The reasons behind this measurement

1
The KLONE proposalMeasurement of reconstruction
efficiency with the KLOe emc of NEUtrons

• The reasons behind this measurement
• First look at full simulation results ..
• Planning of a test beam on n source
• - TSL
• Planning of n-efficiency measurement

Stefano Miscetti LNF INFN For the KLONE TB group
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The reasons behind it (I)
A lot of interest is growing on knowing the
efficiency of the KLOE EMC on
detecting/reconstructing neutrons

• A) The instrumental reason.
• - The KLOE EMC has proven to be a wonderful
  calorimeter.
• - The best time resolution so far in the
  world, excellent photon efficiency for low
  energy photons, good energy resolution.
• - It has run, with 4880 x 2 readout channels,
  without any fault for 7 years in a stable and
  calibrated way
• - It has good PID capability in conjunction
  with DCH for e/???
• - Nobody knows the response/efficiency for
  neutrons.
• Response for protons under way with our
  own KLOE data

If high efficiency is found --gt
SAVING, EASY and ROBUST n detector!
3
The reasons behind it (II)
Relevant for future experiments at LNF. At least
two LOI requiring good n-efficiency B)
AMADEUS Search of deeply bound kaonic
states. 4pi-detector looking for strange
tribaryon - n efficiency relevant C) DANTE
( KLOE2) measurement of the nucleon form
factor The interesting energy rangefor the
measurement - Kinetic energy from close to
threshold (10 MeV) to 200 MeV
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A fast road-map to KLONE

• An answer to this question has to be given
  a.s.a.p.
• to respond to INFN interests.
• A fast Road-map ??
• Find the people . OK
• Find the calorimeter OK
• Find the DAQ /Readout stuff .. In progress
• Find the Test Beam Area . OK
• Organize the measurement . In progress
• All of the above keeping in mind to make it in
  the best
• way without spending too much money.

5
The KLONE people

• A choral positive response of KLOE EMC group
• ( ?15 people from LNF,Rome1,Rome3) proud of
  their detector possibility for the future
  playing a very positive feedback.
• AMADEUS people pushed a lot for this measurement
  
• since beginning of February (5 people)
• In April we decided to freeze the fast growth of
  the group at the
• Level of 20 people in order not to explode.
• Results will obviously be public (hopefully
  published) and used
• for any possible LOI at LNF/wherever.
• I was proposed by F. Bossi and by other KLOE EMC
  experts to lead the team for the Test beam.

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The KLOE EMC prototype

• The KLOE EMC is a lead-scintillating fiber
  calorimeter
• with 1mm diameter fiber embedded and glued inside
  
• thin grooved lead foils (0.5mm)
• Peculiar triangular structure of fibers
  positioning
• to maximize the sampling --gt good energy
  resolution
• Composite has a volume ratio of
• PBscint/glue of 424810
• Final density 5 g/cm3, X0 1.5 cm. Full stack of
  
• 200 layers (23 cm depth) is equivalent to 15
  X0.
• Fibers allow to maximize the time resolution
  and at the
• Same time allow to build long calorimeter

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Calorimeter details (I)

• Readout at both ends, PM
• HamamatsuBurle, HV neg
• Large dynamic range
• 3x6 cells (4.4x4.4) in one side
• 3x4 cells (4.4x4.4) 2 back side PM
• Winston cones as in final design
• Longitudinal size 50-60 cm
• Already positioned in a stable
• support (and rotating) frame

8
Calorimeter details (II)
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HV FEE DAQ Offline
MINIMIZE cost by using old/unused electronics

• LNF already provides HV supply (SY127)
• most of the Lemo cabling (15 m x 40 )
• NIM electronics for splitting /discrimination
• of signals from LNF pool.
• VME DAQ relevant for a fast acquisition (200 Hz
  of 80 channels)
• Needs
• - VME crate
• - ADCTDC boards for 40 PMs
• - IO register for BUSY
• - CPU
• Already coming from LNF KLOE ROMA3
• Desktop for data-acquisition monitoring (PAW)
• ----- A dismissed user PC of LNF.

