cosmic shower detector v3

11 months ago 446
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Description

Overview

The MuonPi Project utilizes an inexpensive Raspberry Pi B+ plug-on module for particle and nuclear physics detectors aimed for measuring muons from atmospheric showers triggered by high energetic cosmic particles. The goal is to set up a distributed network of these detector stations in order to determine the energy, timing, and eventually the origin of the primary particles. To do so, the detected events are timestamped utilizing an on-board GNSS receiver with a precision in the nanosecond range to search for off-line event coincidences between other detectors in the network.

The circuit comprises two inputs for typical input signals (PMTs, SiPMs etc.) with positive or negative pulses of up to few hundreds of mV amplitude and several tens of nanoseconds length. Each channel exhibits switchable inverters, adjustable threshold discriminators (TLV3502 followed by 74LV221 monostable gate) for fast timing and the option for amplitude processing by plugging in a piggy-back peak-detector module (channel 1 only) for amplitude measurement with the on-board slow sampling ADC ADS1015/1115. Timestamping of the single channels or a logic coincidence thereof (XOR or AND) is achieved with the interrupt input of a U-Blox NEO-M8N GNSS module with few tens of nanoseconds precision.

This version of the circuit utilizes two options for bias voltage generation: a cheap commercial DC/DC upconverter (XL6009) as plug-in module (available eg. from eBay) or mounting of the components foreseen for an adjustable on-board DC/DC converter around an LM2733.

Status

  • July 2020: V3.0 design is complete. Design review in progress. PCBs ordered at JLCPCB
  • August 2020: PCB mounted and tested. Following issues found: a) shtdown pin (pin 4) of U502 connected to GND in design. Bend up this pin and connect to VIN (pin 5) b) transmission line for signal EVT_XOR runs unshielded underneath the comparator U2. This causes cross-talk from ch2 to ch1, when two channels are used. Disconnect pin 5 of U301 from PCB (bend up) in this case. Single-channel-only configuration should work fine on ch1, no workaround is needed in this case.
  • Design update in progress for V3.1 (master branch, not finalized yet): swapped inner VCC and GND layers from layers 3 and 4 to 2 and 5 respectively. This assures proper shielding between signal layers (top, inner 3, inner 4, bottom) and should prevent the aggressive cross talk observed in V3.0. Moved misplaced L501 to correct position behind the smoothing capacitor C501. Added large inductor for supply of DC/DC plug-on module in schematic. This should be mounted, when the plug-on voltage module is employed in order to limit the inrush current. Added bypass zero-ohms from input A to output of U102 and U202. These should be mounted only when the polarity switches are omitted.
  • Sept/Oct 2020: Design of V3.1 was finalized and PCBs ordered at JLCPCB. Tests revealed, that all bugfixes and improvements (see above) were successfull.

Gallery

3d view of the MuonPi Raspberry HAT:

