ECAL Aprile 2007
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
Sommario
• Problema MB, e soluzione
– Progresso nella integrazione e commissioning
• Risultati da test/commissioning 2006-2007
–
–
–
–
MTCC
Test beam H2
Test beam H4
Cosmici
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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,
Sharp,T. Virdee
P.
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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 =
1700Roma
channels
2-4-2007
S. Ragazzi Milano-Bicocca
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
Channels Tested = 7850
(6750 from 4 SMs + 1100)
New Faults after each step
25
B867
Number of faults
22 ch
unknown
short
soldering
kapton
TO
21 ch
20
B27
16 ch
B27
15
11 ch
10
B27
8 ch
5
80h - 800C - 80% hum
Channels
B27
Tested ~ 4225
2 ch
0
1
2
3
4
5
6
Step number
Thermal cycles -20 to 800C:
Roma 2-4-2007
20
55
91
S. Ragazzi Milano-Bicocca
“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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
“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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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!)
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
New integration area @ B867
MB & cooling assembly
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
Old integration area @ B867
front-end integration & SM commissioning
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
ECAL schedule
9 SMs/month
today
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
Current
schedule
2006: test beams+Cosmici+MTCC
H4
H4-cosmici
H2
MTCC
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
MTCC
• 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
Shower in ECAL
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
MTCC
No B-induced changes
in the pedestal RMS
DRMS pedestals
0T-3.8T
3400 ch
TB results confirmed
noise/ch ~ 40MeV
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
H2 – TB combinato ECAL+HCAL
Raccolti dati di ottima qualità:
elettroni e pioni 1 – 300 GeV
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
H2 goals
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-
0
0
20GeV beam
Disponibili solo risultati preliminari: non esistevano per questi task
software e algoritmi consolidati su test precedenti
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
Test beam H4
H4
• Attività coordinata con successo da
Nicolò Cartiglia (TO)
• Provata l’intera catena: XDAQ, DQM,
CMSSW
• 9 SM calibrati, di cui 1 x 2
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
H4 test timeline
August
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
1
3
1
4
SM22
1
5
1
6
1
7
1
8
1
9
SM18
2
0
2
1
2
2
2
3
2
4
SM16
2
5
2
3
4
5
6
2
3
4
5
7
8
9
1
0
1
1
1
2
1
3
1
4
1
5
SM25
1
6
1
7
1
8
1
9
SM22
6
2
8
2
9
3
0
3
1
25 ns period
October
1
2
7
SM17
September
1
2
6
7
2
0
2
1
2
2
SM24
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
0
SM12 SM13
8
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
0
3
1
8
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
0
3
1
SM6
November
1
2
3
4
5
6
7
SM6
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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)
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
H4: intercalibration precision
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
H4: intercalibration stability
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
H4 - electrons vs. LY
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
Cosmics Setup
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
.
• Scintillatori di trigger posizionati in modo da
Roma 2-4-2007
massimizzare l’accettanza per  puntanti
S. Ragazzi Milano-Bicocca
Comparison with the test beam
M1
M2
M3
M4
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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.
M1 ~ 1.25 %
M2 ~ 1.28 %
M3 ~ 1.32 %
M4 ~ 1.81 %
Comparison with the TB
whole SM
<Ccosm -Cbeam>
All the SMs
No SM24
Considering the
whole  range
and all the SMs:
=1.41 %
relative
calibrations
including SM 24
=1.49% in the
peak
Similar results for all the SMs
 index
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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
All the SMs
No SM24
=1.47 %
including SM 24
=1.55% in the
peak
Similar results for
all the SMs
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
Edge and intra modules crystals
Overall agreement for the combined calibration of the
intra-module crystals:
All the SMs
No SM24
M1||M2 ~ 1.5 %
M2||M3 ~ 1.65 %
M3||M4 ~ 2.1 %
For the edges:
•From pairs
•From singles
Roma 2-4-2007
Relative calib
Including the
intra modules
=1.45 %
M1~2.2%, M2~2.4% , M3~ 2.7%, M4 ~4.4%
S. Ragazzi Milano-Bicocca
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca
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
Roma 2-4-2007
S. Ragazzi Milano-Bicocca