ELOG OPERATION-2023

Between 18 and 20 we show a prossible transiant signal, PPL, of the lower branch. But a problem with the monochromator in the MID opt Hutch trigger the valve to close. After we where not able to see the signal possible effect of laser or X-ray inestabilities.

Problems with the liquidjet, the nozzel got clogged.

Started the aligment of the upper branch of SDL

18 Mar 2023, 01:45

Johannes Moeller

shift summary

stable HXRSS delivery at 8.99 keV, 1 bunch. XGM intensity during the day decreased from 750 uJ to 600 uJ.
Vacuum in sample chamber stabilized with cold trap and full beam path opened to AGIPD and endstation
Again problems with smaract stages in DES, but imager in a good position to continue.
First scattering data recored from water jet. Unknown, bimodal intensity distribution
Focus characterization of SDL lower branch with knife edge, X-ray eye and SAXS speckle data. Larger (>10 um) as compared to direct beam with same focussing setup.
Clear influence of splitter insertion on beamsize observed. Beam is smaller without splitter crystal.
Current status: Alignment of upper branch unfinished, X-ray eye inserted, sample chamber vented

For the next shift:

Finsish alignment of upper branch
Characterize both beams in size with Xray eye. Try if slightly different lense combinations or M2 bender settings improve the situation.
Overlap both beam on the sample
Possibly insert upstream pinhole just in front of jet to clean up and ensure overlap
Take data, enjoy

19 Mar 2023, 02:01

Johannes Moeller

shift summary

upper and lower branch of SDL aligned
- beamsizes and angular mismatch characterized
vacuum leak of flight path fixed
side view microscope re-aligned
problems with replaced MPC diamond detector. issue with in-vacuum cabeling suspected
misconfigured timing of AGIPD fixed
splitting ratio of SDL detuned while HXRSS intensity decreased significantly. Possibly correlated.

With the current HXRSS intensity and focussing, we have insufficient conditions to take data for the experiment. We decide to vent the sample chamber and try to fix the malfunctioning diamond detector instead of taking data over night. HXRSS should be improved tomorrow morning and the SDL possibly realigned afterwards.

Addition to previous issue:

Last incident (of overall 4), we had 0 bunches, moved in XTD1 ATT 0.6 and 1.2 mm CVD diamond in and 2.4mm CVD out. However, vacuum started to become bad already two days ago.

Update from vacuum OCD: Seems to be related to one leaky below of 2.4 mm CVD arm. Operational consequences are discussed right now.

Shift summary the 24th of Aug

MID takes the seeded beam about 200 uJ including SASE background.
Monochrometer is aligned.
Mono + CRL2 was tested.
Found rough timing with a fast diode at the sample position
Finding the temporal overlap with Forsted YAG hasn't been done yet. The motor (PPODL) doesn't change the laser delay, but LA2_LAS_PPL/CTRL/TRGDLY does. The values is not able to implemented into the Scantool since it doesn't have target position.
Photon energy spectrum was measured w and w/o mono with Gotthard at DES.
Nano focusing lens is aligned. The beam size is about 20 um X 20 um. Very stable pointing at the sample position.

1, 60 and 350 pulses at 8.7keV, HXRSS

*focus characterization CRL2 lens 3,5,6
*Si 20nm XPCS with 20 and 50 pulses to evaluate the contrast
*damage and dynamic studies on HGW with 1 and 350pulses and different attenuation and different temperatures

HXRSS tuning is ongoing during the night, we leave the beam on the MID spectrometer and the zoom session open for tuning.

HXRSS at 8.8 keV, 1, 60 or 350 pulses. Quite stable seeding performance

loaded new sample (HGW) in the morning
measured full temperature series on HGW during the day
problem with vacuum in the cryostat-chamber, which triggered the interlocked during the data taking and blocked AGIPD for some temperatures
focussing optimized in the evening and relaxing the bender, with 2-3 times better contrast determined. Please don’t touch CRL2 from now.
loaded new sample in the evening, but insufficient vacuum in the user chamber prevents opening the valve to the AGIPD first

stable delivery of 1mJ at 18keV SASE
succesful beamline alignment for MID (CRLs + M1 and M2) with mono.
alignment of NAFO stack to DES and zyla camera with SASE and monochromatic beam
setup of DES spectrometer for 18keV on 440 reflection with SASE
timing of PP laser with perpendicular excitation condition with diode and YAG

Problems:
Mirror M2 needs 30min to move from SASE to Mono position

stable delivery of 1mJ SASE at 18keV
NAFO lens characterization with caustic scan
successful detector calibration of AGIPD with LaB6 and alignment of Jungfrau to diffraction signal with LaB6
test of ptychography with 18keV (not successful)
successful setup of online holography analysis with test measurements

stable 18 keV SASE delivery
measurement of siemens star in the morning
alignment of phase plate for the nano focussing lenses
testing and debugging of the pulse on demand macro
holography test measurements and optimization of online analysis
alignment of user samples

Problems:

FSSS ScannerX had to be shutdown and initiated quite often
We lost the output of the pp laser at 22:30. Laser OCD could solve the problem and the laser was back at 23:45.

