dimuon spectrometer : status of the tracking chambers

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1

Dimuon Spectrometer :Status of the tracking chambers

• What’s in – what’s out

• Review of the components

• Chambers efficiency

• My personal view of the priorities for the shutdown

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2

ALICE Dimuon Spectrometer

x

y

z

Dimuon Spectrometer

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3

What’s in – what’ out MCHVIEW of the noise

At best we took data with stations 1,2 and 5, chamber 5, chamber 7 outside/left.

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4

MCH components review (simplified view!)

MCH Readout

CROCUS

High Voltages

Low Voltages

Ventilation

Gas flow

FEE

FEE

MCH detector

Physics/PRL

ALICE DAQ

Offline

analysis

Geometry Monitoring

System (GMS)

Detector Control System

OCDB

Sw interlocks

Hw interlocks

SHUTTLE

Pedestals, noises, gains

Physics Data

Physics Data

CastorCAFLCG

Monitoring

SA

FE

TY

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5

MCH Readout : Crocus/Trigger

Readout the MCH, manage busy and send data to DAQ – annoying bugs found (causing busy of our readout)

– good handling of trigger sequences with :• reject• errors

– compliant with latest ALICE DAQ and Trigger (CTP) requirements

– nice tool (interfaced to our trigger crate) to monitor the busy of readout/Crocus.

• implements a full reset “button”

• Some news problems ? – lost connection with 2565 and 2577

more about this in the last slides

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6


MCH Readout

CROCUS

High Voltages

Low Voltages

Ventilation

Gas flow

FEE

FEE

MCH detector

Physics/PRL

ALICE DAQ

Offline

analysis

Geometry Monitoring

System (GMS)


OCDB

Sw interlocks

Hw interlocks

SHUTTLE


Physics Data

Physics Data

CastorCAFLCG

Monitoring

SA

FE

TY

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7

MCH Detector Algorithm

The DA computes data taking condition parameters – pedestal and noise per readout channel

(μ,δ) give threshold for 0-suppression : critical parameter !

• Mean and sigma values of pedestals; Pedestal file generated by makeped;; structCrocusCmdHeader; uiChecksum eCrocusCommand uiFrtCrtTargetIds[2]0x000100060x000000060x000200000x00030000; structFrtCrtCmdHeader #0; uiChecksum uiFrtCrtIdTarget uiFrtIdTargets[5]0x000f00000x000200000x000500000x000b00000x000900000x000d00000x00070000; structFrtCmdHeader #0; uiChecksum eCrocusCommand uiFrtIdTarget0x000500050x000000060x00050000; FRT 0x00050000 Lport 0 -> BP 60x000000030x000000000x00000000; FRT 0x00050000 Lport 1 -> BP 70x000000030x000000000x00000000; FRT 0x00050000 Lport 2 -> BP 80x000000030x000000000x00000000; FRT 0x00050000 Lport 3 -> BP 90x000000030x000000000x00000000; FRT 0x00050000 Lport 5 -> BP 100x000000030x000000000x00000000; structRawDataHeader; uiHeaderChecksum bLastChunk uiRawDataLength uiRawDataChecksum0x029003530x000000010x000003cf0x0290009d; RawData; Lport 0 -> BP 6 with 3 manus; Manu 16 (0x00400000)0x004000000x000000c20x000001060x000000d10x000000730x00000101

….

//===========================================================================

// NEW File calculated by makeped//

===========================================================================

// * Statictics : 1000// * # of MANUS : // * # of channels : ////---------------------------------------------------------------------------//---------------------------------------------------------------------------//format : BUS_PATCH MANU_ADDR CHANNEL MEAN SIGMA//---------------------------------------------------------------------------1 4 0 112.572 0.8699521 4 1 207.938 0.8911541 4 2 212.385 1.069011 4 3 242.233 0.9770931 4 4 302.468 1.026151 4 5 221.775 0.9188991 4 6 263.75 1.008711 4 7 185.86 0.9840731 4 8 241.141 0.9439911 4 9 246.949 0.919999• 4 10 209.31 0.89883

