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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 - PowerPoint PPT Presentation
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Internal H0/H- dump
Cesare Maglioni, Melanie DeloncaThanks 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
09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection
3
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
6
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
10
Transient to steady operation
09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection
11
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
12
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
14
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
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
09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection
16
Thank You
09/11/2011 C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection