1. Août 09 ECAL EUDET Measurements of SKIROC Maurice Cohen-Solal

2. 25 sep 08 J. Fleury / M. C. Solal IN Calib. 8-bit DAC 0-5V SPIROC 15pF 1.5pF 0.1pF-1.5pF IN 3pF 50  100 nF + Switch low (Switch High) (Switch Low) (Voltage preamplifier) (Charge preamplifier) (Voltage preamplifier) SKIROC Low gain High gain SiliconPhotoMultiplier diode Silicon PIN diode SPIROC / SKIROC Schematic

3. 160 k  unexpected « parallel » noïse Parallel noise ? R equivalent = Dependance with Cf, Cc, Cin & no constant with  ?

4. noise vs Rp Rp

5. ENC measurements & simulation SKIROC SPIROC HG SPIROC LG SKIROC Slope serial noise: 64 (nV/  Hz * pF ) Slope serial noise : 78 (nV/  Hz * pF)

6. Jan. 10 M. C. Solal SKIROC Cdet = 25 pFCdet = 17 pF ( e n = 3 nV/  Hz ) Noise vs Cdet

7. ENC (effect of connexions) SKIROC I.C. Pistes PCB in C det 5 pF (estimation) ENC in + piste / ENC in +26 % soit 6.4 pF at 70 nsec +55 % soit 17 pF at 1 µsec C inj I.C. PCB I.C. PCB +60%+121%

8. Jan. 10 M. C. Solal SKIROC Cdet = 16 – 3 = 13 pF

9. Serial noise “ fit” 44 (nV/  Hz * pF) 33 (nV/  Hz * pF) SPIROC HG (disable LG) 32 (nV/  Hz * pF ) SPIROC LG (disable HG) (enable HG)(enable LG) 39 (nV/  Hz * pF) (enable LG) 64 (nV/  Hz * pF ) SKIROC (disable LG) 80 (nV/  Hz * pF) 78 (nV/  Hz * pF) Simulation (Cdet = 68 pF)

10. Nov. 09 SKIROC déficit DCOutput = 2.95 V (2.80V “measured”) DCInput = 2.58 V rise time 28 nsec simulation 48 nsec measured ( 2 nsec generator ) 300 fF Expected level -39% measured  v out -18% measured disable (LG) enable (LG) -15 % simulated -21% measured deficit 1.5pF Low Gain

11. preamplifier low pass high passNoisy resistor Qinj = 6.1 fC = 38 ke - 1 DAC Unit = 1.28 mV µ = 740.2 (D.U.)  = 2.2 (D.U.)  = 0.65 (fC) Counting vs DAC ( Labview ) ( In ) µ = 730.8 (D.U.)  = 1.8 (D.U.)  = 0.35 (fC) SPIROC SKIROC

12. preamplifier low pass high passNoisy resistor Counting vs signal ( scope ) µ = 730.8  = 1.8 Q inj (fC) Noise µ = 3.91 fC  = 0.40 fC = 2 474 e - µ = 2.93 fC  = 0.25 fC = 1 534 e - ( In ) SPIROC SKIROC

13. low pass high passNoisy resistor Counting Pedestal (stable) & signal 5.1 fC  = 0.51 fC  = 0.59 fC (DU)

14. preamplifier low pass Noisy resistor Counting vs Q inj (Labview) 3 698 e - low pass high pass 955 e - In (Ch 23) Pedestal value SPIROC SKIROC

15. noise of the discriminator SKIROC (minimum possible signal) summary preamplifier low pass Noisy resistor low pass noise (fC) 6.10.65 Labview counting vs DAC In 3.90.40 Scope counting vs signal In (no PC, no USB, no CLK) 6.50.44 Labview counting vs signal In ped0.59Labview (s+n) vs signal In ped0.61Labview (s+n) vs signal In 5.1 0.51 Labview counting vs DAC In (stable pedestal) 5.1 0.59 Labview counting vs DAC In (stable pedestal) 0.59 (  =0.08) fC ≡ 3 700 (  =500) electrons Qinj. (fC)

16. Qinj = 4.52 fC & Qinj = 4.57 fC 4.7 DU 3.8 DU (Ch20) 3.0 DU (Ch20, Ch28) Ped. (min –max) 5.0 DU 4.3 DU (Ch20) 4.0 DU (Ch20, Ch28) Ped. (min –max) (stable pedestal) The threshold of the trigger (red arrow) could be set at 0.52 MIP (2.1 fC).

17. Oct. 09 SKIROC pedestal stability (DAC value, V DAC ) (a)Power switch on (b)38 mn after (a) (c)Other test (d)Switch off (week-end) (e)Switch on (Monday) (f)5hrs 12mn after (e) (g)1hrs 55 mn break (h)At morning (cold) (i)3 hrs 39 mn break (j)2 hrs 40 mn break

18. Oct. 09 SKIROC pedestal stability (DAC, ibo_d iscri ) (a)Power switch on (b)38 mn after (a) (c)Other test (d)Switch off (week-end) (e)Switch on (Monday) (f)5hrs 12mn after (e) (g)1hrs 55 mn break (h)At morning (cold) (i)3 hrs 39 mn break (j)2 hrs 40 mn break

19. Oct. 09 SKIROC pedestal stability (DAC, V bandgap ) (a)Power switch on (b)38 mn after (a) (c)Other test (d)Switch off (week-end) (e)Switch on (Monday) (f)5hrs 12mn after (e) (g)1hrs 55 mn break (h)At morning (cold) (i)3 hrs 39 mn break (j)2 hrs 40 mn break 0.04 mV drift of the band gap shifts the pedestal value of 1 unit DAC.