X-ray delivery

• 9.3 keV, 120 pulses
• Good Beam Stability -~1mJ

Achievements/Observations

• Double Slit and V-Pattern Interference Measurements
• Nearfield Ptycho-Scans
• Nano-KB (@Richard)

Issues

• Office network webcams extremely slow in control room
• X-ray delivery jddd display computer frozen again (related to ubuntu update?)

Instrument status

• AGIPD HV off.
• AGIPD gate valve closed and pinned.
• Attenuators set to thickest diamond.
• Vacuum valves closed.
• YAG in-beam in interaction region.

To do for next shift

• End of beamtime - Nearfield ptychography experiment not completed, may require time during the week
• NanoKB partially aligned  - see dedicated post

8.2 keV, 750 uJ. 

Short summary

- Optimize the downstream nanofocus CRL to image the sample to our detector (optique Peter) - successful)

- Then we put a upstream nanofocus to focus on our sample location to directly image the x-ray spot. We scan Z to get the beam profile at different Z. - successful

- It appears that we couldn't get the best focus. The upstream CRL should move further toward the sample by a couple of cm. 

- We tried doing the edge scan. Scan tool clash the DAQ and we couldn't run the data. 

- Then, we used Extra-metro to do the edge scan. It was ok, but the observed values are scattered and normalization seems not working properly. Should analyze in more detail. Runs are taken 

- The spatial resolution of our imaging system seems to be about 2 um, most likely limited by the point spread function of the scintillator (mfp of excited electrons).  

- Then we put the Optique Peter further downstream by 2 m to gain magnification and better resolution. It appears that in order to image the sample to the Optique Peter at the end of the hutch, we need to move the downstream CRL toward upstream by about 4 cm. 

Details. 

19 Feb 2023, 23:33 Handover done. Although PAM work was suggested, Toma switch off the laser. So this task is impossible. Also, we do not have a flat-field to align samples. 

19 Feb 2023, 23:34 Put a Siemens Star in (pos. #25). No image is seen on the Optique Peter. We moved FSSS Y and X to find. We moved about 100-200 um. 

19 Feb 2023, 23:41 CRL4-B 'in' position was AXIS21 = 27.4 (different from yesterday). We moved out by moving 

19 Feb 2023, 23:42 Move out the CRL4-B. The beam center of mass is upper part of the slit. Touch M3 pitch via piezo. Siemens star image at the beginnig: Att.1.

19 Feb 2023, 23:52 Move Z of CRL4-B. Initial position: 52.77. Move by 5 mm. Image quality clearly worse. We move 2 mm steps. Each step, we see the difference in contrast.

19 Feb 2023, 23:59 Now, scan with 1 mm steps. The conclusion is that 51.77 +/- 2 mm is the best.

20 Feb 2023, 00:16 Go to the free space. Attenuate the x-ray beam further by x100 (T = 1e-4). Put CRL4-A. 

20 Feb 2023, 00:20 It appears that we did not need to add the attenuator. So, stay as it was: ~1%

20 Feb 2023, 01:30 Finished scanning Z. See ID47. The best spot size seems to be before the TCC even at the maximum Axis_5 position at 105 mm. 

20 Feb 2023, 01:50 We now move the CRL4-B focus to find the smallest spot. The smallest spot is found when we moved ~20 mm in Z. The smallest spot observed corresponds to 2 micron, which is probably our limitation of the imaging system, not necessarily the actual x-ray focus. See ID47 

20 Feb 2023, 02:05 Edge scan. We first put the Ni edge as suggested, but then realized that 25 um Ni at 8.2 keV only absorbs 70% of the x-ray beam (below K-edge). Therefore, we put the edge of the Si substrate of the Siemens stars. But this doesn't give a nice result. Switch to Ni mesh. Better, but the result is not convincing. 

20 Feb 2023, 03:45 Continue focus scan. See ID 47 for details. 

20 Feb 2023, 05:00 Put the Optique Peter at the end of the hutch. Initial distance = 56 cm (Att.1). Current distance 270 cm (~ 480 cm from the exit flange of IC1). 

20 Feb 2023, 05:43 Put extension flight tube 3 m (and remove the 50 cm one). Att. 2. Start pumping IC1.

20 Feb 2023, 06:00 Found Siemens star. But we reached the HW limit of the downstream CRL in order to image the TCC to the Optique Peter. See ID50. 

