Report from BESSY, Monday morning thru evening with comments thru Tues. morning

• Shift Start: Monday Oct 20, 1997, 8:00 a.m. local time (6:00 UT)
• Shift End: Monday, Oct 20, 8 p.m. local time (18:00 UT)

Operator: B. Wargelin

Configuration: SSD_5 on SX700, SSD_X on 12-20 (white beam)

The entire PTB crew was in a meeting that lasted all morning, and did not begin work on setup until 1 p.m. It then took until 7 p.m. for them to complete their setup, which included photodiode beam intensity calibration.

Frank Scholze recommended using the larger 1.2-mm aperture on the SX700 because it provides a more accurate calibration than the 140-um ap. The ap is about 1 m from the Ge crystal, and beam divergence adds another ~2 mm to the spot size. We therefore used the 5-mm SSD aperture for all tests. (Tuesday morning we compared rates with the 2-mm and 5-mm aps. They were the same to within a few percent, indicating the beam size is ~<2 mm when it hits the SSD.)

BESSY no longer runs at 850 MeV, so we ran at 800 MeV.

Beam current is recorded continuously, so no MCB gating is required. For the record, the HXDS computer reads about 10 seconds ahead of PTB's.

All msmts are Spectral Response Function/QE. The QE maps are lower priority and were skipped for this first time through. All runs 1000 sec unless noted.

Test runs listed as: RunID, CMDB-ID, Energy, start (UT), and additional notes

• 500352, L-IXS-QE-1.001, 400eV, 17:09:40, 1300hz, Used Cu filter instead of Fe--no good
• 500354, L-IXS-QE-1.002, 450eV, 17:41, 1050hz
• 500355, L-IXS-QE-1.27, 1700, 18:02, 2000 sec at 450 Hz

The remainder of tests listed below were run on the next shift.  They are listed here as copied from Brad's email report which includes comments thru Tuesday morning, October 21, 4:00 am local.

• 500356, aborted, flux was changing
• 500357, L-IXS-QE-1.01, 500eV, 18:42
• 500358, L-IXS-QE-1.04, 600eV, 19:09, 1300 sec at 780 Hz
• 500359, aborted to change integration time
• 500360, rate linearity, 700eV, 19:40, 2000 Hz
• 500361, rate linearity, 700eV, 19:42, 1500 Hz
• 500362, L-IXS-QE-1.05, 700eV, 20:26, 1000 Hz
• 500363, L-IXS-QE-1.06, 800eV, 20:46
• 500364, aborted--partial beam loss part way thru
• 500365, wrong procedure, wrong detector
• 500366, L-IXS-QE-1.08, 1000eV, ___, 1500 sec at 700 Hz
• 500367, aborted to increase integration time from 1000 sec to 1500 sec
• 500368, L-IXS-QE-1.09, 1100eV, ___, 1500 sec at 700 Hz

SSD_X on White light (12-20) beam

All measurements are of relative aperture size.  Integration times are 100 seconds.

Test runs listed as: RunID, CMDB-ID, Aperture Size

• 500369, collect to see white light rate
• 500370, L-IXS-AP-2.06, 40 um
• 500371, L-IXS-AP-2.05, 50 um
• 500372, L-IXS-AP-2.04, 70 um
• 500373, L-IXS-AP-2.03, 100 um
• 500374, L-IXS-AP-2.02, 200 um
  
  

For runs 500370-374, ignore the autoDeadTime_pulses. The BH-1 pulser is feeding both SSDs, but the TTL output from the DB-2 pulser was being fed into the deadtime counter. The pulser was very stable, however, so the measurements are still valid. For subsequent runs, the TTL output from the BH-1 feeds both deadtime counters.

The rest of the beam was lost at about 3:30 a.m. Tuesday local time. There was no reinject until 7 a.m. Tuesday morning.