Spares / Limited Life / Consumables List

VERY DIFFICULT

Instrument will be off-line while this replacement happens.

MEDIUM DIFFICULTY

Some care required, or extended time required for replacement

EASY

Component easily accessible with minimal time required for replacement. Partial or no instrument down-time required for change.

OPTICAL REALIGNMENT

Note indicating an optical realignment or verification is required after the component is replaced.

FIU

ADC prism rotators

Micronix PR-50-C0017

2x

$5500 ea / 10-12 weeks

VERY DIFFICULTOPTICAL REALIGNMENT

Requires:

• removing FIU from AO Bench,

• opening FIU,

• removing rotator(s) from FIU,

• removing prism cell from rotator.

None

FIU

H&K fiber stage

Micronix PPX-32CR-C0002

1x

$4500 ea / 10-12 weeks

VERY DIFFICULTOPTICAL REALIGNMENT

Requires:

• removing FIU from AO Bench,

• opening FIU,

• removing Ca HK fibers from stage,

• removing stage from FIU.

None

FIU

Calibration Fold Mirror Stage

Micronix PPS-20-C0035

1x

$4400 ea / 10-12 weeks

VERY DIFFICULT
OPTICAL REALIGNMENT

Requires:

• removing FIU from AO Bench,

• opening FIU,

• removing stage from FIU

• ensuring mirror is located properly after new stage is installed.

None

Cal Unit

Octagon Stepper Motor

Thorlabs NR360S

1x

VERY DIFFICULT
OPTICAL REALIGNMENT

The rotation stage is accessible on the outside of the Calibration Bench, and mechanically this is a straightforward change. The difficulty lies in re-aligning the fold mirror mounted on the rotation stage, so that is directs the light from all sources onto the various fibers.

None

Cal Unit

ThAr Lamp

Green Scientific G858A

2x

(1x Daily,
1x 'Gold')

EASY

The lamps are easily accessible on the exterior of the Calibration Unit.

1 spare

Cal Unit

UNe Lamp

Photron P863

2x

(1x Daily,
1x 'Gold')

EASY

The lamps are easily accessible on the exterior of the Calibration Unit.

4 spares

Cal Unit

HCL Power Supply

Photron P209 Hollow Cathode Lamp Power Supply

4x

EASY

The HCL power supplies are easily accessible within the Calibration Rack.

1x Green Scientific Power Supply

Cal Unit

BroadBand Source 

Thorlabs SLS201L

2x

(1x Octagon, 1x Flat Field)

EASY

The broadband sources are easily accessible under the Calibration Bench.

None

Cal Unit

Intensity Monitor Stage

Newmark MSL-50-21

1x

MEDIUM DIFFICULTY

Mechanically the stage is easy to remove, and the intensity monitor detector is simply mounted (on a post with no careful alignment requirements). Marked as medium difficulty given the care required to avoid damaging the bare optical fibers within the Calibration Unit enclosure.

None

Cal Unit

Filter Wheel

Thorlabs FW102C

3x

(1x Octagon, 1x Flat Field)

MEDIUM DIFFICULTY

Mechanically the filter wheels are easy to remove with no careful alignment requirements. Marked as medium difficulty given the care required to avoid damaging the bare optical fibers within the Calibration Unit enclosure.

None

Cal Unit

Compensator Motor

Newport TRA12PPD

4x
(2x BS,
2x Fold)

Need TBD

Cal Unit

Shutters

Uniblitz DSS25B

6x

(2x Cal Bench,
1x Flat Field, 2x SoCal,
1x HK)

MEDIUM DIFFICULTY

The various shutters are designed to be easily removable from their mounts. Marked as medium difficulty given time required to open the enclosure to access shutter, and care required while working around exposed optics and fibers.

3 spares

Cal Unit 

Etalon Super Continuum

NKT SuperK EVO

1x

$33.5k for new device, $8.5k to refurbish existing device. Lead 4-6 weeks.

EASY

The SuperK is easily accessible within Etalon Rack.

None

LFC

PCF Fiber

Fiber System

Scrambler Timed Shutter

Uniblitz NS65B

1x

MEDIUM DIFFICULTY

This shutter is designed to be easily removable from the scrambler. Marked as medium difficulty given time required to open the enclosure to access the shutter, and care required while working around exposed optics and fibers.

