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Internal H0/H- dump

Internal H0/H- dump. Cesare Maglioni, Melanie Delonca Thanks to: R . Chamizo , R . Versaci, O . Aberle, J . Borburgh. Outline. Available specs S pace & layout Loading cases Preliminary analyses : Average Ambient Dose around the dump Energy Deposition Density Instantaneous DT

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Internal H0/H- dump

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  1. Internal H0/H- dump Cesare Maglioni, Melanie Delonca Thanks to: R. Chamizo, R. Versaci, O. Aberle, J. Borburgh

  2. Outline • Available specs • Space & layout • Loading cases • Preliminary analyses : • Average Ambient Dose around the dump • Energy Deposition Density • Instantaneous DT • Transient to steady operation • Steady operation • Support / cooling proposal • Conclusions C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  3. Available specifications Chamber drawings (proposal) - 25/10/11 EDMS 1069240 31/08/10 EDMS 963395 07/10/11 + EDMS 1069244 18/06/10 EDMS 1163508 19/09/11 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  4. Space & layout EDMS 1163508 • The flange has to be adapted to the assembly / fixation / cooling needs of the dump 185-202 mm • The instrumentation has to be fixed on the dump (front face) • The dump is one-piece with the flange (ALARA, quick exchange / disassembly) C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  5. Space & layout EDMS 963395 • No differentiation between H0 and H- loads • H- impact angle: assumed ~33mrad (J. Borburgh)  t.b.c. EDMS 1069240, 44 • The whole envelope is considered for the dump only (no shielding considered) • Proposal for a supporting structure / fixation under development C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  6. Loading cases EDMS 963395 Operation: • Three loading case (following stripping efficiency): • (1) e = 98% (foil operational) • (2) e = 90% (foil degraded) • (3) e = 0% (foil accident) • 4/4 Linac4 Beam loading case (foil accident + distributor failure) -- -- -- -- • Steady-state, 2% all H0, 0.8mA • Steady-state, 10% all H0 , 4mA, 8h max • Transient 1/4 Linac4 pulse, 40mA, 100% H- (interlock after 1 pulse) • not considered C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  7. FLUKA / Average Ambient Dose around the dump “…For boron nitride and graphite, after a few days of cooling time the dose rates are of O(10)−O(102) μSv/h, according to the location around the dump. The dose rates are a factor of 3-4 times higher for aluminum nitride…” • RP / magnet : need for shielding ? • TOP view, Equivalent Rate H*(10) (μSv/h) after 1 day cooling • SIDE view, Equivalent Rate H*(10) (μSv/h) after 1 day cooling C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  8. Energy Deposition Density 3.73 J/cm3/pulse Case (1) H- beam Half dump BOTTOM view, Energy Deposition Density for loading case (3) [J/cm3/pulse] 33mrad C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  9. Instantaneous T Half dump BOTTOM view, T due to 1/4 Linac4 pulse (3) H- beam C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  10. Transient to steady operation C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  11. Transient to steady operation (2) Foil degraded (90%, 71 W) NO cooling (2) Foil degraded (90%, 71 W) Nominal cooling C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  12. Steady operation (1) Foil operational (98%, 14.2 W) (2) Foil degraded (90%, 71 W) Half dump BOTTOM view, DT due to steady-state operation • 0.5 ÷ 3 l/min for cooling depending on the fixation chosen ~ 40 mm expansion (case 2) ~ 2 mm bending (no support, no chamber) Circulating H+ beam H0 beam C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  13. Support / cooling proposal No water feed-through  water-into-vacuum leak risk Stainless Steel plate Graphite-to-Copper brazing • Demand for careful design of the vacuum flange (weakness)? C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  14. Support / cooling proposal Copper part inserted into Steel flange Graphite-to-Copper brazing Cu-Brazing Entrance for water cooling Exit for water cooling C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  15. Conclusions • The analyses have been done based on up-to-date specs : temperatures and cooling are not an issue • In case of loading (2) + of cooling failure  temperatures increase smoothly • Induced radioactivity : need for a shielding ? • Some parameters have still to be defined: • Impact angles of beam (important for H- beam in accident, vacuum chamber, etc..): 33mrad t.b.c. • Risk of scraping the circulating H+ beam, reduced width • Dump support / fixation to vacuum flange  feedback from design /vacuum needed, careful flange design C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

  16. Thank You C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

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