UoA calibration system1 Modular calibration/monitor system for the GlueX BCAL +FCAL University of...

UoA calibration system 1

Modular calibration/monitor system for the GlueX BCAL +FCAL

University of Athens *G.VoulgarisE.G.AnassontzisP.IoannouE.KapposC.Kourkoumelis

*with lots of help from Elton, Zisis, George L. and Matt

UoA calibration system04/19/23 1

04/19/23 UoA calibration system 2

The main idea is that we need continuous monitoring and relative calibration info (absolute will be done by physics channels) from the above systems.

BCAL involves novel readout elements (the SiPM’s) and their performance as well as the possible ageing of the detector elements etc has to be monitored and studied extensively (gain shifts etc).

The main philosophy behind :The main philosophy behind :

GENERAL QUIDELINESGENERAL QUIDELINESThe calibration system should be:Modular-> applicable to both detectorsSimple (avoid optical benches and high power lasers, exploit available technology)The light->readout part: small in size->since readout elements are closely packedReasonably priced

Pulser Control Module (LPCM)

and Fan out to LED boards

LED

OUR PROPOSED SOLUTION:OUR PROPOSED SOLUTION:After a study of the various options (Laser +light distributions with fibers, low cost splitters etc) we converged to light generated by LED’s close to the calorimetersAPPLICABLE TO BOTHAPPLICABLE TO BOTHCALORIMETERSCALORIMETERS

LED board 3UoA calibration system

BCALBCAL

04/19/23 4UoA calibration system

UoA calibration system

Possible considerations for BCAL Possible considerations for BCAL +SiPM+SiPM

LED board size new designBoard height (components + PCB thickness = 1.4mm + 0.8mm ≤ 2.5mm

LED ageing: for output 20ns at 1kHZ expect 620sec “on”/year 7% deterioration/year for DC operation

Positioning the board: on the tapering of the Winston cone (can illuminate the other side SiPM)

5UoA calibration system04/19/23

Light guides with LED boardLight guides with LED board

604/19/23 UoA calibration system

Near side

P.H.=1.03 V

Far side

P.H=118 mV

Add attenuation through full full module -> Far/Near ~ 3% too large dynamic range

Near and far side pulses for Baby Near and far side pulses for Baby CalCal


Regina proposal/solution:Regina proposal/solution: Inject the light into the light guide via short Inject the light into the light guide via short green-blue fiber green-blue fiber (optimal injection angle ~15(optimal injection angle ~15o ) )

Far/Near 5:1Far/Near 5:1Mounting

3,000 boards is

trickyFiber will be

much shorter

Possibility to mount LED

on the board at an

angle04/19/23 8UoA calibration system

New idea fiber on board

LED Board 25mmx 7mm ,2 layer, 2.4mm thick, blue LED

Daisy chained to 10 light guides and wired to control PCB


Control PCB90mmx50mm,

2 layerReceives 4 triggers and drives 4 different daisy chains of LED boards.


Control boardQUANTITY = 2DIMENSIONS (approx.) : 90mm x 50mm, 2-layer PCBCONNECTORS•1 x 2-row (5+5 pins) pin header for ribbon cable connector to provide:T1, T2, T3, T4 (triggers), +5V supply, GND_digital, V_bias (0 to 25V),

GND_biasStandard 2.54mm pitch for pin header and ribbon cable to be used•4x4-pin connectors (pin headers) for the 4 daisy chains•TOTAL POWER DISSIPATION: 200 μW (for 1kHz)--------------------------------------------------------------LED boardsQUANTITY = 80DIMENSIONS (approx.): 25mm x 7mm, 2-layer PCBBoard thickness = 2.4mmLED choice: KINGBRIGHT LED, BLUE, KP-3216MBC, 1206 size (or other)TOTAL POWER DISSIPATION: 80 μW/board-------------------------------------------------------- Ribbon cable assemblies (daisy chains)QUANTITY = 84-wire ribbon cable (daisy chain) with 10 LED boards per chainLengths and spacing to be agreed upon--------------------------------------------------------------

