projectivePraxial=Proximity+Axial
In-plane
bil
bml
bol
Muon Chamber Alignment (Saclay)goal: absolute 30um on sagitta
sofar: relative movements (better 30um)
Can we contribute?ALIGNMENT=In-Plane + Praxial + Projective
BOL and NIKHEF
In-plane measures a lot.
Most relevant: TORQUE (20urad)
Can be studied inCosmic ray stand (NOW, no global geometry needed)
BISBIS
BOL (NIKHEF) 20um accurate, achieved!In-Plane x,y, scale, rotZ calibration to 20um effective (done, no direct proof)
In addition: platforms for praxial and projective aligment glued (using Saclay tools)
Datcha@NIKHEF
•Vertical alignment rays on praxial platforms
•In-Plane Torque can be measured between chamber pairs
•Projective platforms are not tested here (nor elsewhere), which limits the ‘power’ of this setup wrt alignment!!!
A quick fit• Tracking with Cosray (efficiency, resolution + many
studies needed, for example Tmax)• In-Plane (Torque) study• A few 100um check of praxial platforms + track
sagitta’s (we have some ideas….)• Basic relative movements: possible, but done
already years ago.• Get parameters out to tune ATLAS software!
If we go for more: ASAP needed
ASAP
• ROOT/C++ package• Nominal geometry:
AMDB database• New Geometry from
alignment + temp sensors
• Uses Muonbox or Moore
• Thinkable that this migrates to Athena
A ‘Quick-fit’ vs ASAP• Alignment=In-Plane+Praxial+Projective. Even with
ASAP projective is not measured. So….• ASAP is/was used in H8 Saclay responsibility.
Why do it here?• Unlogical to go for alignment software, while we
have experience with tracking reconstruction software. Get that in first.
• Why use ASAP for stand at nikhef. Do it completely independently for H8 and get prepared for ATLAS!!!
• Enough interesting stuff to do in cosmic ray stand without ASAP.
• Get parameters out to tune ATLAS alignment software. Let Saclay develop this software.
Note: this is my opinion + some statements to get discussion going
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