Transcript telescope mount

M2FS SAC Update—March 18, 2012
System Overview:
M2FS Spectrograph
• Two independent,
identical channels
• Each fed by 128
fibers
• Each with LoRes and
HiRes modes
• Operates from 370950 nm
• Operates at NAS-E
• Take the tour!
M2FS SAC Update—March 18, 2012
System Overview:
M2FS Fibers
• Broadband Polymicro
fibers
• 150 𝜇 cores
• 10.5 ft long
• 256 deployed +
spares
• 1.2 arcsec apertures
• 12 sec c-c min
separation
• Fiber-end Slits
M2FS SAC Update—March 18, 2012
System Overview:
Fiber Mount/WFC
• Mounting similar to
MMFS (many parts
to be re-used)
• New Wide-field
Corrector (WFC)
• Mounts to inner
boss at NAS-E and
usual outer mounting
surface.
M2FS SAC Update—March 18, 2012
System Overview:
Calibration Unit
• Mounts on swing-in
arm at secondary
cage.
• Seven arc lamps +
quartz sources, all
upward-looking.
• Fiber-locator system
projector, downward
looking.
M2FS SAC Update—March 18, 2012
System Comparisons:
M2FS
Property
MMFS
HiRes
LoRes
Channels
2
2
# of Fibers
256
256
𝜆 Range (nm)
370-950
Resolution, ℛ
18-34k
0.2-12k
X- Dispersed?
Yes
No
Blue
FLAMES (VLT)
Red
Hecto (MMT)
UVES
GIRAFFE
Spec
Chelle
2
1
1
1
1
256
8
132
300
240
360-520
500-900
480-900
370-950
370-920
18k
15k
46k
7-24k
1.5-3k
32k
Yes
Yes
No
No
No
1.2”
Fiber Diam.
1.2”
1.4”
1.0”
Min. Fiber Sep.
12”
14”
>30” (Variable)
>30” (Variable)
Field Diam.
30 arcmin
20 arcmin
25 arcmin
60 arcmin
Vlimit: S/N=5, 2
hrs, 500 nm,
med. seeing
21.5
ℛ~20𝑘
24.0
ℛ~1𝑘
20.7
20.5
21.0
22.5
ℛ~7𝑘
1.5”
23.5
ℛ~1.5𝑘
20.5
M2FS SAC Update—March 18, 2012
System status:
• Virtually all of the main spectrograph optics are
fabricated, AR-coated and installed in their cells. The
only exceptions are the cross-dispersion prisms; one of
these is currently being fabricated while the blank for
the second one is still to be received from Schott.
• All remaining spectrograph optics are in hand apart from
the injection mirrors which are in fabrication.
• The grating exchanger, grating mounts (both HiRes and
LoRes) and their associated actuators are completed and
installed.
M2FS SAC Update—March 18, 2012
System status:
• Main optics mounts are completed and installed on the
optical bench.
• Cabling for the optical bench has been installed and
connected to the main electronics box attached to the
instrument cart. The box has been fully wired and
tested.
• M2FS fibers are in their final fabrication step prior to
shipping from UM. They should all be completed by the
end of the first week of April.
M2FS SAC Update—March 18, 2012
System status:
• A prototype for the fiber mounts (at the spectrograph
end) and the associated slit assemblies is being tested.
• Principal electronic components of the Fiber Locator
System (FLS) are in final development at Carnegie and
UM. FLS C-MOS detectors in hand and in testing.
• The fiber junction box and associated hardware is
mostly the same as used in MMFS; this hardware has
been shipped from LCO to Pasadena (take the tour).
M2FS SAC Update—March 18, 2012
System status:
• The new fiber mount and WFC mount is nearing final
design and is planned to be completed by mid-May at
Rettig.
• WFC lenses have all been fabricated and will be ARcoated at ZC&R with delivery date planned for April 13.
• Work on the final design of the calibration sources and
FLS projector (to be mounted at the telescope
secondary cage) has begun. Plan is to fabricate these in
May.
M2FS SAC Update—March 18, 2012
System status:
• M2FS CCDs are in hand. Their installation awaits the
completion of the CCD camera heads (underway) and the
completion of the new CCD control electronics (under
development at Carnegie).
M2FS SAC Update—March 18, 2012
Key Upcoming Tasks (at Carnegie):
• Installation and alignment of the large spectrograph
optics (currently planned for mid-April).
• Installation of the WFC lenses and integration to the
WFC cart (likely in latter half of May).
• End-to-end optical alignment of the M2FS spectrographs
and FIRST SPECTRUM (the Sun!) for May at Carnegie.
• Pre-ship review. Depending on the status of the CCDs
and cross-dispersion prisms, the best windows for this
are the end of June, the end of July or August.
• Packing and shipping of M2FS to LCO (immediately after
pre-ship review).
M2FS SAC Update—March 18, 2012
Key Upcoming Tasks (at LCO):
• Inspection and assembly of M2FS at LCO (>1.5 mos after
shipping from Pasadena; aiming for late Sept-Oct).
• Mechanical fitting tests of WFC and fiber mount and the
M2FS spectrograph at NAS-E (approx 1 mo after
inspection/assembly; aiming for f/5 run in Oct-Nov).
• On-sky testing and commissioning with shared-risk
observations of user-provided fields. New plug plates,
filters, etc. required for normal operations are now being
quoted (aiming to use UM bright time in Dec after AO
run).
M2FS SAC Update—March 18, 2012
Additional Points
• Aim to make M2FS available in 2013A UM support.
• Users have been polled for LoRes grating options. First
pair will be ordered shortly. Additional gratings can be
purchased by interested users.
• Initial filters for order blocking in HiRes mode during
testing are soon to be on order.
• Users have been polled for additional filters to be
available at commissioning and first regular science
operations.
• Updates will be distributed to users every 4-6 weeks
through final assembly and commissioning. Please inform
your communities and ask if individuals want to be added
to our email distribution list.
M2FS SAC Update—March 18, 2012
Future Upgrades
• Echellette for LoRes side (R ~ 10000). Requested as
part of a submitted NSF research grant in Nov 2011.
• Robotic fiber plugging. The hooks for this are being
incorporated into the WFC/Fiber mounts. Details still in
development.
• Trombone-style ADC integrated into the WFC mount.
Hooks for this are included in WFC mount design.
Preliminary design and costing completed.
• IFUs including a potential feed from the AO system.
Still a concept.