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LED calibration systems for CALICE hadron calorimeter

LED calibration systems for CALICE hadron calorimeter. Outline. Calice prototype SiPM Motivation ( SiPM issues, temeperature drift..) AHCAL 1m^2 solution Electronics solution performance Embeded solution Electronics solution Performance Quasi-resonant LED driver

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LED calibration systems for CALICE hadron calorimeter

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  1. LED calibration systems for CALICE hadron calorimeter TIPP 2011, Chicago

  2. Outline • Calice prototype • SiPM Motivation (SiPM issues, temeperature drift..) • AHCAL 1m^2 solution • Electronics solution • performance • Embeded solution • Electronics solution • Performance • Quasi-resonant LED driver • Electronics solution • Performance • Light distribution TIPP 2011, Chicago

  3. Calice 1m2 prototypeToDo HCAL TCMT HCAL TIPP 2011, Chicago 20mmFe platesand scintillators ECAL 90 cm 3 cm 1 mm

  4. SiPM Issues – need for Calibration ToDo • Obrazek – vysecsnimace, Danilov-experimenty?? • Jaravlivynasaturacniprubeh – cas, zpozdenisvetla, cas do nabiti… TIPP 2011, Chicago

  5. TIPP 2011, Chicago Particle detection MUONS LED light

  6. CMB-TBD • El. Zapojeni, simulace TIPP 2011, Chicago

  7. CMB-results ToDo • Jara’s calibration plots, SPS, etc. TIPP 2011, Chicago

  8. Integrated LED system LEDs • Developed by DESY and Uni Wuppertal • Each Tile has its through-hole mounted LED • Each LED has its own driver circuitry. • Operation: The current pulse though the LED is generated by discharging of the Capacitor by a fast transistor • V-calib signal range: 3–10 V • System tuned for ~8 ns pulses • Choice of the LED is critical for this driver • Several different LED types were tested (see next slide) • The technology of the LED is most important • Only Single-quantum-well LEDs work well (usually UV-LED) • Other (multi-quantum-well) LEDs have too big capacitance and produce longer optical pulse (with low-intensity “tail”) • Driver circuitry is now optimized and being manufactured on the new HBU for the technological prototype 5 ns TIPP 2011, Chicago

  9. Integrated LED system – Optimization • Pulse of the Blue LED is much wider (~40 ns), than the UV LED (~5 ns) • Light pulse width re-measured with a differential driver • In this mode: LED is reverse biased, then for a short pulse forward biased and directly reverse biased again • The reverse voltage helps to discharge the LED • BlueLED stops shining much faster Blue LED Blue LED, differential UV LED TIPP 2011, Chicago

  10. Integrated LED system – SPS • For longer (>30 ns) pulses, both UV and Blue LEDs produce equal optical pulses • Observation: UV LED have much steeper rise time • Driver circuitry is now optimized and being manufactured on the new HBU for the technological prototype • Question: is short pulse necessary? • Answer: Yes, 15 ns pulses and faster produce decent Single Photon Spectra • Single Photon Spectrum (SPS) • Short pulse -> improvement of the quality • Nice spectrum with UV-LED • Spectrum is more smeared with blue-LED • Light yield of the integrated LED Blue LED, 30 ns UV LED, 7ns Blue LED, 15ns TIPP 2011, Chicago

  11. Integrated LED system – Light Yield • Measurements with key components variation • Circuitry was finally tuned to deliver ~2K (12K???) effective pixels • Light referenced to PMT signal • ~500 pixels were fired (saturation) • Time behavior of the LED • Without tile: sharp pulse • With tile (and Wavelength shifting fibre)  long tail 25 ns With Tile Resistorvariation Capacitorvariation TIPP 2011, Chicago

  12. QMB6-ToDo TIPP 2011, Chicago

  13. QMB6-ToDo TIPP 2011, Chicago

  14. Notched Fibre • 24-notched fibre at the left figure. Illuminated by a green laser • Light is emitted from the notches • The notchis a special scratch to the fibre, which reflects the light to the opposite direction • The size of the notch varies from the beginning to the end of the fibre Emission from the fibre (side view) First notch Middle notch End position notch TIPP 2011, Chicago

  15. Optical fibre • Measurements of the light yield • Through the 3mm hole on the PCB (FR4 with filled inner layer) • 3 positions of the notch according to the PCB thru-hole “start” position “middle” position “end” position TIPP 2011, Chicago

  16. Notchet fibers configuration • 72 zarezovavlakna – vysledky linearity • LED vyzarovaciprofil (smolda) • Konfigurace 3*24 zarezu HBU1 HBU2 HBU3 HBU4 HBU5 HBU6 TIPP 2011, Chicago

  17. Development of new Quasi-resonant driver (QMB1) • QMB1 (1-chanel LED driver): • Fixed • Topology • Communicating bus (CAN) • CPU (Atmel AVR) • Trigger distribution (LVDS) • Trigger delay canbe tuned by C trimmer (~10ns) • Free to adjust: will be discussed at DESY in July calib meeting • Mounting holes (fixation to support/HBU • Fibre(LED) position • Set of notched fibers, semiautomat machine under development • Set: 3*fibre with 24 notches, creating a line of 72 notches. • 3 sets will be delivered TIPP 2011, Chicago

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