HCAL TB2002 Resuts @ CPT Week, CERN, 05-Nov-2002, S.Kunori 1

HB TB2002HB TB2002Some ResultsSome Results

HB TB2002HB TB2002Some ResultsSome Results

Shuichi Kunori

Jordan Damgov

05-Nov-2002

HCAL TB2002 Resuts @ CPT Week, CERN, 05-Nov-2002, S.Kunori 2

HB Testbeam 2002HB Testbeam 2002HB Testbeam 2002HB 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 • Source data vs GeV/ADC (beam: e / / / p)• Muon signal in HO for muon trigger• Eta dependence (attenuation)• Eta dependence (timing)• Pulse shape (needs TDC)• Weight in Layer 0start construction of Calibration Database

Additional Goals (left over from 1999TB)• Crack between wedges• e/pi (resolution and linearity)• Cerenkov light in clear fibers

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HCAL+”ECAL” LayoutHCAL+”ECAL” LayoutHCAL+”ECAL” LayoutHCAL+”ECAL” Layout

Calibrate 4 wedges ’02. Check HO response as tail catcher and as muon trigger element. In ’03 use PPP to study 40 MHz beam and HE/HB transition region.

HCAL TB2002 Resuts @ CPT Week, CERN, 05-Nov-2002, S.Kunori 4

Testbeam LayoutTestbeam LayoutTestbeam LayoutTestbeam Layout

H2 beam

ECAL(49 crystals)

HB Wedges (2)(144 channels)

HO(16 channels)

MovingTable

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““ECAL”ECAL”““ECAL”ECAL”

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 %.

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HB 2 Wedges - 16HB 2 Wedges - 16 x 8 x 8HB 2 Wedges - 16HB 2 Wedges - 16 x 8 x 8

300GeV -

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Prototype HTR , DCCPrototype HTR , DCCPrototype HTR , DCCPrototype HTR , DCC

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Test Beam Results: DataTest Beam Results: DataTest Beam Results: DataTest Beam Results: Data

- 225GeVe- 100, 20,30,50GeV- 300, 20,30,50GeV

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Data and SoftwareData and SoftwareData and SoftwareData and Software

Data Files• ROOT format• All files (~300GB) are in the tape robots at CERN and Fermilab.

Software for Analyses• HTBDAQ_data

• http://flywheel.princeton.edu/~jmmans/HTBDAQ_data/• Provides data access methods to DAQ root files

• Simple C++/root scripts to analyze data.• e.g. wire source analysis

• H2Reco• http://home.fnal.gov/~jdamgov/h2reco/

• Reads DAQ root file using HTBDAQ_data.• Construct higher level objects, e.g. 1x1, 3x3, 5x5 ECAL or HCAL clusters

in addition to raw ECAL and HCAL data, etc.• Writes output root files

• V11 was used for quick data validation during September runs.• Many data sets have been processed through v11d at Fermilab.

• V12 will be released soon. It includes calibration constants from the wire source data for September data runs.

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Pedestals

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Noise LevelNoise LevelNoise LevelNoise LevelPedestal RMS distribution

In ADC count

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Wire Source Scan

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.

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Source Histograms by HTRSource Histograms by HTRSource Histograms by HTRSource Histograms by HTR

a bad case

ADC count (in 3x mode)

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Wire SourceWire SourceWire SourceWire Source

Some channels are noisier than others.

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Gaussian Fit to y projectionGaussian Fit to y projectionGaussian Fit to y projectionGaussian Fit to y projection

Fitted values are less sensitive to pedestal width.

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Source vs Beam DataSource vs Beam DataSource vs Beam DataSource vs Beam Data

5%

e- -

Some muon points in =3 were bad.Besides the bad points, the muondata show better agreement withthe source data.

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ADC GeV

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7 bits ADC7 bits ADC7 bits ADC7 bits ADC

ADC Codes

00 - 31 (0 - 20GeV)

32 - 63 (17 - 119GeV)

64 - 95 (104 - 614GeV)

96 - 127 (539- 3089GeV)

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Dynamic RangeDynamic RangeDynamic RangeDynamic Range

Original Requirement: 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.

300MeV LSB 3TeV at the max scale

Pedestal: Higher statistics for better mean value before/after physics runs. during abort gaps.

Energy extraction: Optical sum of layer 0 signal with others. 1 or 2 time slices for signal extraction.

ResolutionEnergy offsetOccupancy

0.9 LSB (TB2002)

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Effect of ThresholdEffect of Thresholdon low Eon low ETT jet and MET jet and METEffect of ThresholdEffect of Threshold

on low Eon low ETT jet and MET jet and MET

Electronics noise and occupancy define the threshold.>> aim at 0.5GeV/tower @ 10E34

Lower threshold is better! (S.Nikitenko)

20GeV parton jet @ 10E34 MET

(I.Vardanian)

(SK Dec 2001)

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MET for Signal Events with MET for Signal Events with Pile-up and Tower ThresholdPile-up and Tower ThresholdMET for Signal Events with MET for Signal Events with

Pile-up and Tower ThresholdPile-up and Tower Threshold

RMS35 GeV 37 GeV

42 GeV 44 GeV

> .5 GeV > 1 GeV

> 2 GeV > 3 GeV

36 GeV

> 1GeV

With 17.3 min-bias events No min-bias

Tower = Ecal+Hcal

GeV

>> Not much pile-up effect with this resolution!>> Resolution gets worse as threshold increase.

