1. Calorimeter Mu2e Development electronics Front-end Review
G. Corradi S. Ceravolo D.Tagnani F.Colao
8 november 2016

2. Calorimeter routing Detector Solenoid DAQ room ~7-8 m Floating LV
overall cross section
~180 cm2
Floating LV
+28V / negative
Floating positive HV
230 V (MPPC)
ground
~60-80 m
overall cross section
~210 cm2 LV HV
isolation
OVP filter
Safety
Ground
Detector Ground
Floating Structures

3. Layout front-end Mezanine Board Digitizer 3V3 8V 28V, 30W Unit 1
HV_250_DC_V
40mA, 10W
per unit
28_DC_V
1.15A, 32W
per unit
Unit 2
Unit 3
Unit 4
28 DC V
10A, 280W
per 8 units
common sense
HV_250 DC V
320mA, 80W
per 8 units
common sense
Unit 5
Unit 6
Unit 7
Clock Distribution
Unit 8

4. Architecture front-end
Optimization of the space in progress
Cables and connectors in progress

5. Preamp-Regulator scheme

6. Electric preamplifier scheme
Preamplifier_SIPM
Preamplifier
Shaper filter
Select Gain
Select Pulse Test
Differential Driver
Linear Regulation
Electric preamplifier scheme

7. Simulation before end after filter

8. Simulation bandwidth Preamplifier
Plot of the simulated transfer function, good phase margin
Not forgetting that the source capacity of approximately 1nf

9. Simulation bandwidth after filter
Plot of the simulated transfer function, after shaper filter
Amplitude and phase plot with gain Vout/Vin 30

10. Preliminary Specifications Preamplifier
Gain Vout/Vin 2 step remote control
Dynamic differential /-1V
Bandwidth Mhz
Rise time ns
Output impedance Ω
Stability with source capacity max nf
Coupling output end source AC
Noise, with source capacity 1pf
Power dissipation mW
Power supply V
Semi-gaussian shaping filter pole
Time after shaper ns
Injection test pulse charging, fixed amplitude mV
Input protection mJ

11. Linear_ Regulator Electric linear regulator scheme Linear Driver
Decoder
ADC 16bit
Linear low Voltage section
I2C line
DAC 16bit
Electric linear regulator scheme

12. Preliminary Specifications regulator
Vin max V
Current limit 2mA
Dynamic regulation 5V to 200V
Settling time us
Ramp-up programmable 1ms to 100ms
Ripple estimated 3mVpp
Stability, theoretical value Δt 10 °C better 50 ppm
Power dissipation with out load min 50 mW
Power dissipation max load, worst case max 350 mW
Temperature measurement to 50°C
Monitor current detector 50uA to 2mA
Remote control I2C
GND insulated from earth Ceq max 5pf
Therma-Bridge to dissipate heat insulated gnd

13. PCB Layer TOP Preamplifier
Drivers Section
Filter section
Preamplifier section
Dimention card 58mm x 30mm

14. PCB Layer Bottom, Linear Regulator
Output connector
Analog signals
Digital I2C
Supply low voltage
High voltage
Temperature Sensor
Detector
Fixing hole and transfer heat
Very low thermal resistance

15. Final Assemblay Thermal conducting Power to dissipate max 350mW Board
Thermal Contact
By Bridge resistor
Thermal conducting
Power to dissipate max 350mW
Board
Temperature Sensor
Case
(Cu)
Output Connector

16. Mechanical front-end support
Connector Output
Electromagnetic shield
Cooling channel
Card Preamplifier_Regulator

17. Controller ARM first prototype
Regulator 8V
Buffer I2C
ARM Controller
Primary HV_Generator
Protection fuse 28V
Voltage regulator 8V
ARM Controller
I2C communication buffer
Communication line with Digitizer
High voltage distributor

18. Controller Arm first prototipe
Rear view input output digital I2C
View analog connector differential signals
Connector views one-wire temperature measurement

19. Mezzanine card control 20 channels
Front Panel view

20. Mezzanine card control
Rear view
Analog to Digital
Interfaces with
Digitizer

21. Mezzanine card control
View inserted
Connectors on the
Front panel

22. Mezzanine card control
Sizing connector
spaces

23. Mezzanine card control Dimension
Retail size card

24. Status and perspectives
Preamp-regulator, completed test
There are maximum dynamic problem
Firmware almost completed
Thermal tests to be completed
Radiation resistance testing to be completed
Connection cable between pre and controller we found a likely champion
Project progress, primary regulator prototype 250V 350mA
Project progress, primary regulator prototype 8V 1A, with active filter output.
Project progress, controller ARM per 20 channels
Draft of communication protocol I2C