF (inc. mode launcher) and mechanical design has been completed. • Qualifications cells fabricated Oct 2010! (VDL, NL)–all cells expected Dec 2010 • Structure will be subsequently bonded in the first quarter of 2011 -ready for high power testing in 2011 at the CLIC test stand. • Status CLIC_DDS_B: Equipped with HOM couplers –design underway • New CLIC_DDS R&D in progress: • HPA : High phase advance (5/6) design is being studied. Allows optimisation of remaining parameters –minimise surface fields, wakefields at stipulated vg, maximise luminosity and efficiency • Novel enhancements to wakefield optimisation with a view to optimising efficiency and increasing luminosity –additional manifolds, SiC rods. • Submitted joint (CERN et al) proposal to participate in FACET wakefield tests (important to verify DDS wakefield simulations) • More details here: • http://ilcagenda.linearcollider.org/getFile.py/access?contribId=526&sessionId=83&resId=1&materialId=slides&confId=4507