1 spare

MAJOR IMPACT

• Exposures cannot be taken with the main spectrometer until shutter is replaced.

Fiber System

Scrambler Source Select Shutter

Uniblitz RS20B

2x

MEDIUM DIFFICULTY

These shutters are designed to be easily removable from the scrambler. Marked as medium difficulty given time required to open the enclosure to access the shutters, and care required while working around exposed optics and fibers.

10 spares

MEDIUM IMPACT

• If one of these shutters fails in a closed state, that light path (Science or Sky) cannot be used until the shutter is replaced.

Fiber System

Agitator Motor

Galil BLM-N23-50-1000-B

1x

MEDIUM DIFFICULTY

Motor is accessible on the outside of the agitator. A flex coupling is used between the motor and the agitator mechanism, so no careful alignment required. Marked as medium difficulty given the agitator is located within the crypt (not easily accessible and potential permits required).

None

MEDIUM IMPACT

• Observations can continue however the radial velocity precision will be impacted.

Vac Cart

Turbo Pump

Leybold TurboVac 450iX

1x

VERY DIFFICULT

Vacuum chamber gate valve must be closed, and Vac Cart enclosure opened to replace pump. Vacuum pressure within chamber will be rising during this time (affecting instrumental stability), making this replacement time-sensitive. A WMKO turbo cart could be connected to the chamber during the replacement to help minimize the vacuum pressure change.

None

MAJOR IMPACT

• Chamber would start to lose vacuum pressure

• During time required to obtain replacement pump, vacuum pressure would rise significantly and reset the instrumental stability time series.

Vac Cart

Roots Pump

Leybold EcoDry 65 Plus

1x

VERY DIFFICULT

Vacuum chamber gate valve must be closed, and Vac Cart enclosure opened to replace pump. Vacuum pressure within chamber will be rising during this time (affecting instrumental stability), making this replacement time-sensitive. A WMKO turbo cart could be connected to the chamber during the replacement to help minimize the vacuum pressure change.

None

MAJOR IMPACT

• Chamber would start to lose vacuum pressure

• During time required to obtain replacement pump, vacuum pressure would rise significantly and reset the instrumental stability time series.

Vac Cart

Isolator Stepper Motors

Lin Engineering 4118M-06S-22RO

5x

VERY DIFFICULT

Requires warming up CCDs, venting main spectrometer vacuum chamber, and opening chamber door(s) to gain access to the motors under the optical bench. Depending on the motor’s location, the Vac Cart, Aux Rack and LN2 Autofill system might need to be disconnected and moved out of the way so the chamber door can open.

Used very infrequently (mainly for initial alignment of bench). Powered off when not in use.

None

SMALL IMPACT

• Loss of one motor could likely be compensated for through adjustment of the other four.

• It is very unlikely we would vent the chamber to only replace one of these motors.

Aux Rack

Cryostat Ion Pumps

Gamma 3SDI1V5KNN (3S TiTan)

4x

VERY DIFFICULT

Requires warming up CCDs, venting main spectrometer vacuum chamber, and removing the large camera-access flange on the side of the vacuum chamber.

500 hours at 1e-4mbar

5,000 hours at 1e-5mbar

50,000 hours at 1e-6mbar

500,000 hours at 1e-7mbar

None

Each cryostat has two ion pumps.

• If one fails: SMALL IMPACT

• If both fail: MAJOR IMPACT

  • CCD thermal control will be lost

Aux Rack

LN2 Pumps

Instec LN2-SYS

2x

MEDIUM DIFFICULTY

The pumps are easily accessible on the LN2 cart in the basement. Marked as medium difficulty given the steps involved:

• power down the appropriate Instec controller;

• connect the new pump and power it on;

• turn the Instec controller back on;

• ensure Instec set point is correct and temperature control enabled.

There is also some risk involved, as care must be taken to avoid water vapor getting into the lines (leading to ice blocking the lines). If ice blocks the lines then the CCD must be warmed up and the lines purged (with a major disruption to the instrument stability timeline).

MAJOR IMPACT

• CCD thermal control cannot be maintained with the LN2 pump running. The CCD will start to warm up.

ruLN2 Cart

Autofill Solenoids

2x