After lots of discussions we converge to article one:After lots of discussions we converge to article one:Construction of two control Boards and 80 LED Boards Construction of two control Boards and 80 LED Boards which will be used for which will be used for BOTH BCAL and FCAL BOTH BCAL and FCAL with minor modifications (on small boards)with minor modifications (on small boards)

12UoA calibration system

To test, as soon as : 1)the Article one (new boards) arrives2)the light guides from USM arrive 3) some SiPM’s ???4)unfortunately the new Baby Cal arrived unpolished (so we have to use the old rectangular one)

•Test a “full” size read out chain from both sides •Check space in between guides •Extrapolate to real size•Check functioning of different triggers •Cross talk of different triggers

In the near future


FCALFCAL


Four different colour LED’s will be used 410,470,525,590

nm


Full size plexiglas proposed by J.Fye Full size plexiglas proposed by J.Fye for illumination of Pb glass four quadrantsfor illumination of Pb glass four quadrants

~2.6 x 2.6 m~2.6 x 2.6 m22

“Protype” measured


Configuration• Lucite 117x 95x 1.24 cm pane [instead of

1.3x1.3m] (already existed in the lab, but non polished) placed horizontal in the black box.

• Define a grid on the Plexiglas where a square grid of 10x10 cm was marked

• Few blue LED’s (V=17V) mounted on the two long (free) sides of the pane

• A Pb-block in contact with the pane fixed but scaned different positions in the grid vertically. HV of the PM was 1700 V

• Studied number and position of LED’s


LED board mounted on the pane

Control board



One LED only used

04/19/23 UoA calibration system 22Six LED’s used

Please note:Uncertainty

+/-30%

04/19/23 UoA calibration system 2304/19/23 UoA calibration system 23Six LED’s used on the same side

Please note:Uncertainty

+/-30%

Normarized to mean value

Conclusions• The LED option has progressed well and

it is at the final design and testing stage• The position and signals, number of

boards etc for BCAL have been defined and will be verified by final testing.

• The light injection from the LED to the light guides has to be finalized.

• The number of boards, colours, positions etc for FCAL have been also defined for the FCAL, subject to testing with the first article.



BACK UP



VOLTAGES FOR LED CONTROL BOARD: A. All signals can be supplied by ribbon cable

B. Vbias will preferably have its own return wire (GND_B) C. Wires needed (8):

T1, T2, T3, T4, +5V, GND, Vbias, GND_B

CALCULATION OF VOLTAGE DROP IN CASE ALL LED’s FIRE AT ONCECALCULATION OF VOLTAGE DROP IN CASE ALL LED’s FIRE AT ONCEIn any case, assuming 25V operation, 1km of ribbon cable (250 Ohm/km), AWG 28 a pessimistic 10000 MOhms insulation resistance for each cap we have 2.5nA/cap leakage, i.e. 100nA per box of 40 caps which on a 1km cable gives a drop of 25 uV. If the insulation resistance drops to 1000 MOhms, say due to humidity, the drop over 1km cable will be 0.25 mV. If I add protection to the Vbias wire against overvoltage or electrostatic build-up, this is expected to add some microamps of leakage, depending on the device chosen.

This may result in a few mV of voltage drop for 1km wire.

Rough schematic


Monitoring System

Connector- Fischer Series

102 (up to 9 pins for this

connector)

Monitoring System PCB can extend into this section if more space is needed

(avoiding 2” mounting plate)

Monitoring System Connector-

mounting to end plate allows for modular cooling plate- electronics

assembly (i.e. monitoring system stays with BCAL 2” mounting plate

Monitoring System control PCB- shown

as 4.5”x2” (114x51mm)


Emerald LED, Temperature dependence for different driver voltages Vd ~0.5%/oC

Temperature dependence for different supply voltages. Emerald InGaN LED.

Pulse Heigh vs Temperture KT-VGC

0

10

20

30

40

50

60

70

15 25 35 45 55

Temp C

AP

D s

ign

al

mV

Vd=12,031Vd=16,016Vd=19,062



Part Number: KPTD-1608QBC-G Blue

UoA calibration system1 Modular calibration/monitor system for the GlueX BCAL +FCAL University of...

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