20:00UT, 28Jan98 - 11:00UT, 29Jan98

The following is the first data collection shift report from week II of the January98 HXDS FPC calibrations at BESSY. Operator shifts will cover a nominal 12 hours at the workstation. Ian and Tim will cover the 12:00UT to 00:00UT shift, Ed and Bill will cover the other.

• Ian and Tim arrived mid evening, Wednesday, 28Jan98, to prepare for first light on the White Light beamline.
• Test Chamber at 1.1x10-6torr, PTB aperture section at 8.1x10-8 mB
• FPC's at 400 torr P10
• Turned on HV for nominal 0.9 keV fpc_x2 at 1596 volts (Vset), 1606 (Vmon) fpc_hn at 1601 volts (Vset), 1611 (Vmon)
• Compared BESSY Sun and PTB beam current monitor times Sun = 21:11:45 UT PTB = 22:12:05 CET
• Attempted to take a background, but no counts or pulser showed up. Investigation lead to the discovery of LLD cables disconnected... wierd, they were connected earlier when we ran backgrounds. We reconnect, close the electronics cabinet, lock it and pocket the key.

I. Background Run

II. FPC Centering. After delays by BESSY which were required by them to finish beamline maintenance, we were given first light on this beamline around midnight and spent much time (Run ID's 501500 thru 501515) finding the beam with our 1.5 mm apertured fpc's. New beam center locations were determined and recorded.

• ly is now 23250 for both
• lz is -36875 for fpc_x2
• lz is 39275 for fpc_hn

Ian and Tim leave, Ed and Bill take over.

III. Gain checks and voltage adjustments. The following runid's were used to check gains and make voltage adjustments.

Run ID, CMDB ID, Fpc, Collect, Filter, Comments

• 501516, collect, hn, 100sec, Cr, none
• 501517, collect, x2, 100sec, Cr, none
• 501518 - 501519, collect x2 - Cr, Shutter closed, Fe55 search
• 501520 - 501522, NA
• 501523, collect, gain check, hn, - none, Shutter open, 4700hz, high voltage increased to 1610 (Vset; 1620 Vmon) on both counters.
• 501524 -501528, rate checks

IV. Data collection, Count RateLinearity (CR designation in CMDB ID) and Absolute Quantum Efficiency (AB designation in CMDB ID) measurements.

Run ID, CMDB ID, Fpc, Filter, Comments

• 501529, N-IXF-CR-1.225, x2, Cr
• 501530, N-IXF-CR-2.225, hn, Cr, Ib:9.00nA, rate:20337hz
• 501531, N-IXF-CR-2.220, hn, Cr
• 501532, N-IXF-CR-1.220, x2, Cr, Ib:8.955nA, rate:18612hz
• 501533, N-IXF-CR-1.215, x2, Cr, Ib:8.955nA, rate: 13210hz

computer time check: Bessy = 06:26:11, SAO = 05:25:51

• 501534, N-IXF-CR-2.215, hn, Cr, Ib:7.066nA, rate: 16132hz
• 501535, N-IXF-CR-2.210, hn, Cr, Ib:4.406nA, rate: 10199hz
• 501536, N-IXF-CR-1.210, x2, Cr, Ib:4.385nA, rate: 9458hz
• 501537, N-IXF-CR-1.205, x2, Cr, Ib:2.203nA, rate: 4839hz
• 501538, N-IXF-CR-2.205, hn, Cr, Ib:2.197nA, rate: 5180hz
• 501539, N-IXF-CR-2.215, hn, Cr, Ib:7.066nA, rate: 16132hz
• 501539, N-IXF-AB-2.24, hn, Cr, Ib:1.76nA, rate: 4177hz
• 501540, N-IXF-AB-1.24, x2, Cr, Ib:1.76nA, rate: 3900hz

Changed to Beryllium filter. Note current reading change to electrons.

• 501541, N-IXF-CR-2.125, hn, Be, Ib:982electrons, rate: 25415hz
• 501542, N-IXF-CR-1.125, x2, Be, Ib:976.21electrons, rate: 25415hz
• 501543, 1-D Scan in Z
• 501544, N-IXF-CR-1.120, x2, Be, Ib:782electrons, rate: 18725hz
• 501545, N-IXF-CR-2.120, hn, Be, Ib:780.38electrons, rate: 20618hz
• 501546, Aborted

Changed to Titanium filter.

• 501547, 1-D Scan in Z
• 501548, N-IXF-AB-1.22, x2, Ti, Ib:777.456electrons, rate: 3426hz
• 501549, N-IXF-AB-2.22, hn, Ti, Ib:776.743electrons, rate: 3670hz

Changed to Fe filter.

• 501550, N-IXF-AB-2.26, hn, Fe Ib:774.886electrons, rate: 4241hz
• 501551, N-IXF-AB-1.26, x2, Fe Ib:771.386electrons, rate: 3945hz

Changed to Be filter.

• 501552, N-IXF-CR-1.115, x2, Be, Ib:625.848electrons, rate: 15080hz
• 501553, Aborted
• 501554, N-IXF-CR-2.115, hn, Be, Ib:619.267electrons, rate: 16504hz

Changed to Chromium filter.

• 501555, N-IXF-CR-2.201, hn, Cr, Ib:619.255electrons, rate: 1146hz
• 501556, N-IXF-CR-1.201, x2, Cr, Ib:687.785electrons, rate: 1056hz

Changed to Beryllium filter.

• 501557, N-IXF-CR-1.110, x2, Be, Ib:408.652electrons, rate: 10118hz
• 501558, N-IXF-CR-1.210, hn, Be, Ib:487.725electrons, rate: 10965hz

FINISHED SHIFT. Look for the next shift report .... coming soon.

Edited 28Jan98.