sPHENIX EMCal discussion

[BNL Mail <kistenev AT bnl.gov>]

Oleg, your fibers are double clad - right. The outer cladding is PMMA. I 
would not expect neither serious short term (we effectively do not care much 
of eating up external cladding layer) nor of long term stability issues (same 
reasons). There can be a bit of accelerated aging (again because of external 
layer) but it may even serve the purpose - killing cladding light). 
But those are just guesses - you already have modules 5 years old - direct 
comparison of the light yield then and now is probably one immediate answer.
Edward

Sent from my iPhone

> On 26 Jun 2019, at 19:51, Oleg Tsai <tsai AT physics.ucla.edu> wrote:
> 
> John,
> 
>   I did a quick search about compatibility of PMMA (cladding on fibers) 
> with chemicals,
> in general it is not recommended to use alcohol and looks like at elevated 
> T (during epoxy cure) it may be quite damaging (not clear what type of 
> damages),
> https://urldefense.proofpoint.com/v2/url?u=https-3A__marketing.industrialspec.com_acton_attachment_30397_f-2D006b_1_-2D_-2D_-2D_-2D_acrylic-2Dpmma-2Dchemical-2Dcompatibility-2Dchart-2Dfrom-2Dism.pdf&d=DwICaQ&c=aTOVZmpUfPKZuaG9NO7J7Mh6imZbfhL47t9CpZ-pCOw&r=ori09ca_gL08OyTCxMe8TXbcXP_40hDLclg-iQYISug&m=fJ0pU0IND-sA9gam_NumoYzC8ySg5rXC6e4JNZOm59Q&s=f40pBjDTOBeJn48uPNvsEwbc7GhVjLs0TmauIca04lw&e=
>  
> it is concerning, may be we should look at information from some other 
> sources 
> Oleg 
> 
> ----- Original Message -----
> From: "John Haggerty" <haggerty AT bnl.gov>
> To: sphenix-emcal-l AT lists.bnl.gov
> Sent: Tuesday, June 25, 2019 4:34:39 PM
> Subject: [Sphenix-emcal-l] Powder review
> 
> We will be reviewing the plan for UIUC procurement of tungsten powder 
> for the EMCAL tomorrow morning at 9am in 2-219 and on BlueJeans:
> 
>> https://indico.bnl.gov/event/6345/
> 
> -- 
> John Haggerty
> email: haggerty AT bnl.gov
> cell: 631 741 3358
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