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Status report di LHCf
O. Adriani
Trieste, CSN1, 19 Settembre 2006
• Assemblaggio dei detectors
•Test beam
•Programma dell’installazione (2007)
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
The direct measurement of the p production cross section as function of pT is
essential to correctly estimate the energy of the primary cosmic rays
(LHC: 1017 eV)
Simulation of an atmospheric
shower due to a 1019 eV proton.
Experimental Method:
2 independent detectors on both sides of IP
Detector I
Tungsten
Scintillator
Scintillating fibers
Detector II
Tungsten
Scintillator
Silicon mstrips
INTERACTION POINT
140 m
140 m
Beam line
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
The TAN and LHCf
box ~ (15×15×40) cm3
manipulator
marble
shielding
boxes for
DAQ electronic
IP1 (Atlas region) was definitely chosen in October 2005
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
ARM #1 detector
scintillating fibers
tungsten layers
- 2 towers (2.02.0cm2 and 4.04.0 cm2)
• ~47 r.l. (22  2.1 r.l. tungsten layers)
Energy
• 16 scintillator layers (3 mm thick)
- 4 pairs of scintillating fiber layers for tracking purpose
(two orthogonal directions)
19 Settembre 2006
LHCf – CSN1 Trieste
scintillators
Impact point (h)
O. Adriani
We used LHC style
electronics and readout
silicon layers
ARM #2 detector
- 2 towers (2.52.5cm2 and 3.53.5 cm2)
• 44 r.l. (22  2 r.l. tungsten layers)
• 16 scintillator layers (3 mm thick)
- 4 pairs of silicon microstrip layers for
tracking purpose (X and Y directions)
Energy
Impact point (h)
See TDR for details…
scintillators
tungsten layers
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Development of showers in Arm #2
E γ= 500 GeV
Fluka based
simulation
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Monte Carlo g ray energy spectrum
(5% Energy resolution is taken into account)
106 generated LHC interactions 
1 minute exposure@1029 cm-2s-1 luminosity
Discrimination between various models is feasible
Quantitative
discrimination with
the help of a
properly defined c2
discriminating
variable based on the
spectrum shape
(see TDR for details)
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Where we are with Arm1?
• Arm1 was fully assembled in Japan in July 2006
(scintillators + fibers + Tungsten) and brought to CERN
for the Beam Test
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Where we are with Arm2?
• Plastic scintillators + Light guides + Tungsten:
– Production in Japan finished in July 2006
– They were brought in Florence end of July
• First Silicon module (Milestone INFN):
– Production in Florence finished in July 2006
• Assembly of Arm2:
– It was done in Florence in August 1-15
• Arm1 was brought at CERN for the beam test on August 16, 2006
– Please note:
» Arm1 is completed
» To complete Arm2 3 more silicon moudules are needed
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Plastic scintillators + Light guides + Tungsten
Florence clean room (thanks to CMS!!!!!)
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
25 mm
The mechanics of the module
Light Guides
+
Scintillators
Pace Chips
Silicon sensor
SiliconX SiliconY
19 Settembre 2006
Hybrid circuit
Kapton fanout
Tungsten
LHCf – CSN1 Trieste
O. Adriani
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
The birth of Arm2
Silicon module: 12 X0
X and Y sensors
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Readout electronics
LHC style electronics
(Many thanks to CMS!!!!)
DOH
GOL
CCU
PLL
QPLL
…
PACE3 chips (CMS preshower)
We have developed
•Hybrid circuit (Left+Right)
•Mother Board (Logic)
•Adc Piggy Back board
DAQ: GOL + Gbit ethernet
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
The hybrid and the cables
PACE3
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
The readout and ADC boards
ADC
CCUM
QPLL
PLL
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
•
•
•
•
Beam test @ SPS
Arm1 & Arm2 were delivered to Cern on August 16, 2006
They were set up for the beam test
Beam period: August 28, September 4
H4 Test Area
– Electrons up to 200 GeV
– Protons up to 350 GeV
– Muons
• Goal of the test beam:
– Energy calibration of the calorimeter
– Measurement of the spatial resolution of silicon system
• Florence telescope (ADAMO) is used to precisely
reconstruct tracks
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Few plots of the beam test results…
A high energy electron shower seen on x and y
silicon
X
Y
<Noise> ~ 5 ADC counts
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Y
Beam profile
200 GeV electrons
19 Settembre 2006
X
LHCf – CSN1 Trieste
O. Adriani
Y
Energy measured
200 GeV electrons
Low Gain
19 Settembre 2006
LHCf – CSN1 Trieste
X
O. Adriani
Y
Energy measured
100 GeV electrons
High Gain
19 Settembre 2006
LHCf – CSN1 Trieste
X
O. Adriani
Y
Energy measured
350 GeV protons
High Gain
19 Settembre 2006
LHCf – CSN1 Trieste
X
O. Adriani
Future plans for the installation:
Arm1
• Arm1 is now in Florence
• TAN for Arm1 will be ‘baked’ in November
2006 (heating up to 200 0C!!!!)
• Arm1 will be brought at Cern in January
2007 for the final installation in the TAN
(2/3 weeks)
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Future plans for the installation:
Arm2
• Arm2 is now in Florence
• Production of the silicon modules will finish before the
end of the year (Milestone INFN)
• Arm2 will be deassembled and reassembled again before
end of february 2007 with all the silicon modules
• Pre-installation of Arm2 in the TAN  April 2007
• Baking up of the Arm2 TAN  after summer 2007 
Arm2 should be removed after pre-installation!!!!
• Final Arm2 installation Fall 2007
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Milestones
•
•
•
•
50% of the silicon modules: 31/12/2006
100% of silicon modules: 28/02/2007
Pre-installation in the tunnel: 30/06/2007
ata taking with 450 GeV + 450 GeV protons:
31/12/2007
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
SPARES
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Transverse projection
of detector #2 in the TAN slot
Maximization of the acceptance in R (distance from beam center)
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
Position resolution of Arm #2 calorimeter
7 mm for 1.8 TeV photons
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
p0 geometrical
acceptance
Arm #2
Arm #1
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani
p0 mass resolution
Arm #1
DE/E=5%
200 mm spatial resolution
Dm/m = 5%
19 Settembre 2006
LHCf – CSN1 Trieste
O. Adriani