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?