19 Feb 2023,15:30 Shift handover

Runs will be added in the general Elog for data runs and acqusitions (Elog-4)

- alignment of new wires to shoot with relax laser
- pump probe X-ray imaging with CRL4-a  (DAQ runs 306-320)
- realignment of CRL4b to compare data with CRL4-a imaging capabilities
- resolution check with X-ray only runs on siemens star (DAQ runs 321-323)
- shots with crlb (DAQ runs 324-347)

19 Feb 2023, 19:53 : DAQ crashed
19 Feb 2023, 19:56 : DAQ revived after restarting it
19 Feb 2023, 20:36 : All remaining wire are shot. We pass to shock target. Instead of doing side-on radiographs we go to face-on scheme (radiography colinear to the shock propagation.) |
19 Feb 2023, 20:40 : shock target alignement
19 Feb 2023, 22:16 : Shock targets shots (DAQ runs 348-390)
                                               Beautiful pictures here!!!!!!

Resumen of the shift: align and shoot, with beautiful images at the end (which was the main goal of the beamtime this week) .

Last night shift tasks :
- getting final siemens star and free beam radiographs with CRL4b (to see if the resolution keep consistant over time: it should be, but it is better to check it)
- Go back to CRL4a
- go as far as possible from tcc, and do edge scans with Ni foil (the one juste on top of NTT grid)
            - do refined edge scans every 5mm all along the travel range of CRL4a
- for next week, PAM time =0 needs to be as precise as possible, preparation of PAM for next beamtime.
- Going through Bspec data acquired today
 

19 Feb 2023, 08:08 Hand over from night shift

Added polarizer in the PAM beam in the optics hutch, reequilibrated reference arm of PAM

19 Feb 2023, 08:09 Darks taken for JF 1 and 2

19 Feb 2023, 08:28 Check sample alignment, correct for shot samples

19 Feb 2023, 08:33 Beam was off on Zyla, M3 feedback had to be restarted this morning. May this changed the setpoint. New setpoint is now at 342.4

19 Feb 2023, 09:09 Aligned edge of Cu foil on Zyla, then moved ILM to get a sharp image of the edge, then focus RELAX beam to this position

19 Feb 2023, 09:11 OAPX motor is in permanent error state

19 Feb 2023, 09:17 Focal spot does not look nice,

19 Feb 2023, 09:40 Start shooting foils

19 Feb 2023, 09:51 Cu foil  w Al B3-A3 , delay RELAX 100 fs before x-rays, run 257, seems we destroyed foils next to it

19 Feb 2023, 10:16 DOC called, OAPX is working again, reason unknown, seems to be an issue with the encoder. Needs checking the encoder on site.

19 Feb 2023, 11:09 Finished aligning samples, preparing for shot

19 Feb 2023, 11:15 Cu foil  w Al B3-A1, delay RELAX 200 fs before x-rays, run 260

19 Feb 2023, 11:23 Cu foil B3-B2, delay RELAX 200 fs before x-rays, run 262, sample next to it was damaged

19 Feb 2023, 11:39 Cu foil B3-B3, delay RELAX 200 fs before x-rays, run 264

19 Feb 2023, 11:46 Aligning grids

19 Feb 2023, 12:07 OAPX again in error state, used this time AY rotation instead, did not really change the focal spot. Add this motors to the switcht off

