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