Simulation and progress of TPC prototype for the future collider

Huirong Qi, Zhiyang Yuan, Yiming Cai, Yue Chang, Jian Zhang, Yulan Li, Zhi Deng, Hui Gong, Jin Li, Yuanbo Chen, Hongyu Zhang,

Ye Wu, Xinyuan Zhao, Yuyan Huang, Haiyun Wang, Yulian Zhang

2019.10.18

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Outline

Requirements Simulation of IBF at Z TPC prototype R&D Summary

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Three Detector Concepts (CEPC CDR) Baseline: Silicon + TPC FST: all-silicon tracker IDEA: Silicon+Drift chamber (DCH)

ArXiv:1811.10545

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TPC requirements for CEPC TPC detector concept: Under 3 Tesla magnetic field

(Momentum resolution: ~10-4/GeV/c with TPC standalone)

Large number of 3D space points(~220 along the diameter)

dE/dx resolution: <5% ~100 µm position resolution in rφ

~60µm for zero drift, <100µm overall

Systematics precision (<20µm internal)

TPC material budget <1X0 including outer field cage

Tracker efficiency: >97% for pT>1GeV 2-hit resolution in rφ : ~2mm Module design: ~200mm×170mm Minimizes dead space between the

modules: 1-2mm

Overview of TPC detector concept

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Brief summarize

Compare with ALICE TPC and CEPC TPC

ALICE TPC CEPC TPC

Maximum readout rate >50kHz@pp w.o BG? Gating to reduce ions No Gating No Gating Continuous readout No trigger Trigger? IBF control Build-in Build-in IBF*Gain <10 <5 Calibration system Laser NEED

TPC limitations for Z Ions back flow in chamber

Calibration and alignment

Low power consumption FEE

ASIC chip

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Resolution along drift length (simulation)

Moment resolution 10^(-4)

Zhiyang Yuan

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Simulation of IBF effect

Simulation Based on the ILC-KEK codes Re-established model Validated with 3 ions disks Still more works with the

simulation module till now

Zhiyang Yuan

- 8 - Deviation in Φ at CEPC Higgs run with

3×1034cm-2s-1 (Lumi.)

Simulation of deviation with IBF (k=Gain×IBF) @CEPC Zhiyang Yuan

- 9 - Deviation in Φ at CEPC Z pole run with

17×1034cm-2s-1 (Lumi.)

Simulation of deviation with IBF (k=Gain×IBF) @CEPC

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Update results of IBF from detector module

IBF×Gain has the limitation ratio from the detector R&D at high gain. How to do it next ? Any new ideas? (Lower gain and no IBF)

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Readout of TPC

Standard charge collection ASIC chip with sensors

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Pad TPC and Pixel TPC

Particle Track

Standard charge collection Pad: 1.0 x 6.0 mm^2

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Pad TPC and Pixel TPC

Particle Track

Pixel: 55x 55 μm^2

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Idea: intermediate solution between pads and pixels for CEPC at Z Clusters contain the primary information of the ionisation Can we find a solution to resolve clusters? Some R&D for pixel TPC:

What is the optimal pad size to – improve double hit and double track resolution – do cluster counting for improved dE/dx? → Pixel size:(200μm or large), significant reduce cost Almost without IBF (Gain< 2000) Micromegas + ASIC Chips (Our option) GEMs + ASIC Chips

→ Some R&D at DESY

CEPC workshop@ Novermber Kees from NIKEF will attend and discuss some possible collaboration.

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TPC prototype R&D Laser dE/dx (蔡一鸣报告) Low consumption ASIC (刘伟报告) Cooperation

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Why we need the laser?

The drift velocity is measured with precision via the signal produced by stray laser light on the aluminised central electrode (by photoelectric effect)

The drift time gradient due to the pressure gradient is observed

ALICE TPC drift velocity update results

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Experimental setup using a laser

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Electronics from Tsinghua Amplifier (READY)

CASAGEM chip 16Chs/chip 4chips/Board Gain: 20mV/fC Shape time: 20ns

DAQ (READY)

FPGA+ADC 4 module/mother board 64Chs/module Sample: 40MHz 1280chs

FEE Electronics and DAQ setup photos

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Preliminary test with the laser

Readout board, 128 Channels electronics, DAQ and laser mirror and PCB board have been done and assembled

TPC barrel mount and re-mount with the Auxiliary brackets

TPC preliminarily tested with 55Fe and the different power laser beam

Optimization of the laser studied

55Fe Laser

55Fe Laser

55Fe Laser

55Fe Laser

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Laser track test@128chs

Preliminary results of Laser tracker energy spectrum and tracker

Drift length: 27mm Pad row#4

Pulse

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International cooperation

LCTPC collaboration group (LCTPC) Singed MOA and joined in LC-TPC collaboration @Dec. 14,2016 CSC funding: PhD Haiyun jiont CEA-Scalay TPC group(6 months) Joint beam test using Micromegas and GEM modules Planned beam test by TPC prototype at DESY in 2020

Beam test in 2019 Beam test in 2016

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Summary and further R&D

Requirements and critical challenges for CEPC: High momentum resolution and position resolution Continuous beam structure and the ~25ns time space

Continuous IBF module for CEPC: Continuous Ion Back Flow supression Key factor: IBF×Gain=5 and leas than (R&D) Low discharge and the good energy spectrum

Prototype with laser calibration for CEPC : It needs very sophisticated calibration in order to reach the desired physics

performance at Z pole run Prototype has been designed with laser (Developed in IHEP and Tsinghua) Test with the TPC module and prototype in 1.0T magnetic field

Low power consumption ASIC chip: FEE electronics and DAQ collaborated with Tsinghua University Less than 5mV per channel

Still, many critical questions and challenges to face

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Thank you for your attention !