…

Flat ASCII file SHUTTLE

CROCUS Thresholds file FEE

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8

MCH Detector Algorithm

Measured DAC values (Data)

Inpu

t DAC

val

ues

(pad

sid

e)

5

43

1

8

9

6

7(t)

2x<xt : f1(x)=a1 x + a0

x>xt : f2(x)=f1(xt) +a1 (x-xt) +a2 (x-xt)2

x-xt

a2=1.6 E-04P(2)=0.673a0= - 347.21

a1= 1.1305P(2)=0.934

thre

shol

d

The DA computes data taking condition parameters – gain per readout channel

Calibration method :

linear + parabolic fits 9 (11 nowadays) DAC values + 2 functions

=> 3 parameters: a1,a2,threshold (xt)

//=================================================// BP MANU CH. a1 a2 thres. Q//================================================= 1 3 0 1.0948 2.342e-04 1776 f7 1 3 1 1.3002 3.516e-04 1490 f7 1 3 2 1.3166 1.069e-04 1495 fe 1 3 3 1.3657 1.505e-04 1439 fd 1 3 4 1.3649 9.960e-05 1444 fe ………..…. Flat ASCII file SHUTTLE

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9


MCH Readout

CROCUS

High Voltages

Low Voltages

Ventilation

Gas flow

FEE

FEE

MCH detector

Physics/PRL

ALICE DAQ

Offline

analysis

Geometry Monitoring

System (GMS)


OCDB

Sw interlocks

Hw interlocks

SHUTTLE


Physics Data

Physics Data

CastorCAFLCG

Monitoring

SA

FE

TY

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10

MCH Shuttle

Shuttle transfers data taking condition parameters – gain per readout channel (calculated by the DA)

– pedestal and noise par readout channel (calculated by the DA)

– all high voltage channels (stored in the DCS database)

to the Offline Condition DataBase (0CDB)

mandatory for the offline analysis.

MCH :• pedestals, noises and gains = OK

– (DA updated recently to better handle parity errors)

• high voltages should be soon ok– old problem now clearly identified and being solved

• GMS not tested/implemented !!

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11


MCH Readout

CROCUS

High Voltages

Low Voltages

Ventilation

Gas flow

FEE

FEE

MCH detector

Physics/PRL

ALICE DAQ

Offline

analysis

Geometry Monitoring

System (GMS)


OCDB

Sw interlocks

Hw interlocks

SHUTTLE


Physics Data

Physics Data

CastorCAFLCG

Monitoring

SA

FE

TY

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12

MCH alignment : Photogrammetry and Survey

Javier Castillo

Survey and Photogrammetry provides Day 0 misalignment file• Survey chamber with respect to ALICE• Photogrammetry slat or quadrant with respect to chamber • Available for this run:

• chambers 1, 2, 3, 4 & 5

Ch1

Ch5

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13

MCH alignment with tracks

Javier Castillo

Input misalignments:• Uniform • |X,Y|<300 m• ||< 500 rad

100k - 150k is a reasonable number

Alignment precision:• RMSX = 20 m • RMSY = 10 m• RMS = 20 rad

Global method:• Simultaneous fit to misalignment and track parameters • Millepede

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14


MCH Readout

CROCUS

High Voltages

Low Voltages

Ventilation

Gas flow

FEE

FEE

MCH detector

Physics/PRL

ALICE DAQ

Offline

analysis

Geometry Monitoring

System (GMS)


OCDB

Sw interlocks

Hw interlocks

SHUTTLE


Physics Data

Physics Data

CastorCAFLCG

Monitoring

SA

FE

TY

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15

MCH data monitoring : MOOD

MOOD (Monitoring Of Online Data):– Tools for experts.

– Reads and Decodes raw data from either online stream or file.

– Visualisation of general information : pedestal, noise, gain, hitmap, errors, etc.

– Used for commissioning (noise display) and during cosmic runs (first cluster)

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16

MCH data monitoring : AMORE

AMORE (Automatic MOnitoRing Environment):– Tools for shifters.

– Reads and Decodes raw data from online stream.

– Checks and reports the quality of data (at the raw data level only)

– Interfaced with the Quality Assurance framework of AliRoot.

