================================ From: KEKUX::"tyndel@v2.rl.ac.uk" 6-DEC-1996 03:07:09.10 From our side in DELPHI, we glued carbon-fibre and Kevlar stiffening rails onto all detector modules (including the double-sided) and saw no effect on the detectors. We have also glued detectors back-back as planned in ATLAS. Glueing in DELPHI Modules in DELPHI are built into ladders using C Fibre or Kevlar beams as stiffeners. These have been glued to both p and n sides of the detectors. The total area of glue contact is approx 2 -3 cm**2 (ie ~ 10% total area). Todate this has not caused any problems. The rafiation recieved in LEP is minimal (less than a few Krads) Mike ======================= From: KEKUX::"HFWS2@SLACVM.SLAC.Stanford.EDU" 7-DEC-1996 04:43:38.35 in Zeus we use p-side detectors and glue the edge of the backside (aluminized!) onto a PCB. This is about 5mm from the edge. No increased currents were found. Again: the backside is aluminized, and I would be worried if one would see an effect! We use conductive glue to make the bias connection to a trace on the PCB. ========================= From: KEKUX::"Ogmundur.Runolfsson@cern.ch" "Ogmundur Runolfsson" 6-DEC-1996 22:15:13.71 Yes we have glyed some 1000 pad detectors and 150 microstrip detectors on the junction side using Silicon glue Dow Corning Q1-9226. More details are given in the report i presented at the Hiroshima symposium last year. We can positively state that after we had found out how to prevent damages as described in the report no pad detectors suffered from the gluing, eg. no increase of leakage current. In case of the microstripo detectors we can not exclude that some detectors have suffered but it was certainly a minor problem most ladders did not draw more current than individual detectors before gluing. Greetings Ogmundur Runolfsson We found no effect independent of if the glue was on a metal or na the passsivated oxide surface. Ogmundur ======================== From: KEKUX::"chaber@Csa3.LBL.Gov" 7-DEC-1996 01:29:38.59 I think the real issue here is the effect of the glue over the guard ring structure on the backside. In this sense we would only use a glue which is shown to be compatible with application on p implant silicon strips themselves. In terms of the application on the metallized area over the main p implant, we want a material which is known to not etch or corrode aluminium. Carl Here is some information on glues: 1. Hexcel 5313 Epolit resin/hardener: This was used on the back side of SS DC and AC coupled p in n bulk devices without any problem. 2. Hexcel 5313 Epolit resin/hardener: This was tested on the strip side of SS AC coupled p in n bulk devices. Visually it seen to react chemically with the surface. Significantly increased electronic noise was measured on strips which had this glue on it. 3. Araldit AW106/HV953: This was tested on the surface of pnDC75 detectors and no increased leakage as seen. 4. Araldit AW106/HV953: This was used to glue ceramic hybrids to the strip side of pnDC75, npDC75, and nn75AC detectors for H8 (all the LBL modules). Noise was in spec. This seems OK. We did not irradiate after gluing except for ATT4. ATT4 had many bad channels but was also damaged electrically (as you know) so the data are not conclusive with regard to the irradition issue. 5. Abelbond 84-1LMITL: This is a silver filled conducting epoxi. It was used to glue pnDC75 detectors back to back (LBIC1 and 2). One module had an excessively high leakage current but this could be due to other factors. 6. Tracon 2902: This is a 2 component silver filled conducting epoxi. Is was used for spot gluing of conductors on the back of detectors of all types with no back effects seen. 7. Tracon 2151: This is a 2 component thermally conducting and electrically insulating epoxi. It was used to glue PG on the back of nnAC75 devices from Micron. Large bulk current was seen but cannot be clearly attributed to this product. 