UoA calibration system1 Modular calibration/monitor system for the GlueX BCAL +FCAL University of Athens * G.Voulgaris E.G.Anassontzis P.Ioannou E.Kappos C.Kourkoumelis *with lots of help from Elton, Zisis, George L. and Matt UoA calibration system8/23/20151

UoA calibration system2 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 : GENERAL QUIDELINES The calibration system should be:  Modular-> applicable to both detectors  Simple (avoid optical benches and high power lasers, exploit available technology)  The light->readout part: small in size->since readout elements are closely packed  Reasonably 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 calorimeters APPLICABLE TO BOTH CALORIMETERS LED board 3UoA calibration system

BCAL 8/23/20154UoA calibration system

Possible considerations for BCAL +SiPM  LED board size new design Board 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 system8/23/2015

Light guides with LED board 6 8/23/2015UoA calibration system

Near side P.H.=1.03 V Far side P.H=118 mV full Add attenuation through full module -> Far/Near ~ 3% too large dynamic range Near and far side pulses for Baby Cal 78/23/2015UoA calibration system

Regina proposal/solution: Inject the light into the light guide via short green-blue fiber (optimal injection angle ~15 ) Far/Near 5:1 Inject the light into the light guide via short green-blue fiber (optimal injection angle ~15 o ) Far/Near 5:1 Mounting 3,000 boards is tricky Fiber will be much shorter Possibility to mount LED on the board at an angle 8/23/20158UoA 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 8/23/20159UoA calibration system

10 1 st daisy chain of LED’s boards pulse this column of SiPM’s 8/23/2015UoA calibration system

Control PCB 90mmx50mm, 2 layer Receives 4 triggers and drives 4 different daisy chains of LED boards. 8/23/201511UoA calibration system

Control board QUANTITY = 2 DIMENSIONS (approx.) : 90mm x 50mm, 2-layer PCB CONNECTORS 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_bias Standard 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 boards QUANTITY = 80 DIMENSIONS (approx.): 25mm x 7mm, 2-layer PCB Board thickness = 2.4mm LED choice: KINGBRIGHT LED, BLUE, KP-3216MBC, 1206 size (or other) TOTAL POWER DISSIPATION: 80 μW/board Ribbon cable assemblies (daisy chains) QUANTITY = 8 4-wire ribbon cable (daisy chain) with 10 LED boards per chain Lengths and spacing to be agreed upon After lots of discussions we converge to article one: Construction of two control Boards and 80 LED Boards which will be used for BOTH BCAL and FCAL with minor modifications (on small boards) 12UoA calibration system

To test, as soon as : 1)the Article one (new boards) arrives 2)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 8/23/201513UoA calibration system

FCAL 8/23/201514UoA calibration system

Four different colour LED’s will be used 410,470,525,590 nm 8/23/2015UoA calibration system15

Full size plexiglas proposed by J.Fye for illumination of Pb glass four quadrants ~2.6 x 2.6 m 2 “Protype” measured 8/23/201516UoA calibration system

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 8/23/201517UoA calibration system

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LED board mounted on the pane Control board 8/23/201519UoA calibration system

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8/23/2015UoA calibration system21 One LED only used

8/23/2015UoA calibration system22 Six LED’s used Please note: Uncertainty +/-30%

8/23/2015UoA calibration system238/23/2015UoA calibration system23 Six 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. 8/23/201524UoA calibration system

8/23/2015UoA calibration system25 BACK UP 8/23/201525UoA calibration system

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8/23/2015UoA calibration system27 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 ONCE In any case, assuming 25V operation, 1km of ribbon cable (250 Ohm/km), AWG 28 a pessimistic 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 288/23/2015UoA calibration system

Monitoring System Connector- Fischer Series 102 (up to 9 pins for this connector) Monitoring System control PCB- shown as 4.5”x2” (114x51mm) Dry Gas Tubing- 8/23/201529UoA calibration system

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) 8/23/201530UoA calibration system

Emerald LED, Temperature dependence for different driver voltages V d ~0.5%/ o C Temperature dependence for different supply voltages. Emerald InGaN LED. 8/23/201531UoA calibration system

8/23/2015UoA calibration system32 Part Number: KPTD-1608QBC-G Blue