1. News from Integration WG
V. Mertens
F. Valchkova-Georgieva
IOWG

2. Tunnel concept and FCC-hh cross section
Various concepts and dimensions studied.
Presently focusing design on
Single tunnel
Personnel/equipment protection through
Fire compartments every ca. 400 m
Under-floor air supply duct
Overhead smoke/He extraction
Automatically operated fire doors,
air supply flaps, smoke extraction
Need for supplementary safety features
(mitigation measures) to be evaluated:
(Pre-)fire detection
Automatic fire-fighting
Personnel protective equiment (PPE)
...
Subject to results of ongoing risk assessment
preliminary

3. Basic demands/design features
Main design input:
Dipole OD 1.50 m across reinforcement rings
Dipole weight 70 t cold mass + 12 t cryostat
QRL OD 1.20 across bellows/compensators
Maintainability of cryogenic valves etc.
Rational installation using main vehicle
Minimum margin towards installed eqpt.
70 cm space to bypass vehicle
Ideally
Flat floor
Exploitation of under-floor space
 6 m tunnel
Need for various services:
Ducts (fresh air supply, extraction)
Pipes (firefighting, raw, demineralised water)
Drain water (scaled from LHC by sector length)
He return, N2/Air lines
Communication, lighting, alarms, AUG, ...
Cable trays for power and controls, SC link, power transmission

4. Features Smoke/He extraction Demineralized water Survey TIM SC link
Radiating cable
HV transmission
RIA
Warm He recovery
First aid eqpt.
Water filling
Compressed air
Electrical box He
Transport
vehicle
Raw water/firefighting
Fresh air duct
Drain

5. Fire compartments/doors
Quasi-hermetic enclosure of the tunnel/elements
every ca. 400 m, at convenient long. positions
Automatic fire door 2 x 3 m
Door status/operability
regularly tested
permanently monitored (obstacles)
Doors can be operated by persons
evacuating from the danger zone.
Persons assumed to be „safe“ as soon
as covered by 2 doors (buffer zone).
Evacuation (over max 10 km) supported
by mechanical transport means
(individual or collective)
In affected zone:
fresh air supply, smoke/He extraction, firefighting means deployed from safety control room, then locally by firefighters
preliminary

6. Alcoves
Every ca. 1.5 km to lodge transformer, MV/LV switchgear, UPS, orbit corr. PCs, controls, HVAC, ...
Dimensioned to contain 20 % more equiment than in LHC
Radiation chicane (incl. mobile part, enabling equipment passage) – details under study
Fire protection door
False floor for cable passage, drain connection, ...
Combined with interconnect of HV transmission cable ??

7. Alcoves transformer MV to LV switchgear CV equipment User racks
UPS and secure
systems
preliminary

8. Normal access shafts
One shaft per access point (also at experiments), ca m Ø
Double lift system, 3 t each, travel time as in LHC (ca. 1 min., also in deep shafts)
Pressurised housing for lifts and emergency staircase, connection lifts-staircase every ca. 11 m
Installation of ducts, pipes and cables via movable scaffolding
Number and dimensions of ducts, pipes and cable trays as per user demand
Trémie of 8 x 4 m for equipment lowering
preliminary

9. Access shafts with magnet lowering
Round or elliptical; cost difference to be evaluated (PMI2 is elliptical)
Presently reserving 18 x 2.5 m for magnets (incl. covers, handling margin)

10. Access shafts with magnet lowering
Very soon to be drawn up as reference:
Cross sections
Alcoves
Access shafts
To be worked on thereafter:
Magnet model w support
Next detector caverns
Underground structures
FCC-ee

11. Detector caverns and shafts
Detector caverns for FCC-hh LxWxH = 70x30x35 m.
2 shafts per experiment, Ø 15 and 10 m
(to access the other side of the detector once in place)
Positions, services to route through still to be defined

12. Underground structures
Sketch shows only design principles („starting point“) for shafts, access paths and waiting zone.
Details to be worked out (over several floors, to scale and in 3D).
Service gallery to englobe experimental requirements (LxWxH = 100x20x15 m).
PLUS machine requirements (electricity, cryogenics, water systems, air handling, controls,
transport vehicles, buffer zones for radioactive equipment, firefighting gear, ...).
30 cm iron shielding between detector magnet and electronics in service cavern