mock-up tests at cern

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.


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


M5R1 has been installed first


Good events: operational chambers

were moved to mock-up testsfrom various groups (CERN, INFN, PNPI)


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


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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ou

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r 1

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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


Cosmic muons (horizont): Bigap(1+2) at 2450V, Bigap(3+4)=scan

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un

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z/m

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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


5.5m


All 20 various types of MWPC (CPC-SCRO, CPC-DCRO and WPC)

fully and finally equippedare planed to be tested on mock-up


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


Bad events and effectsobserved during preparation and

tests on mock-up


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A=03

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


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A=04

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M3R2#26 (Wires)


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A=10

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M3R2#26 (Cathodes)

%22CARDIACBad


CARDIAC quality still low


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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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Such bouquet

was not expected

3


Serious problem with connector for I2C used in Service Board?

All SB produced

Many cables already installed in pit


There is another problem Service Board

sometime losses control (and SB even does not see FEE-ddresses);

VME crate OFF/ON helps

?


Scope shows presence of parasitic voltage in ground

~2V

p-p

~2V

p-p

The source:


Voltage on CAEN ground w.r.t. Common ground (rack)

2V p

eak-

peak


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.


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?


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


Good pulse width for ACQ 10ns

Bad pulse width for ACQ 5ns

Mis

sing c

ounts

due to

ACQ

are

possib

le


First cosmics on mock-upM5R1 HV=2650V

?


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


Tests were performed in presence of parasitic voltage in ground

~ 2V peak-to-peak of wide frequency spectrum


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


M5R1#08 TH=6fC HV=2750V/2450V

Criterion: statistics during long time– count uniformity

TH=10fC does not help


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


M5R1:TH=6fC at HV2750/2450

Mean ~1-2Hz

Cycle of 1sec – count uniformity and rate (Hz)


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


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


Statistics during ~12 hours of real time (another day)

Count non-uniformity 5.6%M5R1 2750/2450VPulse width 20ns


Count non-uniformity 9%

M5R1 2750/2450VPulse width 17ns

Statistics during ~6 hours


Statistics during ~1 hour

Count non-uniformity 22%

M5R1 2750/2450VPulse width 10nsMissing counts dominate here, ACQ can not count


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


M4M5R1


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


M3M4R4

Thank to Boris and Yuryfor help and participation

in measurements


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


M3M4M5R3

Where resistor in HV-return?

Thank to Rafael for participation

in measurements


Operation: CARDIAC replaced (DIALOG bad, CARIOCA good)


M3R3#29

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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


HV=2550/2650V, TH=7fC@13mV/fCLogic 2AND

Count non-uniformity ~3%modulated by X-talks


Cosmics counts collected during night

Count non-uniformity ~5%modulated by X-talks

HV=2450/2750V, TH=7fC@13mV/fCLogic 2AND/2OR


M5R4 (M5R2 missing)

Where resistor in HV-return?

Thank to Giacomo for his interest and participation

in measurements


M5R4 - Firenze

M3R3 - Frascati


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M5R4#127 – FEE noise spectra

A=00

A=01

A=02

Replaced CARDIAC

(DIALOG chip was problematic)

Acceptable

Very good


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


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


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)


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


ifmeasurements on cosmicsgive correct curve ‘Count vs. HV’

then … chamber acceptedelse … fix problem and repeat end if…


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


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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Cu

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MWPC conditioning (comparison)


M3R4 at reversed HVI vs. V measured on GIF

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I (n

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Beginning end end2



M2R1#07 after 135h of wire conditioning in lab.

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Only few % pass additional conditioning in GIF at reversed HV

mock-up tests at cern

Documents

range of hv

slope of hv plateau

bigapat lower hv

installation of chambers

night m3r4

tests of dressed chambers

infn groups

pnpitwo chambers of