AXAF HXDS Calibration at PTB-BESSY Page
Calibration Test Run #3

Test Plan Outline. The attached test plan outline is presented here as an overview of what we plan to accomplish.


Week I. (18Jan-24Jan, 1998)

Test Setup 

We arrived in Berlin on Sunday, 18January after flying through the night as usual. Monday morning we began setup at 8:30am on the KMC beamline and finished at 10:30pm, leaving the test chamber to pumpdown over night. The two FPC's (fpc_x2 and fpc_hn) are mounted inside the test chamber on a Y-Z stage assembly. The portable gas system is supplying gas (P10) to the two FPC's at a pressure of 400 torr. Five of our test filters are mounted to a linear slide assembly in front of the test chamber. The PTB installed "getter" pump on our test chamber door did not improve overall pumping capacity because we could not get into the low 10-6 torr range where it starts working efficiently. Also, the "getter" pump proved too noisy for our detectors ... it will be removed for the next setup. A vacuum of 1x10-5 torr was reached and we were given approval to open our test chamber to the KMC beamline.


Week II. (25Jan-31Jan, 1998)

Test Setup 

We arrived at the PTB-BESSY facility early on Saturday morning to remove the test chamber from the KMC beamline and install it onto the white light beamline. All equipment was succesfully moved over and installed.  Ian Evans was picked up at the airport midday.  We started pumping on the chamber with our turbopump by 3:30pm.  The PTB turbopump failed and was replaced, then the new PTB gate valve installed on our test chamber door could not be operated because it required a 24 VDC power supply instead of the 220 VAC supply intended.  This would be rectified on Monday. Pump pressure looked good at 2x10-6 torr on Monday and would improve once the PTB pump was made operational.  Tuesday we started a low temperature bake of the test chamber to help outgas all the cables. We ran a complete system check on Tuesday with few difficulties (cable connections mostly and two chip replacements). Testing will start Wednesday evening at 10:00pm and continue for 48 straight hours.


Field Reports


"After Dark03"

What we do when we aren't working ... it's amazing what you can do when you haven't got much time to do it in .....


This page last updated April 07, 2000