ATLAS plans for a forward detector at `210m

D.Macina, M.Nessi, G.Spigo

ATLAS plans a small angle scattering experiment in the forward region, capable to do physics at high luminosity (AFP)

Main requirements

• 2 detector stations, 7-10m far a part• Detectors going as near as possible to the

beam (10-15 sigmas?)• Detectors retractable in a garage position• Concept of an insertable beam pipe (Hamburg

beam pipe concept)Thin windows: ~ 250-300 mumDimensions:

height ~ 15-20mm window length ~ 22mm

floor length ~100 and 700mm

Material austenitic steel (306 LN)

Components :

• Hamburg pipes with thin windows• Displacement bellows• Beam position monitors• Secondary vacuum chamber hosting

the detectors• Moveable support table• Vacuum infrastructure• Positing motors infrastructure and

controls• Detectors and services

Next steps• Demonstrate on a prototype the thin window beam pipe concept and

performance (summer 2012)• Design the final layout (chambers, secondary vacuum, bellows, movements,

table, feedthroughs,…) by October 2012• Clarify collimators (new TCL6) by July 2012• Study beam optics and all aspect related to the LHC operation, vacuum, beam

impedance, e-cloud, heating and safety by July 2012, coordinated by M.Galillee

• December 2012 write TDR and get it approved by LHCC• Feb 2013 get LMC approval• Feb 2013 start Hamburg beam pipe construction• Feb 2014 install it in the beam line and test performances in situ • May 2014 install first detectors prototypes• 2016 detectors fully installed (during extended shutdowns) and operational