Differences between revisions 147 and 189 (spanning 42 versions)
⇤ ← Revision 147 as of 2017-05-26 13:29:23 →
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Editor: MarkBarton
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← Revision 189 as of 2017-09-08 20:36:09 → ⇥
Size: 2743
Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
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At Kamioka (Mark, Fabian, Enzo, Hirata-san): At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun):
 * We characterized the remachined LBB blades, chose three and installed them in the LBB blade units in the PI.
 * We removed all sticky labels from the PI and cleaned the affected areas (and as much as possible of the rest of the surface) with ethanol.
 * We rearranged the arc weights on the PI to make space for the magic wand and installed the magic wand.
 * We rearranged the magnets on the SF damper ring to suit three Cu segments (instead of two as in the test hang).
 * We put proper vacuum-compatible tubing around all the stepper motor connections on the top of the PI (replacing cling wrap).
 * We craned out the SF temporarily and retrieved the lost PEEK cable clamp collet from the BF.
 * We closed the BF, craned the SF back in, and hooked the BF/..., this time with the hex cable clamp.
 * We routed cables from the BF via the hex cable clamp to the SF level.
 * We adjusted the BF trim mass for pitch, roll and vertical, and got the IRM hanging symmetrically around the IM.
 * We adjusted all the IRM OSEMs laterally and in/out.
 * We calibrated the SF LVDT and tested the SF FR stepper.
 * We suspended the SF/... section and weighed it but found the old 7-mm maraging rod adapter did not hold it at the center, so we had to lift it with slings and could not accurately trim it for pitch/roll.
 * Therefore we brought forward the craning in of the PI with the SF damper ring hanging from it.
 * We suspended the SF successfully from the PI and unlocked the F0 keystone to check the mass budget. We needed about 1.5 kg extra, which is about right considering the hex cable clamp and cables.
 * However we had to leave out the F0-SF hex cable clamp because of a bad thread on the inside of the cap. Hirata-san will make a new cap by enlarging the 7-mm hole in an old cap to 8 mm.
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 * Inspected LLB in tank - in a good position, but not very clean - apparent water spots and dirt.
 * Found the geophone adapter plates.
 * Retested SF FR stepper - still good.
 * Finally got SF LVDT working:
  * Found a short in the primary coil due to Al foil used for mechanical reinforcement at vacuum feedthrough connection.
  * Did a full calibration and found that linear range was too small (0.75 mm!) and did not cover nominal keystone height.
  * Decreased gain to increase linear range.
  * Adjusted the height of the yoke and secondary coil unit to center the linear region around the nominal keystone height.
  * Implemented velocity damping.
 * Found all parts for the LBB and damper rings.
  * Cu segments and some other parts were very dirty - wiped carefully for now, but should be properly cleaned before final install.
  * Outrigger parts for LBB have M16 thread cut directly into Al but should have had M16 helicoils. This is a galling risk with Ag-coated rod receptacles. Hirata-san organized rework.
  * Some special lock nuts are in short supply and are being borrowed from supply at ATC for next batch of BFs.
 * Made remaining two geophone in-air descrambler cables (total three).
 * Installed a thermometer supplied by Kokeyama-san on the tower around the BS tank.
 * Prepared the SF damper.
  * Designed a pattern of magnets for the two-segment arrangement of SF damper and laid it out on the magnet ring with the template.
  * Moved the Cu segments on SF cap by 30° (the cap had not been in the right position earlier).
 * Reinstalled PI:
  * Raised the PI with the crane and hooked the SF damper ring. Some of the rods did not fit the receptacles due to tolerance issue, but by going through a large number of rods and receptacles, we found three working sets.
  * Craned the PI onto the frame and suspended the SF/... section, this time with the hex cable clamp on the F0-SF rod.
  * Tensioned the PI yaw return spring, installed (but did not cable) the yaw stepper and adjusted the yaw of the SF/... section. We worry the return spring is not stiff enough.
  * Installed (but did not cable) the geophones.
  * Recentered the IP. The extra weight from the geophones (≈42 kg) and SF damper ring (≈17 kg) had brought the IP to near the point of instability, so we removed one arc weight (≈17 kg) and rearranged the other two in the top row to be symmetrical.
  * Added ballast to set the height of the F0 keystone. We now have about 6 kg in hand (due to removing one of the Cu segments for the SF damper). This should be enough margin for cables, temperature fluctuations etc.		 ==== Plan for week of 9/13 ====
Mark (except Wed), Fabian (except Mon, Tue), Enzo, Ohishi-san (except Mon-Wed), Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun
 * Reinstall F0-SF rod, this time with hex cable clamp.
 * Route cables.
 * Adjust SF trim mass, adjust tilt and vertical.
 * Adjust SF damper gap.
 * Cable and test IP LVDTs.
 * Cable and test F0 LVDT.
 * Cable and test PI steppers.
 * Cable and test geophones.
 *
==== Plan for week of 9/19 ====
No work Mon 9/18 (敬老の日)<BR>
Mark, Fabian, Enzo, Ohishi-san, Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun
 * Install LBB damper rings.
 * Install suspension.
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==== Plan for coming weeks ====
For more detail, see [[KAGRA/Subgroups/VIS/TypeB/ToDo]].

