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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