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SIDDHARTA future precision measurement of kaonic atoms at DA F NE

SIDDHARTA future precision measurement of kaonic atoms at DA F NE. LNF SPRING SCHOOL "Bruno Touschek" In Nuclear, Subnuclear and Astroparticle Physics  Frascati (Italy),  May 17th - 21st, 2004. Florin Sirghi. Si licon D rift D etector for H adronic A tom R esearch by T iming

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SIDDHARTA future precision measurement of kaonic atoms at DA F NE

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  1. SIDDHARTA future precision measurement of kaonic atoms at DAFNE LNF SPRING SCHOOL "Bruno Touschek" In Nuclear, Subnuclear and Astroparticle Physics  Frascati (Italy),  May 17th - 21st, 2004 Florin Sirghi

  2. Silicon Drift Detector for Hadronic Atom Research by Timing Applications SIDDHARTA

  3. The obtained DEAR result: represents indeed the best measurement performed on Kaonic Hydrogen up to now BUT what we are aiming for is few eV precision measurement of kaonic hydrogen 1s level shift first measurement of kaonic deuterium in order to determine the isospin dependent KN scattering lengths at percent level precision

  4. SIDDHARTA Scientific Programme Kaonic helium measurement towards the study of deeply bound nuclear kaonic state.Other light kaonic atoms measurement (Li, Be…).Investigate the possibility of the measurement of other types of hadronic exotic atoms (sigmonic atoms).Charged kaon mass precision measurement.

  5. SIDDHARTA Collaboration LNF- INFN, Frascati, Italy IMEP- ÖAW, Vienna, Austria IFIN–HH, Bucharest, Romania Politecnico, Milano, Italy Max-Planck-Institute for Extraterrestrial Physics, Garching, Germany PNSensor GmbH, Munich, Germany RIKEN, Japan

  6. The choice of the detector • A good X-ray detector, which preserves • all good features of the CCD • large active area • quantumefficiency • energy resolution • linearity and stability • Trigger capability (fast shaping times – 1ms) for background rejection

  7. - V c c p + n n + The classical PIN (Positive-Intrinsic-Negative) diode detector Entrance window ANODE The anode capacitance is proportional to the detector active area

  8. The Semiconductor Drift Detector Entrance window ANODE The electrons are collected by the small anode, characterized by a low output capacitance. Anode Advantages:very high energy resolution at fast shaping times, due to the small anode capacitance, independent of the active area of the detector

  9. The Silicon Drift Detector with on-chip JFET • JFET integrated on the detector • capacitive ‘matching’: Cgate = Cdetector • minimization of the parasitic capacitances • reduction of the microphonic noise • simple solution for the connection detector-electronics in monolithic arrays of several units

  10. The integrated JFET Detector produced at Max-Planck-Institute for Extraterrestrial Physics, Garching, Germany

  11. Silicon Drift Detector performances Quantum efficiency of a 280 mm thick SDD 55Fe spectrum measured with a SDD (5 mm2) at –10°C with 0.5 ms shaping time

  12. SDD PIN Si(Li) 150 K 5.9 keV line 800 700 PIN Tsh=20us 600 500 FWHM (eV) 400 300 Si(Li) Tsh=20us 200 SDD Tsh=1us 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 A (cm-2) Spectroscopic resolution: detector comparison

  13. IK IA hn hn t IA tdr max t Timing with the anode signal

  14. Kaon trigger X-ray pulse Background pulse Triggered acquisition Kaontrigger Concidencewindows tdr max Detectedpulses Consideredpulses S/B = 5/1 Background reductions

  15. target cooling line feed-throughs for SDD electronics port for SDD cooling vacuum chamber SDD pre-amplifier electronics lead table SDD detector chip target cell beam pipe and kaon trigger SIDDHARTA setup version 1

  16. SIDDHARTA setup version 2 SDDs array Beam pipe e- e+ Kaon trigger Cryogenic target cell

  17. Kaon stopping distribution inside hydrogen target for a toroidal setup Signal: ~ 30 times more than in DEAR Kaons stopped inside target ~ 30% (all generated) MonteCarlo simulation

  18. SIDDHARTA Kaonic hydrogen simulated spectrum MonteCarlo simulation Precision on shift ~1 eV integrated luminosity 60 pb-1 S/B = 5/1

  19. SIDDHARTA Kaonic deuterium simulated spectrum Precision on shift < 10 eV S/B = 1/4 MonteCarlo simulation integrated luminosity 100 pb-1

  20. Test of the 30 mm2 SDD Detector biasing parameters

  21. T = - 40°C, tsh=0.75ms

  22. Conclusion Continuing tests of detectors Finalizing the design of the new experimental setup: front-end electronics,mechanics, cryogenics, vacuum 2006 Assembly of the setup on DAFNEand data taking

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