H1 SUS HSTS MC2 Acceptance Document

Document #:: LIGO-E1400119-v1
Document type:: E - Engineering documents

Other Versions:

Abstract:

For General Acceptance Documentation common for all HSTS refer to
https://dcc.ligo.org/LIGO-E1201040 aLIGO SUS HSTS Acceptance Documentation.

Calum Torrie signed April 16th 2014. One Punch-list items listed below.

1) Pitch / roll mode coupled to vertical. Recommend add to bug-list and track. Refer to alog 6552.

Punchlist items and their resolution will be tracked in T1400181. They will not be updated on this Acceptance Document filecard.

Files in Document:

RS20808_IMG_1701_v2.jpg (1.9 MB)

Topics:

Authors:

Keywords:: BULK_E1400109 SUS aLIGO HSTS Acceptance

Notes and Changes:

I. Committee (* indicates review chair)
Rich Abbott, Alastair Heptonstall, Calum Torrie*, Jeff Lewis, Fabrice Matichard, Celine Ramet.

II. Documents for Review (against list from M1100282)
Top Assembly Name:
D0901099 AdvLIGO SUS HAM3-H1, XYZ Local CS for HSTS (MC2) Sub-Assy

ICS Assembly #:
- ICS Assembly Load:
https://ics-redux.ligo-la.caltech.edu/JIRA/browse/ASSY-D0901099-NA

Acceptance document:
This filecard serves as the acceptance document for H1-MC2.
For common material for all HSTS suspensions, see
https://dcc.ligo.org/LIGO-E1201040

ICS inventory

S-numbers
The electronics for H1 SUS MC2 can be found in the racks
S1301868
S1301869
S1301887

Test results:
- Calibrated, M1toM1 Transfer Functions (DAMPING OFF):
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=6552
Note from Arnaud : "MC2 has pitch (1Hz) and roll modes (1.5Hz) coupled into the vertical mode."

- Calibrated, M2toM2 Transfer Functions (DAMPING OFF):
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=7272
Note from Arnaud : Top mass vertical mode (~.85Hz) couples into M2/M3 Pitch mode

- Calibrated, M3toM3 Transfer Functions (DAMPING OFF):
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=7272

- Calibrated OSEM Sensor ASDs, All Stages (DAMPING OFF):
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=11121

- B&K Hammer Cage Resonance Transfer Functions:
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=4365

- Coil Driver Noise:
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=4751
- Coil Driver Response in all states:
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=4495

- Violin Mode Frequencies and Q
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=5280
https://dcc.ligo.org/LIGO-T1200418-v3
Measured violin mode Qs are used to estimate wire losses (structural and thermo-elastic) and hence expected thermal noise at lower frequencies. Results for MC2 at LLO (see link) tie up well with our model and provide evidence that double prism technique appears to be doing its job. We confirmed that we are only requiring one example for each type of suspension.

Note added 5th Sept 2014 for clarification (NAR/CIT)
Predicted violin mode frequencies and Qs for all types of suspensions are given in T1300876. These can be compared to measured values.
Measuring Qs is not a requirement for SUS acceptance.
For Installation acceptance it has been agreed that we should measure Qs once for each major suspension type.
For HSTS, we measured violin mode Qs on L1 MC2, see links above.
See also reviewer comments on MC2 acceptance page at E1201042
Note that double prism technique is also used for the HLTS and BS.

Channel/Signal List and Calibrations
For latest measurements of OSEM Sensor's Open Light Current, See
https://dcc.ligo.org/LIGO-E1200343
Otherwise calibrations are assumed to be as shown in HSTS Control Design Description,
https://dcc.ligo.org/LIGO-T1000061
with a roughly 20% uncertainty (determined by the worst discrepancy seen between modeled and measured transfer functions across all DOFs and many HSTSs). The following channels are calibrated into [um] or [urad]:

H1:SUS-MC2_M1_ISIWIT_{L,T,V,R,P,Y}_DQ (Susp Point)
H1:SUS-MC2_M1_DAMP_{L,T,V,R,P,Y}_IN1_DQ (Top Mass)
H1:SUS-MC2_M2_WIT_{L,P,Y}_DQ (Middle Mass)
H1:SUS-MC2_M3_WIT_{L,P,Y}_DQ (Optic)
(For coordinate system definition, see https://dcc.ligo.org/LIGO-E1100109)

III. General notes and action items:

Referenced by:

LIGO Document E1400119-v1

H1 SUS HSTS MC2 Acceptance Document