[Halld-pid-upgrade] DIRC meeting tomorrow at 11 am

[Maria Patsyuk]

Hi,

please find the transmittance plots updated using the new dark current, for all cookies, here:

https://www.dropbox.com/s/hddfavyk5xiphs7/cookies_transmission_slides_newDC1.pdf?dl=0

The summary of the measurements is here:

https://gluexdirc.mit.edu/transmission-measurements

Conclusions in short are:

- dark current taken as measurement at 200 nm provides consistent results between two days, also the transmittance does not drop for wavelengths < 350 nm  as it used to
- transmittance for quartz windows is ~93% and flat, which is consistent with the Fresnel limit for this case (93%)
- FCAL cookie is very good
- Eljen cookies have lower transmittance than ours for wavelength < 400 nm
- our 2 mm thick cookies ensure relative transmittance > 97% (consistent with Belle II data) with both RTV615 and TSE3032 materials
- transmittance is consistent with data from manufacturers, Belle II data, and JLab data [1407.3258v1]
- cleaning/storing procedures should be refined, they affect measurements at ~ 4-5% level

Best regards,
Maria

On Dec 15, 2016, at 12:44 PM, Justin Stevens <jrsteven at jlab.org<mailto:jrsteven at jlab.org>> wrote:

Hi All,

We'll have a DIRC meeting tomorrow at 11 am.  You can find the agenda at https://halldweb.jlab.org/wiki/index.php/December_16,_2016_PID_Upgrade.

-Justin
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