each fiber can two spitted modes. Numbers of observed modes are less than 32.
And Q of modes looks on the order of 10^4 at least. It is fine.
Photos are here.
https://photos.google.com/u/1/share/AF1QipOFv2iLIn9xQklJQfW1mfxyVm3_I24nelpbNVhRn9qe7Uci-o9ppx4GO0Nid1sFMw?key=dXNONHlqV1dWMlEtU1V4RVh0bGRnWmV4elhYTGt3
https://photos.google.com/u/1/share/AF1QipOFv2iLIn9xQklJQfW1mfxyVm3_I24nelpbNVhRn9qe7Uci-o9ppx4GO0Nid1sFMw?key=dXNONHlqV1dWMlEtU1V4RVh0bGRnWmV4elhYTGt3
Kimura-san and Kazuhiro checked leakage at EXC; flange of cross tube above cryostat and small flange on side of cryostat.
The latter has no problem. But we found leakage on former. As Takashi Uchiyama suggested,we add 5 cramps and fasten all screws
(80 Nm).
Photos are here.
https://photos.google.com/u/1/share/AF1QipNbyPYSr0R5Jugb_d38anDCh6WYZObmVld6-9zV4Zk98dD1eFSX0Qi5Mj44XcNZfw?key=RVpBR1VzZ0hzVk4tMFBZak5FZ0VpZEdVU2x4WjFB
ears on mirror.
(2)They close box (useful comments from Takafumi).
(3)Then this box which include ITMY is in pelican case now.
(4)Tulip television came. Kuromiya and Kazuhiro faced interviewed.
(5)Tomorrow morning (9am). Takyuki pick up. Kazuhiro comes. Tulip television comes again.
ETMY was transported from University of Toyama to KAGRA site.
https://photos.google.com/u/1/share/AF1QipObQWluMt6zI8mT2xCHFYhwMtlkLQ1nkl_HdTHWlsRf-VelDwjeDH_qDkDJzZaVZA?hl=ja&key=d3lDaTZtODRRaUIxTWdjbkw2WHdfWnNZeEI0QW9B
Yoshioka-kun, Kuromiya-kun (B4, University of Toyama) and Furuta-san supported.
Now case which includes ETMY is under table behind EYC.
in other word, ETMX, was delivered around 9 am today (Friday, 26th of Jan 2018) at University of Toyama for
HCB (bonding of sapphire ears and magnets).
Although I was worried about terrible weather (heavy snow !) around Toyama,
actually, no problems and delay happened.
I would like to appreciate support of administration office of faculty of science and
efforts of young persons (Ushiba(ICRR), Kitazawa, Yokokawa, Yoshioka(Uniersity of Toyama)).
HCB mission will be started on Monday of the next week. According to current schedule,
ETMX will arrie at KAGRA site on 9th of March (Fri).
Here photos are.
https://photos.google.com/share/AF1QipN5f8ODPphztNA_wLHFUg1WpsYxpkwjxQLtzVofX2IRV9jLm7bLydBIpvdRqYXfUQ?hl=ja&key=UmtUbDcwZU93OGtpZGhkbEJMaTA2WE5MMGphRVhn
Thanks !
https://photos.google.com/share/AF1QipMn0m7eBT28Laf97brhHGAQeqPK1yQfdJrrXSbTYFHrysHEEUoNcjzwuHuNCrbftw?hl=ja&key=ZzFXWnZnTC1nNTZ0a0VOWU83Yl96M3VSX0sxVFhR
HCB mission will be on week of 18th of September.
Yesterday(27th of June 2017), Luca investigated accelerometer at University of Toyama.
In principle, it is OK.
Today (28th of June 2017), Luca and Kazuhiro (and Miyata-kun, undergraduate student) brought
accelerometer and apparatus to KAGRA site.
Luca checked accelerometer on table in front of clean booth for cryostat.
It works.
So, we installed in cryostat.
However, output looks noisy. Cables connected to cryostat directly could be an issue
because we did not use it in test on the table.
We brought out acceleroemter from cryostat again.
Our intention is as follows;
Performance check outside cryostat via above cable on Friday (the day aftr tomorrow).
