csn1, 14 maggio 2007 calorimetria em a lar di atlas 1 eca barrel ecc

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 1

Calorimetria EM a LAr di ATLAS

ECA

Barrel ECC


Detector Status Barrel:

Cold and filled with Lar. In stable conditions since June 06

Endcap A (ECA): Cold and filled with Lar.

In stable conditions since mid March 07

Endcap C (ECC): Cool down started on

March 22 and should be finished by the beginning of June

ECA cool- down

80,00

100,00

120,00

140,00

160,00

180,00

200,00

220,00

240,00

260,00

280,00

300,00

Tem

pera

ture

(K)

Minimum detector temperatureMaximum detector temperature

ECA filling

0

10

20

30

40

50

60

70

cryo

stat

lev

el (

%)

He contact gas, circulation of gaseous N2 in heat exchangers

He contact gas, circulation of liquid N2 in heat exchangers

Purging of He gas, introduction of Ar gas in cold tank

Last part of cool down: Ar contact gas, liquid N2 circulating in heat exchangers

ECC Cool- down Temperature

80.00

100.00

120.00

140.00

160.00

180.00

200.00

220.00

240.00

260.00

280.00

300.00

29/0

3/2

007

05/0

4/2

007

12/0

4/2

007

19/0

4/2

007

26/0

4/2

007

03/0

5/2

007

10/0

5/2

007

Date

Tem

pera

ture

(K)

Minimum detector temperature read on the cryo system

Maximum detector temperature read on the cryo system

Last updated 07-05-2007

Start cool down 22/03/07


Detector Status Lots of debugging going on on the systems:

Noise studies, electronic calibration, signal reconstruction,…

Cosmic runs with Tile trigger: Barrel: first data taking period in August 06 and

October 06. Now systematically (~every weekend) since March 07

ECA: taking combined data (ECA+Barrel+Tile) since Easter

Cosmic run is being proving a great opportunity to drive developments in DCS, DAQ, Monitoring, Reconstruction, Electronics Calibration, conditions DB,…

Strong Milano involvement on HV activity and especially on DCS software


HV DCS Barrel and Presampler calorimeters HV

DCS are partly integrated into the ATLAS DCS: Full integration expected before M3 week

(June 4-18) Complete barrel integration and then

move to endcap calorimeters: FSM: barrel only so far Condition DB: barrel only so far Configuration DB: to be done Alerts: to be done


HV status Due to limited availability of HV power supplies only a subset of

the detector can be powered Barrel:

Barrel EM: 1.6 kV on 12/32 modules (cosmic set-up) since begin of March 07

Barrel Presampler: 2000 V on 32/64 modules

Endcap A: EM:

At nominal voltage since end of April Hadronic:

At nominal voltage since beginning of April. Temporarily OFF to debug HV/LV interlock for safety of HEC preamps

Forward:At nominal voltage since beginning of April

Endcap C: EM:

Partial 50 V during cool down


HV status Two old problems:

1. Failures of Iseg HV modules2. Shorts in some calorimeter sectors

1. Failures of Iseg modules:

Solved. The problem has been identified and Iseg is retrofitting all modules bought by the Collaboration (136/151)

Retrofitting: 75% done (of 114 which need retrofitting). Should be finished by Mid June.

40 “new generation” modules ordered: 15 to complete set-up (end August) + spares (end 2007-beginning 2008).

Prototypes being delivered: to be tested at CERN, Dresden and Milano before starting production

Retrofitted modules are continuously ON since beginning March (April) for Barrel (ECA) cosmic runs with good performance


HV status2. Shorts in the calorimeter:

Since the first cold tests in B180, some HV sectors have been found in short

Two approaches to cure the shorts (Barrel EM, Barrel PS, EM Endcap):

“short burning”: send a fast large spike in the faulty HV line to burn the resistive impurity causing the short cut

“hospitalization” (if the above fails): since the “short” has usually a resistance in the ~1 Mregion (few hundreds k in worst cases), the affected channel can be put on special high current modules where they can operated drawing currents (up to 3 mA) at reduced voltage (if needed)


Shorts in calorimeter Barrel Presampler:

All channel OK at nominal voltage after “burning” procedure Barrel EM:

Burning tried beginning of July: unsuccessfull 23/896 lines on high current modules 12/23 lines operated drawing current at nominal or reduced voltage

since beginning of March (cosmic set-up) Affected sectors can be operated successfully, currents are pretty

stable Endcap EM A:

