ECAL Aprile 2007

Roma 2-4-2007 S. Ragazzi Milano-Bicocca

ECAL Aprile 2007


Sommario

• Problema MB, e soluzione– Progresso nella integrazione e commissioning

• Risultati da test/commissioning 2006-2007– MTCC– Test beam H2– Test beam H4– Cosmici


Attività ECAL 2007

(v. MD 9/2006)• Costruzione Moduli EB Centro Regionale (fase finale)• Integrazione Super Moduli Bld27 (fase finale)• Pre-calibrazione con Cosmici ad H4 (fase finale)• Installazione e cablaggio ECAL Barrel in CMS• Commissioning ECAL• Analisi ECAL H4• Analisi dati H2 ECAL+HCAL• PREPARARSI ALLA FISICA


ECAL integration progress in 2006

• Spring ’05: first SM assembled with final MB• Dec ’05: first SM assembled with final cooling• Jan ’06: first problems appeared during MB installation• May-July ’06: bad kapton batches delivered rejected• Sept-Oct ’06: SM validation test before installation @ Point 5 detected new disconnected channels at MB level• Front-end electronics integration suspended in Oct ’06• Good health test of most of the already assembled SM• Ageing test campaign on 300 MBs• Creation of a task force• Dec ’06: IBE decided to change MBs in as many SM as possible without interfering with CMS installation schedule


MB task force

• Members of the task force:

A. Benvenuti with: A. Ball, P. Bloch, T. Camporesi, W. Lustermann, J.Nash, N. Pastrone, F. Pauss, P. Sharp,T. Virdee

Task force meetings:

October 31st, November 15th, 27th and December 7th

The first meeting was dedicated to an overview of the problem, planning of the test campaign and procurement of a new generation of kapton cables. The other meetings were basically driven by the availability of the tests results


Faults happening at the level of the connection (hand soldering) between kaptons , VFE connectors and PCB on the Motherboards

1 MotherBoard = 25 channels

1 SuperModule = 68 MBs = 1700 channels


Ageing tests

Sample of ~7500 ch spread over the whole MBs production from 4 dismounted SMs + extras

– 90 thermal cycles (-20ºC, 80ºC) Hp: > 10 LHC years operation

checks done after 20-55-90 cycles to study mortality

– chemical stress: 80h at 80ºC and 80% humidity

only on ½ sample

to verify effect of residual soldering flux and kapton anomalies


New Faults after each step

0

5

10

15

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25

1 2 3 4 5 6

Step number

Number of faults

unknownshort

solderingkapton

B867 22 ch TO

21 ch

Thermal cycles -20 to 800C: 20 55 91

B2716 ch

Channels Tested = 7850 (6750 from 4 SMs + 1100)

80h - 800C - 80% hum Channels Tested ~ 4225

B2711 ch

B27 8 ch

B272 ch


“The MB tests done in Torino before and after the thermal stress cycles indicated that some of the faults (disconnected channels), 30% before the first test and 3-4% afterwards, were actually intermittent.

Most of the faults ascribed to bad soldering occurred before the first thermal cycle suggesting that they probably broke during the removal/insertion operation.

The faults ascribed to kapton occur during the thermal stress cycles more or less at the same rate within the limited statistics.

The chemical stress test yielded only 2 faults/4225 channels

Profile analysis of 6 MB that failed the thermal stress cycles presented a pattern of defective kapton manufacturing and soldering “

A. Benvenuti @ CMS Management Board Dec 8, 2006


“The overall picture that emerges from the tests and the handling of the boards (intermittent contacts) is that the kapton cables and the soldering to the pcbs are weak spots of the MBs, that probably will deteriorate with time since cables and solder points are under stress.

The best strategy is to replace as many MBs as possible within the financial and more important the schedule constraints of CMS

Technical coordination has developed a scenario where EB is fully installed in UX, mostly in the shadow of the layout of the cooling ducts and power cables for the tracker. This allows for maximal flexibility for the refurbishing EB without macroscopic delays in the readiness for Tracker Installation.

The task force recommends that plans are made to replace the MBs in the entire EB if this proves to be consistent with the CMS

schedule” A. Benvenuti @ CMS Management Board Dec 8, 2006


New MB parameter definition

• Task force examined in detail all the possible improvement to the new production exploiting past experience:– Kapton design was mechanically improved– New tests during production were required due to

tacker experience– New assemply technique were tried

• Two new company were selected• Ageing tests of 44 new MBs OK


Schedule ( as from L. Veillet planning)

• First installation window: April 17-May8• Second installation window: may 15- June 6 (but still

discussions on start date: likely that the whole period shift by at least one week , in Austin master plan this shift is indeed implemented)

• Last MB delivered on 11 May : this is the Critical path (last bare SM delivered 3rd week of April!)


