Star-fst-l mailing list

[Yi Yang <yiyang AT ncku.edu.tw>]

Hi Zhenyu,

Thanks a lot for the update. It's wonderful news that the inner sensor is now taking data and hopefully things will go smoothly. 

However, I would appreciate it if the technicians can elaborate more on their comments, for example Is this deflection observed on both the inner and outer sensors? How did they measure the deflection and how large it is? Is it acceptable for them in the point of view of assembling the sensors? 

It would be great to have more information, so we can think about how to improve our assembly procedure. Thanks a lot. 

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 Fri, Jul 10, 2020 at 3:54 AM Zhenyu Ye <yezhenyu2003 AT gmail.com> wrote:

The inner and outer sensors were mounted and wire-bonded on FST03. A comment from the technicians "bias bonds went in but noticed some deflection of the sensor”, which I think is related to the flatness of the hybrid surface.

We have been taking cosmic data with FST Inner sensor and IST staves since Tuesday afternoon at UIC. Xu is taking STAR shifts but has managed to find time to analyze the data but so far so good. Will send out results later.

Zhenyu

> On Jul 2, 2020, at 7:45 PM, Yi Yang <yiyang AT ncku.edu.tw> wrote:
>
> Hi Zhenyu,
>
> Thanks a lot for the feedback, we will discuss the possible reason for this shifting.
> My first guess is the mismatch of the CAD files. We will get it back to you later.
>
> 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 Thu, Jul 2, 2020 at 11:50 PM Zhenyu Ye <yezhenyu2003 AT gmail.com> wrote:
>
> > On Jul 2, 2020, at 2:40 AM, Yi Yang <yiyang AT ncku.edu.tw> wrote:
> >
> > Hi Zhenyu,
> >
> > It is good news. Thanks for the update.
> >
> > Could you please provide more details on the comments from the technician, like the placement is off in which direction, what are the reference points for these 500 and 200 microns (they are very different from our measurements).
> > "The inner chip placement was off .500mm so I needed to reposition. The outer placement was off .200mm”.
>
> "They were inboard toward the sensor area . I needed to slide the chips back  or outward. Michelle mention adhesion under some pads was not so good and created some issue but she got all in adjusting the powers.”
>
> > Yi, Han-Sheng, Pu-Kai, do you have the measurement results on the relative x and y positions of the hybrids w.r.t. mounting holes, and compare them with design?
> >
> > ==> We actually discussed this in our internal meeting, but so far we don't know how to measure the relative x and y positions. Pu-Kai and Han-Sheng are still working on this. But we didn't measure this for FST003.  (Pu-Kai and Han-Sheng, please correct me if I said something stupid...)
> >
> > 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 Thu, Jul 2, 2020 at 7:53 AM Zhenyu Ye <yezhenyu2003 AT gmail.com> wrote:
> > All the 8 APV chips were mounted and showed normal behavior in readout. I have instructed the Fermilab technicians to mount the Silicon sensors.
> >
> > One comment from the technician "The inner chip placement was off .500mm so I needed to reposition. The outer placement was off .200mm”.
> >
> > Yi, Han-Sheng, Pu-Kai, do you have the measurement results on the relative x and y positions of the hybrids w.r.t. mounting holes, and compare them with design?
> >
> > Best,
> > Zhenyu
> >
> > > On Jun 19, 2020, at 7:18 AM, Yi Yang <yiyang AT ncku.edu.tw> wrote:
> > >
> > > Dear all,
> > >
> > > We've finished the second prototype and shipped it to Fermilab directly per Zhenyu's request today. The DHL tracking number is: 4658055916 
> > > (https://www.dhl.com/en/express/tracking.html?AWB=4658055916&brand=DHL)
> > >
> > > Please find some details/pictures of this prototype here:
> > > 20200619_FST_Second_Prototype_YiYang.pdf
> > >
> > > Overall it looks pretty good (much better than the first batch).
> > > Thank you very much for being patient with us.
> > >
> > > 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
> > > +++++++++++++++++++++++++++++++++++++++++++++++++++
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>
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