R&D muoni
Stato dell’arte
• Il gruppo ha appena cominciato il lavoro
– Prospettiva: preparazione workshop
• Definizione temi del workshop
• Analisi stato dell’arte
– Si vorrebbe proseguire con WG successivamente
Lavoro preliminare
• Dalla presentazione di M. Abbrescia
• Definizione degli argomenti:
– New running conditions and new requirements
from physics, consequences for muon detection
– System longevity, upgrades foreseen,new
detectors and R&D
– Electronics (front-end and trigger),trigger
algorithms, alignment
Theme (talk) #1
• New running conditions and new requirements from physics,
consequences for muon detection
• focus on muon detectors requirements from operating
conditions after LS2 and the HL-LHC physics program
– final integrated luminosity and accumulated radiation, increased
instantaneous luminosity, pile-up, etc.
– predictions for correlated (beam-induced) and uncorrelated
(cavern) background
– consequences for detector functioning, required time
resolution, and off-line track reconstruction
– adequacy or deficiencies of the existing systems performance
(extrapolated), and potential improvements
– new/better signal/track reconstruction algorithms possible with
improved detectors
M. Abbrescia
Muon System Preparatory Group
4
Theme #2 – one or two talks
• System longevity, upgrades foreseen, new detectors and
relative R&D
• System longevity of the muon systems (talk 2a?)
– Muon detector problems after LS2, actions to keep the
performance stable, possible improvements using new
detectors
– Chambers reaching rate limits, high occupancy, high dead time;
– Chambers aging due to radiation or accumulated charge
• Upgrades with new detectors (talk 2b?)
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Replacing old detectors by new ones
Extending muon system coverage with new detectors
R&D for new detector types (including MPGD)
Experimental facilities needed for this R&D
M. Abbrescia
Muon System Preparatory Group
5
Theme #3
• Electronics (front-end and trigger), alignment
• effect of increased radiation and higher collision rates
on front-end electronics and trigger systems
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radiation damage, single-event upsets
readout electronics bandwidth limitations
electronics upgrades
trigger performance, sharpness of trigger threshold, purity
hitting maximum allowed trigger rates
increasing the complexity of low-level trigger algorithms –
requiring increased trigger latency
– alignment – optical systems and alignment-using-tracks
– radiation damage to sensor electronics
M. Abbrescia
Muon System Preparatory Group
6
ATLAS
• Conseguenze dei nuovi parametri operativi
– Rate del presente trigger di m ~140 kHz
– Rate altissimi nella small wheel (~15 kHz/cm2)
– Frequenti buffer overflow nell’elettronica degli MDT
• Piani di ATLAS
– NSW installata per fase 1
• Progettata per essere utilizzata anche per HL-LHC
– Rifacimento del trigger di livello 0/1
• Latenza piu’ lunga e diversa struttura del trigger
• Implica il rifacimento di gran parte dell’elettronica
– Sia delle camere di trigger che di quelle di precisione
– Trigger con MDT?
CMS
• Due possibili stategie
– Mantenere la presente accettanza
• Difficile mantenere le performance attuali
• Problemi dovuti all’aumento di rate ed alle limitazioni in
termini di rate trigger
– Incrementare la copertura in avanti per i m
• Fino ad h = 4.0
• Nuove tecnologie considerate
– GEM, MPGD, iRPC
– Possibili nuove idee (imaging calorimeter with µ tagging)
Sinergie attuali e possibili
• PRIN proposti
– Micromegas e GEM
• ATLAS, CMS, Compass
– RPC
• ATLAS, CMS, ALICE
• Proposta preliminare per Call CSN 5
– RPC e DT, in fase di definizione
• CMS, ATLAS, ALICE
Micromega
• TDR NSW in fase di approvazione
• Attivita’ troppo avanzata per Call CSN5
– Inizio della costruzione
– PRIN attualmente in discussione
• Capofila Paolo Bagnaia
• L’attivita’ comprende ATLAS, CMS, Compass
• RPC e trigger upgrade
– Slides di Giulio Aielli e Riccardo Vari
RPC upgrade plans
• Phase 0
– Installation of the BME/BOE chambers
– Include some R&D and innovation concerning the gas gap and the
FE electronics
• Phase 1
– It has been proposed an RPC system to cover the transition region
trigger
– To be installed in the BIS7-BIS8 region
– Due to the small available space and the higher background an
R&D project has been started in continuity with the BME/BOE work
– This system if confirmed is scheduled for installation in 2018.
– Awaiting ATLAS endorsement to apply to funding agencies
– Proposed by Roma2, Bologna, MPI. Interest from Roma1, Michigan
and USTC
Phase 2 RPC plans
• In phase 2 the barrel will withstand a rate much higher than the design
value so both the trigger and the detector will need to enhance
performance
– In the LOI we proposed to profit from the trigger electronics replacement
to introduce a TOT based readout. The idea is to improve the special
resolution to a few mm, allowing a sharper 20 GeV muon threshold. This
will be done without modifying the existing chambers (which is anyway
impossible…)
– However the present RPC system will need an increased redundancy with
respect to the 3/4 +1/2 majority scheme to be able to operate to a slightly
lower efficiency on the old system
– We propose to extend the concept of the BIS type chambers (developed
for the transition region), to the full inner barrel.
• This will require a strong R&D to:
– Finalize the new RPC readout chip
– Study an eco-friendly and (possibly) inexpensive gas mixture, following the
CERN pressing requirements
– Improve the detector mechanical structure to exploit the few centimeter
thickness available space
– Improve the detector materials for very long term operation
Importante per il rivelatore attuale!!!!
NSW trigger concept
sTGC PAD trigger logic
Trigger con le micromega
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