Diapositiva 1

1
MRPC Station at LNF

• Works with schools
• Seminaries
• Measurements
• Construction
• User manual for students
• Test in progress on the LNF cosmic ray station
• Efficiency with and without gas flow (one side)
• Left vs Right Efficiency (two sides)
• DAQ setting up (preliminary)

Silvia Miozzi LNF-INFN
2
School planning

• Lessons on
• Cosmic ray physics 1 (16/12/2005) G. Di
  Sciascio
• 2
  (21/12/2005)
• Students experience at Cern (21/12/2005) Claudia,
  Damiano, Elisa
• Detectors (March) S. Miozzi
• MRPC (April) G. Bencivenni
• MRPC construction at Cern
• 8/01/2006 14/01/2006 Istituto Villa Sora (2
  MRPC)
• 15/01/2006 21/01/2006 ITIS Fermi (2
  MRPC)
• 22/01/2006 28/01/2006 Liceo Touschek (2
  MRPC)
• Open day
• Poster
• User manual
• Test and measurements with cosmic rays telescope
• At LNF (since February)
• At school (the first week of June if everything
  is ok)

will be uploaded on Centro Fermi web site
3
EEE set up
4
Trigger
SC1

• not self-triggering mode but external trigger
  by scintillators

50 cm
SC2
SC3
5
Gas system
OUT
19
13
IN
15
Total flow 40cc/min
C2H2F4 95 SF6 5
6
Coincidence scheme for efficiency measurements
(SC123)
SC1
(SC123) AND 19
19
SC2
13
(SC123) AND 13
(SC123) AND 15
15
SC3
7

8
Working point for test without gas flow
18,5 KV
9
Efficiency without gas flow

• 23/12/2005 at noon gas is off
• We start a new measure at 18,5KV
• 9/01/2006 we stop the measure
• The integrated scintillators counts on 17 days
  are 226021 and the resulted efficiencies for the
  three chambers are
• MRPC15 96,0 0,2
• MRPC13 94,4 0,2
• MRPC19 92,3 0,2

10
Chambers efficiency at 18,5 KVafter 17 days
without gas flow

• without gas
  with gas
• ( 0,2 )
  ( 4 )
• MRPC15 96,0 96
• MRPC13 94,4 97
• MRPC19 92,3 96

• Within the errors data match
• Differences among the chambers are evident and
  could be due to previous gas
• contamination correlated with the gas flow
  direction from 15 to 19.
• Further checks must be done
• inversion of the gas flow
• FEE exchange
• A long term measurement with gas flow is needed

11
Before and after 25 days gas off
Chambers seem to work quite well also without
gas. Of course the small differences among the
three chambers have to be studied in details
12
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13
Gas on again
Chambers still work after asphyxia!
14
FEEs equalization control
15
DAQ SETTING UP

• Read-out system

16
DAQ scheme
TRIGGER
BRIDGE
TDC1
Needed because, taking into account for the TDC
clock (40 MHz), time would be measured with an
uncertainty of 25ns
SYNCRONIZATION
TDC2
LEFT
RIGHT
17
TDC1 (left side) V1190 A
96 112 127
32 55 63
Ch
13
strip
1 24
64 87 95
0 23 31
Ch
19
15
1 24
strip
1 24
syncronization
Left
Right
Trigger
18
TDC2 (right side) V1190 A
96 112 127
32 55 63
Ch
13
strip
24 1
64 87 95
0 23 31
Ch
19
15
strip
24 1
24 1
syncronization
Left
Right
Trigger
19
TDC matching mode
20
TDC
preliminary Interface card
21
y-view along the strips
15
13
19
15
13
x-view
19
22
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23
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24
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25
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26
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27
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28
Work to be done

• High statistics to measure
• T0 from time spectra
• Strips transmission speed v
• From time spectra
• Direct measurement
• Implementation of the 2nd coordinate on on-line
  display (y-view)
• Spatial resolution
• Time resolution
• Implementation of the self-triggering

ch
DTL/v
t
T0
29
Waiting for the final set up..

• Gas system
• Mechanical structure
• HV CAEN 40 ch SY127
• LV standard
• Trigger standard NIM modules
• FEE cards
• Amphenol cables
• Interface cards
• DAQ systemVME Mini Crate
• Crate controller V1718
• 2 TDCs V1190 A CAEN 128ch
• Personal Computer

Preliminary Final
We have our President Carlo Azeglio Ciampi for
the opening June the 2nd