2011 - oct - 6Ivo Polák, FZU, Prague1 Calibration system for SiPM and LED notched fibre distributing system Ivo Polák, on behalf prague’s group [email protected]

2011 - oct - 6 Ivo Polák, FZU, Prague 1

Calibration system for SiPM

and LED notched fibre distributing systemIvo Polák, on behalf prague’s group

[email protected]

1. QMB1 performance2. QMB1 with Toroidal inductor at PCB 3. Trigger distribution4. Notched fibre light distribution systems 3x245. Resume


Two calib. systems since 2003

• CMB 2003 - 2007

• Quasy Resonant systems 2007 - present

• Members of our group:– Physicists: J. Cvach group

leader, J. Smolik, J. Zalesak– Electoronics: J. Kvasnicka,

M. Janata, I. Polak– D. Lednicky


Calibration and Monitoring Board (CMB)

• CMB consists of:– 12 UV LEDs, each LED illuminates

18 scintillating tiles– 12 pin-photodiodes preamplifier

(LED feedback)– Light flash is steerable in width

(2~100ns) and in amplitude – Controlled externally by CANbus, T-calib

(LVDS) and V-calib (differential analog signal)

– Temperature readout, several sensors are placed on the module

June 11, 2011 TIPP 2011, Kvasnicka 3

12 LEDs

. . . . . . . .

12 Photo-diodes

HCAL 1m2

BT 2006-2009, now WHCAL

T=Temp sensor

. . . .

HCAL layer


LED driver on CMB

• The LED is driven differentially

• The key component is an IC IXLD02, a LED driver from IXIS company

• Reverse voltage is applied right after the pulse LED stops to shine immediately

• Disadvantage: RFI (radio frequency interference) due to the sharp edges



CMB results • CMD worked well for the 1m3 HCAL phys.

Prototype (and still works with WHCAL!) • Used for

– Low intensity: the Single Photon Spectrum (gain calibration)

– High intensity: SiPM saturation– Temperature measurements (for corrections)



QMB1

• Quasi resonant Main Board– Modular system, 1 LED per board – DAQ + CANbus control, or stand-alone mode– LVDS Trigger distribution system– Variable amplitude, zero to maximum smooth– Pulse width fixed to abt. 5ns (UV or blue LED)– Voltages and temperature monitor– Width of PCB 30mm, depth 140mm


Quasi-Resonant LED driver

• Less RFI, not sensitive to magnetic field –tested up to 4T

• PCB integrated toroidal inductor (~35nH)

• Fixed pulse-width (~4ns)

LED current 1V => 1A

PIN signal

4ns/div

1App

To be To be increased, to increased, to get more light.get more light.

Longer pulse Larger inductorGET more light!GET more light!


6-LED QR driver Main Board = QMB6

Consists:

- 6 QR LED drivers

- 2 PIN PD preamps

- CPU + communication module, CANbus

- Voltage regulators

- temperature and voltage monitoring


LED, optical power test DC and pulsed

Optical Power Meter PM100D with Si sensor S130D by Thorlabs

Some LEDs intended to calibration

Prague, March 2010


QMB6 performance


3 mm

5 mm

• Very nice single photon spectrum (due to <3.5 ns pulse)

• Nice saturation curves (12 LEDs illuminated by 1 LED)

• We did a test in 4T magnetic field with a minimal effect (<1%) on operation

• Dynamic range up to 200 MIPs per position

• LED optical power up to 0.4 nJ per pulse

~200 MIPs


Principal schema

Larger inductor than the older QMB6


Signal distribution

at

30 x 140 mm^2

Two flat cables, Twisted pair for Trigger


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


3D draw of QMB1

LED

fibre

PWR 15V and CANbus

T-calib LVDS flat cable


Mechanical layout of QMB1

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

4 mounting holes for M2.5 screw

LED


Notches at one long fibre (24notches total)

Notch # 4 Notch # 24 last one, biggest

Light coupled from tap

LED side

Taken on microscope with zoom ~50


Notched fibre illuminated by green laser pointer


Optical fiber: performance

• We have measured several hand-made notched fiber:

– 72 notches: tolerance within 20%– 24 notches: tolerance within 15%– 12 notches: tolerance within 10%

• We had a measurement mismatch with a fiber producer We discovered, that the measurement methodology is crucial

• Latest measurements of the light yield – Through the 3mm hole on the PCB (FR4 with

filled inner layer)– 3 positions of the notch according to the PCB

thru-hole


“start” position “middle” position “end” position


work at 2011• QMB1 (1-chanel LED driver):

– Done• Topology, PCB design• Communicating bus (CAN)• CPU (Atmel AVR)• Trigger distribution (LVDS)• Trigger delay canbe tuned by C trimmer (~10ns)• 4 mounting holes for screw M2.5• Fibre(LED) position set to center of PCB

– PCB in production + assembly – To be done Debugging in October/beginning of Nov

• Set of notched fibers, semiautomat machine under development

– Set: 3*fibre with 24 notches, creating a line of 72 notches.

– 3 sets will be delivered in November

2010 Idea


Resume

• QMB1 is in PCB design stage– Exact position of PCB holes to be defined– Exact UV-LED position, coupling to fibre to be defined

• QMB1 in hand with fw - expected in autumn

• We are open to collaborate with other group!

Documents

2011 - oct - 6Ivo Polák, FZU, Prague1 Calibration system for SiPM and LED notched fibre distributing system Ivo Polák, on behalf prague’s group [email protected]