FST geometry and material
Updated on Fri, 2025-07-04 13:18. Originally created by videbaks on 2025-06-25 09:49.
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Design document by Felix (pptx)
Yuri looked at geometry difference before and after FST was installed.
see https://drupal.star.bnl.gov/STAR/system/files/Y2021vsY2025.pdf
Updated version (07/03/25) https://drupal.star.bnl.gov/STAR/system/files/Y2021vsY2025_0.pdf
Comments from Shinichi
[ From Zhenyu ]
We have published a NIMA paper on FST, https://arxiv.org/abs/2407.09952You may find some info useful.1) There are 3 identical FST disks installed at Z=152,165,179 cm. Their inner (outer) radius is 5 (28) cm.2) What are modeled in the simulation.*FST modules and support rings (see Figure 24)(Figure 2 shows the material budget of one FST module for perpendicular tracks)3) What are not modeled in simulation include*cables, and cable trays at 1/3/9/11 clock positions (Figure 24 and attached pic)*cooling tubes, coolant in the tubes, and cooling tube trays at 12 and 6 clock positions (see attached pic)*support frame (Figure 25)
[ From Xin ]
1) The FST disk material in the active region is included in GEANT3.2) The service material (support, cables) is not included in GEANT3.3) None of these materials is included in StiCA tracking for FXT data reconstruction.And also from my discussion with Zhenyu, it seems if we want to remove FST, it may take ~4 days
to do it. Zhenyu, please correct me if there is some misunderstanding. We may fold in these factors
when we consider the plan.In my opinion, if the removal is not taking too long, it would be best to spend a few days removing
the detector and taking clean data (even saying to lose 4 days of beam data).
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