– Tells to the shifter if we are taking crap or not and give a first diagnostic to the expert.

– Under development.

MCHview-likedisplay of information

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17


MCH Readout

CROCUS

High Voltages

Low Voltages

Ventilation

Gas flow

FEE

FEE

MCH detector

Physics/PRL

ALICE DAQ

Offline

analysis

Geometry Monitoring

System (GMS)


OCDB

Sw interlocks

Hw interlocks

SHUTTLE


Physics Data

Physics Data

CastorCAFLCG

Monitoring

SA

FE

TY

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18

MCH Safety : Interlocks

In terms of detector safety, you always want the belt and the straps • power dissipated by the FEE required air cooling

– if air cooling stops shutdown the low voltages• high voltages on the wire required clean Ar/CO2 mixture

– if input gas stops lower the high voltages

“Hardwired” interlock for air cooling – St1&2 cabled, tested and operating– St3 cabled– St4&5 to be done (not critical)

[for the gas system, hardwired interlock could be cabled but it clearly appears unnecessary]

“Software” interlocks (to be implement in DCS : work started)– if temperatures sensors reach a too high value stop the LVPS– if gas input or output flow is null set the HV to BEAM_TUNING

Ultimately, shifters (in ACR) should not be necessary for MCH safety Presence on site of an-call expert

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19


MCH Readout

CROCUS

High Voltages

Low Voltages

Ventilation

Gas flow

FEE

FEE

MCH detector

Physics/PRL

ALICE DAQ

Offline

analysis

Geometry Monitoring

System (GMS)


OCDB

Sw interlocks

Hw interlocks

SHUTTLE


Physics Data

Physics Data

CastorCAFLCG

Monitoring

SA

FE

TY

HLT

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HLT online display : the detector best friend/advertiser

Worked nicely in Feb/March ; TPC wasn’t running thus the “MUON TV” was on

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New implementation (better integration in Alieve) tested currently at

CERN (HLT group) : ready for the first collisions…?

http://idas.web.cern.ch/idas/onlinedisplay/

Pedestal Display

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Simulated C

luster

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Simulated Track

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MCH Readout

CROCUS

High Voltages

Low Voltages

Ventilation

Gas flow

FEE

FEE

MCH detector

Physics/PRL

ALICE DAQ

Offline

analysis

Geometry Monitoring

System (GMS)


OCDB

Sw interlocks

Hw interlocks

SHUTTLE


Physics Data

Physics Data

CastorCAFLCG

Monitoring

SA

FE

TY

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25

MCH chamber efficiency for p+p 2008 run (ped. run 58492 12/09/08)

DDL id run p+p 2008 noise (0.8-5 ADC) noise (0.8-10 ADC) other problems

2560 yes 99.70% 99.73% no

2561 yes 99.65% 99.65% no

2562 yes 94.67% 94.67% no

2563 yes 98.54% 98.54% no

2564 yes 99.81% 99.81% no

2565 yes 99.76% 99.76% 1 quadrant without HV 49.58%

2566 yes 97.14% 97.14% no

2567 yes 98.51% 98.59% no

2568 no --

2569 yes 14.08% 28.10% Slat02,04 have HV problems Eff <28%

2570 no --

2571 yes 12.66% 32.52% no

2572 yes 41.39% 62.50% no

2573 no --

2574 no --

2575 no --

2576 yes 61.45% 67.21% no

2577 yes 55.37% 68.03% Slat11 with HV problems Eff <68%

2578 yes 69.18% 74.85% no

2579 no --

sta

tio

n 1

sta

tio

n 2

sta

tio

n 3

sta

tio

n 4

sta

tio

n 5

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26

Propositions….and my personal answers

• Station 1 : 3 patch buses to fix – qualitatively we can say that manas die continuously (see last slide)

• Station 2 : changing DE 303 (bottom quadrant on chamber 3 left) ?– no : to risky for chamber 2 and 4. High probability to cause more

damages than solving problems– Chamber 4 at 99%, and then chamber 3 < 75%

• Station 3 – one FRT to change (not sure but best guess)

• and try to improve the arrangement of the patch cables so nobody will ruin them (in my opinion, someone stomp –not step- on them)

