ATLAS C alorimeters Phase- 1, Phase-2 upgrades Calorimeters Electronics CERN group participation

ATLAS CalorimetersPhase-1, Phase-2 upgrades

• Calorimeters• Electronics

CERN group participation

L.Hervas, PH-ADE meeting Calo upgrades 27.4.2012 1

Calorimeters

Calorimeter detectors are expected to operate correctly through all life of ATLAS and will not be changed.

Exception : upgrade of Forward calorimeter areaBeyond nominal luminosity ion build up can lead to loss of signal. This is compounded by voltage drop across HV protection resistors

located in the cryostat. Effect of this will be signal degradation at the inner edge (high η) in the

FCal Beam heating could potentially cause Liquid Argon to boil



Options under discussion: Replace FCAL with a new sFCAL

Smaller LAr gaps (250 um -> 100 um)Needs additionally new summing boards and new cooling loops

Place a Mini-FCAL in frontReduces energy and ionization in current FCAL to acceptableOptions CU-Diamonds, HP Xe, Cold Mini FCAL

All options being considered for Ph-2. Nothing in Ph-1. All have (+-) implications with the EC cryostats

Calorimeters


Opening of EC cryostats might be independently needed or not To replace HEC Preamp electronics

inside, at outer HEC radius Will depend on exact dose and safety

factors Trying to measure this precisely

If needed, would integrate also FCAL upgrade

Calorimeters

Electronics for Calorimeters All calorimeters electronics will need to be upgraded

Beyond their foreseen lifetime Beyond their foreseen radiation tolerance Triggering capabilities are degrading at higher and higher μ Current electronics limits the latency budget for L1 trigger

Full exchange of FE and BE electronics in Ph-2 for Tile & LAr Ph-1 clearly compromises ATLAS physics capability

Raise trigger thresholds for EM objects-> inacceptable


Thresholds for non isolated EM objects vs. Inst. Luminosity @ 20kHz Level-1 Trigger rate

To keep rate @ 20kHz,need to raisethreshold to 35 GeV

Electronics for Calorimeters

Use EM shower features (now used @ LVL2) to improve trigger @ LVL1: keep single e- pT~25 GeV

Need more granularity at trigger LVL1 to reject jets faking triggers Separate layer information helps (somewhat) for jets


Current Trigger (LVL1)Use 0.1×0.1 cells, Σ all depths

ProposalUse segmentation of 0.25×0.25

of MID layer generate Ratio factors



Electronics for Calorimeters Implementation :

Increase the granularity sent to trigger Tower Builder Boards (TBBs) Not build Towers any more, but transmit separate layers No more analog transmission (UX15->USA15) but “super-cell” digitization on

FE (SCDBs) Keep analog system for Tile, as backup for LAr

Receive samples @ ~ROD like device (DPS), transform into Et, ΣEt... Transmit those quantities to trigger processor (eFEX, jFEX) with sliding window

algorithms



Constraints :Needs to be compatible with rest of system No FEB exchanges, only change partial sums (on mezzanine boards) More signals to route: new baseplanes at FE crates Keep total latency compatible with current L1 (2.5 μs)

Should be used in Ph-2


Electronics for Calorimeters Should be used in Ph-2



Effort to introduce changes in adiabatic way Keep Analog TBBs, cables, L1Calo preprocessor, processor….

Install a demonstrator system in LS1 (~1Φ wedge) : Modify one FE crate with new baseplane Prototype SCDB, prototype DPS Readout new trigger primitives, compare with standard L1Calo and with readout

In LS2 install new SCDBs boards in the FE, long fibers, New DPS boards in the BE In LS3 full replacement of FE and BE RODs


1212

FE crate

FE Boards

TBB

LVPS

Trigger cables

L.Hervas, PH-ADE meeting Calo upgrades 27.4.2012

E.g. Barrel and Std EMEC


Slot #“Easy” case1 empty slot

Needs SCDB to treat284 channels

(PS: 30; Front: 112; Middle: 112; Back: 30)

New baseplane

Tile plans No possibility to exchange all electronics and drawers for Ph-1 Mandatory for Ph-2 Current R&D program explores several options


Tile plans


Tile plans


Tile plans


Tile plans


CERN groups participation LAr

Electronics coordination System tests @ SR1 EMF

Demonstrate new boards do not degrade current systemDemonstrate performance of new approach before installing on ATLASStart preparing system 2nd half of 2012

Installation in ATLAS, CommissioningDemonstrator in 1st half 2014

Tile Tests of 3 approaches @ setup in B175 Demonstrate performance of new approach Installation in ATLAS, Commissioning

1st Demonstrator in 1st half 2014

Both systems need support at the level of Fellow DOCT Subsistences

Tile & LAr: Normally small CERN participation for deliverables


Documents

ATLAS C alorimeters Phase- 1, Phase-2 upgrades Calorimeters Electronics CERN group participation