HWSX and HWSY stray light on Hartmann sensors from undumped BS transmission

We found that there was a lot of stray light on HWSX and a little bit on HWSY. Detective work and general snooping found that the beam going through the main HWS BS was hitting the  rear of the BS rather than the dump behind it.

We adjusted the input alignment of the HWS beam as much as we dared, moving it away from the center of the BS closer to the top edge (in the picture shown below). More of the transmitted beam was dumped onto the beam dump behind the BS. This had the effect of reducing the scatter getting back to the Hartmann sensor by a factor of three or so. Unfortunately, should we move the beam too far across the BS surface, the concern is that the return beam from ITMX will be clipped by the beam splitter mount on transmission.

HWSX stray beam before changes to alignment on BS

The color range in this image is about 180 counts.

HWSX image after changes to alignment to BS

The color range here is about 60 counts.

HWSY stray light image

Color range is about 27 counts for HWSY.

 

 

Guide to beams on HWS BS

Input beam on HWS BS

Reflected beam from HWS BS

Beam dump behind HWS BS

Transmitted beam through BS

 

 

 

rate of rise in pressure test on x/y beam tube manifold

[John, Chandra]

Valved out IP5 and IP6 from y & x beam manifolds at 10:37 am local time. With no pumping on these volumes, we will trend the rate of rise in pressure over some time today. This will give some indication of whether we have a leak or if IP6 is going bad.

Morning Operator Summary

TITLE: 05/16 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

Cheryl not able to make it so Nutsinee, Patrick and myself will cover.  Here is a log of the morning from ~7am -10am PDT.
LOG:

• 14:00 PSL Work:  Measuring NPRO, check water circuit, take PSL down (Peter K)
• 14:15:  Sitewide maintenance at EY, MY, & MX (Chris S)
• 14:23 LVEA work (Bubba)
• 14:30 PSL Plumbing work (Jeff B)
• 15:00 Robert in LVEA
• 15:24:  Toilet truck on site
• 15:35 Hartman Table work (Aidan & TJ)
• 15:39 Cintas for mats
• 15:40 End Station Cleaning (Christina/Karen)
• 15:43 CP4 liquid Nitrogen fill (Norco)
• 16:28 CP6 liquid Nitrogen fill (Norco)
• 16:30 Inventory checks (Betsy, Christina)
• 16:43 Leak checking IP6, for starters (Chandra/VAC)

CP4 Dewar fill

CP4's Dewar is being filled today so I lowered the LLCV actuator value to 34% open. The other Dewar being filled is CP6 and will automatically adjust.

I will order LN2 for CP3 & CP7 on Thursday for next week's delivery.

Maintenance Day!

LVEA is Laser HAZARD (transitioned yesterday).

Multiple activities are already started this morning.  

• PSL is down for plumbing work.
• Hartman table work
• Usual maintenance activities (to be summarized later).

SR3 PIT/YAW oscillations. HWSY return beam located. No luck finding HWSX return beam.

We injected oscillations into the SR3 PIT and YAW  and measured the return power getting back to the HWS CCDs as a function of PIT/YAW position. We located the HWSY beam fairly quickly but we're having trouble locating the HWSX return beam right now. 

To be continued tomorrow ...

IMC not locking - not on IMC REFL PD?

[Vaishali, TJ, Jenne]

In order for Team TCS to work on their stuff, we wanted to get DRMI-related optics somewhat aligned.  Vaishali put all of the optics (including end stations) back to where their local sensors (OSEMs, or OpLevs if available) said they were on 7 May 2017.  This gives us good-looking IMC refl flashes, but the mode cleaner isn't locking.  Note that during this work, we have the IMC refl camera, but we're not seeing anything on MC trans camera.  Not sure why. 

I am not seeing peaks that look nice in either of the IMC trans PDs (IM1 trans or MC2 trans), even though the flashes on the refl camera look good.  Also, we're not seeing nice dips in IMC REFL DC when we get flashes.  We've run all of the Down guardian states, so everything should be set up the way we expect.  All of the settings that I can think of look fine.  We tweaked the input PZT and MC1 to get the WFS DC values back to that May 7th time, but I'm still not seeing normal-looking things on MC trans or MC refl PDs. 

