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I received this request from Sean Cuevas, Kuraray Sales Rep to
meet to discuss Kuraray WLS fiber and our project needs.
He proposes meeting at BNL,
Thursday, October 25 at 9am.
Please let me know if anyone is interested in meeting with them.
Sean
-------- Forwarded Message --------
Subject:
Kuraray - Wavelength Shifting Fibers - Meeting Request
Resent-From:
stoll AT bnl.gov
Date:
Wed, 12 Sep 2018 19:55:16 +0000
From:
Cuevas, Sean <Sean.Cuevas AT kuraray.com>
To:
Sean Stoll <stoll AT bnl.gov>
Good
afternoon Sean,
I and two
of my colleagues from Japan will be in your area in October,
and we’d like to propose a meeting with you and your group.
The purpose of the meeting
would be to discuss your current activity using our fibers
(including commercial & developmental activity). From
our end, it will be myself, Mr. Yuuki Imamiya (Manager,
Methacrylate Division), and Mr. Katsuhiro Fujita (Leader,
Methacrylate Development Department).
I am proposing a meeting at
your facility in Upton on Thursday, October 25 at 9am. We
would request at least an hour of your time for discussion,
but would be grateful for any additional time over one hour.
Please let me know your
availability at your earliest convenience. I look forward to
hearing from you.
Regards,
Sean
Cuevas
Sales
Representative - Genestar™ PA9T
Kuraray
America, Inc.
2625 Bay
Area Blvd., Suite 600
Houston,
TX 77058
Email:
sean.cuevas AT kuraray.com
Office:
281.283.1777
Mobile:
713.560.2169
To learn
more about Kuraray, visit
www.kuraray.us.com.
Sean,
Thanks for the prompt reply. I did receive the message from
Osamu. It was was very helpful.
thanks,
Sean Stoll
On 8/21/2018 8:44 AM, Cuevas, Sean wrote:
Good morning Sean,
My counterpart in Japan tried to
respond directly to your email, but it looks like the email
address he sent to was incorrect. So, his email is below.
Dear Sean
Stoll - san,
I am one of technical of KURARAY scintillating fiber.
Your
question was transferred from Sean Cuevas of KURARAY
America.
I am trying to answer to your question.....
Y-11(200)
1mm fiber is doped with a high concentration of so
called K-27 fluorescent dye, 200ppm.
Because
the 1mm fiber can absorb a blue light efficiently more
than 90%, when emitted blue lights from a scintillator
go across the WLS fiber of 1mm diameter (refer to the
attached file).
On the
other hand, “Absorption and
Emission Spectra” on our web site
was measured with a very diluted solution, eg. a few 10s
ppm, using 10mm * 10mm quarts cell described in the
attached file.
The reason
why we used a very diluted solution is to measure the
intrinsic and real emission spectrum without no self -
absorption.
You can
see the
“Absorption and Emission Spectrum” of Y-11 has an absorption
– emission overlap between around
450-480nm wavelength.
These
wavelengths are, as we call, the range of self
–absorption.
If we used
a solution of higher concentration, eg. 200ppm using the
using 10mm * 10mm cell, we would get a very different
emission spectrum from the intrinsic and real, which
spectrum would be lost with the peak emission at 476nm
because of the self - absorption.
About
Y-11(200) fiber doped with 200ppm, that is the reason
why the peak emission at 476 disappeared at the 1m end
of fiber, as you observed.
Using this
fiber, this 476nm peak will disappear at only 1-10cm
from the point of illuminated with a blue light.
You can
see that this peak already disappears at 10cm
“Emission Spectra”
on our web site.
The second
reason why the emission spectrum changes at different
length, like
“Emission Spectra”
on the Y-11(200) fiber, is due to transmission loss of
polystyrene fiber.
The figure
of
“Transmission Loss” of
Y-11(200) fiber on the same page shows that the loss is
higher at a shorter wavelength with a steeply dipping
curve between 500nm and 600nm.
The trans
mission loss L(dB/Km) can be calculated to transparency
T(%) at X(m) by the equation T= 10^(-LX/10000)*100.
So shorter
components of the intrinsic spectrum are lost more
rapidly, surviving those of longer wavelengths.
Because
the emission spectrum at the fiber end is a
‘survived’
spectrum from the intrinsic emission passing through a
long fiber with different transparency every wavelength,
the
‘apparent peak wavelength’ observed from the end of a longer
fiber will goes longer.
Did I
answer to your question well?
If any
more or other technical questions or requests, please
let us know directly.
The last
two CC addresses of this e-mail are of the other
technical persons of KURARAY scintillation fiber.
Thank you
very much,
Osamu
Shinji
KURARAY
Regards,
Sean Cuevas
Sales Representative - Genestar™ PA9T
Kuraray America, Inc.
2625 Bay Area Blvd., Suite 600
Houston, TX 77058
Email: sean.cuevas AT kuraray.com
Office: 281.283.1777
Mobile: 713.560.2169
To learn more about Kuraray, visit
www.kuraray.us.com.
-----Original Message-----
From: Sean Stoll [mailto:stoll AT bnl.gov]
Sent: Friday, August 17, 2018 3:57 PM
To: Cuevas, Sean <Sean.Cuevas AT kuraray.com>
Subject: question about Y-11 fiber emission
Hi Sean,
We received the shipment of Y-11
fiber and are running some QA tests on it. A technical
question about Kuraray Y11 fiber. In the Kuraray product
brochure, the emission wavelength of Y-11 is given as 476nm.
This is consistent with the
"Absorbtion and Emission Spectra" graph (copied on attached
slide). There is a second plot that shows the spectra for
Y11 fiber measured for 4 different lengths of fiber. These
all peak at or above 500nm. The second graph is consistent
with what I see when I make the measurement as illustrated.
Can you explain why these spectra have
slightly different peaks (476nm vs 500nm)?
thanks,
Sean Stoll
--
Sean Stoll
Physics Associate
Brookhaven Nat. Lab
Upton, NY 11973
631.344.5331
--
Sean Stoll
Physics Associate
Brookhaven Nat. Lab
Upton, NY 11973
631.344.5331
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