Test Beam @ X5/GIF: Status Report Manuela Cirilli.

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


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)


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


Experimental Area

Gas area


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


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


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


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


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


Collected Data / 2


Tube spectra at maximum rate

Beam data (2h)Beam data (2h)

Cosmics data (12h)Cosmics data (12h)


Event display (Persint) @ max rate


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


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


Beam Profile

~40 cm disconnected layer

broken wire

Beam direction


Typical Bundle spectrum & fit

Counts


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


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…


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


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


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


BIS ML1 18.6 699 21.1 692

BIS ML2 18.5 703 21.3 695


TDC spectra: BIS vs Bundle

Counts Counts

Bundle

Bundle

BISBIS


TDC spectra: Bundle vs. HV

Counts

HV=3180HV=3180

HV=3280HV=3280


Conclusions



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?

Test Beam @ X5/GIF: Status Report Manuela Cirilli.

Documents

series bis bundle slide

hz bis

ppm bundle

p atm bundle

bundle readout daq

hv scans

series bis module

gas circulation