(SK June 2000)

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E in single HCAL readoutE in single HCAL readoutE in single HCAL readoutE in single HCAL readout

>3TeV jets 2.9fb 290 events/year at 10E34.

Fraction of events above E threshold (%)

QCD bins MC evts

1.5TeV 2.0TeV 2.5TeV 3.0TeV 3.5TeV 4.0TeV

80-120 1000 1.40 0.60 0.30 0.00 0.00 0.00

2600-3000

2000 16.65 3.55 0.70 0.20 0.05 0.00

3000-3500

2000 28.85 7.40 1.75 0.30 0.10 0.05

3500-4000

2000 46.05 18.15 5.70 0.90 0.15 0.00

4500-5500

50 64.0 46.00 20.00 6.00 4.00 0.00

Need to cover up to 3TeV? YES.(J.Damgov)

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Signal in Time SlicesSignal in Time SlicesSignal in Time SlicesSignal in Time Slices

20 time slices at TB. (5~10 at CMS)

No synchronization between beam arrival time and QIE clock at TB.

(Rohf)

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GeV/ADCGeV/ADCGeV/ADCGeV/ADC

60MeV ~ 240MeV / 1 ADC count

0.6TeV ~ 2.4TeV / Full range (1 time slice) 1.2TeV ~ 4.8TeV / Full range (2 time slices)

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HPD Quantum EfficiencyHPD Quantum EfficiencyHPD Quantum EfficiencyHPD Quantum Efficiency

x

xxxx

HPD QE520

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Adjust HPD GainAdjust HPD GainAdjust HPD GainAdjust HPD Gain

For 3TeV 1 time slice : 300MeV/ADC, noise=270MeV 2 time slices: 150MeV/ADC, noise=212MeV 200 280 250 350

1. Change HV2. Lower gain HPD in HE

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Eta dependenceattenuation

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Variation in etaVariation in etaVariation in etaVariation in eta

Eta 1/attenuation

1 12 0.9473 0.9474 0.9185 0.9046 0.8877 0.8478 0.8629 0.83110 0.82511 0.78612 0.75613 0.76914 0.73015 0.61816 0.605

2.5TeV ….. 1.8TeV3.0TeV ….. 2.2TeV4.1TeV ….. 3.0TeV

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Pulse Shape

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Pulse Shape SimulationPulse Shape SimulationPulse Shape SimulationPulse Shape Simulation(S.Abdullin)

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Scope MeasurementScope MeasurementScope MeasurementScope Measurement(Elias/Rohf)

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225

Ei/E

all

ti-tave

300

20

e100

e20

Need correction for 25ns/30ns!(Damgov)

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Eta dependencetiming

Coming soon.

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HO for Muon Trigger

Analysis in progress at Tata.

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Layer 0

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Layer 0Layer 0Layer 0Layer 0

Goal: 1. Overweight 1.5 or 3.0?2. Demonstrate how to implement.

Wt ~ 1.0 Implemented! (de Barbaro)

TB 1996 and MC indicated ~1.5!

Need real ECAL super module to determine final weight.

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Crack Scan (between wedges)

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Wire ChamberWire ChamberWire ChamberWire ChamberWire chamber data useful after Run 2698.

(R.Vidal)

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W1-W2W1-W2W1-W2W1-W2

x y

~ 0.6mm ~ 0.5mm

Ready for gap study!

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Crack/Tower Scans for HCALCrack/Tower Scans for HCALCrack/Tower Scans for HCALCrack/Tower Scans for HCAL

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ConclusionConclusionConclusionConclusion

QIE dynamic range.• Not much head room for different input (HPD) gain.

• Need to control input gian by changing HPD HV?

QIE calibration• Need to calibrate pedestal and gain (full range) for each CapID.

Source calibration• Need to calculate constants for each CapID (and then average

over 4 CapID)• May require higher statistics (because of 4 caps and noise).

TB data analysis.• Extract results for all defined goals.

• Finish by March 2003, and publish.

TB 2003• New goals are suggested.

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Additional

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Wire Source DataWire Source DataWire Source DataWire Source Data

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Peds

R337818Sep02

mean = mean(4)-mean(cap)

rms (cap)

mean(4)

= 1 2 3 4 5 6 7 8(J.Dagmov)

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Peds

R8069Aug02

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Source/LED-Laser/BeamSource/LED-Laser/BeamSource/LED-Laser/BeamSource/LED-Laser/Beam

Ratio of Phi towers

0.500.700.901.101.301.501.701.902.102.30

0 2 4 6 8 10

PHI

Ra

tio

pi-

e+

mu-

LED W 1,2

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HB TB 2003 HB TB 2003 (my suggestion / PRS)(my suggestion / PRS)

HB TB 2003 HB TB 2003 (my suggestion / PRS)(my suggestion / PRS)

Goal:• Local synchronization. (time in all channels.) • Operation of full calibration system, including laser.• Emulation of pedestal estimates (4 caps) in the LHC

environment. 1) Before and after physics runs. 2) During abort gaps.• Remote monitoring and analysis.

Preparation: (addition to tasks obvious to get the goal)• Before the TB period

• HPD calibration (all) – QE• QIE calibration (all) – gain in full range for each CapID• Source calibration

• E-log book.