Update on ECAL status

Update on ECAL status

Irina Machikhiliyan, 22.06.2011

New reference point: fill 1799

17552/5/11

18557/6/11

Time, minutes.One point per run

Red: physics runsBlack: the rest

Average relative PmToPin change with respect to 1st run (fill 1755)

Fill 1799 –start of more-or-less regular physics data

taking after series of MD/tech. stops.

Will be used as reference for later fills


Fills 1799 - 1883Time, minutes.One point per run


#92035 1799

21/5/11

#939951883

21/6/11FILL 1883: only several first runs




Fills 1799 – 1883, Inner


#93995 1883

21/6/11


#92035 1799

21/5/11



Fills 1799 – 1883, Middle


#93995 1883

21/6/11


#92035 1799

21/5/11



Fills 1799 – 1883, Outer


#93995 1883

21/6/11


#92035 1799

21/5/11



run #93995 (fill 1855) wrt run #92035(fill 1799)

PmToPin(93995) /PmToPin(92035)

PmToPin(93995)/PmToPin(92035),Inner: mean 0.943 rms 2.9%

PmToPin(93995) /PmToPin(92035),Middle: mean 0.962 rms 3.7%

PmToPin(93995) /PmToPin(92035),Outer: mean 0.959 rms 3.3%

PmToPin(93995) /PmToPin(92035),All: mean 0.956 rms 3.5%

Signal change per fill vs Lumi fills 1748-1875

Red / blue entries: addition to plot shown 25/05 (fills 1805-1875)

Fill 1868


Fill 1871Fill 1867

Fill 1867: L=8803 nb-1; LastToFirst=0.994Fill 1868: L=17967 nb-1; LastToFirst=0.989Fill 1871: L=8911 nb-1; LastToFirst=0.991

Signal change per fill vs Lumi, fills 1748-1875 (cont)

Inner: up to 1.6% Middle: up to 1.%

Outer: up to 0.9%Irina Machikhiliyan, 22.06.2011

Gradual decrease of average PMT/PIN with respect to the reference point (up to 6.5% in case of Inner section, 5% in average for the whole detector). It seems that the typical period between two consecutive fills is too short for the noticeable recuperation.

Main contribution comes from the rad. damage of Monitoring system fibers (at least in the Outer section)

Signal relative change over the fill seems depending on delivered luminosity (not the duration of the fill), up to

1.6% change at present conditions (Inner section), 1.1% in average for the whole detector.

Impressions: fills 1799 - 1883


<Q>vs R

Net charge through PMTs according to the integrators,1 Mar – 21 Jun

Black: C, topRed: C, bottomGreen A, topBlue: A, bottomQ vs R

R, cmR, cm

Location of integrators on ECAL surface, ¼ of ECAL


Consumptions from MV,22 Mar – 21 Jun

C-side A-side

Looks like further decrease of net consumption

I, A I, A

t, sec t, sec


Two measurements of MV consumptions individually per each half of the detector section (no beam, no LED flashing):

1 Jun 5 Jun C-side A-side C-side A-side Inner 0.3097A 0.309A 0.3072A 0.3063A Middle 0.3238A 0.323A 0.3238A 0.3234A Outer 0.5285A 0.5299A 0.5288A 0.5301 A

Only Inner section seems to be affected [?for a moment?], measurements are to be repeated on the regular basis

Overall consumption from MV (no beam, no LED flashing): 1.1599 A / side (5 Jun) instead of 1.186 A / side (beginning of 2011)

Individual consumptions for sections



First measurement: 30 Apr, CALO logbook entry http://lblogbook.cern.ch/CALO/1577

Second measurement: 1 Jun, CALO logbook entry http://lblogbook.cern.ch/CALO/1623

Consumption per C-W, via small groups of cells, various location on detector


Central Inner cells: systematic shift down. Black and red dots: 30 Apr, green and blue: 1 Jun, line: fit over 3 first points. The dependencies are still linear.

Outer cells: consumptions did not change at all

C-side A-side

Consumption per C-W, via small groups of cells, various location on detector (cont)

Connector #1 (crate 14/slot08) <f> = 64.8 kHz Connector #2 (crate 13 /slot18) <f> = 65.5 kHz Connector #3 (crate 08/ slot18) <f> = 68.94 kHz Connector #4 (crate 09/slot09) <f> = 68.97 kHz

Next steps Check regularly the values of MV-consumption for each half of the

section Next tech. stop: re-measure C-W pumping frequencies (initial

measurement – 10 May, see logbook entry http://lblogbook.cern.ch/CALO/1587)


Update on ECAL status

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