First developments of DAQ/Trigger for RPC

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First developments of DAQ\Trigger for RPC 30
October, 2002

• General layout of OPERA DAQ\Trigger
• Naples activity
• Conclusions

Naples RPC Groups Michelangelo Ambrosio, Lucia
Consiglio, Adele Di Cicco, Giovanni Sorrentino In
collaboration with the Naples SER group.
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• FEB developed in Padova
• 64 channels\board, divided into 2 groups of 32
  channels

• Padova Front End Boards ( 9 / plane )
• Controller boards (22 / spectrometer)
• Trigger (or validation) board (1 / spectrometer)

• Vertical strip (2.6 cm) 334/plane
• Horizontal strip (3.5 cm)228/plane
• Total strip 562/plane

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Frascati, 30 Ottobre 2002
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• Sets up thresholds, mask, polarity, etc through
  serial link.
• Receives data and individual ORs from FEBs.
• Performs Plane OR and sends it to the trigger
  board.
• Performs data compression and data formatting
  (Zero suppression)
• Board housed in a VME crate
• (Links the time stamp to data)

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FE Controller (Mask, Polarity, Threshold)
Readout control
Oscillator
clock
Validate trigger
FPGA
Controller Ethernet Board
FIFO
FE readout
Compressed Data
FAST OR readout
Plane OR to trigger
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Word structure inside FIFO
Chain number
Cluster Address
Cluster size
5 bits
3 bits
10 bits
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ADD31
ADD 0
0
0
1
1
0
0
0
1
1
1
1
0
0
0
1
0
0
0
0
Chain 0
ADD31
ADD 0
0
1
1
1
0
0
1
0
0
0
0
0
0
0
0
0
1
1
1
Chain 1
ADD 0
ADD31
0
1
1
0
0
0
0
0
1
1
1
0
0
0
0
1
1
0
0
Chain 5

• Vertical strip (2.6 cm) 334/plane
• Horizontal strip (3.5 cm)228/plane
• Total strip to address 562/plane

• 5 bit for channel number (max 32)
• 10 bit cluster address (max 1024)
• 3 bit cluster dimension (7 consecutive strips
  fired)

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• Receives data from Controller boards (22 Plane
  OR)
• Performs majority between planes selected by the
  user
• Produces pattern of active planes
• Produces signal of validate trigger
• Receives GPS clock and sets time stamp for each
  event to be read out

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At the present the setting of time stamp for each
event has been planned to be done on each
controller board. This is due to the original
layout in which the FEB acquisition is
asynchronous (free running no trigger). The use
of a trigger signal allows the definition of the
trigger event time WE SUGGEST TO ASSIGN THE
TIME STAMP TO THE TRIGGER TIME. This solution
allows the event building by reducing the needed
information and the time stamp electronics from
22 to only 1
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• Reads the time stamp from the trigger board
• Reads the trigger pattern from the trigger board
• Reads data from the controller boards of
  triggered planes only

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• Controller prototype
• Trigger prototype
• Local RPC test facility
• Local DAQ system

In addition the group is involved in the RPC test
in LNGS
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• Accepts up to 32 Fast ORs
• Performs the plane ORs for the trigger board
• Accepts the validation signal
• Reads up to 32 chains of max 1024 strips
• Performs the Zero suppression
• Writes data on FIFO

• 5 bit for channel number (max 32)
• 10 bit cluster address (max 1024)
• 3 bit cluster dimension

• First of all we have modified an ARGO controller
  according to our requests
• Before Christmas we will complete tests on this
  first prototype
• An OPERA prototype will be produced within March
  2003

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4 of 20 input connectors (only 8 for channel and
8 for ORs are available).
Controller Core
VME interface
FIFOs
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We are working on the following requirements

• Majority of selected planes
• Possibility to impose fixed planes
• Pattern of fired plane

Prototype expected in March 2003 at the moment
the trigger board is not necessary to test the
controller board
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• Vertical telescope (16 planes)
• With two horizontal veto planes

bakelite RPC 1 x 2 m2

• Horizontal telescope (6 planes)
• for electronic test

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The EXOTIC group in Naples developed a data
acquisition system based on VME bus very similar
to the system proposed for OPERA. They agree to
support us for installing a DAQ system for
acquisition of test telescopes in Naples.

• Data acquisition by VME bus
• Use SBS 618 VME controller
• Collaboration with Nuclear Physicists ( EXOTIC
  group )

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• We are collaborating to the RPC test in LNGS

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• The Naples group is involved in the development
  of RPC readout
• electronics in collaboration with Lion and the
  rest of RPC group.
• The controller prototype is under electrical
  test. Results expected
• before Christmas.
• The trigger board is expected within March 2003.

Frascati, 30 Ottobre 2002