Development of LYSO Detector Modules for an EDM Polarimeter at COSY. for the JEDI Collaboration

Transcription

1 Mitglied der Helmholtz-Gemeinschaft Development of LYSO Detector Modules for an EDM Polarimeter at COSY for the JEDI Collaboration February 28, 2018 DPG Spring Meeting, SMART EDM_Lab, TSU, Georgia Supv: Dr. David TSU; Dr. Irakli FZJ

2 Talk overview Objective Latest concept of the JEDI* Polarimeter LYSO Module Assembling Module Inspection and Tuning in the Lab Energy Resolution & Linearity Tests HV Power Supply Summary & Outlook * JEDI Juelch Electric Dipole moment Investigation 2

3 LYSO Modules Assembling 3D drawing of the module Aluminum Housing SiPMs, 20 µm pixel, 8x8 array of 3x3 mm (SensL J series) 64x14K ~ 900K pixel SiPM connector with bypass caps Kapton tape 3

4 LYSO Modules Assembling Two layers of foils: I - Four different inner layers (reflector) II - Tedlar (outer) foil (light tightness) 3D printed plastic for centering silicon Silicon layer Optical coupling Mechanical stability Radiation protection 1. Teflon 50 µm 2. Tyvek ~ 100 µm 3. Smooth Mylar - 25 µm 4. Wrinkled Mylar - 25 µm Tedlar 50 µm Teflon Cut corners for mechanical fixation 4

5 12 cm LYSO module LYSO Modules Assembling 3 rd hand during assembling Ready for test SiPM array LYSO 2 x 50 µm Teflon 2 x 50 µm Tedlar 2 x 25 µm Kapton Enough depth to stop 270 MeV deuterons Energy loss can be estimated 5

6 pedestal LYSO Modules Lab Tests Analysis 60 Co Lu, 30 V Supply, 4 mv threshold, Left Down 3 rd Module Internal radiation 1170 KeV 1330 KeV 2500 KeV 6

7 pedestal LYSO Modules Lab Tests Analysis 22 Na Lu, 30 V Supply, 4 mv threshold, Left Down 3 rd Module 511 KeV Due to the Internal radiation 1275 KeV 1786 KeV 7

8 LYSO Modules Lab Tests Analysis LYSO Module Linearity low energy!) R = FWHM E LYSO Module Energy Resolution (@ low energy) E [KeV] Resolution [%]

9 SiPM Lab Test Signal Generator Power Supply 25v ~ 32v Pico ampermeter Dark box (Fixed Signal) SiPM Oscilloscope LED Flasher Test Procedure Functionality test Dark current monitoring using with constant 1V pk-pk output Signal shape monitoring 9

10 [a.u.] SiPM Gain vs Voltage 1mV variation ~ % in gain Used last Beam Time Gain variation is directly related to energy resolution Voltage [V] LYSO energy resolution ~ 1% Max. accepted V ~ 10mV 10

11 Development of a new voltage source Basic requirements: Modular design High output stability (temperature, long/short term, low noise) Remote on/off capability (currently organized using Raspberry Pi) Voltage adjustment (currently only manual) Linear voltage regulator part Ramp generator and on/off part 11

12 64 channel power supply with voltage monitoring Power supply moduls Voltage monitoring board Raspberry Pi Reference voltage board Port expander board 12

13 MUX1 MUX2 MUX3 MUX4 MUX5 MUX6 MUX7 MUX8 4 wire I/O Signal Voltage monitoring for 128 Ch RS232 Controller RPi 4 wire I/O MUX0 Multimeter / Osciloscope 13

14 Signal shapes 2mV 14

15 Summary LYSO module assembling and testing procedure 52 module ware assembled and tested successfully First version of modular voltage supply for SiPMs was successfully tested 128 channels voltage monitoring system was made Outlook Upgrade HW/SW packages for the read out system Analyze already taken data Further development of online analysis and readout system Flash ADC configuration set-up (user friendly ) Implementation of a triangular scintillator bars for particles tracking This work was supported by the Shota Rustaveli National Science Foundation (SRNSF) 15

16 Appendix 20

17 Polarimetry Overview High Stability Voltage Supply Remote control & monitoring Future plan Beam Target Flash ADC Network Switch Online Analysis & Monitoring Server Computer Back-up for offline analysis 17

18 LYSO Modules Lab Tests Light Tightness Measurements of 22 Na, 60 Co, 176 Lu (internal) Optimal supply voltages Signal offset (current leakage) High precision power supply Red Pitaya & Raspberry pi dual-core ARM Cortex A9 and FPGA MCU DAQ 14 bit ADC 125 Mb/s v SiPM with LYSO 18

19 Signal shapes Signal from one channel 2mV 19

20 Data acquisition hardware Struck innovation system: SIS3316 flash ADC Features/Properties: 16 channels 250 MS/s per channel = 4ns between timestamps 14-bit resolution 64 MSamples memory/channel... Data traffic: 1 sample = 2 Byte 1700 sample = 3.4 KB 40KHz ~ 1Gb/s limit! Module side Flash ADC side 20

21 Data acquisition software Developing at SMART EDM_Lab LYSO modules PC #1 PC #2 Start & Stop counters 16 ch. FADC (SIS3316) EMS cluster server Event builder VETO detectors Analyses modules Data manager Event builder, data manager and client software parts are based on CERN ROOT libraries PC #3 Clients (access spectra) 21

22 Time Resolution Analysis (SW CFD) M. Tabidze, N. Lomidze Cosmic Run with PMT & LYSO Cosmic run 22

23 Time Resolution Analysis (HW CFD) Signal delay in 1m cable Deuteron TOF between start counter and detector Start Counter LYSO module Beam Target 23

24 Time Resolution Analysis 1. Software based Constant Fraction Discriminator (CFD) Moving Average Window - MAW 2. Built-in feature (Hardware CFD) 24

25 1 st Set-up for COSY Beam Time Slow Control 25

26 First Test on LYSO Bragg peak LYSO Beam Module rotation F. Müller, PhD Deuteron Energy deposit in 270 MeV 26