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

[Jin Huang]

Great points!

Jin

______________________________

Jin HUANG

Brookhaven National Laboratory
Physics Department, Bldg 510 C
Upton, NY 11973-5000

Phone: 631-344-5898
______________________________



-------- Original message --------
From: Zhiwen Zhao <zwzhao at jlab.org> 
Date:12/15/2014  12:07 PM  (GMT-05:00) 
To: Jin Huang <jinhuang at jlab.org>, 'solid ec' <solid_ec at jlab.org> 
Cc:  
Subject: Re: [Solid_ec] WSL -> clear fiber bundle -> PMT in STAR BEMCal 

Hi, All

Other interesting things I noticed for STAR Barrel EMcal

1. fiber loops are embedded in each scintillator layer and preshower and shower are separated simply 
by grouping readouts.
2. each scintillator layer has slightly different size and it was done by machining, not molding. I 
wonder how that contributed to the total cost?
3. They "designed and built an intelligent Cockroft Walton PMT bases"
4. They used a shower-maximum-detector to get better position resolution.


Zhiwen

On 12/15/2014 10:49 AM, Jin Huang wrote:
> 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
> (doi:10.1016/S0168-9002(02)01970-8 <http://dx.doi.org/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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> Solid_ec mailing list
> Solid_ec at jlab.org
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