- Preparing for the cartridge install at BSC6, led by Hugh R.
	- Suspensions Locking down
	- TMS being covered by a sock
	- EE guys modifying field connectors
	- Overall meeting to determine readiness
- Cartridge Landed
- PSL Table arriving today from Pacific Cascade Trucking.
- Carbon optical lever giraffe arrived from Aeroshear. 
- Sno Valley came to work on chillers (Ski)
- NorthCoast here for Ken
- DAQ cabling and hardware being rechecked at BSC8 by CDS and reboot of SEI and SUS

This report is for 02 April. The doors were removed and the support cleanrooms were moved into place. The support table was extracted and preserved clean. The viton rim was installed on one dust barrier and started on another. 

Dave, Jim and Rolf
We tested the inclusion of the DACKILL part in the user model. We created two test user models which we ran in place of h2hpiitmy and h2isiitmy on h2seib8. The models drove adjacent DAC channels. These channels were routed to unused ADC channels on h2susb478.
Initial tests showed problems which Rolf quickly fixed in trunk/ branch 2.5
we have left h2seib8 running the test models in preparation for running the new ISI model tomorrow.

Apollo Crew-Bubba Randy Mick Mark Scott LIGO-Jodi Jim Betsy Mitchell Travis JeremyB  Film Crew--Dale!

No real issues to report.  A little longer than we expected on the Cleanroom lift process and we had some resistance when pulling the last Alignment Pin.  But it is in place, torqued down and the Chamber is secure.

Thanks to all for their great patience and attention to detail.

Unusual HF resonances/noise were observed on the transfer functions recently measured on HAM-ISI Unit #4.

Multiple configurations were tested:

1. Initial Configuration: Top Mass Sitting on 3x thin Washers, one of them was mistakenly set on an optical table track (we found the washer bent) - Balancing Masses (5kg and 10kg) stacked on thin washers too.
2. Top Mass Sitting on 3 Thicker washers instead of the thin ones. Same configuration (thicker washers) for the 5kg and 10kg balancing Masses.                        -> The unusual 126Hz and 160Hz resonances are pushed towards ~195Hz, where we saw them on the previous Units. 
3. A bolt, and its washer, that were sitting in a vertical hole of corner #3 GS13's door were removed                                                                                                -> No Noticeable Effect
4. A cable, which was possibly rubbing, was set in another position                                                                                                                                                    -> No Noticable Effect
5. The washers set under the balancing masses were removed                                                                                                                                                         -> This considerably reduced the unwanted HF resonances/noise

A presentation for the results of each step is attached.

Transfer function measurements are running overnight on the ISI in its latest configuraton.

Routed field cables to BSC6 chamber next to appropriate feed-thru. SEI cables were connected to feedthru (ISI Coil Driver, Trillium T240, GS-13s, and L4C). SUS cables routed to chamber but not connected to feedthru.

Today, the sea container holding the H1 PSL laser (now intended for LIGO India) arrived and was unloaded at the Y-mid station (thank you RodneyH, Mark(Apollo) and MarkL).

There are four large wooden crates (one smaller than the other three) that are now stored in the VEA (see attached photo).

Our German colleagues are expected to arrive on April 23 to begin the process of moving the H2 PSL to the H1 Laser Area Enclosure.
At that time, they may open some of the crates to retrieve needed components.

They are checking on the ability to stack the crates, so we will hopefully be able to compact the load for long-term storage.

Please contact me or Michael Rodruck if the boxes need to be moved.

All five FE cores crashed at 11 mins past midnight Sun 1st April, this is not an april fools joke.

here is the dmesg capture before we reboot the machine.


