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Mock-up tests at CERN. One row of MWPC in one quadrant of Station M#X (size of ‘wall’ 1.5x5.5m). M4M5R1 M2M3R2 M3M4M5R3) M3R4 M4R4 (M5R4). Goals To check functionality and stability of different type of chambers at various conditions: - PowerPoint PPT Presentation
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5 September 2006 A.P.Kashchuk 1
One row of MWPC in one quadrant of Station M#X (size of ‘wall’ 1.5x5.5m)M4M5R1 M2M3R2 M3M4M5R3) M3R4 M4R4 (M5R4)
GoalsTo check functionality and stability of different type of chambers at various conditions: grounding, shielding, variation of LV, external EMI, effects of parasitic currents and voltage in ground, in LV and HV-lines, etc.
To get experience in assembling MWPC on the Wall and To prevent possible problems during ‘dressing’, further tests and installation of chambers in pit
To develop software for tests of ‘dressed’ chambers on cosmics and for commissioning, etc.
5 September 2006 A.P.Kashchuk 2
with participation of
LHCb muon CERN group, PNPI group,INFN groups
with help and full support of management:
Giovanni, Burkhard, Alexei, Pierluigi
with high interest of
T.Nakada, W.Witzeling, J.Christiansen
Thank to Pavel E., Stas and Pavel K.for help in mock-up assembling
5 September 2006 A.P.Kashchuk 3
M5R1 has been installed first
5 September 2006 A.P.Kashchuk 4
Good events: operational chambers
were moved to mock-up testsfrom various groups (CERN, INFN, PNPI)
5 September 2006 A.P.Kashchuk 5
Two chambers of M3R4(PNPI) operating in parallel during night at HV=2600V detect cosmics
at high count uniformity(count non-uniformity ~1%)
Cosmics collected during night
M3R4#112 M3R4#107
5 September 2006 A.P.Kashchuk 6
Cosmics: M3R4 #112,#107 horizontal and vertical
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"Ver#112 HV=common" Ver#107 HV=common
Hor#112 HV=common Hor#107 HV=common
Cosmics: M3R4 #112,#107 horizontal and vertical
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HV (V)C
ou
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pe
r p
ad
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r 1
00
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c
Ver#112 (3+4)=2450V (1+2)=scan Ver#107 (3+4)=2450V (1+2)=scan
Hor#112 (1+2)=2450V (3+)=scan Hor#107 (1+2)=2450V (3+4)=scan
are measured on cosmicsin self-triggering mode using 2AND-logic built-in inside FEE chip
Cross-talks obtained from the slope of HV plateau:5-10% in range of HV=2650-2750V
It increases above 2800V, as expected
HV plateau and X-talks
Slope and cross-talks are lessbecause one bigapat lower HV=2450V
slop
e
HV plateau 400V
1. Measured at equal HV 1. One bigap at HV=2450V, another - scan
2 fundamental characteristics:
Note: X-talks are doubled at equal HV
5 September 2006 A.P.Kashchuk 7
Cosmic muons (horizont): Bigap(1+2) at 2450V, Bigap(3+4)=scan
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HV (V)
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M3R4 (TH=15fC) M5R1 (TH=6fC)
300V
Correct cosmic rays fluxes at given acceptance, as expectedOperational HV-plateau 300V, as expectedCross-talk in CPC (M5R1) is higher (see slope) w.r.t. WPC (M3R4), as expected
in Hz/m2
is reference to detect problems in both hardware and software (during debagging)
HV operational 300V
Cosmic rays flux
5 September 2006 A.P.Kashchuk 8
5.5m
5 September 2006 A.P.Kashchuk 9
All 20 various types of MWPC (CPC-SCRO, CPC-DCRO and WPC)
fully and finally equippedare planed to be tested on mock-up
5 September 2006 A.P.Kashchuk 10
MWPCwith CARDIAC
VME crate 6U
PCUSB2Canbusinterface
ControlData
Service Board (Roma1) -1Gate Board (Roma1) -1
ACQ modules as 64-input scalers(Roma2, LNF) – # depends on MWPC and readout logic, e.g. 1 module for 8 WPC(M3R4) 1.5 for 1 M3R2
CAEN USB-VME bridge -1
Hardware:
Software: (written by Rafael, still not finished)
schematics
Scalers
Kvaser PCIcan 4HS board
5 September 2006 A.P.Kashchuk 11
Bad events and effectsobserved during preparation and
tests on mock-up
5 September 2006 A.P.Kashchuk 12
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M3R2#26 (Cathodes)Noise spectra
43 minutes per 192 channelsat 100ms gate (case M4M5R1) ~ 1 hour per 224 ch. (M3R2)
Very high parallelismis needed in pitto scan spectra
and load parametersto FEE
in a reasonable time
Do we
have
so m
any o
pera
tors
with e
xper
ience
?
