Internal H0/H- dump
description
Transcript of Internal H0/H- dump
Internal H0/H- dump
M. Delonca, C. MaglioniOn behalf of EN/STIThanks to: A. Christov, S. Mathot, C. Pasquino, A. Patapenka
2
Outline• Issues to be addressed (from last follow-up)• Loading cases (remember)• FOMS and choice of material(s) • Methods of fixation• Space & layout • Preliminary analyses :
– Instantaneous DT– Transient to steady operation– Steady operation
• Does the dump need active cooling ?• Conclusions and next steps
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection 20/03/2012
3
From last follow-up
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection 20/03/2012
4
Loading cases
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
------
--
20/03/2012
5C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection
Copper part inserted into Steel flange
Methods of fixation
20/03/2012
• Metallization + Brazing • Shrinking
For both solution:- Copper part inserted into Steel flange
6
FOMS and choice of material(s)
– Thermal: – Structural: – RP (simplified)– Vacuum: porosity
– Electrical Conductivity: < but not too small– Weld-ability: depend on method of fixation
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection
Ceramic material
To b
e m
inim
ized
20/03/2012
7
FOMS and choice of material(s)
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection
Note: Boron Nitride and Aluminum Nitride as from first study (EDMS 1073028)
First test with Al300: possible to be welded to copper (already used at CERN)
20/03/2012
1.010.88
1.341.47 1.44 1.50
1.35
2.58
FOMS summary: to minimizeBoron Nitride Boron CarbideAlumina (Al2O3) Aluminum nitrideAl300 (97.6 % of Al2O3) Silicon NitrideSilicon Carbide Graphite
Which is an acceptable value ?Alternative solutions ?
8
Space & layout
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
• The instrumentation has to be fixed on the dump (front face)
• The dump is one-piece with the flange (ALARA, quick exchange / disassembly)
20/03/2012
Area to be modified for the cooling/bake-out of the dump, possibly no feed-through
185-202 mm
1
11068
6657
6764
8492
Stopping Range (mm)Boron Nitride Boron Carbide Alumina (Al2O3) Aluminum nitride
Al300 (97.6 % of Al2O3) Silicon Nitride Silicon Carbide Graphite
9
Instantaneous DT – Al300
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection
Half dump BOTTOM view, T due to 1/4
Linac4 pulse (3)
20/03/2012
Case 3
H- beam
33mrad
10
Instantaneous eq. Stassi – Al300
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection
Half dump BOTTOM view, T due to 1/4
Linac4 pulse (3)
Limit in tension: 184 Mpa Safety factor tension: 6.3 Limit in compression: 1840 Mpa Safety factor compression: 2.3
20/03/2012
Case 3Fixed support from the back
H- beam
33mrad
11
Steady operation – Al300
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection
~ 40 mm expansion (case 2)
Circulating H+ beam
Half dump BOTTOM view, DT due to steady-state operation
H0 beam
20/03/2012
Cooling due to radiation ONLY with Ambient – not conservative
Case 1
Case 2
Temperature on back-flange
12
Transient to steady operation
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection 20/03/2012
0 1 2 3 4 5 6 7 8 90
50
100
150
200
250
300
Case 1
case 2
Seady State Case 1
Steady State Case 2
Time (h)
ΔT (K
)
Steady State considering radiation only with ambient – not conservative
13
Does it need active cooling?
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection 20/03/2012
• First analysis with no active cooling show good results BUT– Radiation exchange with the ceramic chamber
↗ Steady state temperature in dump
– Conduction between Cu insert and Steel flange Does the temperature in the back-flange
stay within acceptable values?
Detailed analyses are required.
14
Conclusions and next steps
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection 20/03/2012
• New material configurations are under study: Ceramic dump:
reduction of the dump length (avoid the risk of scraping of the H+ beam)Lower degasing / no (or less) baking required wrt Graphitepossibility of brazing on Copper/Steel insert (for dump support) – better in case of active cooling possible only with some ceramics, analysis ongoinglow electrical conductivity : the H+ beam continuously charge the dump (H0 H+ from instrumentation on entrance face) electrical discharge through vacuum? To be studied
• Need of active cooling system to be detailed• Beam instrumentation integration to be taken into account
15
Thank You
C.Maglioni, M.Delonca - Review on PSB 160 MeV H- Injection 20/03/2012