[1426964.148086] h2pslfss: ADC TIMEOUT 1 31229 61 31293
[1426964.148088] h2psliss: ADC TIMEOUT 0 31229 61 31293
[1426964.148090] h2pslpmc: ADC TIMEOUT 2 31229 61 31293
[1426964.148092] h2psldbb: ADC TIMEOUT 3 31229 61 31293
[1426965.146334] h2ioppsl0: timeout 0 1000000 
[1426965.146339] BUG: unable to handle kernel NULL pointer dereference at (null)
[1426965.146341] IP: [] fe_start+0xe32/0x214e [h2ioppsl0]
[1426965.146349] PGD 0 
[1426965.146350] Oops: 0000 [#1] SMP 
[1426965.146351] last sysfs file: /sys/devices/pci0000:00/0000:00:1e.0/0000:2b:01.0/class
[1426965.146353] CPU 1 
[1426965.146353] Modules linked in: h2psldbb h2pslpmc h2pslfss h2psliss h2ioppsl0 open_mx mbuf
[1426965.146356] 
[1426965.146358] Pid: 0, comm: swapper Not tainted 2.6.34.1 #6 X8DTU/X8DTU
[1426965.146359] RIP: 0010:[]  [] fe_start+0xe32/0x214e [h2ioppsl0]
[1426965.146364] RSP: 0018:ffff8801beca7698  EFLAGS: 00010092
[1426965.146365] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000011e
[1426965.146366] RDX: 0000000000023c56 RSI: ffffffff81789ffd RDI: ffffffffa00311f2
[1426965.146367] RBP: ffff8801beca7ee8 R08: 000000007ffffff0 R09: 000000000000000a
[1426965.146368] R10: 0000000000000006 R11: 00000000ffffffff R12: 0000000000000000
[1426965.146370] R13: 0000000000000000 R14: ffffc900118d6000 R15: 0000000000000040
[1426965.146371] FS:  0000000000000000(0000) GS:ffff880001e20000(0000) knlGS:0000000000000000
[1426965.146372] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[1426965.146373] CR2: 0000000000000000 CR3: 0000000001a09000 CR4: 00000000000006e0
[1426965.146375] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[1426965.146376] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[1426965.146377] Process swapper (pid: 0, threadinfo ffff8801beca6000, task ffff8801bec7aac0)
[1426965.146378] Stack:
[1426965.146379]  0000271700002711 0000271700000006 000000010000290b 0000000200000003
[1426965.146380] <0> 0000003500000003 ffffc900118d7034 ffffffffa0033a80 0000000000000000
[1426965.146382] <0> 0000000000000000 ffffc900118bc000 0000000400000000 00000000000007f8
[1426965.146384] Call Trace:
[1426965.146390]  [] ? cpumask_next_and+0x2c/0x39
[1426965.146394]  [] ? cpumask_weight+0xc/0xe
[1426965.146396]  [] ? find_busiest_group+0x36f/0x784
[1426965.146400]  [] ? timekeeping_get_ns+0x16/0x38
[1426965.146402]  [] ? apic_write+0x11/0x13
[1426965.146404]  [] ? lapic_next_event+0x10/0x14
[1426965.146406]  [] ? clockevents_program_event+0x75/0x7e
[1426965.146408]  [] ? tick_dev_program_event+0x37/0xf7
[1426965.146411]  [] ? enqueue_hrtimer+0x65/0x72
[1426965.146413]  [] play_dead_common+0x6e/0x70
[1426965.146415]  [] native_play_dead+0x9/0x20
[1426965.146417]  [] cpu_idle+0x46/0x8d
[1426965.146422]  [] start_secondary+0x192/0x196
[1426965.146423] Code: 00 8b 42 24 83 c8 01 89 42 24 8b 95 44 f8 ff ff 31 c0 8b b5 8c f8 ff ff e8 2a 13 00 00 48 8b 05 8f a7 00 00 48 c7 c7 f2 11 03 a0 <8b> 30 31 c0 e8 13 13 00 00 48 8b 05 78 a7 00 00 8b 00 66 85 c0 
[1426965.146433] RIP  [] fe_start+0xe32/0x214e [h2ioppsl0]
[1426965.146437]  RSP 
[1426965.146437] CR2: 0000000000000000
[1426965.146756] ---[ end trace d3abcc5123271f5d ]---
[1426965.146757] Kernel panic - not syncing: Attempted to kill the idle task!
[1426965.146758] Pid: 0, comm: swapper Tainted: G      D    2.6.34.1 #6
[1426965.146759] Call Trace:
[1426965.146761]  [] panic+0x73/0xe8
[1426965.146764]  [] do_exit+0x6d/0x712
[1426965.146765]  [] ? spin_unlock_irqrestore+0x9/0xb
[1426965.146767]  [] ? kmsg_dump+0x115/0x12f
[1426965.146769]  [] oops_end+0xb1/0xb9
[1426965.146772]  [] no_context+0x1f7/0x206
[1426965.146774]  [] __bad_area_nosemaphore+0x179/0x19c
[1426965.146776]  [] bad_area_nosemaphore+0xe/0x10
[1426965.146778]  [] do_page_fault+0xff/0x210
[1426965.146780]  [] page_fault+0x1f/0x30
[1426965.146784]  [] ? fe_start+0xe32/0x214e [h2ioppsl0]
[1426965.146788]  [] ? fe_start+0xe24/0x214e [h2ioppsl0]
[1426965.146791]  [] ? cpumask_next_and+0x2c/0x39
[1426965.146793]  [] ? cpumask_weight+0xc/0xe
[1426965.146795]  [] ? find_busiest_group+0x36f/0x784
[1426965.146797]  [] ? timekeeping_get_ns+0x16/0x38
[1426965.146799]  [] ? apic_write+0x11/0x13
[1426965.146800]  [] ? lapic_next_event+0x10/0x14
[1426965.146802]  [] ? clockevents_program_event+0x75/0x7e
[1426965.146804]  [] ? tick_dev_program_event+0x37/0xf7
[1426965.146806]  [] ? enqueue_hrtimer+0x65/0x72
[1426965.146808]  [] play_dead_common+0x6e/0x70
[1426965.146810]  [] native_play_dead+0x9/0x20
[1426965.146811]  [] cpu_idle+0x46/0x8d
[1426965.146813]  [] start_secondary+0x192/0x196
controls@h2psl0 ~ 0$ 

Attached are plots of dust counts > .5 microns.