Stable delivery of SASE at 18 keV. The intensity dropped slightly from 1mJ to 0.88mJ during the evening, but everything good.
fixed the laser pulse-on-demand + FSSS scanning macro
We take some images series of the laser drilling process for different laser fluences
We started to take first time resolved data

The Si 0.5mm absorber of XTD1 attenuator seems to be damaged. First screenshot is with that one inserted. In the second screenshot, it is replaced with a Si 0.5mm from MID_XTD6_ATT.

*Tests for online XPCS pipeline ongoing
*beam optimization with power slits, current beam size 8x13um (v x h), we assign the larger value in the horizontal direction to jitter
*Movement of the AGIPD quadrants to increase q range to lower values
*analysis and update of Sample to detector distance and geometry
*ScannerX of the FSSS is crashing very! frequently.

124

04 Apr 2023, 11:18

Johan Bielecki

XTD2 Si500 attenuator broken

Attachment 1: Beam in SPB hutch with Si500

Attachment 2: Beam without Si500

Beam delivery for proposal 3378

Achievements/Observations

Collected data on liquid H20 and D20
Found conditions where only ice were seen. approx. 4h of ice data taken. Starting to look at correlation maps
Background at 0.88mm nozzle distance measured

To do for next shift:

Continue taking data

Beam delivery for proposal 3378

Achievements/Observations

Collected large amounts of data for the user program on water crystallisation and angular correlations

To do for next shift:

Continue taking data

X-ray delivery

12.42 keV, stable delivery in single pulse mode with 1.9 mJ/pulse

Optical laser delivery

532 nm ns-laser for sample pumping

Achievements/Observations

Collected protein crystal diffraction for three different samples with varying laser delay and fluence. LCP viscous jet sample delivery.
Stable CRL focus using tunnel collimation with 3 XTD2 lenses followed by 17 focusing lenses in SPB hutch. 2 um FWHM focus with <1um standard deviation in 'X' position.
- 3 XTD2 lenses gives a round X-ray beam approx 1 mm in size, such that we are almost overfilling the CRL apertues in SPB.

Issues

Some initial jetting issues, which have now been solved.

29 Oct 2022, 11:03

Jaydeep Patel

Jet alignment test- obeserver

Nozzle type	Nozzle Aperture(µm)	Sample	Jet Speed(m/s)	He flow rate	Liquid flow rate	Repetition rate	Beam Attenuation (%)	Run No.
GDVN B	75	Water	25	10	80	0.5	9	122
			30	13	60	0.5	9	123
			40	20	30	0.5	23	124
			45	25	30	0.5	23	125
			50	32	30	0.5	23	126
		Buffer 1	25	10	80	0.5	31	141
			30	14	60	0.5	31	140
			40	20	30	0.5	31	139
			45	26	30	0.5	31	138
			50	32	30	0.5	9	137
		Buffer 2	25
			30
			40
			45
			50
		Crystal size 1µm	25	10	80	0.5	16	131
			30	13	60	0.5	16	130
			40	20	30	0.5	16	129
			45	25	30	0.5	16	128
			50	32	30	0.5	16	127
		Crystal size 2-4µm	25	10	80	0.5	12	132
			30	13	60	0.5	9	133
			40	20	30	0.5	9	134
			45	25	30	0.5	9	135
			50	32	30	0.5	9	136
		Crystal size 5 µm	25	10	80	0.5	9	142
			30	13	60	0.5	9	143
			40	20	30	0.5	31	144
			45	25	30	0.5	29	145
			50	32	30	0.5	29	146
DFFN JKMH8.11 8.11=75-70-70	75	water	25	13	80	0.5
			30	13	40	0.5
			40	20	20	0.5
			45	25	15	0.5
			50	32	15	0.5
		Buffer1	25
			30
			40
			45
			50
		Buffer2	25
			30
			40
			45
			50
		Crystal size 1 µm	25
			30
			40
			45
			50
		Crystal size 2-4 µm	25
			30
			40
			45
			50
		Crystal size 5 µm	25
			30
			40
			45
			50
GDVN C/C4 C=100-90-100 C4=100-75-100	100	Water	26	15	80	0.5	58%	172
			30	20	60	0.5	58%	171
			40	35	25	0.5	58%	170
			45	37	25	0.5	58%	174
			50	40	18	0.5	58%	175
		Buffer 1	26					180
			30					179
			40					178
			45					177
			50					176
		Buffer 2	25
			30
			40
			45
			50
		Crystal size 1 µm	25				31%	181
			30				31%	182
			40				31%	183
			45				31%	184
			50				31%	185
		Crystal size 2-4 µm	25				31%	187
			30				31%	188
			40				31%	189
			45	X	X	X	X	X
			50	X	X	X	X	X
		Crystal size 5 µm	25	20	80	0.5	16/ 31%	147/190c4
			30	30	60	0.5	31%	192
			40	40	25	0.5	31%	193
			45	40	15	0.5
			50	40	10	0.5

X-ray delivery

9.3 keV, 1-85 pulses, 1.3 mJ, stable delivery

Optical laser delivery

800 nm, 1-226 pulses, stable delivery except for shift change issues

Achievements/Observations

PP laser alignment and optimization at IRU and PAM
Aligned beam until IBS
Checked MKB focus
Timing at PAM
First signals on GOTTHARD II

Issues

Issues with shift change for PP laser. Intensity flucutation observed after shift change was done. This issue was similar to what was observed last year. We will inform LAS about this issue. No LAS OCD available to call before we leave after the shift (7:30 AM).

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