From
whe
re th
ey co
me?
Multiply to number of chambers…~ 2 months of work
5 September 2006 A.P.Kashchuk 13
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M3R2#26 (Wires)
5 September 2006 A.P.Kashchuk 14
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M3R2#26 (Cathodes)
%22CARDIACBad
5 September 2006 A.P.Kashchuk 15
CARDIAC quality still low
5 September 2006 A.P.Kashchuk 16
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Cut data
Add noise
Does not see FEE-addressesBad contact modifies 1sec time gate
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Pedestal appears
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4 5
Such bouquet
was not expected
3
5 September 2006 A.P.Kashchuk 17
Serious problem with connector for I2C used in Service Board?
All SB produced
Many cables already installed in pit
5 September 2006 A.P.Kashchuk 18
There is another problem Service Board
sometime losses control (and SB even does not see FEE-ddresses);
VME crate OFF/ON helps
?
5 September 2006 A.P.Kashchuk 19
Scope shows presence of parasitic voltage in ground
~2V
p-p
~2V
p-p
The source:
5 September 2006 A.P.Kashchuk 20
Voltage on CAEN ground w.r.t. Common ground (rack)
2V p
eak-
peak
5 September 2006 A.P.Kashchuk 21
FFT gives a few peaks in range of 8-16MHz (well within FEE bandwidth) repeating rate ~38kHz
~2V
p-p
f=8-16MHz
A radio-frequency cavity in the PS.
5 September 2006 A.P.Kashchuk 22
ACQ?
M5R1 HV=2450V
Cosmics counts collected during night in self-triggering mode (2AND logic)
Bad contacts inOPB – the worst case!!!
Statistics or missing counts?
Statistics?
5 September 2006 A.P.Kashchuk 23
50MHz50MHz
Mis
sing c
ounts
due to
ACQ
are
possib
le
Note:ACQ can be used either as multi-scaler or register.In tests below it is64-channel scaler;
In tests below ACQ satisfactory operates at ~ 100MHz
5 September 2006 A.P.Kashchuk 24
Good pulse width for ACQ 10ns
Bad pulse width for ACQ 5ns
Mis
sing c
ounts
due to
ACQ
are
possib
le
5 September 2006 A.P.Kashchuk 25
First cosmics on mock-upM5R1 HV=2650V
?
