Adding in the shielding to the east and west tunnels.  I still need to add in material surrounding the beam pipes for the shield walls between DX and D0 magnets.  I need more information about the DX magnets, because according to the drawings (see Akio's note below) the DX magnets should extend further back into the tunnel than the current geometry indicates.

 

LEFT: East tunnel, RIGHT: West tunnel.  Red is DX magnets.  Blue is shielding, floors, ceiling, ....

 

 

01/29/2010 Update 

 

Implemented CAVE as PGON with Rmax = largest dimension in cave and tunnel.

Added blocks of concrete to establish the true dimensions of the floor, ceiling and one wall of the cave and tunnel.

 

Figure 1 -- Left: view of STAR cave from south side of STAR, lying down, with head pointed to the west.  Right: view of STAR cave suspended from the ceiling with head pointed west.

 

 

 

 

Email from Akio requesting modifications to the CAVE and DX magnet geometries.

 

Copied here to include some drawings and discussion in the documentation.

Hello

While working on Forward hadron calorimeter (FHC) geometry in GSTAR,
we found the existing cavc/tunnel and dx magnet geometry files are not 
reflecting the reality. I've already talk with Victor (and Jason), but
we would like to request to update geometry files for those.

---

Here are some drawings from John Scheblein for east and west tunnels:

http://www.star.bnl.gov/protected/spin/akio/200908/tunnel/EAST-TUNNEL-WAH-1006.pdf
http://www.star.bnl.gov/protected/spin/akio/200908/tunnel/WEST-TUNNEL-WAH-1006.pdf

The tunnels in GSTAR are currently cylinder. Actual cave would be a
cube with

         279.65 + 329.95 = 609.6 cm wide in x (north/south)
         426.77 cm high in y (top/bottom)
         upto z=+-20m deep (in beam direction) is fine as is

The center of the tunnel is at

         x = - 25.15 cm
         y = + 426.77/2.0 - 127.00 = + 86.385 cm

from beam (x=0, y=0) i.e. off to north and up for both east and west.
This modification may requries careful look of the codes so that objects 
inside those tunnels stays in the correct location while center of tunnel 
won't be anymore at beam line.

---

In current geometry files, some of DX magnet elements are in, but
it does not include the outer "shell". Next are drawings of DX magnet 
vaccum vessel "shells" (thanks to John again!). We'll placing the FHC 
right next to it. So we would like to put those into our geometry.

http://www.star.bnl.gov/protected/spin/akio/200908/tunnel/
DX-lead-end.tiff                (head)
01055487-5-1%5b1%5d.tiff        (assembry)
01055489-5-1%5b1%5d.tiff        (lower shell)
01055490-5-1%5b1%5d.tiffmmq     (assembry upper shell)
01055491-4-1%5b2%5d.tiff        (upper shell)

Materials and geometry are all specified in those drawings.

--

Thanks!

-- OGAWA, akio Email : akio@bnl.gov BrookHaven National Lab. Physics Dep. 510A 1-179 Upton, NY, 11973-5000 Tel. 631-344-5293 

 

In addition to the request for the FHC studies, I know that there is interest in implementing the ZDC as built for polarimetry studies.  Yuri also pointed out that there are longer term questions about understanding the backgrounds at high luminosity from beam-line particles punching through the shielding.