UKNF - Status, high lights, plans J. Pozimski

1. UKNF - Status, high lights, plansJ. Pozimski

2. WP1 - Major achievements IDR written, edited and published ECFA review Costing meetings – UKNF leading activity on NF Redesign of Target area for risk mitigation Investigation of particle dynamics in the baseline muon front end lattice and investigation of the performance of alternative lattices Studies of power deposition in the target and pion capture area due to secondary radiation Studies of solid and liquidized power jet targets for mercury risk mitigation Multi-particle simulations of the muon linac using field maps, comparison of gained results from various software packages with good agreement in transversal and longitudinal particle dynamics and particle loss pattern. Detailed studies of beam injection and extraction into the FFAG, studies of kicker and septum design as well as kicker electronics. Further studies of FFAG magnets and particle tracking in fieldmaps. Further progress on common proton driver work (ISIS upgrade)

3. Proton driver status:Bunch Compression • Bunch compression simulation performed for RAL 3.2-9.6 GeV RCS • Simulated in ESME – 1D longitudinal code from Fermilab • ESME is simple, fast and has a long history but has weak feedback (RIRO) • Following plots: 500 particles, no space charge 24/09/2014 IDS-NF Plenary 3

4. Simulation using ESME RF Waveform – 3.6 MVmax, in 0.01 sec 2.52 ns rms 26.6 ns rms 24/09/2014 IDS-NF Plenary 4

5. Target station design evolution Due to the increase field volume the particle capture was increased compared to the old target station, expected to become new baseline layout at IDS meeting in April

6. Front end design work  Muon Front End baseline description: Longitudinal drift Buncher Phase-Energy Rotation Ionisation Cooling Risks and mitigations : Transmission losses and secondary particles -> Chicane RF break down in magnetic fields ->Bucket coil lattice

7. Chicane for secondary particle suppression Heat deposition from secondaries is significant: Three issues: Activation of the linac Heat load on superconductors Radiation damage Losses are 2-3 orders of magnitude too high → Mitigation: Chicane for high momentum particles Proton absorber for low momentum protons as protons stop quicker than pions/muons in material Transverse collimation

8. High power RF in magnetic field Reduced magnetic field at RF cavities May enable higher accelerating voltage Comparable transmission For identical number of cells (but longer footprint) Increased magnetic field energy (and cost) Newest results show improved performance compared to study 2a Expected to become new baseline in April meeting. First indication of 6D cooling

9. Linac & RLA’s • Linac and RLAs. • Linac and RLA1 design updated following discussions at the • Mississippi meeting. • Presented updated design at IPAC 2011. • Information has been input into the ADT for the linac. • RLA1 all beam elements designed and ready for costing, • RLA2 requires EM design of magnets (dipoles, QP & sextupoles). • First costing of Linac and RLA’s to be available before • Multiparticle tracking and performance analyses planned for • Summer 2012,

10. High energy acceleration 12.6 -25 GeV (NS-FFAG) • Lattice design has been updated. • Beam dynamics has been crosschecked using independent codes. • Preliminary magnet design was studied. • Injection/extraction has been designed. • Engineering studies has been initiated. • The principles of NS-FFAG are being tested at EMMA. • Chromaticity correction scenario still to be defined! [MeV] Conceptual engineering layout of the NS-FFAG cell Simulations of acceleration time [ns]

11. Muon Storage Ring work (D. Kelliher, J. Pasternak, C. Prior, Su Wan, Norbert Collomb, Neil Bliss, A. Kurup)(July 2011 – December 2011) Established injection scheme into the production straight with achievable septum and kicker strengths. (D.K.) Identified injection timing problem - Kicker rise/fall time could be challenging with <500ns between bunches. (C.P., D.K.) Document to allow costing of ring put together using accelerator design tool. (D.K, A.K.) Design of insertion into arc to ease injection. (J.P, S.Y) 10 GeV design for LENF (J.P., S.Y) Preliminary work for tunnel layout – consideration of module installation, access shafts, health & safety legislation, services etc (N.C., N.B)

12. Costing exercise • Costing of the Accelerator complex. • Detailed definition of the breakdown structure for the whole facility. • Development of the Accelerator Design Tool (ADT). Spreadsheet to store the physics design and the costing information in the same format. • Development of macros for the ADT • Translation macros needed to upload the information in the format required by the CERN costing tool. • Macros to produce MADX and G4beamline input files to verify information in the ADT and feedback engineering considerations to accelerator physicists.

