J. Oberling, E. Merilh, J. Bartlett

PSL recovery from the power outage is complete.  We had 1 issue when bringing the laser up: the power meter that reads the power output from the PSL appears to have failed.

After turning everything (power supplies, control boxes, etc.) we began by bringing up the chillers; no issue here.  When bringing up the PSL for the first time we noticed all the power appeared to be in the backwards direction, with nothing in the forward the direction.  We killed the laser using the kill button on the table, then ran into the problem of the interlock not resetting.  After much messing around with the interlock button and the control box, we found that you REALLY have to pull the button out to reset the interlock (when it feels like the button is about to break, pull harder).  That taken care of, we turned the laser on and this time opened the external shutter; there was power being measured on the PDs and power meters external to the HPO box (PMC REFL, HPO external PD) so everything with the laser was functioning properly.  Tried power cycling the questionable meter and saw no change.  In the interest of getting the PSL up and running, and as this power meter is not used during normal operation of the PSL (only used when the HPO external shutter is closed), I decided to not swap the power meter.  I did confirm that we do have a spare, but after a quick survey I could not find water fittings for it (it is a water cooled power meter).  We will swap this out at the next opportunity.

All other PSL systems came online without issue.  System is currently on and running, and has been warming up for ~1 hour.  Will continue to monitor.

It occured to me that the hysteresis of the pzt might be something I could overcome by dithering the pzt around the values that were restored when we brought the system up.

I started the dither at +/-5000, then dithered at +/-1000,  then +/-100, then +/-10, then +/-1, with 20 second sleeps between each change.

I dithered both pitch and yaw.

When the beam from the PSL was restored, the IMC REFL beam was completely on the camera, and the IMC locked (though at low value, WFS are off).

This will be a running log of activities as they occur for bringing back CDS after the planned outage over the weekend.  Refer to Richard's alog about what happened over the weekend for prep.  

We started the shift with lights, front gate operation, wifi, etc.

Filiberto, Ed, Rich

Installation is complete for the ITM ESD Driver for ITMX and ITMY.  A short was found on the bias connection to ITMX (see attached sketch to clear up the pin numbering of the legacy connector).  The shield was cut and insulated on the 2ft section of cable up near the vacuum feedthrough for this connection.  All nominally 24V connections were HIPOT tested to 500V, and the high voltage bias connections were tested to 700V.

An ADC (ADC07) was added to SUS-C5-14 to permit the ITM ESD readback channels to be implemented per the latest wiring diagram (D1500464).

At time of writing, no aspects of the installed system have been verified in situ.  This is the next item on the checkout.

Some useful system constants (total for both drivers):
+/- 18VDC Nominal Quiescent Current -> +460mA, -420mA
+/- 24VDC Nominal Quiescent Current -> +40mA, -40mA
+/- 430VDC Nominal Quiescent Current -> +/- 5.6mA

Serial Numbers:
ITMY ESD Driver (D1600092) (installed in SUS-R6) -> S1600266
ITMX ESD Driver (D1600092) (installed in SUS-R5) -> S1600267
ITM PI AI Chassis (D1600077) (installed in SUS-C6 U23) -> S1600245

As noted by Dave B.  We began the orderly shutdown of the site at 1500 local time on Friday.
The power actually went out at 1715 and we were almost ready.
Vacuum system with the generators setup did not go as smoothly as it could.
1. Generator output was too low for the UPS to operate on.  UPS looking for 115V and we were at 112V.  We bypassed the UPS and ran the 24V dc supplies directly from the Generator.
2. The GFI outlet on EY generator would not function so it was replaced
By 1930 we were comfortable leaving the site.

Sat.
0800 Site was dark all buildings, generators, Vacuum system in good shape
1800 New switch at substation installed.

Sun.
0800 Site was dark all buildings, generators, Vacuum system in good shape
1200 Testing of switch complete (hicups included)
1300 Site power restored.
Facility cooling began.
converted Vacuum system to building power generators turned off.
1500 left for day.
Other Vacuum details by Vacuum group.

State of H1: systems are off

Weekend Prep activities:

• 22:01 - Nutsinee, turning CO2 lasers off
• 22:06 - Jason, shutting down PSL, starting with diode room
• 22:10 - guardian in DOWN*
• 22:15 - all SUS now in SAFE
• 22:16 - MC2 going to MISALIGNED instead of SAFE*
• 22:17  - all SEI now in safe
• 22:18 - Jason and Jeff to PSL
• 22:23 - Hugh - HEPI pumps are off
• 22:25 - Travis - PCAL lasers turned off*
• 22:28 - ALS cleared (no special prep)*
• 22:33 - front ends going down
• 22:38 - RichA, Calum - ITMY hardware in LVEA (do not need front ends)

* indicates  there was some small glitche in our procedure