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[Zhenyu Ye <yezhenyu2003 AT gmail.com>]

Hi Rahul, 

Would it be ok if the Silicon disks have an inner radius of 4.75 cm? What is 
the clearance in this case?

Thanks,
Zhenyu


> On May 9, 2019, at 8:31 AM, Sharma, Rahul <rsharma AT bnl.gov> wrote:
> 
> Hi Yi,
> Yes that is including the wrapping and thermocouple cables that have to be 
> left on place around beampipe. It also includes the clearance we need to 
> make the mechanism of discs sliding around the beampipe work.
>  
>       • Rahul
>  
> From: Yi Yang <yiyang AT ncku.edu.tw> 
> Sent: Wednesday, May 08, 2019 6:06 PM
> To: Aschenauer, Elke <elke AT bnl.gov>
> Cc: Christie, William <christie AT bnl.gov>; Sharma, Rahul <rsharma AT bnl.gov>; 
> star-fst-l AT lists.bnl.gov
> Subject: Re: [Star-fst-l] beam pipe radius
>  
> Dear Elke,
>  
> Gerard just mentioned to me that I misread the drawing. 
> The radius of the beryllium tube is 1.5 inches (3.810 cm). 
>  
> Zhenyu and I remember that Rahul mentioned the radius of the beam pipe is 
> about 5 cm, so I believe this number included all the wrapping stuff I 
> mentioned. 
>  
> To simplify my question to Rahul: is it okay if the inner radius of the 
> silicon tracker is 4.75 cm (1.87 inches)? 
>  
> Cheers,
> Yi
>  
> 
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> Yi Yang, Assistant 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: 
> https://urldefense.proofpoint.com/v2/url?u=http-3A__phys.ncku.edu.tw_-7Eyiyang&d=DwIFaQ&c=aTOVZmpUfPKZuaG9NO7J7Mh6imZbfhL47t9CpZ-pCOw&r=8ygAAI6gQzVe9hFCRdEAO5MwBJh2ID34fiwLpV3P1Xo&m=br0AocgwG-SZoNGjC6sqqPKU0Ov9oOA_YtZ29hOzp2M&s=Z7ra0wxFHD1NchcejqegAL5K8Lry3f_f1opTUS7ViuM&e=
>  
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>  
>  
> On Thu, May 9, 2019 at 3:03 AM Aschenauer Elke-Caroline <elke AT bnl.gov> 
> wrote:
> Dear Yi,
>  
> are you thinking about the bake out blankets? If yes they need to get 
> removed before you would be able to install the Silicon detector, also they 
> seem to be thicker then 0.1 cm.
> Rahul any idea what Yi is referring to.
>  
> cheers elke
>  
>  
> On May 8, 2019, at 10:29, Yi Yang <yiyang AT ncku.edu.tw> wrote:
>  
> Dear Bill & Rahul,
>  
> Elke kindly forwarded a beam pipe drawing which is going to use in the 
> forward upgrade. 
> The radius of the beam pipe is 4.625 cm. 
> However, we remember Rahul mentioned that the beam pipe is also wrapped by 
> something, so we are wondering if it is okay if the inner radius of silicon 
> track is 4.75 mm. 
> Could you please confirm it? Thanks a lot.
>  
> Cheers,
> Yi
>  
> 
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> Yi Yang, Assistant 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: 
> https://urldefense.proofpoint.com/v2/url?u=http-3A__phys.ncku.edu.tw_-7Eyiyang&d=DwIFaQ&c=aTOVZmpUfPKZuaG9NO7J7Mh6imZbfhL47t9CpZ-pCOw&r=8ygAAI6gQzVe9hFCRdEAO5MwBJh2ID34fiwLpV3P1Xo&m=br0AocgwG-SZoNGjC6sqqPKU0Ov9oOA_YtZ29hOzp2M&s=Z7ra0wxFHD1NchcejqegAL5K8Lry3f_f1opTUS7ViuM&e=
>  
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>  
>  
> On Wed, May 8, 2019 at 8:39 AM Aschenauer Elke-Caroline <elke AT bnl.gov> 
> wrote:
> Dear Yi,
>  
> sorry I wanted to sent this already earlier. Here is the technical drawing 
> from John Scheblein of the STAR original beam pipe we use now and will use 
> for the forward upgrade.
>  
> cheers elke
>  
>  
>  
> On May 7, 2019, at 17:54, Yi Yang <yiyang AT ncku.edu.tw> wrote:
>  
> Dear Elke & Zhenyu,
>  
> I am wondering if you have chance to get the information of the radius of 
> the beam pipe from Rahul? 
> I think the dimensions of sensor and hybrid are almost fixed, so the only 
> dimension is missing is the radius of the beam pipe. 
> Thanks a lot.
>  
> Cheers,
> Yi
>  
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> Yi Yang, Assistant 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: 
> https://urldefense.proofpoint.com/v2/url?u=http-3A__phys.ncku.edu.tw_-7Eyiyang&d=DwIFaQ&c=aTOVZmpUfPKZuaG9NO7J7Mh6imZbfhL47t9CpZ-pCOw&r=8ygAAI6gQzVe9hFCRdEAO5MwBJh2ID34fiwLpV3P1Xo&m=br0AocgwG-SZoNGjC6sqqPKU0Ov9oOA_YtZ29hOzp2M&s=Z7ra0wxFHD1NchcejqegAL5K8Lry3f_f1opTUS7ViuM&e=
>  
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>  
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>  /    '. |               Elke-Caroline Aschenauer               =
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>   \,_  `-/        Brookhaven National Lab                         +
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