DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

1

Rome group activity since lastmeeting (4)

Salvatore Frullani / INFN-Rome Sanità Group

OLYMPUS CollaborationDESY 30/August/2010

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

2

Outline

• GEM electronics:– Since last meeting only activity done has been

during test beam in DESY 19-27 August (before: material sent to DESY; after: summer vacations)

– Results obtained during test (no futher analysis has been possible due to vacations)

– Points to be solved working with all system connected in lab

• MWPC electronics:– Information needed on radiation environment where

front end cards should be installed

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

3

• Test beam in July has been also the first opportunity to connect all the system:HV, GEM chamber, FEC, VME than results hasto be considered as the first essay on the system. Several problems have prevented totest the complete system at lab before test beamperiod.

• People: Evaristo Cisbani (INFN-ISS), JuergenDiefenbach (Hampton), S.F. (INFN-ISS), Massimo Gricia (INFN-ISS), Paolo Musico (INFN-Genoa), Roberto Perrino (INFN-Bari)

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

4

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

5

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

6

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

7

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

8

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

9

Electronics ComponentsGEM ⇒ FEC ⇒ ADC+VME Controller ⇒ DAQ

Main features:• Use analog readout APV25 chips (wire-bonded on standard PCB, no

ceramics): proven to work in COMPASS• ZIF connector on the GEM side (no soldering on readout foil) • Minimum electronics components (front-end + VME custom module)• Copper connection between front-end and VME

2D R

eado

ut

Up to 10m or + ?

80 mm

49.5

mm

8 mm

Up to16 FEC

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

10

Slow Control

HV management is not trivial!

7 HV levels must rump up/down coherently

Low pass filters

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

11

• First and main problem to understand: Noise

– Configuration: 1 FEC connected to GEM output to the test board and then to the oscilloscope. Reset, Clock and trigger from VME master at 20 MHz. Other 3 FEC connected to the GEM and readout bus but not powered.

– FEC with LV on and disconnected from the chamber shows RMS = 8 mVFEC with LV on and connected to the chambershows RMS = 55 mV

– Tried to reduce the RMS by checking the cross-grounding between various componentsof the system: LV, HV, DAQ, FE, Chamber. Shorting two-by-two of the respective localgrounds does not affect the RMS.

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

12

– Disconnect HV pins from chamber one-by-one:RMS goes from ~50 to 15 mV !!!Source of noise likely coming from HV supplier

– Put decoupling filter (1 MOhm resistors) between HV cable pins and chamberRMS drops to 13 mVThe filter is effective. Decided to keep it in place.

– Different situation respect to last year test beam withGassiplex chip. Gassiplex electronics adjusted forRICH readout (strips about 10 cm) while present FEC adjusted (?) for longer strips (Compass 30x30cm2-SBS 40x50 cm2) – possible explanation : adjustment

of chamber capacity.

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

13

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

14

All FEC connected to GEM and VME controller

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

15

Pedestal no beam without mapping readjustement

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

16

Pedestal after mappingno beam

Pedestal after mappingwith beam_latency 10

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

17

Beam on first and fourth FEC

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

18

Beam off

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

19

Beam on again – different clock phase

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

20

Beam on – another phase

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

21

Cable lenght from FEC to VME (oscilloscope)

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

22

Cable lenght 2

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

23

3 m

10 m

13 m

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

24

Outlook• The system seems working with data

acquired and treated by all components• Problem to be solved noise, probably due

to a wrong impedence matching betweenFEC and GEM chamber

• Firmware to be completed and makeflexible to different configurations and checks

• Full test in lab during next month of September, foreseen new test beam at CERN (within RD51) or/and DESY in October

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

25

MWPC readout PCOS4 system LeCroy-ISS design for HERMES

• Monitor MWP Chambers: 400 channels each -> 25 PCOS4 cards + 2 backplanes 14 slots + ½ VME module

• For 6 chambers: 2400 channels -> 150 fec + 12 backplanes + 3 VME modules + 1 VME controller + 1 fanout module

• Readout electronics and some spare• Electronics needed for RICH SBS then we must

guarantee a use in safe condition• Conditions used for HERMES MWPC and RICH

must be reproduced: temperature control, switches and relays for low voltage power supply, patch panels and all other services

DES

Y 30

/Aug

ust/2

010

Oly

mpu

s C

olla

bora

tion

mee

ting

S.Fr

ulla

ni /

Rom

egr

oup

activ

ity4

26

MWPC readout electronics

• Essential to measure the radiation fieldwhere the electronics should be put.

• Difference with HERA should beconsidered when beam is lost: differentcurrent (factor 3-4 higher for DORIS – butless charge stored), different lenght(HERA 6.3 km – DORIS 300 m) forpossible impact on detector and electronics

• To be measured in order to test cardsunder same radiation field