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Test Beam @ X5/GIF:Status Report
Manuela CirilliManuela Cirilli
Pavia, 30 settembre 2002 Manuela Cirilli X5/2
X5/GIF Test Beam
2 weeks of data taking:2 weeks of data taking: May 27 – June 3 (Main users) June 3 - 10 (Parasitic with Alice Dimuon Trigger)
Participants:Participants: Roma: Antonio Di Domenico
Claudio Luci
Ludovico Pontecorvo
Manuela Cirilli CERN: Claus Cernoch
Stephanie Zimmermann
2 weeks of data taking:2 weeks of data taking: May 27 – June 3 (Main users) June 3 - 10 (Parasitic with Alice Dimuon Trigger)
Participants:Participants: Roma: Antonio Di Domenico
Claudio Luci
Ludovico Pontecorvo
Manuela Cirilli CERN: Claus Cernoch
Stephanie Zimmermann
Pavia, 30 settembre 2002 Manuela Cirilli X5/3
X5/GIF Set-up
Experimental Area :Experimental Area : Muon beam Cs source of ~700 GBq, 662 keV , absorbers to tune source intensity
Detectors:Detectors: BIS module 0 Bundle
Read-out & DAQ:Read-out & DAQ: Mezzanines + adapter + repeater + CSM MiniDAQ (Win95)
DCS:DCS: BridgeView (Win2000)
Experimental Area :Experimental Area : Muon beam Cs source of ~700 GBq, 662 keV , absorbers to tune source intensity
Detectors:Detectors: BIS module 0 Bundle
Read-out & DAQ:Read-out & DAQ: Mezzanines + adapter + repeater + CSM MiniDAQ (Win95)
DCS:DCS: BridgeView (Win2000)
Pavia, 30 settembre 2002 Manuela Cirilli X5/4
Detectors
BIS module 0:BIS module 0: 170cm 30 tubes X 4 layers X 2 ml parallel gas distribution
Bundle:Bundle: 280cm 6 tubes X 4 layers (1 layer disconnected from gas and HV due to a broken wire) serial gas distribution (6 tubes in series)
BIS module 0:BIS module 0: 170cm 30 tubes X 4 layers X 2 ml parallel gas distribution
Bundle:Bundle: 280cm 6 tubes X 4 layers (1 layer disconnected from gas and HV due to a broken wire) serial gas distribution (6 tubes in series)
BISBIS
BUNDLEBUNDLE
Pavia, 30 settembre 2002 Manuela Cirilli X5/5
Experimental Area
Gas area
Pavia, 30 settembre 2002 Manuela Cirilli X5/6
Gas distribution
Bundle OUTBundle OUT
BIS INBIS INML1ML1
ML2ML2Pressure Controller
(w.r.t. Patm)
Bundle INBundle IN
Rotameter
Pressure Controller (absolute P)
Water and Oxygen content monitored
BIS BIS OUTOUTML2ML2
ML1ML1
Premixed ArCo2
Pavia, 30 settembre 2002 Manuela Cirilli X5/7
Operating conditions / 1
No gas circulation on BIS:No gas circulation on BIS: too much pick-up noise:
~10 kHz on most tubes
< 2 Hz without circulation
Stainless steel pipesStainless steel pipes BIS operating conditions:BIS operating conditions:
1 volume/day oxygen < 15 ppm, water ~50-100 ppm
Bundle:Bundle: 0.5 volume/day (~ 2.4 l/h2.4 l/h) leaking ~ 100 X Atlas specs
No gas circulation on BIS:No gas circulation on BIS: too much pick-up noise:
~10 kHz on most tubes
< 2 Hz without circulation
Stainless steel pipesStainless steel pipes BIS operating conditions:BIS operating conditions:
1 volume/day oxygen < 15 ppm, water ~50-100 ppm
Bundle:Bundle: 0.5 volume/day (~ 2.4 l/h2.4 l/h) leaking ~ 100 X Atlas specs
Pavia, 30 settembre 2002 Manuela Cirilli X5/8
Operating conditions / 2
Nominal HV and threshold Nominal HV and threshold (except special scans):: HV= 3080 V separate HV system for BIS and Bundle thresh=114
T monitored with 12 PT100s:T monitored with 12 PT100s: fluctuation over the whole run period: 18-24.5˚18-24.5˚ Temperature correction needet
Bundle pressure @ 3 bar w.r.t. PBundle pressure @ 3 bar w.r.t. Patmatm::
Patm monitored thanks to the DCS
of the Rome2 RPC set-up
Nominal HV and threshold Nominal HV and threshold (except special scans):: HV= 3080 V separate HV system for BIS and Bundle thresh=114
T monitored with 12 PT100s:T monitored with 12 PT100s: fluctuation over the whole run period: 18-24.5˚18-24.5˚ Temperature correction needet
