Status Report

1
RPC
Status Report

• Gran Sasso - system test facility
• - RPC under test
• - automatic push test table
• RPC tests in Padova
• RPC tests at CERN -gt Dario Autiero
• Mechanics
• Electronics
• Situation on Production

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Cosmic rays tests

• A cosmic test station is being setup.
• Big involvement for the LNGS electronic and
• mechanical workshops.
• Trigger
• 2 planes (4?4 m2 each) using glass RPCs
• 1 cm strips (flat cables glued on polypropylene)
• 1st coordinate, digital readout (MACRO GSC
  cards)
• 2nd coordinate using time information (?t lt 50
  ps).
• Bakelite RPCs
• 3 boxes (12 ? 3) under test at once
• use MACRO readout strips (3 cm) for both coord.
• digital readout (MACRO GSC).

m
Boxes
3
LNGS infrastructures

• Experimental hall free for OPERA
• On-going process for the gas system (4
  independent distribution point inside the hall
  gas mixed inside) ? October 2002
• backup solution for gas ready for end of June
• Trigger planes
• Mechanical structure finished
• RPCs glass delivered, ended to assemble the
  detectors (16 m2)
• electronics for t1-t2 tested, final production
  started.
• RPC under test
• measures fixed, 2 box prototypes ready -gt OK
• Strip pannels prototypes ready
• card for signal inversion (HV 4kV) under
  assembling.

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LNGS infrastructures (2)

• DAQ under development, it uses a system similar
  to that currently used for MONOLITH prototype and
  for GSC-II project), started to test with the
  OPERA RPC prototypes available at LNGS.

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Front End cards for GLASS RPC
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for example time resolution
jetter measured in lab over 8 channels from
pulser, 100x20 mV2
50 ps/bin
Resolution less than 50 ps
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Pannels and FE cards for RPC under test
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Strip Pannel for TEST and RPC chamber
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System Test assembled
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TEST at Gran Sasso with first three RPC 11
prototypes
Plastic scintillators for Trigger
cosmics ray
RPC
11
atmosferic preassure corrected
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corrent over rate -gt charge
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as a function of the threshold
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with other lectures
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Push test results
One tested chamber had several unglued spacers
(no glue on one side was find after having opened
the chamber. The final test will be
completely automated, reducing the operator time
and improving the sensitivity of the test.
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Automatization done by ROME technician with
expertise from ATLAS, LHCB
this is the solenoid to brign up the weights nn
the single spacer
Work to be finished for June
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• All the chain (including DISPLAY of events) has
  been tested with the three RPC prototypes
  available from april.

• System test under full control for July with the
  38 new RPC pre-production chs

• READY to check RPC chambers from September 2002

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MECHANICS

• drawings of frame and culla for installation
  done
• tendering on the way on
• few offers already obtained

• discussion with Frascati engenieers (24 May)
• to integrate RPC installation and magnets

• 2 prototypes for the transportation boxes done.
  Almost ok.

• Full prototype for strips (1 full layer in x and
  1 in y) for end July

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ELECTRONICS
New Front-End card ready (2nd prototype) - 64
channels - differential receivers exaustively
studied (good response until 5 mV) - Zin 100
? - input polarization for at least two
samples - threshold tunable 0 300 mV for
groups of 16 channels - mask single input -
digital test-in - FastOR over 16 channels 1 ms
long, TTL output at 50 ? - generation of
interrupt on the FastOR - external trigger/gate
for all the channel. TTL output at high Z -
double buffer for the events - VME read-out
Tried first contact with DAQ people (!) Need real
meeting -gt in Padova around 8 10 July
More people are probably to be involved (Gran
Sasso, Napoli)
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RPC PRODUCTION

• In the period January April situation of
  crisis due to bakelite not glueing anymore (!)
• It seems over
• Original production plan out-of-order
• Start to elaborate a new production plan, to be
  stated next Friday, June 14th in Rome
• For OPERA, 300 chambers seem foreseen in the
  period September December 2002
• 700 chambers in the period
  January December 2003
• If INSTALLATION starts in February 2003, we are
  JUST IN TIME !

500 chambers are necessary for one
Spectrometer Each Spectrometer has to be
installed, together with RPCs in 6 months
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Summary
(most solid and sure floor, but something is
vague)

• System test at Gran Sasso very well in time and
  succesfully set-up
• RPC pre-production will allow complete test of
  the system for end of August
• Many tests on the full scale RPC prototypes -gt
  good results
• Mechanics on the way on. First prototype for
  installation end of July
• Electronics well suited. Need FE DAQ
  integration. More people are coming
• Production for OPERA at General Technica tight
  but acceptable.

• Confidence in RPC capability on the long term