[Solid_cc] WLS coated MAPMT performance question

[Zhiwen Zhao]

Hi, All
If you are receiving this, it means I added you into the 
solid_cc at jlab.org list.
It can be used to discuss shared topic between LGC and HGC
(I also setup a separated list solid_hgc at jlab.org for HGC only)

Michael
We had some discussion about the measured QE curve from H12700_03 coated 
with WLS and have some questions
In the attached plot, the green lines shows the QE curve you gave me.
1. why there is up and down wave like change between 250-300nm
2. above 350nm, it shows no change comparing to uncoated PMT. If the 
main feature of WLS is shifting light to UV, why QE won't drop at high 
wavelength?
3. Donal's group at UVa did similar coating, have you had any crosscheck 
with them or their result.

Thanks

Zhiwen



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