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[Aschenauer Elke-Caroline <elke AT bnl.gov>]

Dear Zhenyu and Yi,

thanks, so your adhesives are having largely the same performance as I expected do not go beyond 40^oC.

So backing out with the Silicon close to the beam pipe is excluded.

So we need to find a way to increase the distance between the beam pipe and the Silicon or do not bake out which has a terrible impact on the background.

Cheers elke

On Aug 20, 2022, at 22:28, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:

Hi Yi

The bake out of beam pipe will be an extended period of time (~day).

I think what matters is the glass transition temperature of the adhesives

The temperature at which the epoxy adhesive changes from a rigid glassy state to a more pliable form is known as T_g. This thermal property acts as a good guideline of the ability of an adhesive product to stand up to sustained exposure to high temperatures.

Zhenyu

On Aug 20, 2022, at 9:00 PM, Yi Yang <yiyang AT ncku.edu.tw> wrote:

Hi Zhenyu,

Thanks a lot for adding the adhesives information for mechanical structure for us. 

I also checked the numbers and they are correct. 

However, the spec of LOCTITE EA 9359.3 AERO (for PEEK-to-PEEK) mentions that the "service temperature" is 93 C, but your conclusion of 40 degree C is not affected. 

Cheers,

Yi

+++++++++++++++++++++++++++++++++++++++++++++++++++
Yi Yang, Associate Professor
Department of Physics
National Cheng Kung University
Tainan, 701 Taiwan
E-Mail: yiyang AT ncku.edu.tw
Tel: +886-6-2757575 ext.65237
Fax: +886-6-2747995
Group Web: http://phys.ncku.edu.tw/~yiyang
+++++++++++++++++++++++++++++++++++++++++++++++++++

On Sat, Aug 20, 2022 at 11:44 AM Ye, Zhenyu <yezhenyu AT uic.edu> wrote:

Hi Elke

The adhesives have been used to mount hybrid onto PEEK, PEEK to PEEK, Silicon to Hybrid.

They have the following glass transition temperatures

Araldite 2011 for Hybrid-to-PEEK

Tg ca. 45 degree C

LOCTITE EA 9359.3 AERO for PEEK-to-PEEK

Tg ~51 degree C

LOCTITE ABLESTIK 2902 for Silicon-to-Hybrid

Tg 52 degree C

TDR11-1100 for Silicon-to-Hybrid

Tg 85 degree C

I would avoid having temperature above 40 degree C.

Zhenyu

On Aug 17, 2022, at 3:34 PM, Aschenauer Elke-Caroline <elke AT bnl.gov> wrote:

Dear All,

as discussed in one of the Tuesday fSTAR meetings, we need to understand what adhesives have been used in the construction of the FST and what is their temperature rating.

This is really important to receive this information quickly as this will define how we go forward with the potential bakeout for the fixed target if needed.

Cheers elke

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