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WG 4:High Power Proton Accelerators
S. Holmes, J. ThomasonPASI Collaboration Meeting
April 3-5, 2013
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
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
H- Source Developments
• Future Opportunities– Cs trapping with elimination of 90o bend– Optical spectroscopy to determine plasma
parameters (VESPA)– LEBT chopping
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
(No space-charge)
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)
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
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)
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
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
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?