coating development and plans for filter cavity tests at tama daisuke tatsumi national astronomical...
TRANSCRIPT
![Page 1: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/1.jpg)
Coating development and plans for filter
cavity tests at TAMA
Daisuke TATSUMINational Astronomical Observatory of Japan
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 1
![Page 2: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/2.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 2
Filter cavity
![Page 3: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/3.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 3
Squeezing Light and Filter cavity
Squeezed vacuum injection is one of promising way to reduce the detector noises.
As a R&D activity for beyond the KAGRA detector, we have a plan to develop the filter cavity at TAMA.
![Page 4: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/4.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 4
A demonstration by eLIGO
2dB
![Page 5: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/5.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 5
Frequency independent squeezing
![Page 6: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/6.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 6
Solution: Filter Cavity
![Page 7: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/7.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 7
Frequency dependent squeezing
![Page 8: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/8.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 8
Loss requirement (2)
![Page 9: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/9.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 9
Loss requirements
![Page 10: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/10.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 10
Rough design of the filter cavity
Cavity pole freq. = 40Hz
Roundtrip Loss < 1ppm/m
Cavity length 10m 300m
Finesse 4E+5 4E+4Mirror reflectance 5N=99.999% 4N=99.99%
Cavity Loss 10ppm 300ppm
![Page 11: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/11.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 11
Coating developments
![Page 12: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/12.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 12
Low loss mirror developments
NAOJ and UEC
(Univ. of Electro-Communications)
collaborate with Japanese coating companies
for low-loss mirror coating
developments.
![Page 13: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/13.jpg)
Cross section of the multi-layered coating
Pictures are taken by TEM microscopein Univ. of Tokyo
The films have clear edges.Each layer is dense and uniform.
![Page 14: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/14.jpg)
X-ray Photoelectron Spectroscopy : XPS
Argon ion gun
Neutralizer
Soft X-ray
Soft X-ray
![Page 15: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/15.jpg)
O K
LL
O 1
s
Ta 4
d5
O 2
s
Ta2O5 film
X-ray Photoelectron Spectroscopy : XPS
measured by A. Ueda at Institute of Engineering Innovations,
University of Tokyo
![Page 16: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/16.jpg)
Ave. 8.0ppm
Scattering Loss
coated by SigmaKoki
world top class quality!
![Page 17: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/17.jpg)
At least the best performance in Japan
446 J/cm2 with 10nsec pulse
44.6 GW/cm2 (peak power density)
This is tolerance for one shot pulse.
KAGRA IOO requireshigh power density (> 1 MW/cm2) tolerance for 10 year continuous operation.
Damage Threshold
![Page 18: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/18.jpg)
2014/08/02 KAGRA f2f August 2014 @ Toyama Univ. 18
SUMMARY
Recent few years we develop
low-loss mirror
with Japanese companies.
By using the mirror
the filter cavity tests at TAMA
are planned.
![Page 19: Coating development and plans for filter cavity tests at TAMA Daisuke TATSUMI National Astronomical Observatory of Japan 2014/08/02 KAGRA f2f August 2014](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649f395503460f94c55a2d/html5/thumbnails/19.jpg)
End