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Full simulation of the KLOE calorimeter
Old simulation LeadSci-fibres layers GEANT3
fluka upgrade will allow to use combinatorial
geometry to design a trapezoidal structure?
FLUKA simulation
Using lattice tool the fibre structure can be
easily designed.
PLA
replicas
base module
LEAD
198 fibres
200 layers
GLUE
FIBRES
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Comparison of ? response in MC with data
Energy response
Z-position resolution
linearity response well reproduced, Energy
resolution OK
Resolution OK
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Response for n with full simulation
Full simulation of lead/fiber structure done
with FLUKA both by KLOE and AMADEUS
collaborations. A large detection efficiency
expected contrary to common understanding -
fiber amount is equivalent to 10 cm of Ne110.
- basic rule efficiency 1/cm --gt projection of
10 - Amplification of longer path due to
elastic scattering on Pb observed.
Path length amplified x4-6 --gt Efficiency
40-60 !?
13
Tkin 256 MeV
MC example of n trajectories in KLOE EMC
KLOE full detailed Lead/fibers geometry
KLOE dimensions only scint
14
Efficiency curves as a function of momentum
without birks effect
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MonteCarlo simulation - Calorimeter response
Neutron detection efficiency
Threshold at 1 MeV Threshold at 3 MeV
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TSL Source summary (BLUE HALL)

• Both TSL (Uppsala) and Louvain sources look
  reasonable.
• Louvain cannot be used before 2007.
• Approval for TSL OK
• 0) n are produced with pLi7 3 m collimator
• sweep magnet
• 1) n-Energy peaked at Cyclotron energy low
  energy tail
• 2) The n timing is phase-locked to main
  Ciclotron RF
• with narrow pulse duration (TOF) ?tof
  1.5-3 ns
• 3) Absolute flux measured at the last collimator
  (?25 kHz)
• 4) Beam intensity monitor at a level of 10
  available
• 5) Beam spot increases almost linearly with
  distance from
• target ( circular with 3 cm diameter)
• Simulation study under way to optimize Distance
  vs TOF

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BLUE Hall and TSL n source

KLONE setup

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Actions at TSL so far

• 15-16 May 2006
• visit at TSL and discussions with TSL staff
• - beam quality vs efficiency measurement OK
• Blue Hall and possible positioning of setup OK
• Control room availability OK
• Participation and support from TSL staff - OK

• We also learnt technical information on the BEAM
• time structure
• Cyclotron clock 50 ns period,
• A macro structure of filled clocks 700 msec wide
  
• (R_macro200 Hz)
• Rn 25 khZ, filling of 1 n each 1/140 clocks

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KLONE project at TSL

• - approved on 18/05/2006 ? code F183 assigned
• beam time allocated
• Oct 2006 week 42 and 43
• (180 MeV energy range)
• 8 shifts of 8 hours assigned
• half of this paid on TARI
• cost of 400 Euro/hour!

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Data taking planning

• OBJECTS
• - 1 KLOE Calorimeter (CALO) -------gt
  effi 50 ??
• 2 ref. NE110 scint S1,S2 (20x10x5 cm2) -gt
  effi 5
• PMON (long scint. counter for beam pos monitor)
  --gt effi lt1
• TRIGGER the OR of 4 triggers
• Analog sum of CALO sides A,B
• Tr1 (CalSumACalSumB)Clock
• Tr2 (S1AS1B)Clock
• Tr3 (S2AS2B)Clock
• Tr4 (PMON)Clock
• 1) Rate measurement of n in full acceptance
  as
• tested by PMON vs TOF (ie Tkine)
• 2) Triggering on the first n on
  Macro-structure
• 3) Different configurations of detectors
  possible.

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Data taking planning
---gt ---------
CALO
collimator
S2
PMON
P Target
S1
Standard calorimeter distance 8 m from target,
as a compromise between TOF precision and beam
spot size. Typical running PMON CALO or
PMON s1,s2 close SPECIAL
CONFIGURATIONS S1 S2 CALO CALO
S1S2 S1 ------ S2 FAR CALO
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Financial requests

• Financial contribution to 25 hours
• of running at TSL 10
  kEuro
• Two NE110 Scintillator counters
• 4 readout PMs (42 kEuro)
• 2 Disks USB 250 GB ( 1
  kEuro)
• New HV divider for mesh PMs x15 ( 2
  kEuro)
• Consumi
• missioni
• (missing cable, usage of LNF pool,
• mechanics,packing for transportation) (3
  kEuro)