8. Norland 121 UV cure: This was used to butt join all types of ATLAS prototypes with no bad effect seen. That's it. Carl ============================ From: SMTP%"litke@afal08.cern.ch" 12-DEC-1996 23:21:27.28 In the old vertex detector the z hybrids were glued directly onto the detectors. The glue used was a two-component epoxy called Araldite (don't know the exact type but I can find out). We never had a problem of any kind with this glue. In the new vertex detector the z fanouts were glued directly onto the detectors. The glue used was again some type of Araldite (I was told that it is the kind you get at the supermarket -- nothing special). There has been no problem with this glue. I am not aware of any radiation tests for these glues, which were not important for LEP but might be important for the LHC. For completeness, I should mention that there was a special type of epoxy which was used improperly, which never set (even after several months), and which was blown onto our readout and line-driver chips by the cooling air, and destroyed them. However, this glue was NOT the Araldite mentioned above. In summary, my main concern would be the effects of radiation, but perhaps this has already been studied. You should contact the OPAL people, who have a lot of experience gluing two single-sided detectors together to make a double-sided detector. Regards, Alan ============================= OPAL: Tony Carter Tiny spots of glues on the p-strip surface to glue reinforcing rails. No visible deterioration. ============================= PIN photo diodes irradiated in CERN PS up to 2.2 x 10^14 proton/cm^2 K. Wyllie Four pairs of diodes were prepared: one being as it was and the other had a glued ceramics on it. The diode had a metalized p-implant area of 5.6 mm x 5.6 mm, on which a ceramic disc of 3 mm in diameter is glued (with ARALDITE 2011). After the proton irradiation of a fluence up to 2.2 x 10^14 p/cm^, no deterioration in leakage current was observed in the glued samples in four pairs. ============================= From: KEKVAX::UNNO "Y. Nobu Unno, unno@kekvax.kek.jp" 6-DEC-1996 16:12:15.48 To: @GLUE CC: UNNO Subj: Effect of glue on silicon strip detectors Dear friends in high energy physics; In the ATLAS experiment at LHC, we are developing a silicon strip detector module/ladder for the semiconductor tracking system. In the development, one of the option of building the module is to glue two single-sided detectors back-to-back. In this, the single-sided detector is different from the ordinary single-sided detector. The ordinary single-sided detector is made to have "p-implant strip" on "n-silicon bulk". The single-sided detector which we, ATLAS, are considering is "n-implant strip" on "n-silicon bulk" with our reasoning. Consequently, the p-n junction is on the backside (while the ordinary p-on-n single-sided has the ohmic contact in the backside). Since two n-on-n single-sided detectors have to be glued together in the backside where the p-n junction is, we would like to be informed any experience of the effect of glue on the junction side (of course, including the glue on the ohmic side). If you could help us of gathering the information, we would appreciate your cooperation very much. If you have experience of the effect of glue, would you e-mail me (1) Situation how you are using the detector and the glue. For this if a (hand-) drawing helps, I would very much appreciate it to have. Please FAX the drawing to Yoshinobu UNNO Physics, KEK FAX: +81-298-64-2580 (2) The effects you have experienced, including "No observable effect". If there is a radiation damage data (gamma, charged particles,...) in interaction of detector-glue, it will be a valuable information, too. (3) Any other comments A decision making meeting is planned to be held in the week of Dec. 16, 1996 (which is only a week from now). If you can help us, we would like to have the info by the middle of next week, desirably around Dec. 11(Wed), 12(Thu). Thanks very much for your help in advance and Best regards, Y.Nobu UNNO The module convenor ATLAS SCT group P.S. If you are not the right person and can forward this inquiry to the right person, please do forward and would you advice me who he/she is... The previous inquiry is sent to you as the contact of ! Delphi - Mike_Tyndel ! Opal - Tony_Carter ! Aleph - moser@afmp02.mppmu.mpg.de ! L3 - Ogmundur.Runolfsson@cern.ch, erik_perrin ! CDF - Carl_Haber, Jeff_spalding ! D0 - Mark_Strovink ! Zeus - Hartmut_Sadrozinski ! Others - Hans_Ziock Sorry for short in introduction. Y.Nobu UNNO