ARIES FUNCTIONS

May 4, 2005

DETECTORS:

tip/tilt/focus array:	science 9-166L#5

Voffset = 3350 = d16	Victl = 2880 = b40

science array:	science 206

Voffset = 3690 = e6a	Victl = 2700 = a8c

OPTICS:

tip/tilt:

both channels are f/4

90 turns/inch = screw pitch = 0.282 mm/rev

quad #2 is illuminated portion: "focus" at lower left; "t/t" at upper right

with uncoated optics, focus channel is brighter than t/t

1.1 km variation in LGS height equals 0.825 mm focus change

at external motor:

5 turns CW(x-axis) moves probe up 270 pixel on PC screen

about 50 pixel/rev

5 turns CW(y-axis) moves probe left

diameter of probe ~6.3 arcsec (180 pixels)

MOTORS & SWITCHES:

all switches are normally closed (i.e., minimal resistance) and open at 'home'

50,800 steps/revolution

1 front ADC:	9 turns per revolution

2 back ADC	"front" means first in the light path

3 front filter:	12 turns per revolution

1 turn per filter

4 back grism:	12 turns per revolution

1 turn per filter

5 Optics:	CCW end

3/4 turn ----->pupil viewing

19 turn ------>f/30 optics

23 turn------>f/15 optics

1.5 turn

CW end (CW + "towards")

6 Science Array:	26 turns end-to-end

1mm per turn

home switch at CW end

14 turns CW from measured f/15 focus to home position

7 x-axisTip/tilt Array:	CW direction is away from LN2 tank

8 y-axis	52 turns end-to-end

To move probe mirror. Facing the slit plane mirror with ARIES's motors to my left, the "prober x-axis" (CW) moves mirror away. The "prober y-axis" (CW) moves mirror to right. Moving x-axis CW translates image up on PC screen. Moving y-axis CW translates image right on PC screen. Need 25 turns from near-limit to the center of fov.

PC SCREEN:

tip/tilt:	Y-axis CW moves up

X-axis CW moves left

array map:	upper right = quadrant #1

upper left = quadrant #2

lower left = quadrant #3

lower right = quadrant #4

with rotator at zero degrees:

+El moves down & +Az moves right

East (sky) is left & North (sky) is down

INTERNAL THERMOMETERS:

DT-470 (curve #10)

#1 = science detector

#2 = Offner

#3 = tip/tilt detector

#4 = ADC

#5 = outer shield

INTERNAL HEATERS:

4x 25 ohm heaters can survive 1 amp current

internal thermostat kicks in around 60 F to stop heating

BOILOFFS: [assume 656 liters of nitrogen gas/liquid]

outer can (22.59 liters) = 8350 cc/min

heat load = 31 watts

hold time = 32 hours

outer surface area = 22,000 sq cm

inner can (13.43 liters) = 8 on glass ball of meter = 114 cm3/min ==> 52 days !!

outer can boiloff = 122

BUTYL O-RINGS for fill tube assemblies:

can survive a max temperature of 225 F

low temp limit = -65 F

WATER BED HEATERS:	450 F max

FILTER/GRISM WHEEL POSITIONS (5/4/2005):

Note that the Aries software should always have the current filter identifications.

[CW motion of external knobs, starting at the top item and working down]

in CW order (staring from detector side) the front filter wheel (#3) contains:

7	1.3 micron (Marcia ORIEL filter)

8	“CO” -- 2.296 micron (bandwidth = 20.5 nm)

9	J-band

10	“Brackett-gamma“ --(2.1702 micron, bandwidth = 0.0212 micron; at 77K?)

11	2.247 micron filter (bandwidth = 21.2 nm; Barr H2)

0	HOME = OPEN

1	“[Fe II] “ -- 1.6433 micron filter (bandwidth = 45.1 nm; warm values?)

useful for Fe II (?)

1/12/05: opened to full aperture

originally: Freed/Close filter; vignetted to smaller opening ~3/8-inch

2	“K continuum” -- 2.260 micron filter (bandwidth = 53.3 nm; Barr continuum)

3	K-band (2.088 micron, bandwidth = 19.8 nm; Barr cont K)

4	blank

5	AO H filter

6	AO Ks filter

[CW motion of external knobs, starting at the top item and working down]

back grism wheel (#4) contains:

Freed gadget (DSI "four imager")

HOME POSITION = open

Empty

Empty

Empty

Empty

Empty

Empty

BLANK

neutral density 1.0 (annular deposition; could leak)

neutral density 2.5

Empty

Hyperterminal Operation with Motors:

log on as "_COM1" and select "direct to COM1"

setup:

"9600 baud"

8 bits

no parity

1 stop bit

"none" for hardware interface

edit properties:

ASCII sending:

echo typed characters

append line feeds

type "#1" and should receive reply of "#9" indicates the next motor in daisy chain

individual position commands are located in:

/DeskTop/MyDocuments/ARIES/MOTOR CONTROL/MACROS

to execute use "send text file"

other important commands:

<motor #>A0.5

<motor #>V0.5

type <1,2,3,4>LD3	ignore limits (aren't any for these)

type <1,2,3,4>GH-0.5	go to home position; turns knob CCW

type 4D50800	sets for turning knob #4 by 1 turn CCW

need 9v battery to power solid-state relay

Science Detector voltages:	saved in file "mmt.cnf" 10/11/03

V_offset	e6a (3690 decimal)

V_biasgate	a8c (2700 decimal)

Quad #1	510	upper left on PC screen

Quad #2	000	upper right on PC screen

Quad #3	4c0	lower right on PC screen

Quad #4	df0	lower left on PC screen

in VD1 mode, "ped" is approximately 1000-2000 counts in all quads

Increase quad DAC's and "ped" decreases in VD1 mode (0.002930 V/ADU)

Increase V_offset and "ped" increases in VD1 mode

IMAGE QUALITY

October 15, 2003:	0.1 sec exposure with B-gamma filter

dial in astigmatism of -20 nm at zero deg & +5 nm at 45 deg

FWHM = 2.5 pixel

SENSITIVITY

K-band 10 sec exposure: 300 counts

H-band 10 sigma detection in 10 sec: 19.6

Kulesa => this H-band performance exceeds NIRI at Gemini by 0.5 mag	in non-AO mode but excellent seeing

ARIES FUNCTIONS

DonMcCarthy

2001-12-31T07:50:00