Subject: Re: [sloan-25mlog 3644] 2.5m obslog 20170909 (SJD 58006)
From: Kaike Pan
Date: Sun, 10 Sep 2017 12:25:56 -0600
Hello All,
Looks like the problem on cart 7 is that we are hitting movable range of =
M2.=20
When I come in today, I saw the M1 is stuck near its home position, =
galil at -723K (home position is -725K),
The desired M2 piston position is -5744 um, could not reach there. I am =
able to move M2 back to the center
position, and homed it, and set it back to its default focus position =
with focus set to 0, absolute position at -2375
for alt=3D30 deg.
Plate 9157 is drilled for Tem=3D1 C and HA=3D-30 deg while the actually =
temperature is about 15C. The difference=20
between drilled temperature and real time temperature requires a scale =
of 1.00045, which requires M1 move from
the sky by -4500 um. This scale change requires M2 to move away from the =
sky by -4500 um too. Because of the=20
real M2 position (relative to M1) is at 1800 um , this means the final =
position of M2 needs to be at (-4500 um -1800 um)
=3D-6300 um, which is out of its moveable range.=20
For the long term, I think that we need to put M2 back where it was.=20
For the short term, I need to select plates with drilled temperature not =
colder more than 8 degrees or so. All
MaNGA plates and eBOSS plates are drilled for temp =3D 5C.  Depends on =
altitude, HA etc, we may, may not be able to=20
set scale and focus properly on these plates.=20
Nathan, for tonight, we checked that there are two plugged plates: plate =
9517 and 9519 on cart 9 and cart 7,
are drilled for Temp=3D1.0. I think that we will run into the same =
problem as last night. I understand that pluggers
has completed to plug all requested plates for tonight. But you may want =
to ask JohnD whether it is possible to
ask pluggers to plug two more plates. Fortunately, both of these plates =
are scheduled for the 2nd half of the night.
So it will be fine if you can get replacements plugged by the middle =
night.=20
John, I talked to Muwen who is ok to plug two more plates after she =
comes back from Alamogordo this evening.
Thanks,
-kaike
> On Sep 10, 2017, at 6:40 AM, kgrabowski@apo.nmsu.edu wrote:
>=20
>=20
>                       APACHE POINT OBSERVATORY SDSS 2.5M
>=20
>                                 OBSERVING LOG
>                          Saturday September 09, 2017
>=20
>                                  (SJD 58006)
>=20
> ----  Observing Team ----
>=20
> Karen Kinemuchi
> Katie Grabowski
>=20
> Conor Sayers (online)
> Kaike Pan (online)
>=20
> ---- Observing Plan ----
>=20
> Sat  9 SEP 2017    58006.0   0.86    02:26  12:10    18:41  04:25     =
----  =20
> MaNGA until 03:45 ( 1.3 h), then APOGEE-2 ( 8.4 h)=20
>=20
> ---- Observing Summary ----
>=20
> Lost 1.3 hours for MaNGA and 5.2 hours for APOGEE due to weather.=20
>=20
> Lost 0.9h of APOGEE for a hardware or software issue on Cart.7 trying =
to focus
> and make scale changes.=20
>=20
> Focus Sweep on Cart.12
> Cloudy night tasks:
> Biases: 248653-77
>=20
>=20
> APOGEE-led:
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Cart.1, plate 9289, field 120-08-RV, GSOGTF, 4x(AB+C), not done
> Missing fibers: [121, 122-150, 277]
> Faint fibers:   [227]
>=20
>=20
> APOGEE-only:
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Cart.9, plate 9290, field 150-08-RV, no guide stars, offset RA+10, =
4xAB, not done
> Missing fibers: [36, 121-150, 277]
> Faint fibers:   [284]
>=20
> Cart.7, plate 9157, field 180-08-RV, no guide stars, offset RA+20, not =
done
> Missing fibers: [121-150, 277]
> Faint fibers:   [202]
> NOTES TO DAY STAFF AND DEVELOPERS:
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> * We were unable to focus guide stars on Cart.7 again tonight. The =
secondary
> focus stopped moving after we tried to change the scale. This was the =
last plate
> of the night, same as last night, and we were unable to solve it =
before twilight.