5 September 2006 A.P.Kashchuk 26
Replaced I2C-cable
M5R1, HV=2750VTH=7fC
First panoramic view on mock-upM5R1 HV=2650V
14 August 200630 minutes
during lunch timeThen during the day
was impossible to reproduce
ReasonsReasons…many
5 September 2006 A.P.Kashchuk 27
Tests were performed in presence of parasitic voltage in ground
~ 2V peak-to-peak of wide frequency spectrum
5 September 2006 A.P.Kashchuk 28
Criterion (noise count at operational threshold): cycle of 1sec – count uniformity and rate (Hz)
M5R1#08 TH=6fC HV=2750V/2450V TH=7fC
TH=8fC TH=9fC
5 September 2006 A.P.Kashchuk 29
M5R1#08 TH=6fC HV=2750V/2450V
Criterion: statistics during long time– count uniformity
TH=10fC does not help
5 September 2006 A.P.Kashchuk 30
Criterion (noise count at operational threshold): cycle of 1sec – count uniformity and rate (Hz)
Before increasing thresholds
Before increasing thresholds
one must try better ground FC to wall
one must try better ground FC to wall
- as low impedance, as better
- as low impedance, as better
M5R1#08 TH=6fC HV=2750V/2450V
5 September 2006 A.P.Kashchuk 31
M5R1:TH=6fC at HV2750/2450
Mean ~1-2Hz
Cycle of 1sec – count uniformity and rate (Hz)
5 September 2006 A.P.Kashchuk 32
TH=6fC at HV2750/2450
padHz /06.0~ padHz /06.0~
M5R1#08Count non-uniformity <10%
(statistics)
Try to collect statistics during night … here ~ 2 hours
5 September 2006 A.P.Kashchuk 33
Count non-uniformity 5.6%Statistics ~3%, what other ~3%
M5R1 2750/2450VPulse width 25ns
Statistics during ~12 hours of real time
%31000
1000
Other 3% - X-talks non-uniformity (profile, modulation)Grouping of bins reduce visible %, see case of M4R4 (2AND/4OR logic) in slide 23
5 September 2006 A.P.Kashchuk 34
Statistics during ~12 hours of real time (another day)
Count non-uniformity 5.6%M5R1 2750/2450VPulse width 20ns
5 September 2006 A.P.Kashchuk 35
Count non-uniformity 9%
M5R1 2750/2450VPulse width 17ns
Statistics during ~6 hours
5 September 2006 A.P.Kashchuk 36
Statistics during ~1 hour
Count non-uniformity 22%
M5R1 2750/2450VPulse width 10nsMissing counts dominate here, ACQ can not count
5 September 2006 A.P.Kashchuk 37
Experiment Cosmic tests2OR (bigap-to-bigap) 2AND (bigap-to-bigap)
2OR/2OR 2AND/2OR
2OR/4OR 2AND/4OR
? 2AND-wires
2AND/2OR-cathodes
? Special during tests to reduce # cables
e.g. 2AND/4OR everywhere
in DIALOG
No software
yet
5 September 2006 A.P.Kashchuk 38
M4M5R1
5 September 2006 A.P.Kashchuk 39
M5R1#08 (vertical, mock-up) HV scan on cosmics in self-triggering mode (2AND logic)
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(3+4)=2450V, (1+2)=scan
Rather slow work: 6 minutes of real time per point in lab. ~1 hour/point in pit
Higher gain in left side
~300V plateau (operational)~5% cross-talks at 2650V
~300V plateau (operational)~5% cross-talks at 2650V
),(30~2
Am
Hz ),(30~2
Am
Hz
HV-plateau and slope - correctCosmic rays flux - correct
5 September 2006 A.P.Kashchuk 40
M3M4R4
Thank to Boris and Yuryfor help and participation
in measurements
5 September 2006 A.P.Kashchuk 41
M3R4#112 and #107(read as M4R4 here)
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#112 (1+2)=2450V, (3+4)=scan #107(1+2)=450V, (3+4)=scan
),(60~2
Am
Hz ),(60~2
Am
Hz
),(60~2
Am
Hz ),(60~2
Am
Hz
2AND-readout
2AND/4OR-readout
HV-plateau and slopes - correctCosmic rays flux - correct
5 September 2006 A.P.Kashchuk 42
M3M4M5R3
Where resistor in HV-return?