13. FETS Status Ion source operates at nearly design specs (2 ms, 50 mA) but persisting problems with heater electronics and spare parts LEBT characterization nearly complete, but origin of residual source misalignment still unknown Beam at injection into RFQ ~ 0.3-0.35 pimmmrad (measured) Detailed study of influence of RFQ modulation on field flatness finished and RFQ design adjusted. RFQ manufacture started Unitil 31 March, 1st section manufactured, section 2-4 roughing stage finished Preliminary cost estimate for manufacture 160-200 k£ - 6 month Still expecting circulator to be delivered, high power RF distribution ordered, setup to be finalized until summer Work focus shifted towards MEBT.

14. The FETS ion source can deliver 60 mA H– to the RFQ @1 ms 50 Hz or @2 ms 25 Hz Normalised rms emittances: H 0.49 πmm.mRad V 0.29 πmm.mRad Focus now on ion source plasma investigations. First spectroscopic analyses finished, and further activities in collaboration with CERN and university of Jyväskylä (UV spectroscopy). Dan Faircloth, Scott Lawrie, ISIS

15. LEBT Experimental Results Comparison of emittance measurements with simulations Transverse emittances for 50 mA beam measured in diagnostics vessel Emittances for 50 mA beam calculated for experimental parameters using GPT J. Back Warwick

16. RFQ Manufacture The machine shown is typical of the type of machine required to produce the RFQ. Large, rigid and precise – not a combination that many manufacturers invest in.

17. RFQ Manufacture NAB Precision Engineering Ltd machined the outer face of one major vane block flat and then machined one roughing pass of the internal vane profile maintaining a distance of at least 10mm from the finished profile. This was done to assess the deformation due to the internal stresses that are induced during the hot rolling production process. A sufficient number of roughing passes will be required tuntil the copper is stable to less than the finished tolerances. This deformation of the outer face was measured after the vane profile machining was performed. The result was a very encouraging 0.10mm.

18. Stress analyses for assembly procedure P. Savage Imperial To avoid deformation of RFQ vane pieces in the assembly process a special Carrier for assembly is made. The projected deformation is far below the tolerances. Ready for RFQ production - Request of quotes this month, delivery until March 2012.

19. High power RF system Klystron and waterload delivered and tested to 1 MW, circulator expected to be delivered, RF distribution system on order, structural support in preparation.

20. MEBT Engineering The SNS MEBT shown here gives an idea how the finished FETS MEBT will look. RFQ manufacture RFQ ancillaries RFQ assembly Klystron power delivery RGIS MEBT Engineering Downstream of the MEBT We are planning a three year Engineering program starting April 2012: Year 1: Engineering Design Year 2: Engineering drawings and preparation for manufacture. Year 3: Manufacture, procurement and installation. Who? Ciprian, Mike, Pete

21. FETS proposal and Review

22. Summary • The IDR and numerous Publications, invited talks, PhD's, etc. • 1 IDS plenary meeting • EUROnu Costing workshop • EUROnu safety workshop this week • Work package meetings and workshops • Significant contribution to EMMA commissioning • UKNF overall on schedule and budget. Overall good progress on all fields • Momentary focus on RFQ and RF distribution • MEBT engineering design started, will intensify as soon as RFQ is in production • CH structure from 3 MeV onwards in first design phase • Expecting funding decision for a 3 year period. • Strengthen collaborations with ESS, CERN, FNAL.