Upload
minnie
View
30
Download
1
Tags:
Embed Size (px)
DESCRIPTION
Ivo Pol á k, on behalf of Prague’s group [email protected] QMB1 specifications Test with HBU2 Analysis of light fibre distribution Notched fibre, semiautomatic machine Conclusions. LED notched fibre distributing system QMB1 with HBU2 test. QMB1. - PowerPoint PPT Presentation
Citation preview
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 [email protected]
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
ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 14
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 6 Ivo Polák, FZU, Prague 15
Back-up slides
ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 16
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!
ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 19
Principal schema
Larger inductor than the older QMB6
ShinShu, 2012 Mar 6 Ivo Polák, FZU, Prague 20
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 6 Ivo Polák, FZU, Prague 21
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