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The reasons behind this measurement First look at “full” simulation results ..

The KLONE proposal: Measurement 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

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The reasons behind this measurement First look at “full” simulation results ..

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  1. The KLONE proposal:Measurement 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

  2. The reasons behind it … (I) 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 A lot of interest is growing on knowing the efficiency of the KLOE EMC on detecting/reconstructing neutrons: If high efficiency is found --> $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

  4. 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.

  6. 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 --> good energy resolution • Composite has a volume ratio of PB:scint/glue of 42:48:10 • 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

  7. Calorimeter details (I) • Readout at both ends, PM • Hamamatsu+Burle, 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)

  9. 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 - ADC+TDC 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.

  10. Full simulation of the KLOE calorimeter Old simulation: Lead–Sci-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

  11. Comparison of  response in MC with data Z-position resolution Energy response linearity response well reproduced, Energy resolution OK Resolution OK

  12. 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 --> projection of 10 % - Amplification of longer path due to elastic scattering on Pb observed. Path length amplified x4-6 --> Efficiency 40-60 %!?

  13. MC example of n trajectories in KLOE EMC Tkin = 256 MeV KLOE full detailed Lead/fibers geometry KLOE dimensions only scint

  14. Efficiency curves – as a function of momentum without birks effect

  15. MonteCarlo simulation - Calorimeter response Neutron detection efficiency Threshold at 1 MeV Threshold at 3 MeV

  16. 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 p+Li7 + 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

  17. BLUE Hall and TSL “n” source KLONE setup

  18. 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_macro=200 Hz) • Rn = 25 khZ, filling of 1 n each 1/140 clocks

  19. 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!

  20. Data taking planning • OBJECTS: • - 1 KLOE Calorimeter (CALO) -------> effi = 50% ?? • 2 ref. NE110 scint S1,S2 (20x10x5 cm^2) -> effi = 5% • PMON (long scint. counter for beam pos monitor) --> effi <1% • TRIGGER: the OR of 4 triggers • Analog sum of CALO sides A,B • Tr1: (CalSumA+CalSumB)*Clock • Tr2: (S1A+S1B)*Clock • Tr3: (S2A+S2B)*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.

  21. Data taking planning ---> || --------- | || || [ CALO ] “collimator” S2 PMON S1 P Target 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 + S1+S2 S1 ------ S2 FAR + CALO

  22. Financial requests: • Financial contribution to 25 hours • of running at TSL 10 kEuro • Two NE110 Scintillator counters • + 4 readout PMs (4+2 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)

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