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Development of LYSO detector modules for a charge-particle

EDM polarimeter

on behalf of the JEDI collaboration

Dito Shergelashvili, PhD student @ SMART|EDM_Lab, TSU, Georgia

Supv: Dr. David Mchedlishvili @ TSU; Dr. Irakli Keshelashvili @ FZJ

12th September 2018 | Ferrara

2/2112/09/2018

Ballistic Diamond

Pallet Target

Plastic Scintillators

1st sketch

Final design

Target chamberCalorimeter

Tracking system

Steps in Polarimeter Design

12/09/2018 3/21

Flash ADC

Stable voltage supply

Beam

Network

Server Computer

Switch

Online Analysis & Monitoring

Data for

offline analysis

Remote control & monitoring

TargetLYSO Modules

Polarimetry Overview

12/09/2018 4/21

SiPM connector

with bypass capsSiPMs, 20 µm pixel, 8x8 array

of 3x3 mm (SensL J – series)

64x14K ~ 900K pixel

3D drawingLutetium-yttrium

oxyorthosilicate

Lu2(1-x)Y2xSiO5

Aluminum Housing

https://sensl.com/products/j-series/

LYSO Module

12/09/2018 5/21

Silicon layer• Optical coupling

• Mechanical stability

• Radiation protection

3D printed plastic for

centering silicon

Teflon

1. Teflon – 50 µm

2. Tyvek ~ 100 µm

3. Smooth Mylar - 25 µm

4. Wrinkled Mylar - 25 µm

Tedlar 50 µm

Cut corners for

mechanical

fixation

Module Assembly

12/09/2018 6/21

3rd hand during assembling Ready for test

LYSO

2 x 50 µm Teflon

2 x 50 µm Tedlar

2 x 25 µm Kapton

SiPM array

Energy loss can be

estimated12

cm

LY

SO

mo

du

le

Enough depth to stop

270 MeV deuterons

Module Assembly

12/09/2018 7/21

LAN

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

Stand-alone test bench for LYSO lab tests

Modules inspection

12/09/2018 8/21

LYSO Test Data

60Co + 176Lu, 30 V Supply, 4 mV threshold, Left Down 3rd Module

1170 KeV

1330 KeV

2500 KeVpedesta

lInternal radiation

Nu

mb

er

of e

ve

nts

12/09/2018 9/21

22Na + 176Lu, 30 V Supply, 4 mV threshold, Left Down 3rd Module

pedesta

l

Due to the Internal

radiation

511 KeV

1275 KeV 1786 KeV

Nu

mb

er

of e

ve

nts

LYSO Test Data

12/09/2018 10/21

LYSO Module Energy Resolution

𝑹 =𝑭𝑾𝑯𝑴

𝑬(@ low energy !)

E [KeV] Resolution [%]

511 12.5

1170 7.8

1275 9.1

1330 7.5

1786 6.5

2500 4.5

LYSO Module Linearity

LYSO Module Linearity (@ low energy !)

12/09/2018 11/21

Flash ADC

Vary stable voltage supply

Beam

Network

Server Computer

Switch

Online Analysis & Monitoring

Data for

offline analysis

Remote control & monitoring

TargetLYSO Modules

Polarimetry Overview: FADC

12/09/2018 12/21

• 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 triggeringFPGAs

Struck SIS3316 FADC

12/09/2018 13/21

Amplitude threshold trigger vs CFD trigger CFD Principle

By Sobarwiki

CFD in FADC

Struck SIS3316 FADC: Time Resolution

12/09/2018 14/21

Cosmic Run with PMT & LYSO

Signal delay in 1m BNC cable

250 MS/s = 4 ns Timestamps

Struck SIS3316 FADC: Time Resolution

σ ≈ 30ps

12/09/2018 15/21

Target wheel

Moving armsFirst test - 4 LYSO

modules

1st test with COSY beam 2nd Iteration

History of polarimetry

12/09/2018 16/21

Current test setup

• Flench for up 120 LYSO modules

• X, Y, Z movement with rotation

• Temperature sensor

• Target wheel

12/09/2018 17/21

LYSO modules

16 ch. FADC(SIS3316)

Start & Stop counters

EMS cluster server

Event builder

Data manager

Analyses modules

Clients(access spectra)

VETO detectors

PC #1 PC #2

PC #3

Event builder, data manager and

client software parts are based

on CERN ROOT libraries

DAQ & online analysis

12/09/2018 18/21

Spectra from individual channels

Particle identification

Asymmetries

Online analysis results

12/09/2018 19/21

by Fabian Müller

Particle Identification: Deuteron beam, carbon target

12/09/2018 20/21

Preliminary!

Particle Identification: Deuteron beam, carbon target

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

23/08/2018

This work was supported by the Shota Rustaveli National Science Foundation (SRNSF)

21/21