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APD, Introduction Victor Rykalin

APD, Introduction Victor Rykalin. Content. APD Electronics Power supply Box Final table Recommendations. Compact Insensitive to magnetic field Higher QE over wider spectral range faster, shorter transit time cheaper simpler gain calibration. Smaller sensitive area

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APD, Introduction Victor Rykalin

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  1. APD, IntroductionVictor Rykalin

  2. Content • APD • Electronics • Power supply • Box • Final table • Recommendations Victor Rykalin

  3. Compact Insensitive to magnetic field Higher QE over wider spectral range faster, shorter transit time cheaper simpler gain calibration Smaller sensitive area still noisier than PMT need smart preamplifier larger temperature dependence optical coupling nontrivial !!! APD and PMT advantages disadvantages Victor Rykalin

  4. APD (Classics) 100um .5 MRS, Si PM Victor Rykalin

  5. Vendors Victor Rykalin

  6. General • Gain 1.1 - 10E(6) • QE 12% - 85 % (500 nm) • Gain Temperature Coefficient (-15°to +40°) -1.5%/°C • Bulk current TC ( ------------ ) 9.6 %/C • Noise SQRT(I bulk) • Signal/Noise S/N= {(N2sig * G2 )/(Noise)2} • (Noise=Noise(T,C,G,time,F) • Noise2=Noise2(electronics)+Noise(bulk)2 • MIP, QE=80%, Nsig= 40 PE, G=150, =100 ns, T=25 C Ib = 1nA Noise(electronics)=2000e rms, S/N(150) ~ 2.7 est. S/N(150) ~ 1.5 real Victor Rykalin

  7. Gain HAMAMATSU Victor Rykalin

  8. Hamamatsu ~500 80 % 500 nm Victor Rykalin

  9. RMD Victor Rykalin

  10. RMD Victor Rykalin

  11. MRS or Si PM (there is no commercial information) • Gain 106 Victor Rykalin

  12. MRS or Si PMT and VLPC Victor Rykalin

  13. Electronics • CMS(HCAL) = 0.4mV/fq • 60 channels, 150 ns (base), ENC(20pF)~1000e rms Victor Rykalin

  14. Electronics • QP02 k = 7mV/fq • 32 channels, 40 ns (base), ENC(20 pF)=2000 rms Victor Rykalin

  15. Circuit suggestions for APD 1 Preamp. - HV Ground 2 +HV Preamp. Victor Rykalin

  16. Power supplies • Ripple (5 mV and less) • dIk=dU/R dIk=5 mV/5 k dIk=1uA dIb(signal)=50*0.8*500*q/10ns=>dIk(signal)= =320nA*B=32uA, 1/32*100 = 3% • J4-2p, J4-2n ------ HV, S7001 low voltage seems to be an appropriate approach. Victor Rykalin

  17. HV power supply • J4-2P and J4-2N from Matsusada Precision Inc. • 2P – positive 2000V, 2N – negative 2kV. Ripple of 2mV. 2mA output current. • Voltage regulated by multi-turn built-in potentiometer or remotely. • Recommended for APD. • Non-standard size. • Current price as of 3/26/2003 is $252.00 (on picture it’s the left unit) Victor Rykalin

  18. Low voltage power supply • S7-001 Herbach&Rademan power supply (www.herbach.com) • 0 - ±30V (positive and negative simultaneously, 0.5mV ripple RMS. Current limit 5A. • Regulated. Dual Panel meters. • Current price is $238.95 Victor Rykalin

  19. #13 Box • Low-cost – about $35 per each element or less • Allows good temperature control, as precise as 0.1 degree at around 20oC, • Performance and precision somewhat degrade at negative temperatures because the element will require a large current ( 5A) in that range, which is not easy to control. • This is an “artistic” representation of the box that will have APD inside and the box with pre-amplifier (which is not being cooled as of current scheme but the ability to do this has been integrated into this particular design). Victor Rykalin

  20. Final table * B. Dolgoshein An Advanced Study of Silicon PM ICFA IB 2002 **A. Bross et all. Fermilab FN 0733 2003 *** Rykalin V. NICADD presentation http://nicadd.niu.edu2002 Victor Rykalin

  21. Recommendations • HAMAMATSU QP02 S/N ~ 3 • RMD QP02 S/N ~ 10 • MRS or Si PM CMS(HCAL)S/N ~ 6 • J4-2P,2N High voltage,S7-001 low voltage • Box with Peltier pads cooling • Circuit 2 is our choice Victor Rykalin

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