We locked up TMS. The transport restraint chains/turnbuckles look wimpy, but  when you push TMS, it won't budge at all. It feels totally solid.

Some of the eyebolts were too big for the hook to fit (see the third picture) and we needed to use the screw part of the eyebolt.

One real snag was that we couldn't use the new ISC table protection plates as they  interfered with transport restraint structure. So the table is still protected by foils (first and second picture).

Once Doug IAS/TMS finished what they could with the LASER Fiber etc, SEI headed in to lock down the ISI and remove the Keel Mass.  We pulled cable from the Feedthrus back to the ISI on the West end to give access to pull the Mass down.  TMS was anxious to get back in to lock down so we'll complete cable securing Monday and continue Cartridge Install steps.

Once TMS is secure, SUS is on tap for lock down and vibration absorbers.

EE has pulled cables and is working their way to the chamber.  FClara wants all day Monday to get the cable to the Feedthrus so Cartridge flight may need to wait for that.

Two weeks ago, we searched for ground loops on BSC6. We found some but we will really chase them after the cartridge installation due to the limited accessibility of the ISI on its stand at EY.

The ISI cabling drawing is D0901301.

At the feedthroughs, we realized that the pin 13 of the 25pin connectors were grounded (except T240 2 and 3 - Need to be rechecked). It seems the grounding is realized by the pods (see LLO alog 2822) We have to wait the cartridge installation to do measurements on our pods.
At the interface chassis, only the pin13 of the L4C 2-3 cables are grounded.

We opened 4 connetors on both ends of 2 in-air cables (L4C 1 and 3)

L4C - 1 cable (grounded at one end (by the pod)):
At the feedthrough connector: the back-shell is not connected to the shield and pin 13 is disconnected.
At the interface chassis connector: the back-shell is connected to the shield and pin 13 is disconnected

L4C - 3 cable (grounded on both ends - pods and chassis)
At the feedthrough connector: The back-shell is not connected to the shield and pin 13 is connected to the shield
At the interface chassis: The back-shell is not connected to the shield and pin 13 is connected to the shield.

The in-air cables are not identical (CPS in air cables used for the geophones? That's would explain why gender changers were installed).
If the shields are grounded at the pod:
- At the interface chassis, pin 13 should not be connected and the back-shell should not be connected to the shield
- At the feedthroughs, the shield should be connected to the pin 13 and the back-shell shouldn't be connected to the shield

We projected the 808nm beam from the IR collimator with the latest adjustment to the collimator optics, but were not successful in propagating the beam through to the detectors. The beam expands out too quickly from the secondary telescope mirror. We need to more closely mimic the IFO beam waist size and divergence. I believe this will require a custom beam expander with an adjustable focus. The laser wavelength and power seem to be adequate. We got close, but no cigar.

I left the ETM lightly on its bottom stops only with First Contact in place and metal covers on.

The following activities took place yesterday in preparation for cartridge install:
-BSC flooring hardware was installed
-Hand rails were removed from the work platforms
-Chamber cleanroom was lowered
-A manlift was craned across the beamtube for Dale's use
-Upper level garbing/staging cleanroom was moved into place

Removal of viewports and feedthroughs at HAMs1 and 2 continue. Dust barriers and tooling are finished in CNB. We plan on door removal Monday morning.

Vincent ran his ISI transfer functions last night on the ETMY system, attached trends show that the SUS OSEMS were never close to their trip points.

I have finalized the IOP SUS watchdogs MEDM screens, and created a first draft of it alarm handler (images are attached). Also, the WD status is shown on the site overview screen.

Yesterday, the second metal wire prism was glued to the ITMy.  It has been curing under room temperature since mid morning yesterday.  A heat lamp should go on it today.  We won't load the optic into the suspension until next week, as Margot is coming to help clean up the surfaces of the masses Mon-Tue.

The attached pdf contains plots of the accelerometer response from B&K impact hammer tests.  There were six locations on the ETMY sleeve structure selected for impacts.  Each plot displays the response in each degree of freedom (X,Y,Z) of the accelerometer.  The orientation of the accelerometer was such that the X direction is vertically up the structure, and the Y,Z directions in the horizontal plane of the optic.  Each measurement has five averages with 0.5Hz resolution.  