Photos are here.
https://photos.google.com/share/AF1QipNns91ll_U0DRfd22Xmmj5G1DobZNAcVRx95u0drHTDkPXU7aFICkvE_hSsETod3A?key=X1RVS3ZwbVEyc0xwbjhlWkc2cUhDU0NTOTZnMGV3
Luca checked accelerometer and confirmed that it does not work.
Oscillator itself does not break. Stepping motor is also OK.
Circuit might have issues.
We brought out accelerometer from cryostat and transport all items to University of Toyama.
Luca investigates.
Photo:
https://photos.google.com/share/AF1QipPDAF61GxcmKerSAras7Kme7KGVmE7PhoQbUbOiyY4CEO3Rs2KkHr_YWdBseP52ug?hl=ja&key=YXFVV3VtMnBiZXl0amtZVG8td2N6a1BTRUtnbzJB
Strength test of HCB between sapphire blank bulk and sapphire ears at University of Toyama ended.
They survived in three weeks.
Unfortunatly, HCB between one of sapphire spacers for magnets and sapphire bulk
did not work (but it is not fault of HCB itself. We are afraid that this spacer was not
on bulk). Takafumi Ushiba and Kiran Craig measured position of jig for this spacer
and other spacers. They are sure that jig position is appropriate.
They and Kazuhiro packed box which includes sapphire blank bulk and put into Pelican case.
Kazuhiro drove his car (Kieran, Takafumi and HCB box were in his car).
HCB box arrived at clean booth for BS. Kieran and Takafumi put glue between spacer and bulk.
And now we wait until glue is dry.
Takayuki, Suzuki-san, and Rahul picked up parts of sapphire fiber holders at logistic center
(unfortunately, parts were not delivered in morning at University of Toyama). They washed in
ultrasonic bath at University of Toayama and brought.
Apparatus of cryogenic accelerometer were moved because of installation of cross duct above IXC cryostat.
Rome group asked Kazuhiro Yamamoto to check their accelerometer. So, Kimura-san and Kazuhiro move apparatus again
to recover. Now, they look what they were.
https://photos.google.com/share/AF1QipO1cVsAjv8fGmFqSoVjStmyBwLv-TyrrV8sOI_0beL_JQnwZ5A_lGkl8gLQjBOgRQ?hl=ja&key=QURyemNONnlhVkpKY1U1YW9wV21nMGd6c3FGc2pn
Kazuhiro is checking Rome accelerometer. He comes back on Thursday.
Toshiro picked up some parts of accelerometer in shield.
Toshiro and Kazuhiro moved tables and measurement devices which were near clean booth of cryostat.
We opened IXC. Before we opened, we put sheet (no electric charge) in front of port of cryostat.
Kunihiko Hasegawa checked shield and so on for his experiment (contamination of Fabry Perot Cavity in IYC).
Toshiro Ochi picked up some parts of his cryogenic accelerometer.
We also discussed schedule of experiments of Kunihiko and Toshiro.
They test vacuum furnace at University of Toyama. It works. But overshoot of
temperature is an issue. Nevertheless target temperature is 120 degree,
actual one was about 170 degree ! Yoichi called Sato-san (KEK).
Even if we use PID control, it is not so easy if target temperature is low.
Yoichi tries on Thursday (the day after tomorrow) again..
Anyway, if somebody would like to use, s/he must investigate how to control temperature
IN ADVANCE.
Photos are here.
https://photos.google.com/share/AF1QipMY4Z3c1nfEXoaCrAUY0U1yHtdC1KZmxfn0AG22uXp69vejrdUuhkzflRftxlW6Eg?hl=ja&key=THZYb2NCajZ3UHJiYTdjZGM5RkpoN0dMZ3VnU2dn
Bath works.
Photos
https://photos.google.com/share/AF1QipPEyJFrPUSLnJisDTOctqvENt907YIHjUOCneGcgA5VtRSNIRio7Hg153Qwg2Mc7Q?key=Rm12QnB3encwQXc3XzFqVmdsTmx4UUxhSDdEUzFn
Photos are here.
https://photos.google.com/share/AF1QipPOPUHSCuBSe9yNOSY0O_Ky6fUkrQLRS2ONfhAnis1L1E306UhTzqvGgDA9tpSpHQ?key=bGJ6cTByREtvRlRHN3A1cW1VX1ZTWHlJRmM5czNn
Bath works.
