1 possible setup for the h8 test beam f.cerutti pintroduction: from h8 phase i to the system test...
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Possible setup for the H8 test beamPossible setup for the H8 test beam
F.CeruttiF.Cerutti
Introduction: from H8 Phase I to the system test
Possible setup in 2002-2003: Magnets on the H8 beam
Conclusions
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Credits: Many thanks to
Claude Guyot Jean-Francois La Porte Ludovico Pontecorvo Ilias Efthymiopoulos Sandro Palestini Jim Bensinger Joe Rothberg Christoph Amelung Alexander Schricker William Andreazza Gilbert Poulard
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Introduction: from H8 phase I to system test
H8 PhaseI is on the way - ingredients that will be tested:– DCS on alignment devices and temperature sensors– Sensor calibration and databases– Alignment reconstruction and simulation software– Test of the EC alignment without tracks
H8 PhaseII still to be defined - ingredients that will be tested:– DAQ– MDT electronics– DCS on HV/LV, gas system– Chamber calibration– Patter recognition and track reconstruction on straight
tracks– Test of the EC alignment with straight tracks
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Introduction: from H8 phase I to system test
Complete system test in 2002-2003 ?– Final goal: Operate 1 Barrel and 1 EC sector with the
“same” (as closest as possible) software/hardware as in ATLAS
– Benefit: have a working muon spectrometer from the very beginning
Additional Ingredients:– Final DAQ (selective readout of MDT chambers)– Trigger chambers (with electronics)– DCS reading of magnetic field probes– Pattern recognition and reconstruction of bent tracks– Complete muon spectrometer simulation (G4)
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Minimal Setup expected in 2001 Barrel (see Ludovico’s talk) End-cap (more details in Jim’s and Joe’s talks)
– 6 alignment bars with polar, azimuthal, radial, in-bar, and temperature sensors
– DCS working on alignment devices– Alignment reconstruction (and simulation) software– Alignment (including sensor calibration) database – Phantom chambers with muon simulator
Program of H8 Pase I:– Stability tests of the EC alignment devices – Relative tests of the EC alignment with controlled movement
of one bar – Relative test of the EC alignment with the muon simulator– Absolute test of the EC alignment using redundancy
Integration aspects between: DCS on alignment devices, alignment database, alignment calibration and reconstruction
Installation of 3 equipped EC chambers in September ???
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Setup expected in 2002
Barrel (see Ludovico’s talk) End-cap (more information in the all the following talks)
– 6 chambers (EIL1, EIS1, EML2, EMS2, EOL3, EOS3) equipped with gas system, Faraday cage, electronics, in-plane and proximity alignment (precisely mounted)
– DCS working on alignment, gas control, HV, LV– DAQ-1– Simulation of the H8 test beam with GEANT4
Program of H8 Phase II:– Reconstruction of straight tracks– Absolute test of the EC alignment with straight tracks– Calibration of the EC alignment system with straight tracks
Integration aspects between: DAQ, DCS on gas system, DCS on HV/LV, chamber calibration, MDT databases, track reconstruction, alignment reconstruction, test beam simulation
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Towards a more complete system test in 2002-2003
System tests aspect to be studied after H8 Phase II EC:
– Trigger system and its integration with DAQ and track reconstruction
– MDT selective readout based on trigger chamber signals
– DCS reading of Hall probes
– Reconstruction of non straight tracks
Proposal for 2002-03 H8 test beam setup: Add bending magnets in the H8 beam
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Magnets in H8 beam
Barrel: 1 Dipole in front of the Barrel stand Goals:
– Irradiate both chambers in each plane to test the ch-ch praxial alignment concept (never tested on real data !)
– Perform MDT auto-calibration
Requirements:– Angular spread similar to the one obtained for the ATLAS
interactions (cannot be achieved with defocused beam)
– About 60 mrad needed for auto-calibration (see ATLAS-MU 196 P.Creti et al.)
– Same spread also good for alignment tests (C.Guyot)
– Minimal rates ~104 particles per run needed for alignment tests (100 m/104 ~ 1 m)
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Magnets in H8 beam
End-cap: 1 dipole between the EI and the EM stations: Goal:
– Reconstruct bent tracks using measured magnetic field map
– Measure the magnetic field in the dipole
Requirements:– Get bent tracks with sagittas ~ few mm-cm
– Put Hall probes in the dipole (Hall probes from B0 test available in 2002 - C.Guyot)
– Get rates ~104 tracks per run
H8 beam:– With 2ry beam particles with 10<p<400 GeV/c available– Reasonable rates down to P~10-20 GeV:
(200-1000) particles/spill -> (1-5)x105 particles in ~3h but for a limited amount of time (constraints on H6 beam)
– 3ry beam fluxes to be checked, easier availability – P/P ~1% beam spread can be achieved
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For 20 GeV
MCB ~64 mr ~4° (aperture 64 mrad)
MBPL ~60 mr ~3° (aperture 150 mrad)
For 10 GeV
MCB ~130 mr ~8° but > aperture 64 mrad
MBPL ~120 mr ~7° (aperture 150 mrad)
For 20 GeV
MCB ~64 mr ~4° (aperture 64 mrad)
MBPL ~60 mr ~3° (aperture 150 mrad)
For 10 GeV
MCB ~130 mr ~8° but > aperture 64 mrad
MBPL ~120 mr ~7° (aperture 150 mrad)
Dipole magnets available at CERN
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Magnets in H8: Barrel dipole
Possible setup for the Barrel stand
For P<50 GeV the beam doesn’t hit EOL3 in EC ! EOL2 and EOL4 should be installed if we want to take useful data in EC stand
For P<30 GeV the beam is deflected outside the beam-dump (at this rates this should not a problem)
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EO
statio
n
beam
deflectio
ns:
64 m
rad B
arrle
64 m
rad E
C
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Magnets in H8: EC stand
For the EC with the MCB magnet reasonable sagittas are obtained for P ~ 20-150 GeV muons:
Since P of the beam can be fixed at the 1% (or probably better) if we change B -> [ BL)]: good relative check of the muon spectrometer P measurement
For 20 GeV
MCB ~64 mrad s~780mm
For 150 GeV
MCB ~9 mrad s~120mm
For 20 GeV
MCB ~64 mrad s~780mm
For 150 GeV
MCB ~9 mrad s~120mm
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Conclusions
2002-2003 could be a very interesting period for H8 test beam activities
The goal of the H8 test beam in 2002-2003 goes well beyond simple test of the alignment systems
The introduction of bending magnets can help the Barrel alignment test (and auto-calibration) and the test of the reconstruction of non straight tracks in the EC
To have a complete system test a large effort from the muon collaboration is needed: muon chambers, trigger chambers, electronics, DAQ, DCS, gas system, HV/LV, simulation, track reconstruction, alignment reconstruction, databases
In the following talks interest / availability / manpower / resources about all this items will be discussed
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