Development of LYSO detector modules for a charge-particle EDM polarimeter

Transcription

1 Mitglied der Helmholtz-Gemeinschaft Development of LYSO detector modules for a charge-particle EDM polarimeter on behalf of the JEDI collaboration Dito Shergelashvili, PhD SMART EDM_Lab, TSU, Georgia Supv: Dr. David TSU; Dr. Irakli FZJ 12 th September 2018 Ferrara

2 Steps in Polarimeter Design Ballistic Diamond Pallet Target 1 st sketch Plastic Scintillators Final design Tracking system 12/09/2018 Calorimeter Target chamber 2/21

3 Polarimetry Overview Stable voltage supply Remote control & monitoring Target Beam LYSO Modules Flash ADC Network Switch Server Computer Online Analysis & Monitoring Data for offline analysis 12/09/2018 3/21

4 LYSO Module Lutetium-yttrium oxyorthosilicate Lu 2(1-x) Y 2x SiO 5 Aluminum Housing 3D drawing SiPMs, 20 µm pixel, 8x8 array of 3x3 mm (SensL J series) 64x14K ~ 900K pixel SiPM connector with bypass caps 12/09/2018 4/21

5 Module Assembly 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 12/09/2018 5/21

6 12 cm LYSO module Module Assembly 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 12/09/2018 6/21

7 Modules inspection Stand-alone test bench for LYSO lab tests Redpitaya FPGA based 2 ch 125 MS/s DAC and function generator Linux on board C/C++ compiler Communication via LAN Raspberry Pi Root based online analysis software LAN 12/09/2018 7/21

8 pedestal Number of events LYSO Test Data 60 Co Lu, 30 V Supply, 4 mv threshold, Left Down 3 rd Module Internal radiation 1170 KeV 1330 KeV 2500 KeV 12/09/2018 8/21

9 Number of events pedestal LYSO Test Data 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 12/09/2018 9/21

10 LYSO Module Linearity LYSO Module Linearity low energy!) LYSO Module Energy Resolution R = FWHM (@ low energy!) E E [KeV] Resolution [%] /09/ /21

11 Polarimetry Overview: FADC Vary stable voltage supply Remote control & monitoring Target Beam LYSO Modules Flash ADC Network Switch Online Analysis & Monitoring Server Computer Data for offline analysis 12/09/ /21

12 Struck SIS3316 FADC 16 channels per module 250 MS/s per channel 125 MHz analog bandwidth 14-bit resolution Offset DACs Internal/External clock Readout in parallel to acquisition Capable of working in a chain Built-in hardware features (Pile-up detection, averaging and more) Self triggering FPGAs 12/09/ /21

13 Struck SIS3316 FADC: Time Resolution Amplitude threshold trigger vs CFD trigger CFD Principle By Sobarwiki CFD in FADC 12/09/ /21

14 Struck SIS3316 FADC: Time Resolution 250 MS/s = 4 ns Timestamps Signal delay in 1m BNC cable Cosmic Run with PMT & LYSO σ 30ps 12/09/ /21

15 History of polarimetry 1 st test with COSY beam 2 nd Iteration Target wheel First test - 4 LYSO modules Moving arms 12/09/ /21

16 Current test setup Flench for up 120 LYSO modules X, Y, Z movement with rotation Temperature sensor Target wheel 12/09/ /21

17 DAQ & online analysis 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) 12/09/ /21

18 Online analysis results Spectra from individual channels Asymmetries Particle identification 12/09/ /21

19 Particle Identification: Deuteron beam, carbon target by Fabian Müller 12/09/ /21

20 Particle Identification: Deuteron beam, carbon target Preliminary! 12/09/ /21

21 Summary LYSO module assembling and testing procedure More then 50 module ware assembled and tested successfully First version of 64 ch voltage supply built and tested Independent 128 ch voltage monitoring system developed Data taken during recent test-experiments 5 successful beam times with extracted beam Outlook Further SW/HW development: improve parallelism, implement new tracking system, create GUI interface, Installing the polarimeter on the COSY ring in 2019 Building the pallet target chamber This work was supported by the Shota Rustaveli National Science Foundation (SRNSF) 23/08/ /21