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Studies on TH2 chamber

Studies on TH2 chamber. Michele, Maria, Givi , Joerg Weekly MicroMegas Meeting 12/3/2013. Overview. TH2 chamber Vs Txx chambers TH2 studies with X-ray Cosmic stand for 10x10 cm chambers TH2-Txx comparison with cosmic HV scan on TH2 chamber with FR4 frame

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Studies on TH2 chamber

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  1. Studies on TH2 chamber Michele, Maria, Givi, Joerg Weekly MicroMegas Meeting 12/3/2013 MicroMegas Weekly Meeting 2013/03/12

  2. Overview • TH2 chamber Vs Txx chambers • TH2 studies with X-ray • Cosmic stand for 10x10 cm chambers • TH2-Txx comparison with cosmic • HV scan on TH2 chamber with FR4 frame • HV scan on T3 chamber with Alu frame MicroMegas Weekly Meeting 2013/03/12

  3. TH2 chamber Vs Txxx chamber TH2 Chamber T3 Chamber RO Strips with screen printing deposition technique ~60 µm ~15/20 µm MicroMegas Weekly Meeting 2013/03/12

  4. Setup X-ray Gun In order to evaluate the TH2 chamber gain w.r.t. the others, a HV scan under X-ray irradiation has been performed • Electron current of the gun: ~1 mA • Monitor detector current from HV power supply • Chambers tested: TH2, T3, T8, Z1 MicroMegas Weekly Meeting 2013/03/12

  5. Current Measurement (X-Ray) From the HV scan with X-ray gun, it is evident that the TH2 chamber has about 10 Volts of shift w.r.t. the T3-T8 chambers. A few microns difference in heightof the amplificationregionisenoughtoexplainthisdifference MicroMegas Weekly Meeting 2013/03/12

  6. Setup – Mini Cosmic Stand Scintillator 1 TH2 Chamber T3 Chamber T7 Chamber 4 cm Lead Scintillator 2 MicroMegas Weekly Meeting 2013/03/12

  7. Setup – Mini Cosmic Stand • HV scan to evaluate Cluster charge response of TH2 w.r.t. T3/T7 chambers • HV scan replacing Aluminium frame with plastic frame on TH2 chamber • HV scan replacing Aluminium frame with plastic frame on T3 chamber • T7 Chamber used as reference MicroMegas Weekly Meeting 2013/03/12

  8. MicroMegas chamber with plastic (FR4) frame The idea is to monitor the chamber response using different frames. The metallic frame is close to the R.O. Strips and act like a capacitance and reduce the induced signal. FR4 frame Alu frame MicroMegas Weekly Meeting 2013/03/12

  9. HV scan TH2-T3-T7 Alu frame 520 V 510 V 500 V 530 V 540 V 550 V As for the HV scan with X-ray gun also in this case a systematic shift of the cluster charge distribution of TH2 w.r.t. T3-T7 is clear evident MicroMegas Weekly Meeting 2013/03/12

  10. HV scan TH2-T3-T7 Alu frame T3-T7 500 V TH2 510 V T3-T7 510 V TH2 520 V T7 520 V TH2 530 V T3-T7 530 V TH2 540 V T3-T7 540 V TH2 550 V Cluster Charge distributions of T3-T7 are well reproduced by TH2 applying 10 Volt more, as expected from calibration with X-ray MicroMegas Weekly Meeting 2013/03/12

  11. T3-TH2 HV with Alu or FR4 frame Any difference in cluster charge response are shown from T3 and TH2 using aluminum or FR4 frame. MicroMegas Weekly Meeting 2013/03/12

  12. Maximum Probably Value of Cluster Charge Distributions The M.P.V. from the Cluster Charge distribution is extracted with Landau function for each step and chamber. No difference for T3 and TH2 chambers are found using FR4 or Aluminium frame. T7 chamber as been used as reference and to normalize the result taking in to account also the variation of the environmental conditions. MicroMegas Weekly Meeting 2013/03/12

  13. Conclusions • New small (10x10 cm) MM chamber (TH2), with different thickness of insulating layer between copper and resistive strips have been built and tested. • Comparison of the chamber gain, under X-ray flux, with standard TXXX chambers has been performed. • The operating point of TH2 seems to shifted of 10 Volts w.r.t. the TXXX chambers • New small cosmic telescope, for systematic studies on 10x10 cm chambers, is now available in the gas lab. • HV scan performed with cosmic on TH2 and T3-T7 chambers confirm the shift on operating point found with the X-ray scan ( This kind of shift can be simply explained with few microns of difference of the amplification region ) • Cluster charge response seems to be independent from the frame (alu or FR4) adopted to close the small chambers MicroMegas Weekly Meeting 2013/03/12

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