Week of 5/29, 6/6:
 * Cabling:
  * Route BF/... cabling up past SF to PI.
  * Route SF cabling up to PI.
  * Add Type 3 extensions to SF/... cables.
  * Move vacuum flanges to positions on assembly frame more convenient for next stage (accessible from second floor, one on each corner of frame).
  * Move in-air cabling to match flange positions.
  * Cable and test PI vertical LVDT.
  * Calibrate PI vertical LVDT.
  * Set yoke on PI vertical LVDT (if necessary).
  * Cable and test PI yaw stepper.
  * Cable and test PI vertical stepper.
  * Cable and test PI horizontal steppers.
  * Cable and test PI horizontal LVDTs.
  * Calibrate PI horizontal LVDTs.
 * Crane into tank.		 ==== Vacation Info ====
Mark: 10/16-24

Scraps of text for incorporation in the VIS Meeting Minutes

KAGRA/Subgroups/VIS/MeetingNAOJ

Type B (Mark)

Past week report

At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun):

  • We characterized the remachined LBB blades, chose three and installed them in the LBB blade units in the PI.
  • We removed all sticky labels from the PI and cleaned the affected areas (and as much as possible of the rest of the surface) with ethanol.
  • We rearranged the arc weights on the PI to make space for the magic wand and installed the magic wand.
  • We rearranged the magnets on the SF damper ring to suit three Cu segments (instead of two as in the test hang).
  • We put proper vacuum-compatible tubing around all the stepper motor connections on the top of the PI (replacing cling wrap).
  • We craned out the SF temporarily and retrieved the lost PEEK cable clamp collet from the BF.
  • We closed the BF, craned the SF back in, and hooked the BF/..., this time with the hex cable clamp.
  • We routed cables from the BF via the hex cable clamp to the SF level.
  • We adjusted the BF trim mass for pitch, roll and vertical, and got the IRM hanging symmetrically around the IM.
  • We adjusted all the IRM OSEMs laterally and in/out.
  • We calibrated the SF LVDT and tested the SF FR stepper.
  • We suspended the SF/... section and weighed it but found the old 7-mm maraging rod adapter did not hold it at the center, so we had to lift it with slings and could not accurately trim it for pitch/roll.
  • Therefore we brought forward the craning in of the PI with the SF damper ring hanging from it.
  • We suspended the SF successfully from the PI and unlocked the F0 keystone to check the mass budget. We needed about 1.5 kg extra, which is about right considering the hex cable clamp and cables.
  • However we had to leave out the F0-SF hex cable clamp because of a bad thread on the inside of the cap. Hirata-san will make a new cap by enlarging the 7-mm hole in an old cap to 8 mm.

Plan for week of 9/13

Mark (except Wed), Fabian (except Mon, Tue), Enzo, Ohishi-san (except Mon-Wed), Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun

  • Reinstall F0-SF rod, this time with hex cable clamp.
  • Route cables.
  • Adjust SF trim mass, adjust tilt and vertical.
  • Adjust SF damper gap.
  • Cable and test IP LVDTs.
  • Cable and test F0 LVDT.
  • Cable and test PI steppers.
  • Cable and test geophones.

Plan for week of 9/19

No work Mon 9/18 (敬老の日)<BR> Mark, Fabian, Enzo, Ohishi-san, Hirata-san, Yoshioka-kun (Tue, Wed, Fri), Kozu-kun

  • Install LBB damper rings.
  • Install suspension.

Vacation Info

Mark: 10/16-24

KAGRA/Subgroups/VIS/TypeB/Minutes (last edited 2022-10-28 10:02:46 by fabian.arellano)