19 Feb 2023, 12:14 Cu mesh 2000 C3B3, delay RELAX 200 fs before x-rays, run 266

19 Feb 2023, 12:21 Need much longer delays, will go to RF locking

19 Feb 2023, 12:43 Phase shifter device was stuck in moving state, restarted

19 Feb 2023, 12:45 Cu mesh1000 C3B1, delay RELAX 2000 ps before x-rays, run 268

19 Feb 2023, 13:00 Cu mesh 2000 C3B2, delay RELAX 500ps before x-rays, run 270

27019 Feb 2023, 13:07 Seems that RELAX does not hit exactly in the field of view, change to configuration CRL4B

19 Feb 2023, 13:19 Cu mesh HEX 1000 C3A1, delay RELAX 500ps before x-rays, run 272

19 Feb 2023, 13:22 Shot is fine, stay with CRL setting, realign samples

19 Feb 2023, 13:50 DOC called, some motor flags have been changed for OAP_X. hopefully ito works until tomorrow

19 Feb 2023, 13:54 Cu mesh2000 C2A5, delay RELAX 100ps before x-rays, run 274

19 Feb 2023, 14:00 Cu mesh2000 C2A3, delay RELAX 20 ps before x-rays, run 277

19 Feb 2023, 14:06 Cu mesh2000 C2A2, delay RELAX 20 ps before x-rays, run 280

19 Feb 2023, 14:13 Cu mesh2000 C2A1, delay RELAX 500 ps before x-rays, run 284

19 Feb 2023, 14:17 Cu mesh2000 C2B1, delay RELAX 1000 ps before x-rays, run 287

19 Feb 2023, 14:23 Cu mesh2000 C2B2, delay RELAX 1000 ps before x-rays, run 290 PPU was open before shot and closed during shot

19 Feb 2023, 14:27 Cu mesh2000 C2B3, delay RELAX 1000 ps before x-rays, run 291

19 Feb 2023, 14:31 Cu mesh2000 C2B4, delay RELAX 80 ps before x-rays, run 295

19 Feb 2023, 14:35 Cu mesh2000 C2B5, delay RELAX 666 ps before x-rays, run 298

19 Feb 2023, 14:38  Moved Siemens star in (pos 25), run 300, is out of range, tried then pos 2, visible in live view, run 301

18 Feb 2023, 23:37 Together with the last shift members, we continued shooting laser on Cu 25 um thick wire for another 2 hours. We got excellent quality x-ray imaging with a series of time delay up to several ns (eLog ID 39).  X-ray imaging is now commissioned. The magnification was x7.5.

19 Feb 2023, 01:30 We tried to go to x20, but we couldn't find the x-ray beam. We even put the burn paper in front of the Optique Peter to verify the x-ray position, but still we couldn't see anything on the Optique Peter. Probably the x-ray was too weak. This activity was done with CRL4b "in", so the beam size was big on the Optique Peter. Next step is to remove the CRL3b and do the same exercise.

19 Feb 2023, 03:00 We switch to CRL4a (upsteam of the sample) and aligned.

19 Feb 2023, 03:30 In parallel, PAM work: added 10 mm thick SF57 on the spectral arm. Time = 0 is established for both spatial and spectral arm. See eLog ID 33.

19 Feb 2023, 06:10 Put a mesh 2000 lines and do the focal scan. 1.5 % transmission. Att.1. The focus is around Axis_5 = 95-100 mm.

X-ray delivery

•  9.3 keV, 1-120 pulses,
• good stabiltiy, lowish flux ~900uJ, but experimental requirements were met

Achievements/Observations

• Finished doule slit measurements at micron beam
• Alignment to direct beam
• Sample position for the sand paper found
• Some sand paper test speckle patterns measured

Issues

• Alignment was a bit painful without the NKB and EHC cameras - switch to ZYLA at EHC made ALAS alignment much easier
• diff pump does not transmit much of direct beam without interference and requries tight power slits (known limitation)

Instrument status

• AGIPD HV off.
• AGIPD gate valve closed and pinned.
• Attenuators set to thickest diamond.
• Vacuum valves closed.
• EHU PSLIT closed around direct beam to approx 1.2 x 1.2 mm
• sample moved up by 10mm so both rows accessible in direct beam
• current 'focus' sample position is approx location of sandpaper from evening measurement (lower row, darkside), 10mm in +x moves out of beam

To do for next shift

- continue direct beam speckle measurements (See entry elog:138)
- quite a bit of scattter on AGIPD from direct beam and especially sandpaper samples.
- transmissions of at least ~1 % level are detector safe (no pixels in AGIPD medium gain)

Achievements

• Used scanning of liquid jet to improve S/N
• Measured x-ray PP XAS as a function of the delay between the two X-ray colors
• Scan energy of probe pulse with fixed pump energy

Problems

• No clear signature of ionized states observed in XAS yet

Ealier shift members managed to get a good quality image on Optique Peter by imaging the sample plane to the Optique Peter with downstream nanofocus (CRL4b). The quality is far superiour compared to the one with upstream nanofocus, which does just a projection of sample (backlight). The decision is to stay with the downstream CRL. They had a few full power shots. The problem of reading Zyla data when rotation = 0 is solved by Olly. He put the script in the shared folder. 

