[Solid_ec] WSL -> clear fiber bundle -> PMT in STAR BEMCal

[Jin Huang]

Dear All,

 

I recently realized there is another WSL -> clear fiber bundle -> PMT
implementation for EMCal readout, similar to our proposed plan. It is built
for the STAR barrel EMCal (
<http://dx.doi.org/10.1016/S0168-9002(02)01970-8>
doi:10.1016/S0168-9002(02)01970-8, Fig 5). I do not recall that we discussed
this particular example though. Maybe there is some technique that we can
learn. 

 

Like our design, it used scintillating tile -> WLS fiber for sampling and
light readout. Then the WLS bundle is connected to 2.1 m long clear fiber
bundle to transport the light to outside the STAR solenoidal field for a PMT
readout. At the other end of the fiber bundle, another connector couple it
to the PMT box. In each of the two connectors, the diameter for the fibers
is increased to optimize for transmission efficiency. I was told that the
connector is manufactured in Michigan. 

 

However, comparing to STAR, we would require much higher energy resolution
(14%/sqrt(E) + 1.5% for STAR). Therefore, the SoLID EC could be more
demanding on the uniformity for the light transportation efficiency from
fiber to fiber. 

 

Hope this information would be useful. Expert on the STAR calorimeter
includes T.M. Cormier (ORLN) and O. Tsar (UCLA).

 

Cheers

 

Jin 

 

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Phone: 631-344-5898

______________________________

 

 

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