27 lines in shorts during first ramp up after cool down Short burning: 16/27 lines cured Remaining 11 lines will be put on high current modules (modules

ordered) All the other lines OK at nominal voltages


LV Power Supplies 58 (Barrel+Endcaps) DC-DC

converters located on the cryostats: 280 V DC input, 4.5 kW per box,

rad tol Several problems found during

production: Weak design and construction,

thermal problems, deterioration of components

Only 12 PS available for cosmic run so far

After a deep re-evaluation of the design the Collaboration decided to retrofit all 68 units: Each unit has 27 module: 20

components/module to be replaced

Job assigned to ALGEN Design Services Inc


LV PS After an initial delay,

retrofitting is now well on going and retrofitted modules are getting at CERN: 23 done, 16 already at

CERN (2 on Barrel replacing old ones, 7 on ECA)

OK so far: 2 PS ON for about 2 weeks

Retrofitting will be completed by late July

However it is only a temporary solution (2 yrs): Because of time and

component availability not all desidered changed could be integrated

Two new companies identified to start a new design/prototyping phases: Wiener Algen+AEI

Decision for production will be taken after the prototype phase

Line of Balance - Production

37

1115

18

23

0

10

20

30

40

50

60

70

80

3/30 4/6 4/13 4/20 4/27 5/4 5/11 5/18 5/25 6/1 6/8 6/15 6/22 6/29 7/6 7/13 7/20 7/27 8/3

Baseline Production Critical Production Actual Production Equivalent of Side-A completion Equivalent of Detector completion


SW activities Calibration activities:

Calibration of photons and electrons “Calibration hits” methods, will be available in release

13 Work on going to demonstrate if it can also be used in

Etmiss calibration Etmiss calibration:

Overall performance (CSC note: D. Cavalli co-conv):

Hadronic calibration workshop held in Milano 26-27 april 07

Physics analyses: H->analysis (CSC note: L. Carminati co-convener) A/H-> (CSC note: S. Resconi co-convener)

Additional Slides


Richieste Finanziarie Missioni Italiane ed Estere: Integrazione MI, ME

Marcello Mazzanti e’ in pensione dal settembre 2006,

era stato cancellato, dal 1 ° gennaio 07 e’ associato senior.

- successivamente integrazione missioni estere sulla base delle

necessita’ ( per 2007: proposti 132 keur, finanziati 92.5 )

Capitolo Consumo - Sblocco s j 40 Keur (M&O 56 Kfr CH + cong.) 2007


M&O ATLAS LAr 2007

Piano di spesa (K CHF) :

2006 2007 2008 2009 2010

750 1170 1285 1285 1285

Nel 2007 per LAr non ci sono piu’ C&I e CC.

L’incremento nel 2007 rispetto al 2006, risente del rimborso di 350 KCHF per “spares “ (elettronica di FE), gia’ da tempo programmato.

La prima valutazione dei costi M&O per il 2007 ( maggio 06) e’ stata ridotta del ~ 14 %, per tener conto della nuova schedula di LHC.

le cifre relative agli anni 2008 2010 sono oggi superate !!


2007 M&O Sharing


CORE %

M&O SparesFE

Totale(KCHF)

INFN(Milano)

4.8 39.4 16.8 56

La riga che riguarda l’INFN (Milano) e’:

Calorimetria EM a LAr di ATLAS

Meccanica 5 Acquisti/Lavoraz. meccanic. , saldature…..

Impianti Gas 1 Affitto bombole e racks

Sist. Criogenici 30 Manten. sist. Crio., gas x tests, slow control

Sist. Cooling 30 Coolling PS, FE crates, mantenim., upgrades

Elettronica 160 Strumentaz per laboratori, affitto pool, RO, manuten., upgrades

Contr. DCS,DSS 30 Componenti per ELMBs, sensori, sniffers

PS(LV,HV) 200 Manutenzione, upgrades

Magazzino 50 Componenti meccanici, elettrici, etc…

Gestione Aree 30 Trasporti,logistica, pulizia aree sperim.

Comunicazioni 4 Telefoni portatili, videoconferenze

Manpower 280 Personale tecnico,ingegn. esterno/gruppi

Elettronica FE 350 Spares, rimborso

Totale 1170 kCHF

M&O Voci di Spesa 2007


Ricercatori : D. Banfi (Dottorando, 100%) L. Carminati (Ass. Uni., 100%) D. Cavalli (Dir. Ric., 100%) G. Costa (Dir. Ric., 100%) M. Fanti (Ric. Uni., 100%) L. Mandelli (PO, 100%) L. Perini (PO, 100%) S. Resconi (art. 23, 0 %) F. Tartarelli ( Ric., 100%)

Tecnologi: M. Citterio ( Tec., 50.%)

Totale: 8 Ricercatori, 2 Tecnologi→ ( 8.5 FTE )

Tecnici: B.Monticelli (100%), F.Alberti (50

%)- Servizio Elettronica ( 8mu)

Coordinatrice WG Jet, t e PTmiss Perf.

Responsabile ATLAS Italia

LAr Electronic Coordinator

Responsabile locale

Composizione del Gruppo


Richieste Finanziarie 2007 Missioni interne 1. K€ x8.5 +3 resp. naz. 11.5 K€

Missioni Estere Meetings etc. 8.5 x 1.5= 12.8 mux 4.4 K€ 56.1 Integraz. Responsabilita’ 3 x 4.4 K€ 13.2 Commissioning HV 2p x 12w → 6X4.4 K€ 26.4 ____Totale mesi uomo :21.8 mu Totale 95.7 K€

Missioni Est. per gestione app.+ shifts LAr /ATLAS - 07) (*) assumendo 1.5 FTE/y (18 mesi uomo) 79.2 K€ Consumi

Metabolismo (1.5 K€x8.5) 12.8 K€ M+O (2007) 56 KFrCH 37.3 K€

Programma R&D SLHC ( SiGe) (se approvato) 30. K€

(*) E’ solo una valutazione preliminare !! Totale 266.5 K€ ( criterio di “sharing” non ancora definito in ATLAS ).


Barrel• Pressure variations in expansion vessel: ± 4 mbar;

• Temperature variations (in time) in liquid argon (as measured by DCS): < 20 mK; (Tmin 88.2 K, Tmax 88.6 K)

• Running on “lost” nitrogen (losses too small to run with refrigerator)

• Impurity level measured with four purity cells: (0.20 +- 0.05) ppm O2 Stable in time !

expansion vessel pressure

1,2

1,22

1,24

1,26

1,28

1,3

8.6.06 0:00 10.6.060:00

12.6.060:00

14.6.060:00

16.6.060:00

18.6.060:00

20.6.060:00

22.6.060:00

date

arg

on

pre

ssu

re (

bar

a)


‘OR’ of top modules

EBC LBC

EBC LBC

LBA

LBA

EBA

EBA

5 6 7 8 ‘OR’ of bottom modules

4 new boards from LAr

1 2 3 4

‘AND’ top - bottom

4 boards from Tile


March 2007 HV = 1.6 kV

August 2006 (13k evts) 2. 0 kV

October 2006 (78k evts) 1.6 kV


Some starting studies:

Uniformity of response by P.S. Mangeard (old runs)

η

No

rma

lize

d

Mu

on

Re

spo

nse

S2 cell depthdata

normalized to 1

Muon energy deposited in LAr by M.CookeOptimizing clustering algorithm

• follows expectations

Error bar per point is ~2 % in average (1% around =0.4 and 3% at borders)


subdetector allr=retrofitted

o=old hc=high current

EMB+SP

EMB-PS

HEC+ Pur

EMEC EMEC-PS+ Pur-N

FCAL Hospital barrel

Hospitalend-caps

NeededTotal 151 + 6hc 32+3 16 32+1 48 4+1 14 2 4

CERN orderSUNNY orderTotal order

1363

139

sacrificed(cleaning/epoxy)

- 5

new piggy + 2

totalproduced

136 + 2hc 72 44 6 14 2 ordered

in operationUSA15 racks just arrived at

CERNto be repaired

77r + 2o +15 + 2hc

39r +2o 38r 3 12 2

7r+1 6r 1r 1

1r 1r

to be retrofittedas of today done

still to be retrofitted

11486r28

7046r24

4440r

4

at CERNat ISEG

at TU-Dresdenat PROTVINO

SUM=

103 + 2hc30

12

136 + 2hc

4824

72

394

1r

44

41

16

121

114

2hc

2hc

ordered


HV sectors The calorimeter has a large HV granularity and the impact of

HV failures is limited In the Barrel EM there are 448 HV sectors; each HV sector is

x=0.2x0.2 (2‰) and biased by 2 lines, each one providing HV to a set of 32 semigaps of LAr

If one line fails a reduced signal is seen that can be corrected offline

No dead zones (holes)


LAr Cosmic Run: 600 V region Most of the “short” > 1 M

< 1 mA at 1000 V -> <1 W dissipation. reduced acceptance loss to x = 0.075x0.025 (or 0.05) wrt x =

0.2x0.2 the effect should be quite similar to a dead

middle cell ... but lower signal-to-noise ratio due to 20%

reduction of signal Detection of in the region with lower rate but no dead region

Signal is observed with ~30 % longer drift time

Signal in 1600 V region Signal in 600 V region


Linee di lavoro:

• Validazione software, formati e tools di analisi. • Messa a punto di un framework comune di lavoro in previsione dei primi dati

• Studio e ottimizzazione della risoluzione del picco di massa dell’Higgs:• calibrazione dei fotoni, ricostruzione del vertice primario, conversioni…)

• Fondo riducibile: studio e ottimizzazione dei “fake jets” in collaborazione con e/gamma performance groups

• Fondo irriducibile: studio di tool statistici per ottimizzare l’estrazione del

segnale sul fondo irriducibile.