As no laser shots during the night shift, the plan for the night shift was to align as many AWE samples as possible so that we can shot tomorrow morning.

We successfully aligned samples (about 20 samples) which are in A-2 slot. Then, very, very, unfortunately, when we went to the A-1 samples, the top part of FSSS bump the ILM and we could not recover it. We have two choice now for the morning shift; whether we shot currently aligned samples (without checking the laser focal spot and timnig - those are should not be so wrong as it was checked late last evening by the late shift members); or, open IC1 and realign the ILM...

%%%%

18 Feb 2023, 00:33  Aligned the sample A2-E5. The laser comes from the top. What we see here is the 10 um thick Al top layer. The CH (~500 um thick) is below the Al on the screen, which is almost fully transparent for the x-ray beam. Att. 1

18 Feb 2023, 00:56 In order to optimze the rotation of the sample (so that the thickness projetion on the Optique Peter is minimum), we used the Hexapod "w". Unfortunately, this motor value is not saved onto the sample position table. Therefore, all previously saved positions are not valid any more. The current "w" value is -5.300 (att.4). We should not touch this value any more.

Att. 5 is the previously saved sample positions. We will delete many of these positions as those are not valid any more.

18 Feb 2023, 00:58 We aligned the wire to FSI, ILM and Optique Peter. Att. 2 and 3.

18 Feb 2023, 03:56 There was a collision with the ILM, when going to the top row on the target (AWE A2-B1), targets no longer visible on ILM. Wire also shows O(10um) offset on OptPeter. Previously aligned targets will be off.

18 Feb 2023, 04:23 We realign the wire, reproducible with a 20um offset applied in hex_x and hex_y (saved on the target positions)

18 Feb 2023, 04:24 We start a scan of ILM position to try and recover FoV (5 x 5 mm window, 2D scan, 250 um steps). No success; we couldn't find the flatfield. One suggestion is to shoot currently aligned targets blind.

18 Feb 2023, 05:00 Enter the hutch A.12 to connect the Timepix3. Radiation dose search.

18 Feb 2023, 05:20 Carsten optimized the CSLIT.

18 Feb 2023, 06:00 Moto worked on PAM. Found the time = 0  at 'spectral' encoding. Detail is in the corresponding eLog.

17 Feb 2023, 17:15 : We centered Pin in the FEL beam and then imaged this pin with ILM and FSI to get common references.
                                 We corected astigmatism with OAP
                                 Then we introduced CRLb into the X-ray beam path and centered the CRLb to the beam axis.
                                 Then we translated crlb to to sharpen the image of the pin (i.e. meaning we are in imaging plan of CRLb).
                                 Aligned positions for crlb are:
                                   - detm20=56.069mm (longitudinal translation to the X-ray beam)
                                   - detm21= 27.322
                                   - hexapod:
                                              - x =   0.000   /  y=  0.000    / z= 0.040
                                              - u =  -0.250   / v=  0.000     /w = 0.260
                                   - image of the pin in CRLb can be found in att-1 7 att-2 (more zoomed)
                                   - sad that there is a weird halo due to CRL imperfections around the center fo the FOV.
                                   - Few free beam shots will need to be taken to be able to substract such structures in postprocessed images.
17 Feb 2023, 17:37 : We now move toward the Siemens star to optimize the definition of the focal plan of CRLb, and estimate the FOV (siemens start diameter being about 50um diameter)
                                 Adjusted position of detm20 to have the samples in the imaging plane of CRLb is: detm20 = 63.07mm
                                 We take a run to image the Siemens Star. It seems that resolution may be better than 1um, and we start to see the numbers.

Run 123 : Siemens star imaging in focal plane of the CRL4b.

                        To be noted: the FOV seems to be about 3 time the diameter of the Siemens star. However, defects of the CRL in the center of the FOV are problematic, and we need to outcenter the image to get a clean imaging.
                         Therefore, we have only a third of the FOV usable.

