1 / 22

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

bly
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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)

More Related