Report of recent DSSD status R. Kiuchi (SNU) 2012/10/20 E07

Presentation on theme: "Report of recent DSSD status R. Kiuchi (SNU) 2012/10/20 E07"— Presentation transcript:

1 Report of recent DSSD status R. Kiuchi (SNU) 2012/10/20 E07 meeting @KEK

2 Sci.PMT Cooling box DSSD SSD Final try of DSSD (2012July) Cosmic-ray ・ Cooling of DSSD by dry ice ・ For confirmation, set SSD between DSSD and scintillator ・ 3 sci. coincidence of cosmic-ray I have checked all events which have on hits on SSD(due to setting efficiency ~ 70%), but there is no clear hits on DSSD (after last E07 meeting)

3 Pedestal distribution & IV curve of DSSD @ cooling RMS became SSD level !

4 Miss-Line on DSSD Recently discovered by Watabe-san REPIC just repaired it. (only DSSD #1)

5 DSSD – photo II. Line route “GND2” ”GND1” +1.25V 0V0V

6 SSD – photo I. ### 比較のためにＳＳＤの写真も撮ってみ た 糊がボンディング上にある ためＤＳＳＤの写真よりも 不鮮明

7 Line route SSD – Photo II. “GND2” “GND1” +1.25V 0V0V

8 Bias voltage and current Before repair After repair almost same

9 Pedestal Noise(RMS) distribution between 2 APV chips and 1 new APV chip

10 Comparison of RMS Bias vol. =0V Bias vol. =40V Bias vol. =80V Bias vol. =0V Bias vol. =80V before after

11 Summary ・ It seems depletion of sensor part itself has some problem. ・ For (my) confirmation, I am going to try cosmic-ray test. ・ Currently the performance is not good, and we should choose SSD.

12 DSSD – 写真 １ Ｎ側の APV25 チップへのボンディング 写真 ### DSSD”1” 中央部分

13 SSD – 写真２ 下側のパッ ド 上側のパッ ド ・４箇所で半田付けされているに見 える ・２箇所で半田付けされているに見え る