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Strawman TXR Deployment Test Plan For a Generic Host Chamber

Strawman TXR Deployment Test Plan For a Generic Host Chamber. Joe Rice National Institute of Standards and Technology Gaithersburg, MD. Introduction. This presentation is intended as a generic example of how a TXR deployment might work, and is intended for those who need a practical example.

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Strawman TXR Deployment Test Plan For a Generic Host Chamber

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  1. Strawman TXR Deployment Test Plan For a Generic Host Chamber Joe Rice National Institute of Standards and Technology Gaithersburg, MD

  2. Introduction • This presentation is intended as a generic example of how a TXR deployment might work, and is intended for those who need a practical example. • We present this as a generic case because certain interface and test plan details for specific chambers may be considered confidential. • Because of the many assumptions that must be made for the generic case, the test plan details would be expected to vary greatly for a specific chamber. • Despite this, it is the intent to keep total chamber time involved with the deployment to below 2 weeks.

  3. Assumptions about Generic Host Chamber • TXR has a direct view of black body source (no mirrors). • Environment is near room temperature, vacuum. • Blackbody source under test is variable temperature, within the range 200 K to 400 K, with ability to come to equilibrium within an hour for successively increasing setpoints. • Cooling black body and environment from highest T to lowest T can be accomplished overnight. • Time from chamber closure to initial TXR LN2 fill is <24 hrs. • Time from end of testing to chamber opening is <24 hrs. • Normal work hours are within 8am - 6pm , Monday through Friday. (Although we assume this here, we can certainly accommodate a 24 hr work schedule where that is the norm.)

  4. Major Objectives of Test • Measure response of TXR Channels 1 and 2 to the black body in-situ radiance at a statistically significant number (9 or more) of well-equilibrated temperatures that span the range used. • Repeat the measurements at least once under identical conditions, presumably on a separate day(s).

  5. Two-Week Chamber Test Plan • Week 0: TXR and its accessories (about 1200 lbs gross weight) are delivered to host facility and are located in an off-line space. • Week 1, Monday (optionally could be moved up to Week 0, Friday): • Unpack & begin repumping TXR cryostat vacuum with turbo pump. • Functional checkout of TXR at room-temperature. • Week 1, Tuesday: • Valve-off TXR cryostat vacuum space. • Load TXR cryostat into chamber and position TXR racks. • Make electrical connections to cryostat and racks & power up. • Align TXR with respect to source under test using TXR laser. • Make cryogenic connections to TXR cryostat. • Close chamber and begin chamber pumping. • Week 1, Wednesday: • Initial LN2 fill of TXR cryostat (<30 minutes). • Preliminary TXR measurements at lowest black body setpoint.

  6. Two-Week Test Plan (continued) • Week 1, Thursday: • First day of genuine data acquisition. • Series of source T’s from lowest to highest, reaching equilibrium at each of 9 pre-determined setpoints. • TXR acquires 10 minutes of data into reduced data files at each equilibrated T plateau. • Source under test set to cool back to lowest T overnight. • TXR performs automated checksource measurements overnight. • Week 1, Friday: • Repeat of Thursday: second day of genuine data acquisition. • Quick assessment of data repeatability. • Week 2, Monday-Thursday: • Contingency for problems. • Optionally: more repeats of genuine data acquisition. • No LN2 refill on evening of last day. Purge cryolines to warm up overnight. Backfill chamber to assist warming.

  7. Week 2, Friday: • Ensure that cryoline temperatures are above dew point. • Open chamber, remove TXR cryostat. • Pack TXR and its accessories. • Week 3: • TXR is shipped back to NIST.

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