Bundle pressure @ 3 bar w.r.t. PBundle pressure @ 3 bar w.r.t. Patmatm::
Patm monitored thanks to the DCS
of the Rome2 RPC set-up
Pavia, 30 settembre 2002 Manuela Cirilli X5/9
Electronics & DAQ
BIS:BIS: 5 mezzanines on each multilayer ADCs for pulse height studies
Bundle:Bundle: 1 mezzanine
DAQ rates:DAQ rates: from ~150 Hz (ADC, full source intensity, local data storage) to ~450 Hz
BIS:BIS: 5 mezzanines on each multilayer ADCs for pulse height studies
Bundle:Bundle: 1 mezzanine
DAQ rates:DAQ rates: from ~150 Hz (ADC, full source intensity, local data storage) to ~450 Hz
disconnected layer
Pavia, 30 settembre 2002 Manuela Cirilli X5/10
Collected Data / 1
43.7 M Evts collected:43.7 M Evts collected: ~19 GB including random triggers for rate measurements and ADC calibration runs
32.7 M Evts with beam tracks32.7 M Evts with beam tracks Data includes angular and HV scans at differentData includes angular and HV scans at different source intensitiessource intensities Tube rates: Tube rates:
Absorption 5 - 10: nominal Atlas conditions (100
Hz/cm2) Absorption 1 (full source intensity):
Atlas with safety factor 5
43.7 M Evts collected:43.7 M Evts collected: ~19 GB including random triggers for rate measurements and ADC calibration runs
32.7 M Evts with beam tracks32.7 M Evts with beam tracks Data includes angular and HV scans at differentData includes angular and HV scans at different source intensitiessource intensities Tube rates: Tube rates:
Absorption 5 - 10: nominal Atlas conditions (100
Hz/cm2) Absorption 1 (full source intensity):
Atlas with safety factor 5
Pavia, 30 settembre 2002 Manuela Cirilli X5/11
Collected Data / 2
Pavia, 30 settembre 2002 Manuela Cirilli X5/12
Tube spectra at maximum rate
Beam data (2h)Beam data (2h)
Cosmics data (12h)Cosmics data (12h)
Pavia, 30 settembre 2002 Manuela Cirilli X5/13
Event display (Persint) @ max rate
Pavia, 30 settembre 2002 Manuela Cirilli X5/14
Planned Analyses
Autocalibration @ high rate Autocalibration @ high rate (BIS+Bundle) Ageing tests Ageing tests (Pulse height studies on BIS) Performance of pattern recognition algorithms Performance of pattern recognition algorithms
@ high rate @ high rate (BIS+Bundle) Test of the serial gas system @ high rate Test of the serial gas system @ high rate (Bundle)
Study of the max. drift time vs. tube position Easy (in principle) with source off Source on:
Lots of bkg on the TDC spectrum: clean it using BIS as an external tracker At abs1, also distortion of the spectrum: unfolding
Autocalibration @ high rate Autocalibration @ high rate (BIS+Bundle) Ageing tests Ageing tests (Pulse height studies on BIS) Performance of pattern recognition algorithms Performance of pattern recognition algorithms
@ high rate @ high rate (BIS+Bundle) Test of the serial gas system @ high rate Test of the serial gas system @ high rate (Bundle)
Study of the max. drift time vs. tube position Easy (in principle) with source off Source on:
Lots of bkg on the TDC spectrum: clean it using BIS as an external tracker At abs1, also distortion of the spectrum: unfolding
Pavia, 30 settembre 2002 Manuela Cirilli X5/15
Study of Tmax vs. Tube in the Bundle
Initial strategy: Initial strategy: Use only source off data Use only data taken in nominal conditions of gas pressure, HV, threshold Combine source off runs only when there were no runs with the source on in between Typical run: 500 M Evts All 6 tubes in a layer have reasonable statistics
Initial strategy: Initial strategy: Use only source off data Use only data taken in nominal conditions of gas pressure, HV, threshold Combine source off runs only when there were no runs with the source on in between Typical run: 500 M Evts All 6 tubes in a layer have reasonable statistics