• EDITORS: L. Carminati (Milano), B. Mellado (Wisconsin)

• GRUPPI COINVOLTI: Annecy(France), CERN, Milano(Italy), Montreal (Canada), Orsay, Paris (France), SMU(US), Wisconsin (US)

• ORGANIZZAZIONE: lavoro incominciato nell’autunno 2006,

Nota CSC H


CSC EtMiss Overall Performance Note

• Editors: D. Cavalli, A. Gupta, Italian contributors: C. Pizio, S. Resconi

1) Introduction

2) The Cell-based method

* Etmiss reconstruction (Noise suppression )

* Etmiss calibration (H1-calibration, LocalHadronCalibration, Refined calibration a la TDR)

* Evaluation of Performance: resolution, linearity, tails

* measurement of Etmiss direction

3) Object-based method

4) Fake Etmiss dedicated studies * Fake Etmiss sources ( jets pointing to cracks,

losses in dead materials,...) * Beam-halo, beam-gas, cavern background

effects * Instrumental effects (noisy/hot/dead cells

(regions) in calorimeters * Etmiss significance5) Etmiss in Atlfast6) Etmiss in early data * resolution in minimum bias events * Etmiss scale from Z to tau-tau event * W-->l-nu events * W+jets events7) Summary and conclusions

CSC (Computer System Challenge) Simulazione MC – detector as built-as

installed-with misallignements Produzione di 20Mevts in corso Testare la catena completa del

computing Produzione, distribuzione, analisi dati Produrre CSC note che

documentano la Performance del rivelatore

Potenzialita’ nello studio dei canali di fisica


• Introduction:

• Importance of the channel (experimentally and theoretically)

• Previous studies (TDR and after)

• MSSM H/A Production and Cross-sections

• Montecarlo (PHYTIA + SHERPA)

• Experimental setup

• Detector requirements:

• Tau reco and id:

• Electron reconstruction

• Muon reconstruction

• EtMiss reco and calib:

• jet rec, calib and b-tagging

CSC Note HG7 : H°/A°

• For each one of the 3 final decay modes

(lep-had, had-had, lep-lep):

• Event selection

• data carachteristics

• Analysis

• Results

• Systematic uncertainties

• Trigger

• Combine the results from

the 3 decay-modes :

• Discovery curve in the (mA, tanbeta) plane

• Summary and conclusions

• Acknowledgments, References, Appendices: Technical Aspects

• Editors: M. Heldmann, S. Resconi, Italian contributors: D. Cavalli


Calibrazione elettromagnetica : ‘first principles based calibration’

• La calibrazione elettromagnetica attuale e’ basata su coefficienti estratti con una procedura di minimizzazione. • CONS: Non e’ possibile fattorizzare le correzioni e I pesi longitudinali non correggono esattamente per l’effetto

• PRO: Performance accettabili e metodo semplice

• E’ stato sviluppato un metodo di calibrazione alternativo alla minimizzazione e basato su speciali simulazioni con accesso alle energie depositate anche nei materiali inattivi/passivi del rivelatore

• PRO: Disaccoppiare e capire le correzioni (materiale in fronte, leakage longitudinale…), correggere ogni singolo effetto con una correzione opportuna.• CONS: il metodo e’ piu’ complesso e sono richiesti piu’ parametri.

• Lo studio del metodo e’ terminato ed e’ stato implementato dentro il software ufficiale di ricostruzione di ATLAS:

• Studi e confronti dettagliati verranno effettuati tra i metodi anche nell’ambito del CDC

Banfi,Carminati,Mandelli


Photons Resolution (/E), All E

Cra

ck B

arr

el-

Endca

p

PS NO PS• 25 GeV• 50 GeV• 75 GeV• 100 GeV• 200 GeV• 500 GeV


Photons Linearity, All Energies

Cra

ck B

arr

el-

Endca

p



Electron Energy Resolution (/E), All Energies

Cra

ck B

arr

el-

Endca

p

PS No PS

Cra

ck B

arr

el-

EndC

ap

• 25 GeV• 50 GeV• 75 GeV• 100 GeV• 200 GeV• 500 GeV


Electrons Linearity, All Energies

Cra

ck B

arr

el-

Endca

p


csn1, 14 maggio 2007 calorimetria em a lar di atlas 1 eca barrel ecc

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