ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague1 LED notched fibre distributing system QMB1 with HBU2 test Ivo Polák, on behalf of Prague’s group 1.QMB1 specifications 2.Test with HBU2 3.Analysis of light fibre distribution 4.Notched fibre, semiautomatic machine 5.Conclusions

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague2 QMB1 Quasi resonant Main Board –Modular system, 1 LED per board –Operation mode: DAQ + CANbus control stand-alone mode –LVDS Trigger distribution system –Variable amplitude, zero to maximum (~1Amp) smooth –Pulse width fixed to ~ 3.5ns (UV or blue LED) –Voltages and temperature monitoring –Size of PCB: width 30mm, depth 140mm More info of QMB can be found at previous presentations: Polak_I.CALICE_Heidelberg.pdf Single power 15V 65mA

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague3 Frame with 5 QMB1 boards (and 1 spare)

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague4 DESY test setup in February 2012 HBU2 DIF, PWR, CAL QMB1 T-calib from DAQ- DIF CANbus SPIROC2 PWR 15V combiner Notched fibres Single layer frame

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague5 Setup with HBU2 HBU2 (two SPIRoc2b ASICs) equipped with 3 rows of scintillators with SiPMs (delivered in Nov2011) 3 active QMB1s 3mm UV LED (395nm) 3x QMB1 Bad channels SiPM bias has not been set individually

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague6 detail of routed fibres We used TESA highly adhesive pads (for installation of banner to the wall) It is more stable than other temporary technique. We are developing stable fixing system. Fixing fibres to the right position is like Match of Ferda the ant with Bag the beetle…

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague7 Test at DESY HBU2 (two SPIRoc2b ASICs) equipped with 3 rows of scintillators & SiPMs (delivered in Nov2011) At DESY 2012 FEB Low Gain High Gain Linearity & Amplitude scan Single photon electron spectra Analysis mainly done by Jiří Kvasnička Fast Fourier Transform of p.e. spectra to get the peak distance Thanks to Mathias Reinecke with effort to set up HBU2

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague8 Amplitude scan LG 2 nd row (notched fibre) 12 channels Recalculated from SPIROC ADC bins to SiPM pixels and LED linearity measurement (see next slide)

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague9 QMB1 linearity, amplitude scan Standard LED pulses 3ns, PWR measured by optical power meter ThorLabs PM100D Differential Nonlinearity

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague10 HG - SPeS 3 rows of notched fibres squares indicates bad channels (SiPM, sci, or SpiRoc2b channel) 10 bad (unusable) channels of 36 ( = 28%) Nov2011 SiPM tiles are different to 2010 tiles, seems to get worse spectra HBU2 QMB1s Two best p.e. spectra of 2011SiPM batch

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague11 Reminder: nice spectra 2010 Spread of SiPM gain is about factor 3, it corresponds to data from ITEP. Single p.e. spectra QMB6 to SPIROC1 & SPIROC0 different SiPMs in the 2010 and 2011 batches

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague12 Result of FFT on best 2011 SiPM p.e. spectra FFT can see deep in Signal to Noise ratio Best spectra of 2011 SiPM

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague13 Result of FFT on bad 2011 SiPM p.e. spectra

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague14 Conclusions QMB1 is in full operational stage –It is working, no major troubles occurred –First 6 boards (version 1) we have in hand –fw is finished, QMB1 communicate via CANbus with PC –LabView exe file can control the board November2011 batch of SiPM has worse parameters in p.e.spectra over older batch Upgrade of QMB1(v2.0) is foreseen in mid of 2012 FFT is successfully applied on p.e. spectra to extract SiPM gain Notched fibre semiautomatic machine is hw ready, its sw is under development, in April new set of fibres to test at DESY

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague15 Back-up slides

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague16 2 nd row Correction to fibre data (Smolda)

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague17 HG - SPeS 3 rows of notched fibres ellipsoids indicates bad channels (SiPM, sci, or SpiRoc2b channel) 10 bad (unusable) channels of 36 ( = 28%) Nov2011 SiPM tiles are different to 2010 tiles, seems to get worse spectra HBU2 QMB1s We see decrease of response! Partially due to wrong orientation of fibre

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague18 Quick Friday’s QMB1 test with HBU2 Some config troubles occurred Generally, system is working easily, run in stand-alone mode Pulse position at different LEDs can be easy tuned within 1ns Near future plans (tomorrow) –Hold scan –Better notched fibre to install –Single p.e. peak spectra Next year plan (February) –More channels equipped with scintillators –Xtalk and light spread study System is working!, but Big spread due to combination of factors: Bad fibre, hold scan did not matched 2011 Distribution will be better, do not worry!

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague19 Principal schema Larger inductor than the older QMB6

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague20 PIN-PD response to QMB1 flash PIN-PD only, no preamp 5ns/div Upper: PIN-PD w preamp 10ns/div Lower: PIN-PD w preamp 50ns/div Maximal LED amplitude, LED airgap to PIN-PD

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague21 Mechanical layout of QMB1 Outer line: 30 (29) x 140 mm^2 4 mounting holes for M2.5 screw LED

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague22 Notched fibres external company Safibra preparing the setup (semiautomat) to produce precise notches in the fibres We assume to have fibres made by new technology in 1.Q 2012, we assume less spread of the light at taps (<15% ). prototype fibres showed some systematic error (decay) in distribution of light, two test methodes  two results: flat and with decay. Under investigation now. illuminated by Green laser 24 notches

ShinShu, 2012 Mar 6Ivo Polák, FZU, Prague23 Notched fibres Semi-automatic tool Frame with x-y stepper motors Drill machine used as milling cutter to groove the notch Alu/PCB Template with moving scint tile PCB with 3mm holes Scintilator tile w SiPM Now in operational debugging & sw development stage