# Presentation: 000997

## Strawman TXR Deployment Test Plan

- For a Generic Host Chamber

- Joe Rice
- National Institute of Standards and Technology
- Gaithersburg, MD

## 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.

- Introduction

## 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.)

## 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).

## 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.

## 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.

## 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.