I just don't think the IMC refl beam is hitting the REFL PD, or for some other reason we're not getting a valid PDH error signal for the mode cleaner. Never having been on the IOT2L table before, I don't want to start just before having to leave, so we'll come back to this tomorrow during maintenance, or whenever we can.

NB: TJ is leaving the LVEA in laser hazard.

vertex pump down progress

Attached is the pump down curve read from PT-120 on BSC3. We wait until the pressure reaches 1e-7 Torr via turbo before valving in IPs and opening beam tube gate valves. Extrapolating this curve looks like this will happen late next week.

more vacuum leak checking

[John, Gerardo, Chandra]

John wanted to spray some helium for himself, so we spun the x-beam manifold back up and sprayed all BSC7 conflats again, in addition to IP6 isolation GV and GV4 triple flange. He sprayed He at a KF connection at the leak checker and found a e-9 Torr-L/s range leak, which could have been what Kyle and I detected last week while testing GV7.

John noticed the BSC7 annulus ion pump's reading on front display was not clear i.e. the green LED lights were fading into 6 mA + range rather than clear-cut lit vs. non lit. He tapped on the pump and power cycled the controller a few times. It seems to be reading clearly now at 2 mA. We thought if there was an internal o-ring leak and the annulus ion pump wasn't working properly, that annulus space could be the source of pressure rise in x-beam manifold. We connected an aux turbo cart to that pump and accidentally partially vented the annulus space and then pumped it back down. No change in volume pressure though, which leads us to believe that there is no internal o-ring leak. The AIP is pumping on its own again at 2 mA.

We left the x-beam manifold turbo running and valved out for the night. IP6 is valved back in. While IP6 was valved out during leak checking, its power supply read 172 uA. When valved in, it reads 520 mA. IP5 on y-beam manifold reads about 90 uA (valved in), so we still may conclude that the reason for the pressure rise in x-beam manifold when isolated compared to y-beam manifold is due to difference in IP pumping speed. When IP6 is valved out, we expect it to read even better than IP5 valved in. One thing we didn't check is the IP flange above the gate valve. We should leak check that flange while the IP is valved in. We've sprayed it a few times now, but we always keep the IP valved out during leak checking. When IP is reopened we detect some He in -9 range (no surprise), but.....

h1guardian0 reboot

TJ, Patrick, Dave:

at 15:33 PDT we rebooted h1guardian0 after getting sign-off from all subsystems. On restart, TJ noted CA connection errors with the Slow Controls Beckhoff machine h1ecatx1. Some workstations were apparently connecting to this IOC and other were not. Patrick noted that his CDS overview was connecting, but it was showing the last update times of 19:45:34 PDT Sunday 5/14 on all three PLCs, so we think this is when the IOC stopped updating and accepting any new channels.

The reason for the h1guardian0 reboot is two-fold, recoup RAM and lower processing times (load averages had been hitting 50 recently).

restarted h1ecatx1

IOC crashed (see attached screenshot).

FRS 5270 updated.

Ops Day Shift Summary

restarted IOC for weather station at end Y

Lost connection last Friday during Robert's work.

CP3, CP4 Autofill 2017_05_15

Starting CP3 fill. LLCV enabled. LLCV set to manual control. LLCV set to 50% open. Fill completed in 79 seconds. TC B did not register fill. LLCV set back to 21.0% open.
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Fill completed in 191 seconds. TC A did not register fill. LLCV set back to 45.0% open.

h1nds1 daqd restarted, was not serving data

Carlos, Dave:

[11:23 PDT] we restarted the daqd process on h1nds1, it had become unresponsive.

end Y FMCS channels migrated to BACNet IOC

WP 6577

autoBurt.req file and medm screens updated. No change in channel names or addition or removal of channels.