Laser test of the Prototype of  CEE TPC

Fei Lu

Shanghai Institute of Applied Physics,

Chinese Academy of Sciences

The 8th Conference of Chinese Advanced Gaseous Detectors

1．Introduction of CEE-TPC

2．TPC prototype I

3. TPC prototype II

4. Summary and future plan

Outline

CEE-TPC

CSRm冷却储存环

CSRe

SFC

SSC

SFC: 10 AMeV (H.I.), 17~35 MeV (p)SSC: 100 AMeV (H.I.), 110 MeV (p)CSRm: 1000 AMeV (H.I.), 2.8 GeV (p)

RIB

LL

2

RIB

LL

1

CSR‐External‐Target‐Facility Experiment

CEE

Lanzhou HIRFL‐CSR:

ZDC

TPC

Team Leader: Nu Xu,Zhigang Xiao       

CEE Conceptual Design

eTOF

MWDC

Si Pixel

iTOF

T0Superconducting Dipole

CEE-TPC

Physics

CEE：

Study the cold and dense nuclear matter:Study the quarkyonic matterHelp to look for the Critical Point

Phase Diagram of QCD : Symmetric Energy:

Study the symmetric energy at ρ0 ~ 3ρ0

CEE-TPC

Charged particles ionize gas inside. Ionized electrons drift toward pad plane.Pad Plane signals give positions and time of arriveal（3D）.Momentum from curvature of particle tracks in the magnetic field.Particle type from energy loss and magnetic rigidity

CEE-TPC

Simulation of Particle Identification

TPC working Principle

From MSU

Pad Plane Area 90cm× 100cmPads Number 12000Pads Size 10mm × 8 mmDrift Distance 80 cmGas 90%Ar + 10%CH4

E Field Intensity 200V/cmdE/dx Range Z<=2, π,p,d,t,HeMomentumResolution

5%

Two TrackResolution

3 cm

Multiplicity 200Event Rate 1000Hz

Readout Pad Plane

Side Panels

Cathode Plane Beam Window

Gas Electron Multipliers

GET Electronics

Conceptual Design of CEE‐TPCCEE-TPC

TPC Simulations Geant4 & Kalman Filter

Momentum Resolution:Tracks:

CEE-TPC can meet the requirements in the heavy ion collisions experiment at CSR

by Dr. Song Zhang & He Li

Prototype of CEE‐TPC

Field Cage:  10cm×10cm×10cm;          Pads:  64 ch

TPC Prototype I

Electronics:   Preamplifer, Shaper,  500M Hz Waveform Digitizer.  

Thick GEM:   0.2mm thick, from Dr. Qian Liu @UCAS 

Laser TestUV Laser ： 266nm，15mJ/pulse, 10Hz

TPC Prototype I

4.8 cm/us

TPC Prototype II Construction of prototype

32S Beam Test at CIAE

Beam 10enA150MeV 32S

Target Au，0.1 mg/cm2

TPC， 30 degree，60cm away，Beam in foil,12um

CIAE det.Zero degree.

TPC pre. Amp.64ch

Si pre. Amp.96ch

VME，(ADC+TDC)

Logic Ele.

Shaper 160ch

HV TPC gas control system ，0.1 atm.

TPC working gas，90% Ar+ 10% CH4

Vacuum system

TPC

Si Strip Det.

TPC Prototype II

TPC Prototype II Laser Test

The drifting velocity of Electrons.

Wen Huang et al., Nucl. Sci. Tech. (2018) 29:41

Gas Control from Limin Duan @ IMP, CAS

Test the prototype at three gas pressure conditions

The correlation between eneryloss and the heat quantity of Laser beam per pules

The average energy  resolution :  5.4%

TPC Prototype II Energy Loss Measurement 

Equipment from Huirong Qi @ IHEP, CAS

The energy loss dependence onThe voltage applied on GEM

The energy loss along the beam

Need calibration of the gain of the GEM.

TPC Prototype II Energy Loss Measurement 

The positon resolution in the X direction for each pad  is about 0.2mm, and the positon resolution in the Y direction for each pad  is about 0.5mm.

The track of five laserbeams in X-Z plane

TPC Prototype II 3D‐track resolution 

The track of two laserbeams in Y-Z plane

Summary and Future Plan

1. We have made a small prototype of TPC for CEE project. The test results meet the requirement in the heavy ion collisions experiment at CSR.

2. More R&D of the TPC and the beam test will be done.

3. We will build a SLEGS‐TPC in the future, to study the photonuclear reactions at Shanghai Synchrotron Radiation Facility.

4. We hope this CAGD collaboration can help us with the detectors and the GET electronics.