Pavia, 30 settembre 2002 Manuela Cirilli X5/16
Beam Profile
~40 cm disconnected layer
broken wire
Beam direction
Pavia, 30 settembre 2002 Manuela Cirilli X5/17
Typical Bundle spectrum & fit
Counts
Pavia, 30 settembre 2002 Manuela Cirilli X5/18
Bundle Tmax vs. Tube
Layer 2 Layer 3
Layer 4
Tube nb
Tm
ax (
ns)
Tube nb
Tube nb
Tm
ax (
ns) T
max (
ns)
Runs 5-6-7 Runs 5-6-7 on 28/05 on 28/05
Runs 5-6-7 Runs 5-6-7 on 28/05 on 28/05
broken wire
noisy tube
noisy tube
Pavia, 30 settembre 2002 Manuela Cirilli X5/19
Problems / 1 Layer 1
Layer 3 Layer 4
Layer 2 Comparison with BIS: Comparison with BIS:
Use the 6 tubes in the beam: Bundle BIS ML1 BIS ML2
~40 ns difference ~40 ns difference between the two between the two chambers!chambers! And this is not theAnd this is not the end of the story…end of the story…
Comparison with BIS: Comparison with BIS:
Use the 6 tubes in the beam: Bundle BIS ML1 BIS ML2
~40 ns difference ~40 ns difference between the two between the two chambers!chambers! And this is not theAnd this is not the end of the story…end of the story…
Pavia, 30 settembre 2002 Manuela Cirilli X5/20
Problems / 2
Layer 2 Layer 3
Layer 4
Tube nb
Tm
ax (
ns)
Tube nb
Tube nb
Tm
ax (
ns) T
max (
ns)
Bundle Bundle
Tmax Tmax
not constant not constant
over time! over time!
Bundle Bundle
Tmax Tmax
not constant not constant
over time! over time!
Runs 1-2-3 Runs 1-2-3 on 27/05 on 27/05
Runs 1-2-3 Runs 1-2-3 on 27/05 on 27/05
Pavia, 30 settembre 2002 Manuela Cirilli X5/21
Temperature effect Temperature effect Change in atmospheric pressureChange in atmospheric pressure Bad calibration of the pressure controller Bad calibration of the pressure controller Bad calibration of the HV module Bad calibration of the HV module Source intensity during the previous run(s)Source intensity during the previous run(s)
Temperature effect Temperature effect Change in atmospheric pressureChange in atmospheric pressure Bad calibration of the pressure controller Bad calibration of the pressure controller Bad calibration of the HV module Bad calibration of the HV module Source intensity during the previous run(s)Source intensity during the previous run(s)
Possible reasons?
T (˚C ) Tmax(ns) T (˚C ) Tmax(ns)
Bundle 17.7 726 Patm=971,
previous abs =
1
18.7 736 Patm=974, previous abs = 10
BIS ML1 19.3 700 20.0 694
BIS ML2 19.2 701 20.2 698
Bundle 18.0 728 Patm=971,
previous abs =
1
19.5 709 Patm=983, previous abs = 2
BIS ML1 19.5 698 21.4 692
BIS ML2 19.6 700 21.1 695
Bundle 17.0 741 Patm=973, previous abs = 10
19.6 731 Patm=984, previous abs = 2
BIS ML1 18.6 699 21.1 692
BIS ML2 18.5 703 21.3 695
Pavia, 30 settembre 2002 Manuela Cirilli X5/22
TDC spectra: BIS vs Bundle
Counts Counts
Bundle
Bundle
BISBIS
Pavia, 30 settembre 2002 Manuela Cirilli X5/23
TDC spectra: Bundle vs. HV
Counts
HV=3180HV=3180
HV=3280HV=3280
Pavia, 30 settembre 2002 Manuela Cirilli X5/24
Conclusions
Temperature effect Temperature effect Change in atmospheric pressureChange in atmospheric pressure Bad calibration of the pressure controller Bad calibration of the pressure controller Bad calibration of the HV module Bad calibration of the HV module Source intensity during the previous run(s)Source intensity during the previous run(s)
Temperature effect Temperature effect Change in atmospheric pressureChange in atmospheric pressure Bad calibration of the pressure controller Bad calibration of the pressure controller Bad calibration of the HV module Bad calibration of the HV module Source intensity during the previous run(s)Source intensity during the previous run(s)
Gas mixture? Gas mixture? Water contamination? Water contamination? Pressure drop on the capillaries?Pressure drop on the capillaries?
Ruled o
ut
Ruled o
ut
What’s left?What’s left?