muonpi_pcb_v3_3d_9.png

muonpi_pcb_v3_3d_8.png

pcbv3_1.jpg

pcbv3_2.jpg

IMG_20200903_143647.jpg

Documents

digital pulse processor

interface

power supply

input stage ch1

input stage ch2

gps_rx

shower detector pcb v3

analog pulse integrator

BOM

ID Name Designator Footprint Quantity BOM_Manufacturer Part
1 SMACONNECTOR_EDGE_UFL X1,X2 SMA_EDGELAUNCH_UFL 2 U.FL-R-SMT-1(80)
2 51 R100,R200,R306,R308,R309,R307,R310,R311,R312,R705,R706 0805 11 CR0805J80510G
3 1k R102,R104,R204,R202,R300,R301,R302,R303,R401,R405,R406,R408,R409,R601 0805 14 AR05FTDW1001
4 2.7k R103,R105,R205,R203 0805 4 RS-05K2701FT
5 10n C111,C211 0805 2 TCC0805X7R103K501DTS
6 100n C112,C100,C110,C102,C202,C210,C212,C200,C304,C305,C561,C562,C563,C564,C566,C567,C551,C552,C565,C569,C570,C571,C572,C554 0805 24 FN21X104K500PXG
7 220p C101,C104,C204,C201 0805 4 TCC0805X7R221K500DT
8 1u L100,L200 0805 2 L-15F1R0JV4E
9 27 R106,R206 0805 2 CR0805F827R0G
10 10k R113,R213,R504,R512,R513,R514,R600,R413,R418,R419,R516,R509 0805 12 WR08X1002FTL
11 2.2p C103,C105,C205,C203 0805 4 TCC0805COG2R2C500BT
12 100 R114,R214 0805 2 0805W8F1000T5E
13 33p C300,C301 0805 2 TCC0805COG330J500BT
14 1n C302,C303,C503,C504 0805 4 0805B102K500CT
15 74LVC1G86DBV U303 SOT23-5L 1 SN74LVC1G86DBVR
16 74LVC1G02DBV U304 SOT23-5L 1 SN74LVC1G02DBVR
17 74AC151M U305 SOIC16N 1 74AC151M
18 470k R305,R304 0805 2 RS-05K4703FT
19 1k5 R400 0805 1 CR0805J80152G
20 24AA02UIDT-IOT U400 SOT23-5 1 24AA02UIDT-I/OT
21 ADS1015IDGSR U401 MSOP10 1 ADS1015IDGSR
22 MCP4728-EUN U402 MSOP10 1 MCP4728-EUN
23 LM75BIM-3 U403 SOIC8 1 LM75BD,118
24 RASPBERRYPI-B+-GPIO JP400 2X20 1 C35165
25 OLED-Display P400 HDR-4X1/2.54 1 Header-Female-2.54_1x4
26 TimeP LED409 LED-0805 1 ORH-W45A
27 BiasEn LED408 LED-0805 1 17-21SURC/S530-A3/TR8
28 St2 LED406 LED-0805 1 E6C0805UYAC1UDA
29 St1 LED405 LED-0805 1 ORH-G35A
30 PCA9536D U404 SOIC-8 1 PCA9536D
31 Ch2 LED404 LED-0805 1 17-21/BHC-XL2M2TY/3T
32 Ch1 LED403 LED-0805 1 17-21/BHC-XL2M2TY/3T
33 680 R404,R403 0805 2 RS-05K6800FT
34 VCC LED402 LED-0805 1 E6C0805UYAC1UDA
35 +5V LED401 LED-0805 1 E6C0805UYAC1UDA
36 4k7 R410,R411,R503,R416 0805 4 RK73B2ATTD472J
37 10M R505,R507 0805 2 RTT051005FTP
38 1M R506,R508 0805 2 RS-05K1004FT
39 4u7 C560,C550 R1206 2 GRM31CR71H475KA12L
40 1u C568,C553 0805 2 CL21B105KBFNNNE
41 TPS22944DCKR U503,U504 SOT353 2 TPS22944DCKR
42 10n/50V C520 0805 1 GRM216R71H103KA01D
43 BAT54 KL1 D501,D502 SOT-23(SOT-23-3) 2 BAT54 KL1
44 2N7002 Q501 SOT-23(SOT-23-3) 1 2N7002
45 MBRA160T3G D500 SMA(DO-214AC) 1 MBRA160T3G
46 150p C505 0805 1 TCC0805X7R151K500BT
47 LM2733YMF U502 SOT23-5 1 LM2733YMFX/NOPB
48 22k R502 0805 1 0805W8F2202T5E
49 13k R501 0805 1 0805W8F1302T5E
50 220k R500 0805 1 RS-05K224JT
51 10uH L500 1812 1 LQH43MN100J03L
52 1uH L501 0805 1 L-15F1R0JV4E
53 4u7/50V X7R C501 1206 1 GRM31CR71H475KA12L
54 10n C601,C600 0805 2 GRM216R71H103KA01D
55 UBLOX_NEO-6_UBLOX_NEO-6P U700 UBLOX_NEO-6P 1 ?
56 10 R700 0805 1 RK73H2ATTD10R0F
57 27n L700 0805 1 VHF201209H27NJT
58 120 R702,R703 0805 2 CR0805J80121G
59 SN74LVC1G3157DBVR U102,U202 SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL 2 SN74LVC1G3157DBVR
60 10k R112,R212 R0805 2 WR08X1002FTL
61 LMH6550MAX/NOPB U100,U200 SOIC-8_150MIL 2 LMH6550MAX/NOPB
62 Energy-Processor JP600B HDR-F-2.54_1X5 1 2685Y-105CNG1SNA01
63 SMACONNECTOR_EDGE_UFL X6,X5,X7 SMA_EDGELAUNCH_UFL 3 BWSMA-KE-P001
64 3k9 R414,R415 0805 2 0805W8J0392T5E
65 10 R515 R0805 1 RK73H2ATTD10R0F
66 Energy-Processor JP600A HDR-F-2.54_1X3 1 C146243
67 CAT24C32WI-GT3 U405 SOIC-8_150MIL 1 CAT24C32WI-GT3
68 TLV3502AID U2 SOIC8 1 TLV3502AIDR
69 SN74LV221AD U300,U301,U306 SOIC-16_150MIL 3 SN74LV221AD
70 MCP6L02T-ESN U501 SOIC8 1 MCP6L02T-ESN

Attachments

Filename Download
muonpi_pcb_v3_3d_8.png
muonpi_pcb_v3_3d_9.png
Schematic+Layout+BOM_MuonPi-HAT_v3.1.zip
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