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Table of contents - Indico
LAR PHASE-I UPGRADE
F. Tartarelli, 05/09/2013)
Stato del TDR
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Full draft circulated to LAr and
ATLAS readers last week
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Table of contents:
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2
ATL-COM-LARG-2013-026
ATLAS circulation yesterday
(4/9)
Then to LHCC
Overview of the Phase-I LAr
upgrade project
Physics Requirements, Expected
Performance
Overview of the Existing Readout
and Trigger System
Front End Electronics
Back End Electronics
Project Organization and
Milestones
Summary
F. Tartarelli
05/September/2013
Motivations
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The goal is to maintain the rates of single and multi-object Level-1
calorimeter triggers at acceptable levels, for thresholds comparable
to those used in Run 1, despite the increased center-of-mass energy,
instantaneous luminosity up to L = 3x1034 cm-2 s-1and pile-up up to
<m> = 80.
Improve the performance of the Level-1 single object triggers based
on the calorimeter information by:
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Reducing jet backgrounds in the Level-1 EM trigger by deploying shower
shape algorithms and high-precision isolation criteria for electron and
photon identification.
Deploy algorithms currently used in the High-Level Trigger to improve t
identification at Level-1 (energy in the core of the cluster, isolation,...)
Improve the Level-1 jet and MET resolutions and efficiencies to effectively
reduce the rates for the same physics acceptance in the offline analyses.
Sharpening turn-on curves using
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3
more advanced reconstruction algorithms at Level-1
utilizing pileup subtraction techniques on an event-by-event basis as currently
implemented in the offline analyses
F. Tartarelli
05/September/2013
Expected performances
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These performance improvements introduced are possible thanks to the following
upgrades:
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4
Higher granularity in eta: The calorimeter segmentation available in the Level-1 trigger is
made finer using Super Cells: groups of calorimeter cells are summed together in the frontend electronics to form areas as narrow as DhxDf=0.025x0.1 in the front and middle
layers of the EM calorimeters.
Layer information: The longitudinal shower information - Super Cells in the electromagnetic
calorimeter only contain one layer each - will also become available for the Level-1
trigger decision.
Finer quantization scale: The digitization precision of the Super Cell signals is improved by
at least a factor of 4: the quantization scale and the dynamic range of the digitizers are
optimized in each –region and for each longitudinal segmentation of the calorimeters to
achieve sensitivities at the level of Super Cell electronic noise or better. This improved
precision is relative to a 1 GeV least significant bit of the existing Level-1 system (32 MeV
strips, 125 MeV middle)
Improved energy reconstruction: The energy deposited in the calorimeter Super Cells is
calculated at each bunch crossing through optimized algorithms: techniques similar to the
optimal filtering currently implemented in the LAr Readout Drivers provide results close to
the energy resolution obtained from the offline reconstruction.
[L1CALO] Global feature extractor: possibility to use global event quantities (correction
for pile-up)
F. Tartarelli
05/September/2013
EM Trigger
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variables tested: Rη, wη,2, f3
Optimized sets of cuts for 2 and 3-variables found and applied to
MinBias, Zee and Hγγ samples Profit from higher granularity and
finer quantization scale
5
F. Tartarelli
05/September/2013
EM Trigger
7 GeV
95% electron eff.
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95% electron eff.
.
pT > 40GeV
6
pT > 40GeV
F. Tartarelli
pT > 20GeV
05/September/2013
Milano Interests
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During the last year we
have developed interest
for the:
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Draft table with list of
Institutes and area of
interests to appear in the
TDR
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7
FEC crate new baseplanes
New solution for the
powering of the new
trigger board (LTDB)
This table does not imply
financial commitment
Cost sharing still under
discussion
F. Tartarelli
05/September/2013
Baseplanes
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A new baseplane is required
for the Phase-I upgrades to
handle the larger number of
signals at the input of the
Tower Builder.
The channel density in the new
baseplanes is feasible but will
require attention at the design
level to preserve signal
integrity and keep low noise
levels.
Design now well advanced:
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8
Ready to submit the drawings
to the company for the
production of a prototype
F. Tartarelli
05/September/2013
DC powering
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During Phase-I operation, the LTDBs will need to draw their power from the
existing LVPS (recently replaced). The current power consumption amounts
to less than 75% of the nominal power these supplies can deliver (3.2 kW),
so sufficient power reserve for LTDB operation is available.
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Since the new LTDB will have to operate after the Phase-II upgrade, the
design of the power scheme will have to take into account this forward
compatibility.
