LBNF status

Process to chose 2 SPs

• Candidates who accepted (vote starts the 27th):

Milind Diwan Chang Kee JungSanjib MishraAndre RubbiaJim StraitMark ThomsonBob Wilson

EFIG activities

• Accepted : 1 type of cryostatsNext:– Define cavern layout– Define cryostat technology (3 options)– Define cryogenics logistics– Define infrastructure (clean room, cranes,

access, ..)

4

Alternative 1 - (4) 10 kT near RossCartoon

5

Alternative 3 – 10+30 kTCartoon

6

Cryostat size > 10 kt eff)

15 m

14m

15.1m

19 m

26 m

Length : 1+0.8+62+0.8+1+1.5+15 = 82.5 m

Width : 1+0.8+15.1+0.8+1= 18.7 = 19 m

Crown Height : 0.5+0.6+0.8+14+0.8+0.3 +9 = 26 m** Still need to be optimized

Membrane inner volume : 62.0 x 15.1 x 14 = 13’107 m3

Volume to excavate : 82.5 x 15.1 x 14 = 40’755 m3

(for simplicity we assume a flat roof, CF engineers to optimize it)

Pit dimensions:

END VIEW

Mexineen area14m

62 m

82.5 m

Mezzanine9m

Top of cryostat steel: 0.5+0.6+0.8+14+0.8+0.3 = 17 m 17 m

Cryostat type

3 solutions (all membrane cryostats):

warm vessels:- concrete wall attached to the cavern walls

- standalone concrete structure (LBNO)- standalone Fe structure (CERN)

criteria : safety, schedule, cost, who pays

Where the cryogenics

Where the cryogenics

Mexineen area14m

62 m

82.5 m

Mezzanine9m

Mexineen area14m

62 m

82.5 m

Mezzanine9m

CDR

• Discussions ongoing on the layout/structure