E-mail: zhzhy@mail.ustc.edu.cn Manufacture and performance of three 200×200mm² thermal-bonding Micromegas prototypes Zhiyong Zhang（张志永）, Liang Guan（管亮）,

Presentation on theme: "E-mail: zhzhy@mail.ustc.edu.cn Manufacture and performance of three 200×200mm² thermal-bonding Micromegas prototypes Zhiyong Zhang（张志永）, Liang Guan（管亮）,"— Presentation transcript:

1 E-mail: zhzhy@mail.ustc.edu.cn
Manufacture and performance of three 200×200mm² thermal-bonding Micromegas prototypes Zhiyong Zhang（张志永）, Liang Guan（管亮）, Xiaolian Wang（汪晓莲）, Tianchi Zhao（赵天池） 核探测与核电子学国家重点实验室 中国科学技术大学近代物理系 2014/07/19-07/20

2 Outline Basic principle Manufacture Test system Performance Summary
山东大学 威海 第四届微结构气体探测器研讨会

3 • Basic principle Stainless steel mesh Y. Giomatnris, et al., MICROMEGAS: a high-granularity position-sensitive gaseous detector for high particle-flux environments, 1996 Nuclear Instruments and Methods in Physics Research A Y. Giomatnris, Development and prospects of the new gaseous detector “Micromegas”, Nuclear Instruments and Methods in Physics Research A 山东大学 威海 第四届微结构气体探测器研讨会

4 • Manufacture » Structure » Materials
Compressed air Stretched mesh Hot plane Spacers Readout PCB MicroMesh: 350 LPI woven stainless steel mesh pitch/wire diameter 75/24 μm tough polyester films with a permanent, dry (hot-melt type) adhesive on both sides The intrinsic volume resistivity of Ge (house temperature):59ohm.cm Germanium Plated PCB The readout PCB with a Germanium plated layer ( μm thickness, ~2MΩ/口) Thermal-bonding film spacers and frame are placed on the PCB. Double avalanche gaps are achieved on both side of the readout PCB. 山东大学 威海 第四届微结构气体探测器研讨会

5 » Bonding condition Active area (mm²) 200×200 Number of spacers 173
Mm01 Mm02 Mm_Ge Active area (mm²) 200×200 Number of spacers 173 200 ~200 Dimension of spacers (mm) 4 3 Spacer area (%) 5.43 3.53 3.85/3.34 Tension of mesh (N/cm) 19/20 19.5/19.5 Bonding time 70/70 69/69 65/65 Temperature (up) (oC) 116/118 116/115 120/117 Temperature (down) (oC) 138/132 130/130 144/139 Pressure (kg) 125/110 124/120 119/127 山东大学 威海 第四届微结构气体探测器研讨会

6 » Fabrication HV test in clean room After bonding 2014-7-20 山东大学 威海
第四届微结构气体探测器研讨会

7 • Test system Mobile scanning platform , x-ray gun, shielding box et.al.. Gas system DAQ system NIM crate and HV, logic plug-in board 山东大学 威海 第四届微结构气体探测器研讨会

8 • Setup Gas Mixture: Ar+CO2(93:7); Flowing gas mode;
Scanning with a ⁵⁵Fe source and a Cu-target x-ray gun; 山东大学 威海 第四届微结构气体探测器研讨会

9 • Performance » Spectrum of ⁵⁵Fe source (Mm01)
Gas Mixture: Ar+CO2(93:7); Kalpha: 5.9keV; Kbeta: 6.5keV; Fitted by triple gauss function + linear noise; 山东大学 威海 第四届微结构气体探测器研讨会

10 » Absolute gain (left) » Energy resolution versus gas gain (⁵⁵Fe source 5.9keV x-rays) (right) 山东大学 威海 第四届微结构气体探测器研讨会

11 ⁵⁵Fe source Scan direction:
» Gain non-uniformity ⁵⁵Fe source Scan direction: 20cm×20cm active area The gas gain is mainly depend on the avalanche gap，which is determined by the flatness of hot plate, heating time, and pressure etc. 山东大学 威海 第四届微结构气体探测器研讨会

12 Cu Kalpha x-rays source scanning (perpendicular to the strips):
» fine scan (Mm02) Cu Kalpha x-rays source scanning (perpendicular to the strips): 20cm×20cm active area Fine scan the active area with a Cu-target x-ray gun in a ~15mm range, about ± 5% non-uniformity is obtained, which will affect less for the spatial resolution, since the cluster size of avalanches is smaller than 1 mm. 山东大学 威海 第四届微结构气体探测器研讨会

13 Pulse shapes are fitted (range: 2~3*rise time) with sigmoid function:
» Pulse analysis Signals from preamplifier are digitized and recorded through Digital Oscilloscope for offline analysis Pulse shapes are fitted (range: 2~3*rise time) with sigmoid function: Signal Amplitude and Rise time are extracted from the fitted function. Rise time: 𝐴 𝑡 =− 𝑝 𝑒 𝑡−𝑝 1 𝑝 𝑝[3] Risetime:110ns 𝑇 10%−90% =4.39∗𝑝[2] 山东大学 威海 第四届微结构气体探测器研讨会

14 » Rate capability study
The Germanium layer is around connected to the ground. Cu X-rays tube(8KeV) source μm μm collimator Micromegas 山东大学 威海 第四届微结构气体探测器研讨会

15 The gain versus x-rays rate with different surface resistivity.
» Rate capability The gain versus x-rays rate with different surface resistivity. T. Alexopoulos, et.al., A spark-resistant bulk-micromegas chamber for high-rate applications, 2011 Nuclear Instruments and Methods in Physics Research A –118. 山东大学 威海 第四届微结构气体探测器研讨会

16 » Stability Source: 5.9keV x-rays Operated at a gain of ~9300;
Radiation rate:150Hz 山东大学 威海 第四届微结构气体探测器研讨会

17 • Summary ◊ The thermal-bonding method had been developed to manufacture the Micromegas, the manufacture and performance are presented. ◊ High gain and good energy resolution are obtained with the 200×200 mm² prototypes. ◊The rate capability and stability are also studied, further improvements need to be carried out. Further plan： ■ Try to improve the uniformity efficiency and rate capability of resistant anode chamber. ■ Develop the new structures like PIM, Backplane. ■ Setup a telescope for cosmic test of BGO ECAL of DAMPE, if it is needed. Thank you! 山东大学 威海 第四届微结构气体探测器研讨会