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Modular design is being considered so that the power module could be
replaced during the Phase-II upgrade to accommodate the voltage rails from a
new low voltage power supply for the FECs.
1 or 4 (LTDB modularity) mezzanine card
Workplan:
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9
power will need to be drawn from voltage lines where current is available
generate the new voltages needed with the available lines using POL and LDO
Design of the power distribution scheme for the full board;
Design and construction of the power mezzanine board;
Choice of the components (POL and LDO) between custom devices (designed by
CERN) and commercial solutions;
Systems tests at CERN;
F. Tartarelli
05/September/2013
DC powering: choice of components
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POL converters from CERN, and commercial devices as the
one already identified in the APOLLO project (Linear
Technology, Texas Instruments,…) will be investigated.
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CERN is developing POLs for the tracker upgrade. It needs to be
tested if these devices would fit also the LAr requirements
they would need to be reengineered as the package is too big for
the LTDB.
 Not enough power: need to put more than one
 Rad-had version is not available yet.
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Candidates for the LDO regulators are devices produced by
ST
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10
The Linear Technology (LTM4619 family) devices have been
tested for radiation by some of our colleagues from US; the TI
one (TPS50601-SP) is said to be rad-hard by the company. In
both case further investigations will be needed.
ST4913, ST7913: already used in the past
being evaluated by CERN for radiation-hardness.
F. Tartarelli
05/September/2013
Richieste finanziarie
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Tetto di 300 kCHF per la nostra partecipazione a questo upgrade
Stime dei costi:
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Abbiamo proposto alla collaborazione Lar di rinunciare alla
produzione dei baseplanes EC-SP e concentrarsi sul powering della
LTDB:
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Ultimare il design del baseplane
produzione uno (o due) prototipi
Test e validazione del design.
Contemporaneamente abbiamo cominciato a studiare il design del
powering della LTDB:
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11
292 kCHF + 8 kCHF contingency
Vorremmo comunque terminare il lavoro sui baseplanes:
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Produzione 8 baseplanes EC-SP: 75 kCHF
DC powering della LTDB: 292 kCHF
Primo design di massima
Produzione di un prototipo della scheda
F. Tartarelli
05/September/2013
Total cost
12
F. Tartarelli
05/September/2013
Starting dates of productions
13
F. Tartarelli
05/September/2013
Richieste finanziarie 2013

Vorremmo chiedere lo sblocco dei 5 keuro sj di R&D:
per produrre un prototipo del baseplane EC-SP di cui
stiamo ultimando il design.
 stiamo lavorando dall’inizio dell’anno a questo design e
anche se non potremo produrre in futuro tutti i baseplane di
questo tipo crediamo che sia importante non sprecare
l’investimento fatto.
 la nostra intenzione e’ di produrre uno o due campioni del
baseplane, assemblarne uno, testarlo e documentare in un
report finale i risultati del test, fornendo anche il
“fabrication file” (in formato Gerber RS-274X).
 in questa maniera, la collaborazione usera’ il nostro layout.
 inoltre validiamo un ulteriore produttore col quale
confrontare i risultati dei test che saranno fatti sui prototipi
del baseplane barrel che i colleghi francesi produrranno a
breve.
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14
F. Tartarelli
05/September/2013
Richieste finanziarie 2014
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Chiediamo 10 keuro per le seguenti attivita’ di R&D:
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15
Test del baseplane: abbiamo gia’ la strumentazione in casa per
effettuare le misure ma abbiamo bisogno di un adattatore per il
cable tester e di costruire una scheda dummy per testare i vari
slot del baseplane.
Produzione e relative assemblaggio di un prototipo della
mezzanine di distribuzione potenza della LTDB.
Acquisto DC-DC converters in package BGA e altri component
della scheda
Preparazione di un test set-up con dummy LTDB per effettuare
misure sulla mezzanine
Adattatore per il Power Analyzer AGILENT per effettuare misure
di assorbimento corrente sulla scheda
Effettueremo test di noise, EMI (al CERN), in campo magnetico al
LASA e se possibile anche test di radiazioni.
F. Tartarelli
05/September/2013
16
Back up
F. Tartarelli
05/September/2013
Draft project time line
17
F. Tartarelli
05/September/2013
18
F. Tartarelli
05/September/2013
tau
19
F. Tartarelli
05/September/2013
jet
20
F. Tartarelli
05/September/2013
New FEXs
designed and
built by L1Calo
 TDAQ TDR
New or modified
components
in red  LAr TDR
Proposed phase I
upgrade fully
compatible
with plans for
phase II
upgrade
21
F. Tartarelli
05/September/2013
Fly UP