Thank to Rafael for participation
in measurements
5 September 2006 A.P.Kashchuk 43
Operation: CARDIAC replaced (DIALOG bad, CARIOCA good)
5 September 2006 A.P.Kashchuk 44
M3R3#29
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per
pad
in
2'
Bigap(1+2)=2450V, (3+4)=scan
X-talk=10%
Higher gain in left side
~300V plateau (operational)~300V plateau (operational)
),(60~2
Am
Hz ),(60~2
Am
Hz
Slope more than in WPC,as expected, higher cross-talksdue to higher capacitive couplingand due to not enough Cblock
There is HV-plateau X-talks- too much
Cosmic rays flux - correct
TH=6fC
5 September 2006 A.P.Kashchuk 45
HV=2550/2650V, TH=7fC@13mV/fCLogic 2AND
Count non-uniformity ~3%modulated by X-talks
5 September 2006 A.P.Kashchuk 46
Cosmics counts collected during night
Count non-uniformity ~5%modulated by X-talks
HV=2450/2750V, TH=7fC@13mV/fCLogic 2AND/2OR
5 September 2006 A.P.Kashchuk 47
M5R4 (M5R2 missing)
Where resistor in HV-return?
Thank to Giacomo for his interest and participation
in measurements
5 September 2006 A.P.Kashchuk 48
M5R4 - Firenze
M3R3 - Frascati
5 September 2006 A.P.Kashchuk 49
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M5R4#127 – FEE noise spectra
A=00
A=01
A=02
Replaced CARDIAC
(DIALOG chip was problematic)
Acceptable
Very good
5 September 2006 A.P.Kashchuk 50
M5R4#127
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Bigap(3+4)=2450V, (1+2)=scan
X-talk=20%
No plateauHigh cross-talks
Signature of bad CARDIAC
Measured before replacement
5 September 2006 A.P.Kashchuk 51
M5R4#127
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Replaced CARDIAC PNPI
X-talk=5%
),(70~2
Am
Hz ),(70~2
Am
Hz
There is plateau; cosmics flux -correct; cross-talks more than expected
(much higher than in PNPI M3R4)
300V operational300V operational
M3R4 (PNPI) for comparison
5 September 2006 A.P.Kashchuk 52
Scope shows often multiple pulses, which give high count rise at 2800V
M5R4#127
Note: particles cross often the chamber alongwires producing large signals (x10) which will be rare in the LHCb experiment)
5 September 2006 A.P.Kashchuk 53
M5R4#127Cosmics count during night in self-triggering mode (2AND/4OR logic)
HV=2450/2750V, TH=15fC@9mV/fCCount non-uniformity ~ 7%
Higher X-talks due to gas gain non-uniformity in bigap (1+2)enough to have a few points with micro discharge
5 September 2006 A.P.Kashchuk 54
ifmeasurements on cosmicsgive correct curve ‘Count vs. HV’
then … chamber acceptedelse … fix problem and repeat end if…
5 September 2006 A.P.Kashchuk 55
3 3 WorkStationsWorkStations, as developed on mock-up tests, have to be assembled at CERN
for each group:
PNPI to test 600 chambers automatically (8 WPC-chambers in parallel)In average ~8 WPC-chambers per day + night (day preparation, night measurements);
INFN to test 600 chambers automatically (8 WPC-chambers in parallel or 4 CPC-chambers in parallel), In average ~6 chambers per day + night (day preparation, night measurements);
CERN to test 200 chambers automatically (4 CWPC-chambers in parallel)In average ~4 chambers per day + night (day preparation, night measurements);
Note: SSimilarimilar WorkStationWorkStation for GEMfor GEMIn addition: Cables and connectors in pit have to be commissioned before chamber installation
Similar WorkStations
will be needed soon in pit
to smoothly move in the experiment
Mandatory
how to make final tests before installation
Start: OctoberFinish: February
5 September 2006 A.P.Kashchuk 56
Problematic gap: M1R4#5/Gap1 (LNF)before and after 16 hours on GIFat reversed HV=-2340V
Compare to chamber arriving from LNF (red)
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5 September 2006 A.P.Kashchuk 57
M3R4 at reversed HVI vs. V measured on GIF
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Beginning end end2
MWPC conditioning (comparison)
5 September 2006 A.P.Kashchuk 58
M2R1#07 after 135h of wire conditioning in lab.
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Only few % pass additional conditioning in GIF at reversed HV