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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Dear All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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 (<a href="http://dx.doi.org/10.1016/S0168-9002(02)01970-8" target=doilink><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:#316C9D;border:none windowtext 1.0pt;padding:0in;background:white;text-decoration:none'>doi:10.1016/S0168-9002(02)01970-8</span></a>, Fig 5). I do not recall that we discussed this particular example though. Maybe there is some technique that we can learn. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hope this information would be useful. Expert on the STAR calorimeter includes T.M. Cormier (ORLN) and O. Tsar (UCLA).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cheers<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Jin <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>______________________________<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Jin HUANG<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Brookhaven National Laboratory<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Physics Department, Bldg 510 C<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Upton, NY 11973-5000<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Phone: 631-344-5898<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>______________________________<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>