HB TB2002 Some Results. Shuichi Kunori Jordan Damgov 05-Nov-2002. HB Testbeam 2002. Dates: June 26-July 1 “ECAL” // July 24-July 31 HF // Aug. 01- Sep. 18 HB Goals (HB): Demonstrate 144ch working Demonstrate DCS going
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HB TB2002Some Results
Additional Goals (left over from 1999TB)
HB Wedges (2)
Have a 7 x 7 crystal array in front of HCAL which can be moved for eta scan. Online get a usable resolution of 2.3 %.
e- 100, 20,30,50GeV
p- 300, 20,30,50GeV
Pedestal RMS distribution
In ADC count
Source scan uses QIE at 25 nsec to sum up to a D.C. current. Signal to noise is good (3 mCu). Assignment of calibration constant to tile is simple.
a bad case
ADC count (in 3x mode)
Some channels are noisier than others.
Fitted values are less sensitive to pedestal width.
Some muon points in f=3 were bad.
Besides the bad points, the muon
data show better agreement with
the source data.
00 - 31 (0 - 20GeV)
32 - 63 (17 - 119GeV)
64 - 95 (104 - 614GeV)
96 - 127 (539- 3089GeV)
Jets: 15-20GeV for top reconstruction/rejection
>3TeV for compositness & QCD
Readout: Et Threshold 500MeV
Max. E = 3TeV
Noise < 200MeV/time slice ( <0.66 LSB)
QIE(ADC): 7 bits (128 integer codes in non-linear scale)
1-10000 counts equivalent in linear scale.
3TeV at the max scale
0.9 LSB (TB2002)
Pedestal: Higher statistics for better mean value
before/after physics runs.
during abort gaps.
Optical sum of layer 0 signal with others.
1 or 2 time slices for signal extraction.
(SK Dec 2001)
20GeV parton jet @ 10E34
Lower threshold is better!
Electronics noise and occupancy define the threshold.
>> aim at 0.5GeV/tower @ 10E34
> .5 GeV
> 1 GeV
> 2 GeV
> 3 GeV
(SK June 2000)
With 17.3 min-bias events
Tower = Ecal+Hcal
>> Not much pile-up effect with this resolution!
>> Resolution gets worse as threshold increase.
>3TeV jets 2.9fb 290 events/year at 10E34.
Need to cover up to 3TeV? YES.
No synchronization between beam arrival time and QIE clock at TB.
20 time slices at TB. (5~10 at CMS)
1 time slice : 300MeV/ADC, noise=270MeV
2 time slices: 150MeV/ADC, noise=212MeV
2.5TeV ….. 1.8TeV
3.0TeV ….. 2.2TeV
4.1TeV ….. 3.0TeV
Need correction for 25ns/30ns!
HO for Muon Trigger
Analysis in progress at Tata.
TB 1996 and MC indicated ~1.5!
Wt ~ 1.0
Need real ECAL super module
to determine final weight.
Crack Scan (between wedges)
Wire chamber data useful after Run 2698.
s ~ 0.6mm
s ~ 0.5mm
Ready for gap study!
Dmean = mean(4)-mean(cap)
F = 1 2 3 4 5 6 7 8
1) Before and after physics runs.
2) During abort gaps.