sPHENIX HCal discussion

[Ron Belmont <ron.belmont AT colorado.edu>]

Hi Edward,

I don't quite understand the request regarding the foil and black paper.  These are opaque to visible light, so an LED scan isn't possible.  These are also extremely thin, so I wouldn't expect them to have any affect on the cosmics.  Can you explain a bit more?  In any case the paper and foil are still on the two small tiles, so those options are still available for them.  Regarding the plastic used by UNIPLAST, we don't have any of that, but if BNL wants to send some to us, it shouldn't be a problem for us to work with it.

Cheers,

Ron

On Tue, Oct 27, 2015 at 9:09 PM, Edward Kistenev <kistenev AT bnl.gov> wrote:

Thanks, Ron, pictures are always better then 1000 words. I would love also to get TH2 of the data in the figure. There are also couple of extra figures to see

- Light yield across the tile at 10, 50 and 90 cm distance from narrow side;

- Light yield along both legs of the fiber and along the line in the middle (between fiber legs) along the loop length;

- Light absorption length (lateral) vs X/Y position of a source (you may think that light is collected in two fiber points closest to emission point);

- add Al foil or Al’ed mylar on top surface and remeasure few points;

- same with black paper;

- same with Al foil and black paper then replace black paper by plastic used at UNIPLAST and try to see the difference;

I am confused by the depth of the valley along the tile central line. The party rule for the tile grooving was 1:2:2:2:1 (division of tile in lateral direction) - would be nice to understand this difference.

Finally fibers in the short tiles were 25+2*10 cm long - cladding light was dominant what explains x2 lower light yield. 

Thanks again

Edward

;

 

Edward Kistenev, PhD

PHENIX Physicist

On Oct 27, 2015, at 6:17 PM, Ron Belmont <ron.belmont AT colorado.edu> wrote:

Hi All,

I've uploaded a brief set of slides showing the first results from the big tile tests to my phenix/p/draft area: https://www.phenix.bnl.gov/WWW/p/draft/belmonrj/HCal/bigtile.pdf

Comments and suggestions are welcome!  If you're not on PHENIX but would like to have a look, please let me know and I'll send them to you directly.

Cheers,

Ron

--

-----------------------------------------------------
Ron Belmont
Postdoctoral Research Associate
University of Colorado, Boulder
ron.belmont AT colorado.edu
-----------------------------------------------------

_______________________________________________
Sphenix-hcal-l mailing list
Sphenix-hcal-l AT lists.bnl.gov
https://lists.bnl.gov/mailman/listinfo/sphenix-hcal-l

--

-----------------------------------------------------
Ron Belmont
Postdoctoral Research Associate
University of Colorado, Boulder
ron.belmont AT colorado.edu
-----------------------------------------------------