– a dedicated team working on the noise of ch5 • no lead so far (aluminum sheets help but not help the Xo)• should not jump from commissioning to noise testing for 2 hours and then

back to commissioning, etc…. • Ch6 should be open and should not be connected before the noise is

understood

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27

Propositions….and my personal answers

• Station 4 : – Chamber 7 right should be the priority

– after full chamber 7 is readout correctly and only after that, one should think about working on chamber 8

• Station 5 – we had the 4 crocus of station 5 in the readout (next slide)

– missing DE • when can they be repaired (if this is possible)• is it worth to open the chambers to put them back

– some patch buses exhibit large fluctuations full bus patch over the threshold slows down the readout

• simplest is to remove them from configuration• check voltages on the power lines ?

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28

General issues

• During the run (no work around the detector), we lost contact with :– 10 patch buses on ch5 most probably the FRT– Crocus chamber 9 right (sylvain couldn’t fix)– Crocus chamber 3 left 2565 ? works fine now : “downward spiral” effect...

+ Crocus chamber 10 right became unstable (readout is fine and then not) after some time… Demonstrates the importance to perform long readout test before the cavern close.

This needs to be understood as soon as possible : changing the

board is not sufficient !

1. CRT/FRT must be returned to Orsay with proper form and proper packaging (anti-static)

2. The database on the Twiki must be updated

3. Commissioning logbook must be updated with relevant information

It might appear a bit tedious but it is the only way to pinpoint and understand if problems are related to DSP/EPROM

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29

General issues

• MANAS are still dying with time (not investigated more). All station should provide some input to ??– I suggest to have somebody working on that

best/easiest way : compare pedestal runs vs time (global tool)

someone from India ?

• Power supplies : clearly the modified LVPS do not have a dramatic effect on the noise. – Still some fluctuations ; all noises of St3,4,5 increased during week 37

– Modifying the others LVPS (St1 and 2) would be a mistake : no clear gain or better understanding of the noise with the modified LVPS

• HV on quadrants/slats : a few can not hold the nominal voltages. But the current configuration is stable (see MCH twiki for details)– can be easily tested in from the ACR (by slowly rising up the voltage

and checking the stability)

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30

General issues

• Something must be done to avoid the screwdriver incident ! Access in the FASS, operation around/in the dipole or near station 4/5 should be supervised. We need to settle down a procedure with the Alice operation group to

get, at least, informed.

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31

Spares slides

• First Physics• more on trigger chambers• Javier’s slides on alignment• Jean-Luc slides on calibration : pedestal, noise, gain, fit quality

Thanks to Indranil, Javier, Jean-Luc, Guillaume, Laurent for preparing

some slides for me

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32

Javier Castillo 32

MUON Spectrometer performances: J/

• Resolution ~ 100 m seems satisfactory• Resolution ~ 50 m perfect

• 10k J/ in acceptance• Full simulation• “Hit errors” increased by 1mm to keep constant efficiency

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33

Javier Castillo 33

MUON Spectrometer performances:

• Resolution < 50 m needed

• 10k in acceptance• Full simulation• “Hit errors” increased by 1mm to keep constant efficiency

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34

Javier Castillo 34

MUON performances - momentum resolution

X,Y=1000 mX,Y= 700 mX,Y= 500 mX,Y= 300 mX,Y= 100 mX,Y= 50 mX,Y= 0 m

Muons from J/

Muons from

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35

MUONTRK_DA : Pedestal mean value

Pictures obtained after analyzing 3 runs: [St_1] , [St_2 + ½ Ch_5 + ½ Ch_7], [St_5]

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36

MUONTRK_DA : Pedestal sigma value

Ch_5 (St_3) are particularly noisy Noise has to be improved in some slats of St_5 Right

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37

MUONTRK_DA : gain parameter a1

Green color indicates Gain mean values around 4 mV/fC

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38

MUONTRK_DA : linear quality fit [range: from 1 (bad) to 15 (good)]

For un-calibrated channels (no a1 extracted) : quality fit codes are forced to 0 and a1 to 0.5

dimuon spectrometer : status of the tracking chambers

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