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

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 09/11/20112C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection

Available specifications 09/11/20113C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection EDMS /09/11 EDMS /10/11 Chamber drawings (proposal) - 25/10/11 EDMS /08/10 + EDMS /06/10

Space & layout 09/11/20114C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection The flange has to be adapted to the assembly / fixation / cooling needs of the dump EDMS mm The instrumentation has to be fixed on the dump (front face) The dump is one-piece with the flange (ALARA, quick exchange / disassembly)

Space & layout 09/11/20115C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection No differentiation between H0 and H- loads H- impact angle: assumed ~33mrad (J. Borburgh)  t.b.c. EDMS , 44 EDMS The whole envelope is considered for the dump only (no shielding considered) Proposal for a supporting structure / fixation under development

Loading cases 09/11/20116C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection 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 EDMS

FLUKA / Average Ambient Dose around the dump 09/11/20117C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection TOP view, Equivalent Rate H*(10) (μSv/h) after 1 day cooling SIDE view, Equivalent Rate H*(10) (μSv/h) after 1 day cooling RP / magnet : need for shielding ? “…For boron nitride and graphite, after a few days of cooling time the dose rates are of O(10)−O(10 2 ) μSv/h, according to the location around the dump. The dose rates are a factor of 3-4 times higher for aluminum nitride…”

Energy Deposition Density 09/11/20118C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection Half dump BOTTOM view, Energy Deposition Density for loading case (3) [J/cm 3 /pulse] 3.73 J/cm 3 /pulse Case (1) H- beam 33mrad

Instantaneous T 09/11/20119C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection Half dump BOTTOM view, T due to 1/4 Linac4 pulse (3) H- beam

Transient to steady operation 09/11/201110C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection

Transient to steady operation 09/11/201111C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection (2) Foil degraded (90%, 71 W) Nominal cooling (2) Foil degraded (90%, 71 W) NO cooling

Steady operation 09/11/201112C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection (1) Foil operational (98%, 14.2 W) (2) Foil degraded (90%, 71 W) ~ 40  m expansion (case 2) Circulating H+ beam ~ 2  m bending (no support, no chamber) Half dump BOTTOM view,  T due to steady-state operation 0.5 ÷ 3 l/min for cooling depending on the fixation chosen H 0 beam

Support / cooling proposal 09/11/201113C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection Demand for careful design of the vacuum flange (weakness)? No water feed-through  water-into-vacuum leak risk Graphite-to-Copper brazing Stainless Steel plate

Support / cooling proposal 09/11/201114C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection Entrance for water cooling Exit for water cooling Graphite-to-Copper brazing Cu-Brazing Copper part inserted into Steel flange

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 09/11/201115C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection

Thank You 09/11/201116C.Maglioni, M.Delonca - Review on PSB 160 MeV H - Injection