RaDIATEOctober Technical Meeting October 8 2015

BLIP Irradiation Planning

R a d i a t i o n D a m a g e I n A c c e l e r a t o r T a r g e t E n v i r o n m e n t s

RaDIATE News and Notes 12th International Workshop on Beryllium Technology

Satellite meeting of International Symposium on Fusion Nuclear Technology

V. Kuksenko presented RaDIATE work on NuMI Be window examinations

BeGrid (HRMT-24) experiment took beam at CERN Highest intensity pulse: 216 bunches of 1.3e11 ppb at 0.3 mm

sigma beam spot Online instrumentation indicates rough agreement with simulation Plastic regime reached, no visual evidence of melting or

sputtering PIE to start at Oxford in January

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RaDIATE News and Notes PASI (Proton Accelerators for Science and Innovation) 2016

Nov 11-13 at Fermilab US/UK meeting (others are welcome)

HPTW (High Power Targetry Workshop) 2016 April 10-15 at Oxford At least one materials session

NSUF pre-proposal submitted Fermilab, PNNL, Michigan, Oxford Triple-beam irradiation of beryllium at Michigan PIE at PNNL

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BLIP Irradiation Planning Input collected

Primarily studies initiated by Fermilab FRIB/MSU, CERN, ESS also proposed studies

First pass using dE/dx (SRIM tables) at proton energy “budget” Assumes 8 capsules of samples 200 MeV beam in 112.65 MeV beam out (to US window of isotope targets box)

Next steps Simulation of individual sample materials for DPA and Edep Modify capsules to include “vacuum degrader” spaces Modify capsules to adjust for desired irradiation temperatures Modify sample layers for PIE requirements (sample geometry) Detailed simulations to assess energy “budget” and thermal

performance

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Spreadsheets Go to input spreadsheet and energy “budget” spreadsheet

Note many details in energy “budget” spreadsheet If you play with this yourself, be careful as some energy

degradation values are calculated from curves (will update with changes) others are manually entered from SRIM tables (will not update automatically)

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Capsule and “Basket” Geometry Capsules contain layers of samples Capsule design is within our control (within reason) Capsules sit within capsule holders which fit inside the BLIP

target basket We will make our own basket

Basket MUST conform to the BLIP requirements on outside dimensions and features to interface with BLIP drive box

Basket will be designed to interface with our custom capsules on the inside

Each “user” will be responsible for: Design and fabrication of their samples to fit capsules Conceptual design of their capsule(s) for thermal/structural

performance But expected to follow BLIP/Fermilab guidance

Most likely capsules will be fabricated, assembled and welded at BNL or Fermilab

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Capsule and Basket from 2010

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Capsule loaded with samples

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BLIP drive box and basket

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Drawings and Layouts

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Capsule Holder Geometry

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Tensile Sample Geometry (depends on PIE equipment!)

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“CTE” sample geometry

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Next Steps Users: Review Test Matrix ASAP

Confirm materials, number of layers, thicknesses, sample types Work with PIE suppliers to obtain acceptable sample geometries Review dose and temperature requirements

BNL: Identify nominal beam parameters Likely average beam current or flux Likely beam spot size Acceptable running periods (how long of a run is possible?)

Fermilab: Simple Calculations and Simulations Peak DPA per material Energy deposition First pass thermal calculation to identify capsules needing

insulating layers

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Goal of these next steps Identify test matrix modifications to accommodate PIE

requirements Provide information for detailed sample and capsule design Identify capsules/materials needing thermal insulation to

reach acceptable irradiation temperatures Assess expected total DPA and weigh against expectations Get Users to start communicating with PIE suppliers to

ensure sound experiment design Allow scheduling of the run with the packed BLIP schedule

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BLIP visit in November Planning for a BLIP visit November 18-20 Useful for Users to visit to see the facility and assess BLIP

PIE capabilities Possibly another visit is possible early in 2016?

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A word on irradiation temperature Go to P. Hurh’s 2010 presentation on thermal modeling

Can use vacuum in capsules (may result in too high temperatures?) (weld at BNL)

Can use gas in capsules such as He or Ar (weld at Fermilab)

Can use additional layers of samples (combine capsules) or insulators (adds to energy budget) to achieve higher temps on middle-most layer

NOTE: Largest delta T is usually from capsule surface into water (6,000-7,000 W/m2/K). Cooling water is boiling!

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Questions? Work through e-mail please Another meeting to be planned soon!

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