Data:
'~/sus/trunk/QUAD/H2/ETMY/Common/VA_Testing/2012_03_26_h2etmy_hammer_test/'

Plots: 
'~/2012_03_26_h2etmy_hammer_test/plots/'

Today, we resumed testing on ISI-BSC6. After turning the coil drivers back on, we performed basic tests to quickly check the health of the ISI. (SUS-ISI watchdogs interactions, drive all actuators during few seconds, take spectra of all sensors).

Note: When we manually (gently) pushed the table to replug a cable, both ISI and SUS watchdogs immediately tripped but the CDS master watchdog didn't. However, indicators showed that it was closed from tripping. The CDS watchdogs thresholds seem appropriate.

Few tests were performed in the afternoon:

- Offset CPS table unlocked
- Static test in the local basis
- Spectra of all sensors
- Range of motion
- Linearity Test (SUS watchdogs tripped, why?)
- Check the pressure sensors
- Complete the transfer functions measurements (the 700mHz - 10Hz section). Other sections were measured on February 30.

It looks good. See attachment and links below.

Offsets CPS:
https://svn.ligo.caltech.edu/svn/seismic/BSC-ISI/H2/ETMY/Data/Static_Tests/
LHO_ISI_BSC6_CPS_Read_Back_ISI_Unlocked_2012_03_29_113603.mat

Range of motion:
https://svn.ligo.caltech.edu/svn/seismic/BSC-ISI/H2/ETMY/Data/Static_Tests/
LHO_ISI_BSC6_Range_Of_Motion_20120329.mat

Pressure sensors:
https://svn.ligo.caltech.edu/svn/seismic/BSC-ISI/H2/ETMY/Data/Static_Tests/
LHO_ISI_BSC6_Pressure_Sensors_Check_Calibrated_2012_03_29_115020.mat

Spectra:
https://svn.ligo.caltech.edu/svn/seismic/BSC-ISI/H2/ETMY/Data/Figures/Spectra/Undamped/
LHO_ISI_BSC6_ASD_m_LOC_CPS_T240_L4C_GS13_2012_03_29_113004.fig

Transfer functions can be found at:
https://svn.ligo.caltech.edu/svn/seismic/BSC-ISI/H2/ETMY/Data/Figures/Transfer_Functions/Measurements/Undamped/

• LHO_ISI_BSC6_TF_L2L_Raw_from_ST1_ACT_to_ST1_CPS_2012_03_29.fig
• LHO_ISI_BSC6_TF_L2L_Raw_from_ST1_ACT_to_ST1_L4C_2012_03_29.fig
• LHO_ISI_BSC6_TF_L2L_Raw_from_ST1_ACT_to_ST1_T240_2012_03_29.fig
• LHO_ISI_BSC6_TF_L2L_Raw_from_ST2_ACT_to_ST2_CPS_2012_03_29.fig
• LHO_ISI_BSC6_TF_L2L_Raw_from_ST2_ACT_to_ST2_GS13_2012_03_29.fig

Comparisons with transfer functions measured in the staging building can be found at:
https://svn.ligo.caltech.edu/svn/seismic/BSC-ISI/H2/ETMY/Data/Figures/Transfer_Functions/Comparisons/L2L/

• LHO_ISI_BSC6_Comparison_TF_L2L_ST1_ACT_H_to_ST1_CPS_H_20111025_vs_20120329.fig
• LHO_ISI_BSC6_Comparison_TF_L2L_ST1_ACT_H_to_ST1_L4C_H_20111025_vs_20120329.fig
• LHO_ISI_BSC6_Comparison_TF_L2L_ST1_ACT_V_to_ST1_CPS_V_20111025_vs_20120329.fig
• LHO_ISI_BSC6_Comparison_TF_L2L_ST1_ACT_V_to_ST1_L4C_V_20111025_vs_20120329.fig
• LHO_ISI_BSC6_Comparison_TF_L2L_ST2_ACT_H_to_ST2_CPS_H_20111025_vs_20120329.fig
• LHO_ISI_BSC6_Comparison_TF_L2L_ST2_ACT_H_to_ST2_GS13_H_20111025_vs_20120329.fig
• LHO_ISI_BSC6_Comparison_TF_L2L_ST2_ACT_V_to_ST2_CPS_V_20111025_vs_20120329.fig
• LHO_ISI_BSC6_Comparison_TF_L2L_ST2_ACT_V_to_ST2_GS13_V_20111025_vs_20120329.fi

Main differences are:

- The DC gains (cables resistance)
- Resonances of the rigid body modes [1; 10]Hz (different payload)
- ST1-CPS resonances different in the staging building and EY (Teststand short legs vs long legs). Resonance at 53Hz on ST1 CPS V1.
- Resonance at 78.5Hz on stage 2 sensors (Payload)
- Similar at high frequencies