KPF: [Pre-Observing] | [Observing] | Post-Observing

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LN2 Based Procedures from Kodi


CCR Warm Up Procedure

See day log K1-35087

  • Power off the ion pumps

    • modify -s kpfgreen COL_PUMPON=No

    • modify -s kpfgreen ECH_PUMPON=No

  • Set the lakeshore to ramping control with a rate:

    • modify -s kpfgreen COLDHEADRMO=on COLDHEADRMP=1.5

    • modify -s kpfgreen STA_CCDRMO=on STA_CCDRMP=1

    • The ramp units are degrees per minute

  • Change the target temperature

    • modify -s kpfgreen COLDHEADTRG=40 STA_CCDTRG=40

CCR Cool Down Procedure

  • Set the ramp rates:

    • modify -s kpfgreen COLDHEADRMO=on COLDHEADRMP=1.5

    • modify -s kpfgreen STA_CCDRMO=on STA_CCDRMP=1

  • Start the cold head cooling:

    • modify -s kpfgreen COLDHEADTRG=-110

  • Wait a few minutes to let the CH start cooling, then:

    • modify -s kpfgreen STA_CCDTRG=-100

  • Once everything is down to temp or levels off because of the higher partial pressure in the cryostat then give it another 2 hours and turn on the ion pump:

    • modify -s kpfgreen COL_PUMPON=Yes

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