led notched fibre distributing system qmb1 single led slice
DESCRIPTION
Ivo Pol á k, on behalf prague’s group [email protected] QMB1 specifications QMB1 with Trigger distribution First test with HBU2 Notched fibre, semiautomatic machine Resume. LED notched fibre distributing system QMB1 single LED slice. QMB1. Q uasi resonant M ain B oard - PowerPoint PPT PresentationTRANSCRIPT
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 1
LED notched fibre distributing system QMB1 single LED slice
Ivo Polák, on behalf prague’s [email protected]
1. QMB1 specifications2. QMB1 with Trigger distribution3. First test with HBU24. Notched fibre, semiautomatic machine5. Resume
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HH - 2011 Dec 13 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 ~ 5ns (UV or blue LED)– Voltages and temperature monitoring– Size of PCB: width 30mm, depth 140mm
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 3
Principal schema
Larger inductor than the older QMB6
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 4
TRIGGER (T-calib) LVDS distribution to QMB1
Trigger from DAQ
masterslaveslave slave slave
Terminated 120ohm
Terminated 120ohm
RX
TX
LVDSUp to 6 + 6 slaves modules
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 5
Signal distribution
at
30 x 140 mm^2
Two flat cables, Twisted pair for Trigger
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 6
Frame with 5 (and 1 spare) QMB1
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 7
3D draw of QMB1
LED
fibre
PWR 15V and CANbus
T-calib LVDS flat cable
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 8
Real single LED board QMB1
Power 15V 60mA
High level of LED peaks, 1.7A in pulse
Delay can be easily trimmed within 9ns
LED pulse width is shorter than expected 2ns, seen with current probe
Tested now in stand-alone mode
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 9
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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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 10
DESY test setup in December 2012
HBU2
DIF, PWR, CALQ
MB
1
QM
B1
QM
B1
QM
B1
T-calib from DAQ
CANbus
SPIROC2
PWR 15V
combiner
Not
ched
fib
res
Single layer frame
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 11
DESY test setup in DecemberNotched fibre (routed in paralel with blue line)
Only 11 points were illuminated properly
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 12
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
Distribution will be better, do not worry!
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 13
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
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 14
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
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 15
work at autumn of 2011• QMB1 (1-chanel LED driver):
– Done• 6 pcs of QMB1 in hand• Tune QRLed driver to 405nm LED• Trigger distribution (LVDS) proved• Trigger delay can be tuned by C trimmer
(~10ns)• A few bugs in circuitry found• Still short 3ns pulse
– To be done: finishing and debugging of fw – CANbus and monitoring
• Set of notched fibers, semiautomatic machine in tuning procedure
– Set: 3*fibre with 24 notches, creating a line of 72 notches.
– 3 sets of fibres will be delivered in 1.Q-2012
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 16
Resume
• QMB1 is in basic operational stage– It is working, no major troubles occurred– First 6 boards (version 1) we have in hand– More work on fw to be done
• Upgrade of QMB1(v2.0) is foreseen in mid of 2012
• Notched fibre semiautomatic machine is hw ready, its sw is under development
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 17
Distribution of light:Notched Fiber
• Light is emitted from the notches• The notch is a special scratch to the fiber, which reflects the light to
the opposite direction• The size of the notch varies from the beginning to the end of the
fiber to maintain homogeneity of the light, which comes from notches
First notch Middle notch End position notch
Emission from the fiber (side view)
Iluminated by Green laser
24 notches
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HH - 2011 Dec 13 Ivo Polák, FZU, Prague 18
Mechanical layout of QMB1
Outer line: 30 (29) x 140 mm*2
4 mounting holes for M2.5 screw
LED