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

Dear All,

I REQUEST AGAIN a document on the Is which specifies all sizes, locations and requirements.

elke

On Sep 11, 2019, at 12:22, Zhenyu Ye <yezhenyu2003 AT gmail.com> wrote:

Begin forwarded message:

From: "Ye, Zhenyu" <yezhenyu AT uic.edu>

Subject: Re: Spacing of FST Planes

Date: September 11, 2019 at 1:22:14 PM CDT

To: "Sharma, Rahul" <rsharma AT bnl.gov>

Cc: "Scheblein, John A" <schebs AT bnl.gov>

Hi Rahul,

The Z-locations of the sensors of the 3 FST disks in simulation are z=140.0, 154.0, and 168.0 cm. Putting them at these locations allow a maximum distance among the stations and a full coverage for 2.5<eta<4 w.r.t. collisions at z=0cm.

I have to say that there may be a possibility to increase the distances among the disks to increase the level arm length and thus improve the tracking performance (but at the cost of losing full 3-silicon disk acceptance coverage). We will study this once Daniel’s new tracking code is fully ready.

Best,
Zhenyu

On Sep 11, 2019, at 12:49 PM, Sharma, Rahul <rsharma AT bnl.gov> wrote:

Hi Zhenyu,

I've a couple of conflicting numbers for spacing of FST discs in my models. Can you please send me the distance of all 3 planes from IR from your record. We are working on detail design and it will be good to have correct numbers so that we don't need to change it again.

- Rahul

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