ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 1

LED notched fibre distributing system QMB1 with HBU2 test

Ivo Polák, on behalf of Prague’s grouppolaki@fzu.cz

1. QMB1 specifications2. Test with HBU23. Analysis of light fibre distribution4. Notched fibre, semiautomatic machine5. Conclusions

ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 2

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:

http://www-hep2.fzu.cz/calice/files/20110915-

Polak_I.CALICE_Heidelberg.pdf

Single power 15V 65mA

ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 3

Frame with 5 QMB1 boards (and 1 spare)

ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 4

DESY test setup in February 2012

HBU2

DIF, PWR, CALQ

MB

1

QM

B1

QM

B1

QM

B1

T-calib from DAQ- DIF

CANbus

SPIROC2

PWR 15V

combiner

Not

ched

fib

res

Single layer frame

ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 5

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 6 Ivo Polák, FZU, Prague 6

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 6 Ivo Polák, FZU, Prague 7

Test at DESY• HBU2 (two SPIRoc2b ASICs) equipped with 3 rows of scintillators &

SiPMs (delivered in Nov2011)• At DESY 2012 FEB 15 - 21

• 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 6 Ivo Polák, FZU, Prague 8

Amplitude scan LG

• 2nd row (notched fibre) 12 channels

• Recalculated from SPIROC ADC bins to SiPM pixels and LED linearity measurement (see next slide)

ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 9

QMB1 linearity, amplitude scan

Standard LED pulses 3ns,

PWR measured by optical power meter ThorLabs PM100D

Differential Nonlinearity

ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 10

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 6 Ivo Polák, FZU, Prague 11

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 6 Ivo Polák, FZU, Prague 12

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 6 Ivo Polák, FZU, Prague 13

Result of FFT on bad 2011 SiPM p.e. spectra

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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

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Back-up slides

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2nd row Correction to fibre data (Smolda)

ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 17

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 6 Ivo Polák, FZU, Prague 18

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! , butBig spread due to combination of factors: Bad fibre, hold scan did not matched 2011

Distribution will be better, do not worry!

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Principal schema

Larger inductor than the older QMB6

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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

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Mechanical layout of QMB1

Outer line: 30 (29) x 140 mm^2

4 mounting holes for M2.5 screw

LED

ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 22

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 6 Ivo Polák, FZU, Prague 23

Notched fibresSemi-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