1. WG 4: High Power Proton Accelerators S. Holmes, J. Thomason PASI Collaboration Meeting April 3-5, 2013

2. Agenda H- Source Development Novel Approaches to High Power Proton Accelerators Diagnostics and Instrumentation – PXIE – FETS – ISIS RF Systems Development – SRF Development at Fermilab – SRF Development at Daresbury Test Facilities – PXIE – FETS – Test Facilities at Daresbury Beam Dynamics Modeling and High Performance Computing – Linac Modeling/ASTeC – ISIS Upgrade Modeling Joint with WG6 WG6 Report

3. H- Source Development Objectives – High current sources to feed high power proton facilities Status – RFQ upgrade to Fermilab source – FETS development for next generation source Goal: 60 mA x 2 msec x 50 Hz @ 65 KV Achieved: 60 mA x 1 msec x 50 Hz – Minimal HV breakdowns

7. H- Source Developments Future Opportunities – Cs trapping with elimination of 90 o bend – Optical spectroscopy to determine plasma parameters (VESPA) – LEBT chopping

8. Novel Approaches to High Power Proton Accelerators Objectives – High intensity proton beams from rings with novel focusing characteristics: – IOTA (Integrable Optics Test Accelerator) – ASTA (Advanced Superconducting Test Accelerator) Status – New approach to very high intensity beams: strong non- linearity  Landau damping – Integrable Hamiltonian: stable particle motion at large amplitudes (4D) – Self-consistent space charge? – Simulations promising

13. (No space-charge)

14. Novel Approaches to High Power Proton Accelerators Future Opportunities – What is potential UK interest (IOTA or ASTA)? JAI to coordinate?: educational mission Relevance to ISIS upgrade? (Sergei to followup) Contact with S. Gibson (new JAI appointment/RHUL) – Other areas of interest: electron lens (HiLumi LHC)

15. Diagnostics and Instrumentation Objectives – Provide instrumentation for characterization and control of high intensity proton beams – Emphasis on front end (first 0 – 25 MeV) + ISIS Status – Similar suites of instrumentation under development Beam current; beam position; beam profile/emittance; beam loss; beam halo; (beam extinction) – Multiple approaches PXIE requires diagnostics responsive to variable bunch patterns – C. Gabor visit to HINS in December Characterization of light output from scintillator – First PASI post-doc engaged: Richard D’Arcy – Continued strong collaboration between SNS/ISIS

24. Diagnostics and Instrumentation Future Opportunities – Richard as conduit for knowledge/experience/information flow between FETS and PXIE – Joint participation in FETS/PXIE beam commissioning – Ionization monitor (ISIS, Booster) – PIP/ISIS upgrades – Scintillator based profile monitor (FETS), loss monitor (ISIS)

25. Beam Dynamics Modeling and Applications of High Performance Computing Objectives – Establish commonality in modeling between ASTeC/ISIS, Fermilab, and SNS Status – Foil modeling: personnel contacts established Materials characterization needed for further progress – ORBIT development hasn’t really taken off

33. Beam Dynamics Modeling and Applications of High Performance Computing Future Opportunities – Linac modeling Establish models for 50+ year old linacs SC linac modeling – Space-charge resonances (@J-PARC) – Discuss ORBIT development (w/SNS) – ISIS Upgrade: Activation modeling w/MARS

34. Summary Follow-up on areas for collaboration identified at January 2012 meeting – New opportunities are largely within this context Everything should have happened without PASI; guess ~25-30% of work would have not have happened without PASI – Joint post-doc – Instrumentation cross-pollination – Lab visits But general awareness of what we are doing is helpful – Comment: Learned some new things about what was happening at the home lab! Value in having SNS (and BNL) participation in these meetings Many future opportunities – resources?