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UKNF 15 September 2004 Target Studies J R J Bennett RAL

UKNF 15 September 2004 Target Studies J R J Bennett RAL. The Plan Investigate, with RMCS , the possibilities of making off-line tests to determine the strength characteristics of tantalum at 2000 ° C. Obtain beam time at ISOLDE (or ISIS ) and make measurements. This will give:

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UKNF 15 September 2004 Target Studies J R J Bennett RAL

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  1. UKNF 15 September 2004 Target Studies J R J Bennett RAL

  2. The Plan • Investigate, with RMCS, the possibilities of making off-line tests to determine the strength characteristics of tantalum at 2000°C. • Obtain beam time at ISOLDE(or ISIS) and make measurements. This will give: • a) strength characteristics of tantalum and tungsten at 2000°C. • b) show if the target breaks after a few pulses. • 3. Computer model the target and determine the optimum geometry.

  3. Target Studies • Alec Milne (FGES Ltd) has done a scoping study. It shows damage to the target! 20 cm 2 cm dia

  4. Different models m Alec Milne, Jim Dunnett and Richard Brown, FGES Ltd. The radius of the bar versus time for a single pulse. Temperature jump from 300 to 2300 K.

  5. Models Equivalent “Accumulated” Plastic Strain versus Radius.

  6. Equivalent

  7. Equivalent

  8. We need to understand the results! • We need to decide if we are to do more work on solid targets. Options are • to continue • to switch to the Mercury Jet – TT2A Expt. • Have decided to continue with solid target studies. In-beam tests at ISOLDE Modelling

  9. We are writing a specification for existing and further modelling work: • Pbar target – Room temperature - Can do now! • ISOLDE target • NF target

  10. We are writing a proposal to ISOLDE to do in-beam target studies on a Ta bar.

  11. ISOLDE converter targets Ta-rod after irradiation with 6E18 protons in 2.4 ms pulses of 3E13 Ta-converter mounted below the UC target before irradiation

  12. Jim Morgan, Pbar Target, FNAL, is doing tests on a tantalum disc.

  13. Test of a Tantalum Disc in the FNAL PBAR Target Jim Morgan, Pat Hurh and Tony Leveling. 120 Gev proton beam with σ = 0.15 mm, 5.5x1012 ppp Energy density ~10000 Jcm-3 (Neutrino Factory: target energy density of 300-600 Jcm-3) Can melt the target in a single pulse along the beam path. Can see spallation of material - probably by shock damage Will test a beam of σ= 0.5 mm diameter into the 1 mm thick tantalum disc at a range of energy densities.

  14. PBAR Target showing damage of the stainless steel end discs

  15. 2. We are spending a small amount of money on the TT2A experiment - 1 man-month to assess design and cost of the cryogenics.

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