Photos
https://photos.google.com/share/AF1QipPEyJFrPUSLnJisDTOctqvENt907YIHjUOCneGcgA5VtRSNIRio7Hg153Qwg2Mc7Q?key=Rm12QnB3encwQXc3XzFqVmdsTmx4UUxhSDdEUzFn
27th of Feb (Mon)
all cryocoolers (four cryocoolers for cryostat and two cryocoolers for cryoduct) started to work
(16:50 JST). We measured vibration before and after start of cooling. We observed cryocooler generates
vibration. Details are being analyzed.
Photo
https://photos.google.com/share/AF1QipPA0p75Ew1F-fx_iPahKElRBCBC77ZChmvsQxCpJReiasF8rD2Fk_0WNQ90zjO2GA?key=bjZkcTUyTjBXYTBOVUstNlBpeDlIb0JqVVA2dEJn
28th of Feb (Tue) - 3rd of March (Fri) : Vibration measurement and adjustment to compensate drift by cooling
4th of Feb (Sat) Kazuhiro adjusted Luca's accelerometer (vertical direction) to compensate drift by cooling.
HCB mission started at University of Toyama !
Kieran and Takafumi prepared in clean room.
Faro was also carried into clean room (Kitazawa-kun (undergraduate student of University of Toyama) and
Kazuhiro (now, he belongs to University of Toyama) supported).
Only problem is detergent. It must be neutralized (otherwise, chemical reaction happens on surface of Aluminum).
Unfortunately, it was not delivered in this week. On Monday of next week, we can wash part, we hope.
In the next three weeks, we repeats HCB practices a few times.
Photo
https://photos.google.com/share/AF1QipObgrlM_fsCYAdAZFenjFNbnqMN4CqYjgsv6UO_XTUe7SReDrqmmql-9jewo6-CKQ?key=ZEhiM2o4YjRmMVhhNzdtT2l6VUJhY20yQi16ZHZB
Kazuhiro checked status of acceleromters in the morning.
All cryocoolers were stopped around 13:00.
Horizontal accelerometer
Error signal around 13:00 is between +7V and -13V.
(Before cooling, it was between +13V and -13V).
Contrast defect increased.
Vertical accelerometer
Output : +3.6V (10:10)
So, direction (sign) for compensation during cooking is NEGATIVE.
Kazuhiro adjusted. At 14:05, output was -30mV.
There are three SR560. Kazuhiro checked and found there is no large difference from point of view of noise.
Both accelerometers
Contribution of cryocooler for cryoduct on BS side is quite large.
When it is turned off, output of both accelerometer is small.
Whichever cryocoolers for main cryostat work or not, outputs of accelerometers
are comparable. Oscilloscope shows 200Hz contribution is large. So it could be
vibration but it might be electric one. We must check.
Kimura-san released screwbas along bellows between cryocooler (for cryo duct)
and cryo duct. But no change happened.
All electric cables are prepared. Around 3pm, all cryocoolers for main cryostat
started to work. Cryocooler for cryo duct on BS side is also in operation.
Kimura-san and Sawada-san found water leak around screws on water pipe for
cryocooler of cryoduct inside Fabry-Perot cavity. So, this cryocooler does not work now.
Tomorrow, status should be checked. Cryocooler for cryoduct inside cavity will be also checked
whether it works. In any case, all cryocooler will be turned off around noon of Friday.
If there is no problem, cooling test starts on Monday of the next week.
Kazuhiro measured shield vibration in lunch time because it is quite.
Around 3 pm, finally, all four cryocoolers for main cryostat and one cryocooler
for cryo duct on BS side started to work !
Kazuhiro measured vibration again. So, there are two kinds of spectra; without and with cryocoolers
operation !
He wrote down status of accelerometers on lab notes. Let see what happens until tomorrow morning.
Around tomorrow noon, all cryocoolers will be turned off. If we have no problems on Monday,
cooling test will start !