Internal H0/H- dump

Cesare Maglioni, Melanie DeloncaThanks to: R. Chamizo, R. Versaci,

O. Aberle, J. Borburgh

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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

09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

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Available specifications

09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

EDMS 1163508 19/09/11

EDMS 963395 07/10/11

Chamber drawings (proposal) - 25/10/11

EDMS 1069240 31/08/10

+ EDMS 1069244 18/06/10

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Space & layout

09/11/2011 C.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 1163508

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)

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Space & layout

09/11/2011 C.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 1069240, 44

EDMS 963395

• The whole envelope is considered for the dump only (no shielding considered)

• Proposal for a supporting structure / fixation under development

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Loading cases

09/11/2011 C.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 963395

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FLUKA / Average Ambient Dose around the dump

09/11/2011 C.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(102) μSv/h, according to the location around the dump. The dose rates are a factor of 3-4 times higher for aluminum nitride…”

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Energy Deposition Density

09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

Half dump BOTTOM view, Energy Deposition Density for loading case (3) [J/cm3/pulse]

3.73 J/cm3/pulseCase (1)

H- beam

33mrad

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Instantaneous T

09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

Half dump BOTTOM view, T due to 1/4

Linac4 pulse (3)

H- beam

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Transient to steady operation

09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

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Transient to steady operation

09/11/2011 C.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

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Steady operation

09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

(1) Foil operational (98%, 14.2 W)

(2) Foil degraded (90%, 71 W)

~ 40 mm expansion (case 2)

Circulating H+ beam~ 2 mm bending (no

support, no chamber)

Half dump BOTTOM view, DT due to steady-state operation

• 0.5 ÷ 3 l/min for cooling depending on the fixation chosen

H0 beam

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Support / cooling proposal

09/11/2011 C.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

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Support / cooling proposal

09/11/2011 C.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

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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

09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection

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Thank You

09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection