P.F.Timmer Nikhef Amsterdam Electronics- Technology 1 Low power HV supply with signal amplifier Base for a 10 dynodes HAMAMATSU PMT in single photon count mode P.F.Timmer Reference: http://iopscience.iop.org/1748-0221/5/12/C12049/ 28-01-2014 Amsterdam
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P.F.Timmer Nikhef Amsterdam Electronics- Technology 1 Low power HV supply with signal amplifier Base for a 10 dynodes HAMAMATSU PMT in single photon count.
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P.F.TimmerNikhefAmsterdamElectronics- Technology
1
Low power HV supply with signal amplifier
Base for a 10 dynodes HAMAMATSU PMT in single photon count mode
Low power Low RFI Low ripple Adjustable HV Small foot print
Optical moduleIncl. Storey logic
Version-3
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Requirements
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E/O Diagram
switch
pre-ampcomp
thdac
decoder
photons
3V3
spherelogic
switchswitch
3V3
12V
tim.,sc
conversions
ln
ln+1
osc.1 feedback
hvdac
HVi2c
12+19
PMT-base
cpld
Octopus
CLB
i2c
PMT-module
ID
extraelectr.
LVDSpinBOB
2
analog.out
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PMT proposed form factor
<1
05
dimensions in mm PCB spacePCB space
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HV generation
Uhv
k d1 d2 d9 d10 a
k d1 d2 d9 d10 a
Uhv
~
Cb
Cp
Resistor base
Cockroft Walton base
+Low power-Fixed voltage ratio
- High power- Temp. Sensitive- Volume
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Simplified diagram of HAM_PROMiS2_V1 base Voltage ratio: total 13 steps
1
1
1
1
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3
6
100n
d10
d9
d8
d1
d2
100n
100n
100n
100n
100n
100n
100n
22n
22n
22n
22n
22n
22n
22n
22n
3V3
22n
COCO
L2
L3
L1a
L1b
k
47n 47n
47n 47n
22k 22k
22k 22k
56
56
220pF
1uF
1M5
1M5
3G
PROMiS2
3V3
AAnalog and digital output
I2C
HV DAC out
FB
-700V to -1500V
L4
100n
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HV actual wave forms
KD1
D9D10
I-fet
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Select components which can withstand the high voltage in the CW multiplier.
Check dissipation of every component. Check distance on PCB between high voltage components. Determine on which side of the PCB which part of the circuit will be
placed. Find a connector system which is sturdy enough.
Design considerations
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Overview component specs.
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# Refdes Value Applied Maximum ActualMaximu
m ActualMaximu
m Part Actual Maximum package Part discriptionvoltage rated reverse reverse current current Type power power
voltage voltage voltagedissipatio
n dissipation(V) (V) (V) (V) (mA) (mA) (mW) (mW)
1C14, C32, C37 100nF 3,3 50
Ceramic Chip 603
General purpose MLCC 0603 X7R 100nF E6 range
2C34 1uF 2 6,3 Ceramic
Chip 603General purpose MLCC 0603 X5R 1uF E3 range
3C29, C30, C33, C39 10uF 3,3 6,3 Ceramic
Chip 603General purpose MLCC 0603 X5R 10uF E3 range
4C41 10pF 3,3 25 Ceramic
Chip 402General purpose MLCC 0402 NP0 10pF E12 range
5C36, C43 100nF 3,3 6,3 Ceramic
Chip 402General purpose MLCC 0402 X5R 100nF E6 range
6C38 220pF 3,3 50 Ceramic
Chip 603General purpose MLCC 0603 NP0 220pF E12 range
7C10, C12, C16, C28 47nF 115 200 Ceramic
Chip 805Middle voltage series 0805 X7R 47nF E12 range
25 J1 Connector Tiger Eye Socket, SEM series. 2x5p with 2 non-symmetrical placed welding pins
P. F.TimmerNikhefAmsterdamElectronics- Technology
Limited space. High dv/dt in parts of the circuit. High voltage on PCB. Constraint editor is used. Very low signal amplification. For one photon 480 fC (PMT gain =
3E+6) DFM check of the PCB.
Layout
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Fit rate components
number ofcomponent
s Component Fit totalFit
1 COG capacitors 2 236 X74 capacitors 4 14428 Small signal Si diode 7 1961 Si small signal Transistors 12 12
13 Metal film, 1% 7 911 Op Amps, Comparators (COCO) 130 130
SpecificationsHV circuit, for 10 dynodes PMTLow ripple
706 mV1170 8.5 < T(°C) < 22.10.07% 8.5 < T(°C) < 22.1Voltage stable at 3 V < Vinput < 3.6 V
Low total powerVinput 3.3 V 4,5 mW 1500V for HV generation30 mW for PROMiS2Low RFIdV/dt < 75 mV/µs, RFI -20 dB @ 150 kHz-10 MHzAdjustable HVcathode voltage -700 _ -1500 V Adjustable threshold for pulse width adjustment
~ 30nSec for one photonSmall foot printPCB = 43 mmØ
Reliability200 FIT @ 20 °C, stationary use, after tests
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Validation tests chips◦ Tests the PROMiS2 and COCO chips by a test house.
◦ (Functional, HTOL, HTSL, ESD ad Q&R tests.)
PCB tests ◦ Storage;
Tamb->30min-10 °C ->1h->60 °C ->1h->60 °C ->-10 °C ->30min->Tamb
◦ Temp. Shock;Tamb->Tamb+50 °C ->1h->Tamb+50 °C -> 0sec ->Tamb
◦ Influence oscillator frequency on PMT output
Acceptance tests (meet specifications)◦ Done with PMT base tester
Cleaning + Drying◦ Ultra sone
Coating◦ Polyurethane
Test procedures
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Promis
PROMIS
omiCoCo
CWHighVoltagecircuit
HV measurement
unit 1supply
HV barrier
HV measurement
unit 14supply
HV barrier
PMT base adapter
ControlBoard
PMT TailAdapter
VoltageAdjustmentandCurrentmeasurement
TestPROMISoutputs
Safety system
Electronicsfor chargeinjection PROMIS Test HV
Control And I2C
Digital value HV control
Digital value of inter dynode voltages
Digital value for charge adjust
Digital value PROMIS outputs
CoCo testfrequentieandpulse width
Digital values frequency and pulse width
PMT base
Discharge capacitors from CW high voltage circuit
Test setup
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Check if supply current is in range. Check I2C communication. Check DACHV output of PROMiS2. Check switch output of COCO. Check pulse width of switch output of COCO. Check maximum frequency of COCO. Check if HV is coming up. All inter dynode voltages are measured
separately. Check range of HVDAC output and HV output. (steps of 50V). Check if HV diodes and capacitors don’t leak. Check system with supply voltage variations from 3V – 3.6V. Check pulse width output of PROMiS2 when charge is injected.
Comparator DAC will be set to give the right pulse width. Check analogue output of PROMiS2 when charge is injected.
RoHS directiveRestriction of the use of certain Hazardous Substances in electronic equipment.Consequences;Higher solder temperatures (up to 260°C)Favorite solder: SnAgCu alloy (217°C)Chance for more excessive tin whisker growth
Tin whiskers, length up to 10mm, diameter up to 10µm.Optimal growth at 50°CRef: http://nepp.nasa.gov/whisker/background/index.htm
electrical short circuitsdebris, contamination,metal vapor arc, due to HV.
Image Courtesy of T. Riccio (STPNOC)
Conformal coating like Parylene Ctends to buckle the whisker.