Flavio Dal Corso - INFN Padova1 OPERA coll. meeting - Hamburg 3 July 2004 RPC & XPC Electronics...

Flavio Dal Corso - INFN Padova 1OPERA coll. meeting - Hamburg 3 July 2004

RPC & XPC Electronics Status

Front End Boards (FEBs) Controllers HV system Crates & Racks


FEB prototype


FEB block schematic


Front End Discriminator

LVDS receiver Very cheap High density

High speed Moderate CMRR (~2

V)


Discriminator PerformancesDiscriminator Linearity

y = 0,9658x + 11,338

-400

-300

-200

-100

0

100

200

300

400

-400 -200 0 200 400

Nominal Thr (mV)

Act

ual

Th

r (m

V)

Linearity Residuals

-1,00

-0,50

0,00

0,50

1,00

-400 -300 -200 -100 0 100 200 300 400

mV

mV

Slope Distribution

0

5

10

15

20

-0,9

82

-0,9

80

-0,9

78

-0,9

76

-0,9

74

-0,9

72

-0,9

70

-0,9

68

-0,9

66

-0,9

64

-0,9

62

Co

un

ts

Offset Distribution

0

5

10

15

-1,5

0,5

2,5

4,5

6,5

8,5

10

,5

12

,5

14

,5

16

,5

18

,5

mV

Co

un

ts

=0.003

=4.1 mV


RPC Strip’s Signals (First measurements done underground)

strip signal

-0,1

-0,05

0

0,05

0,1

0,15

0,2

1 921 1841 2761 3681 4601 5521 6441 7361 8281 9201

ground signal

-0,08

-0,06

-0,04

-0,02

0

0,02

0,04

0,06

0,08

0,1

0,12

1 919 1837 2755 3673 4591 5509 6427 7345 8263 9181

Ground connection not the best possible (not yet the final layout).

Ground noise well within CM range.

Difference signal immune from ground noise

difference

-0,1

-0,05

0

0,05

0,1

0,15

1 229 457 685 913 1141 1369 1597 1825 2053 2281 2509 2737 2965


FEB status

Prototype (almost) finished. 10 prototypes will be mounted in the

next few weeks, to be tested at the INFN-Napoli test stand with the Controller.

Tender for the mass production (~500 boards) awaiting for test results.


Controller status

Prototype finished, without “Mezzanine”.

Tested at INFN Napoli with a FEB emulator.


HV system

3 SYS-127 (available). 33 (4 ch.) positive modules (available). 11 (4 ch.) negative modules (available). 8 (~40 ch. each) I-meter (home made by

INFN-Frascati), almost ready.


RPC & XPC cable layout

3 + 6 boards x plane

6 + 6 boards x plane


Racks layout

16 Racks (old MACRO racks), with modification (water cooling and power management). Works in progress.


Crates layout(for one spectrometer)

RADIATORERADIATORE

RADIATORERADIATORE

Power Management

Power Management

SYS 127 +

CONTROLLER

RPC

RPC

RACK 6 RACK 8

I Meter

RADIATORERADIATORE

RADIATORERADIATORE

RPC

RPC

RPC

RPC

I Meter

I Meter

I Meter

SYS 127 -

Power Management

Power Management

RACK 5 RACK 7

SLOW CONTROL

RADIATORE RADIATORE

RADIATORE RADIATORE

Power Management

Power Management

XPC

CONTROLLER

RPC

RPC

I Meter

I Meter

I Meter

I Meter

SLOW CONTROL

RACK 4RACK 2

RADIATORE

SYS 127 +

RADIATORE

RADIATORE RADIATORE

RPC

RPC

RPC

XPC

TIMING

Power Management

Power Management

RPC

RACK 3RACK 1


Custom Crates(FEBs and Controllers)

Standard VME crates, with custom backplane.

4 crates for XPC 24 crates for RPC 4 crates for Controllers


Custom Crates


All the crates and backplanes are already available; mounting in progress.

Flavio Dal Corso - INFN Padova1 OPERA coll. meeting - Hamburg 3 July 2004 RPC & XPC Electronics...

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