Chris Densham High Power Targets Group Leader Technology Department STFC Rutherford Appleton Laboratory. FNAL / STFC collaborations on neutrino target R&D. Collaborations on neutrino targets between Fermilab and STFC/RAL. LBNE & NuMI (LE) target studies & prototyping.
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LBNE & NuMI (LE) target studies & prototyping
1st NOvA (ME) target for 700 kW beam
2nd NOvA target under manufacture
Mu2e target design, development & materials testing under way
Be window experiment proposal for HiRadMat
UK/STFC/RAL Otto Caretta, Tristan Davenne, Chris Densham, Mike Fitton, Peter Loveridge, Matt Rooney, Joe O’Dell, Geoff Burton, Steve Jago, Dave Turner, Richard Day, Don Clark (DL), Roger Bennett, Ali Ahmad (Sheffield Uni)
Fermilab: LBNE/NuMI/NOvA: Patrick Hurh, James Hylen, Kris Anderson, Mike McGee, Cory Crowley, Bob Zwaska, Sam Childress, Vaia Papadimitriou
US Mu2e: Ron Ray,Rick Coleman, Patrick Hurh, Jim Popp, Vitaly Pronskikh, Larry Bartoszek, Steve Werkema, Kurt Krempetz, Anthony Leveling, Andy Stefanik, Kevin Lynch, Igor Rakhno, Adrienne Dee Hahn, George Ginther, Michael Campbell, Horst Friedsam, Michael Gardner, Nikolai Andreev, Jeff Brandt, Vladimir Nagaslaev
Longitudinal force in inner conductor
Combined effects of: 1 ms 300 kA current pulse + 2.3 MW 120 GeV beam pulseTarget diameter dominated by Lorentz forces->combined target/horn inner conductor not recommended
Horn current pulse effect
Heat transfer coefficient
Otto Caretta & Tristan Davenne
How joint ended
Problems of stress waves in existing IHEP stainless steel water pipes causing NuMI target failures
How joint started out
Otto Caretta / Peter Loveridge /Tristan Davenne
Complex & delicate upstream region causing joint failures
Graphite to titanium braze prototype
Minimum & simple joints within target container
Single piece titanium tube bending
Mike Fitton/Joe O’Dell/Geoff Burton
MET-01 Manufactured, delivered and installed
MET-03 Currently in assembly at RAL
Measurement of heat transfer in target fins using thermal imaging camera identified thermal issue with cooling of budal monitor fins. Redesign of bracket more than halves the operating temperature rise.
Simulation of natural convection and radiation inside target vessel. Used to estimate target fin operating temperatures and emissivity requirements of outer vessel.
Mike Fitton + Tristan Davenne
High quality welds (NAS 1514 Class II or better) in 6061 aluminium proved very difficult to produce consistently.
Some welds were completely removed by marching pipe stubs from solid
By visual inspection welds look very good. Radiography reveals significant porosity
Latest socket weldNo porosity visible on radiography
Parameters explored to optimise weld:
Cleaning (including etching)
Filler wire selection
AC current/balanceGas (Helium/Argon Blend)
Mike Fitton + Joe O’Dell
Cosmic Ray Veto not shown
Water cooling streamlines
Wire tensioning springs
Titanium mounting ring
Question: how to reproduce a similar time varying stress and temperature using a pulsed power supply instead of a beam?
Mu2e Target Operating Conditions
Steady-State Von-Mises Stress Field
D.C. Current Distribution
Qrad ~ 200W
160A D.C - equivalent heating to 1.6kA 1msec pulses @20 Hz
Volumetric Joule heating (J2ρ) mostly occurs over this length