New integration area @ B867MB & cooling assembly


Old integration area @ B867front-end integration & SM commissioning


Integration status

• March 30 2007 – 18 “mibare” completed (MB and cooling only)

• 11 completed and commissioned

• 2 completed and ready for commissioning

• 3 are being integrated

• 2 waiting integration

• on schedule for finished SMs (even slightly ahead)

15 Institutes involved in the integration & commissioning


ECAL schedule

9 SMs/month

Current scheduletoday


2006: test beams+Cosmici+MTCC

H4 H4-cosmici

H2

MTCC


MTCC

Shower in ECAL

• Per ECAL principalmente un esercizio di integrazione DAQ• DCS e Data Quality Monitor (G. Della Ricca Ts) hanno funzionato bene• ECAL ha funzionato per circa 2 mesi senza problemi: noise allo stesso livello osservato in H4


MTCC

TB results confirmednoise/ch ~ 40MeV

No B-induced changes in the pedestal RMS

RMS pedestals0T-3.8T3400 ch


H2 – TB combinato ECAL+HCAL

Raccolti dati di ottima qualità:elettroni e pioni 1 – 300 GeV


H2 goals

Disponibili solo risultati preliminari: non esistevano per questi task software e algoritmi consolidati su test precedenti

20GeV beam

0 0

H2• Combined calorimetry• Electron (photon)/hadron separation with ECAL only (shape analysis etc.)• pi0 reconstruction and study of in-situ calibration with pi0• linearity studies down to 1 GeV e-


Test beam H4

• Attività coordinata con successo da Nicolò Cartiglia (TO)

• Provata l’intera catena: XDAQ, DQM, CMSSW

• 9 SM calibrati, di cui 1 x 2

H4

E anche: • Irradiation (6 Xtals)• Energy Scan & linearity (15-250 GeV, in M1, M3, M4 and as a function of eta)• Gap & cracks, corners & edges (at different energies, in several positions)• Horizontal and vertical fine scan (every 2 mm)• Gain ratio (at many energies)• Trigger primitives• Zero suppressions• Synchronous running• Muons • Xtals Monitoring and Laser operation


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SM6

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25 ns period

H4 test timeline


Test beam H4 - analisi

• alcuni tra i principali goal:– Calibrazione: precisione di intercalibrazione e riproducibilità

(resp. P.Govoni Mi)• dimostrata allo 0.2%• viene usata come riferimento per:

– misure light yeld in laboratorio– intercalibrazioni con cosmici

– Contenimento e confronto con Geant4, scan in : analisi in corso e risultati preliminari (Resp. C. Rovelli Rm)

– Linearità: risultati preliminari (Resp. N. Pastrone)


H4: intercalibration precision

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.


H4: intercalibration stability




H4 - electrons vs. LY




Test beam H4

• Provata la solidità dell’intera catena di monitoring e calibrazione:– Light yield (misura in lab, prima di montaggio)– DQM– Calibrazione cosmici (commissioninng SM)– Calibrazione con elettroni (test beam)– Laser

• Chiare relazioni quantitative tra le informazioni raccolte con le diverse procedure: fondamentali per commissioning finale di tutti i SM


Calibrazioni con raggi cosmici

• E’ la procedura di intercalibrazione adottata per tutti i supermoduli a completamento del commissioning (resp. A.Ghezzi, Mi)– APD gain x 4 (200 invece di 50) controllato con laser– progressi in:

• confronto con intercalibrazioni su fascio (notare range dinamico)

• contributo di mu che attraversano due cristalli• studio e riduzione di effetti sistematici• calibrazione di cristalli di confine modulo-modulo e di bordo

del supermodulo


• Scintillatori di trigger posizionati in modo da

massimizzare l’accettanza per puntanti

Cornice di scintillatori di tag sui bordi del SM, per

assicurare che il passi per il SM

10°

SM inclinato di 10° per aumentare il rate di puntanti a grande .

Cosmics Setup


Comparison with the test beam

Comparison of the relative calibrations to study the typical results on a SM.All the TB calibrated SMs (except SM24) are merged, to obtain the average behaviour.

M4M3

M2M1

M1 ~ 1.25 %M2 ~ 1.28 %M3 ~ 1.32 %M4 ~ 1.81 %


Comparison with the TB

index

<C

cosm

-C

beam

>

Considering the whole range and all the SMs:

=1.41 %

whole SM

All the SMsNo SM24

including SM 24=1.49% in the peak

Similar results for all the SMs

relative calibrations


Comparison with TB

Comparing the global calibration gives a figure of the accuracy obtainable from the

calibration with cosmic muons, and of the spread between SMs

=1.47 %

including SM 24=1.55% in the peak

All the SMsNo SM24

Similar results for all the SMs


Edge and intra modules crystals

Overall agreement for the combined calibration of the intra-module crystals:

M1||M2 ~ 1.5 % M2||M3 ~ 1.65 %M3||M4 ~ 2.1 %

=1.45 %

Relative calibIncluding the intra modules

All the SMsNo SM24

For the edges:•From pairs M1~2.2%, M2~2.4% , M3~ 2.7%, M4 ~4.4% •From singles

They will be combined


Cosmic calibration - summary

The average agreement of the calibration with cosmics and at the TB, over a single SM is at the level of 1.4% (1.5% including SM24)

If also the global calibration between the different SMs is taken into account the agreement is at the level of 1.5% (1.55% including SM24)

This varies from about 1.3% in M1 to about 1.8% in M4


Conclusioni• Il retrofitting delle MB procede secondo la schedule

– nessuna sorpresa– test con cosmici di moduli retrofitted dimostrano la riproducibilità

delle calibrazioni

• La campagna di test e analisi del 2006-2007 dimostra:– intercalibrazioni determinate e riprodotte allo 0.2%– robustezza della procedura di:

• misura LY in laboratorio• DQM (resp. Trieste: G.Della Ricca et al.)• monitor laser • calibrazioni cosmici

– Altri importanti risultati nella pipeline di analisi• confronto tra diverse procedure di calibrazione• linearità• confronto con Geant4• calibrazione con pi0


Conclusioni (2)

• Restava un solo problema...– la revisione della schedule per il retrofitting delle MB

comportava la quasi cancellazione dell’ importante programma di commissioning in situ (DQM, HV, laser...)

• sembra che anche questo problema ora sia risolto, ma non è una buona notizia

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ECAL Aprile 2007