Run 124 : imaging of the pin

We move detector bench by 0.6m (toward IBS)

Run 125 : Pin imaging                                

We adjust CRL4b position with detm20 = 53.568 mm trying to optimize imaging of the siemens star.

Run 126 : Siemens star imaging
                           inner structure of the seimens star are more difficult to see. (air scattering?)

Run127 :  Imaging of the Pin with adjusted position found for the siemens star
Run128 :  Free beam imaging (in case we can remove the imperfections)

Quick and dirty normalisation of the Siemens start radiograph (run 127) using the reference from run 128 shows a well defined Siemens star down to 1um (cf. att-3).
Features from the inner ring can be observed. A more refined work on the data postprocessing would probably help to unveil part of those structures.
The overall transmission (modulated with the optics hutch attenuators) is about 1%

Clearly, downstream focusing of the X-rays give better imaging results (as expected due to lower Fresnel number) compared to upstream focusing which is heavily impacted by diffraction.

The bad halo in the center of the FOV was due to some defects on the edge of the beam / lenses.
By adjusting the power slits, we could somehow clean things. (cf. att-4)
The parameters of the power slits can be found in att-5.

17 Feb 2023, 20:46 Timing with the laser found.
17 Feb 2023, 20:46 : X-ray transmission set at 1.5% (optics hutch attenuators.)

Run 129 : Siemens star imaging with cleaned beam.
Run 130: Pin Imaging with clean X-rays
Run 131: Reference for the background

After same tricks as earlier, (normalizing siemens star by a background from free beam acquisition), we end up with a nice picture cf. att-6. We are happy!

17 Feb 2023, 21:30 : RAM ion detector for radioprotection has been placed on ladder close to IC1. Be careful around IC1, don't bump the ladder!!!
17 Feb 2023, 21:31 : Chains have been wrapped around IC1. Only people having the training for radiation protection from Erik can remove them.

17 Feb 2023, 21:32 : The macro for the energy calibration of RELAX can't be found

17 Feb 2023, 21:41  FSI shutter macro is configured for :
                                           - 180 mm is open
                                           -     0 mm is closed
                                           - By turning off the motors, you loose the micro steps, make sure the hole of the FSI shutter keeps centered with cold shot

ILM shutter for focus diagnostic is open at -60 mm and closed at 0 mm.
The shutter position needs to be checked roughly with MECHCAM-2 'FSE'

Reproducibility needs to be checked. Be aware if you drive the shutter in the limits and switch of the motor the shutter flies around ( no gear). 1mm = 1 deg

17 Feb 2023, 21:56 :
Run 132 : cold shot
 

A2 - G3

17 Feb 2023, 22:50 : X-rays seem not to be triggered!!! It is impossible to capture a driven shot!!!
                                 Opening and closing of ppu seems to be random!!!!
                            It seems that PPU needs to always be on a known state before shot procedure, else it doesn't work!!!!!
                             

The Zyla 5 camera (optic peter) has a high drop rate of frames (cf. att-7). This needs to be fixed so that we have a chance to get radiographs.
It also seems that image rotation of 0 degree is correlated to bad unreadable aquisitions.
It needs to be investigated.

2 color mode

Achievements

• Fluence scan
• delay scan to identify cross talk of two colors
• Optimized beam size

Problems

• Struggle to find the expected signal when scanning color 2 energy
  • Optimized conditions

Plan for the rest of the night

• Repeat energy scan with optimized conditions
• Maybe try at a different delay

X-ray delivery

• 9.3 keV, 1-120 pulses

Optical laser delivery

• No Optical Laser

Achievements/Observations

• EHC Shimadzu timing and focusing
• Two-Plane Measurements Tested
• SA1, NKB and EHC Shimadzu flatfields recorded
• Coherence measurement with EHC Shimadzu

Issues

• Bassler cameras misbehaving

Staff: KK, RB, TG, AS, CK

X-ray delivery

• 9.3 keV, 1-120 pulses,

Optical laser delivery

• No Optical Laser

Achievements/Observations

• EHC Shimadzu timing and focussing
• Two-Plane Measurements Tested
• SA1, NKB and EHC Shimadzu flatfields recorded
• Y - Double Slit diffraction pattern recorded on EHC Shimadzu

Issues

• Bassler cameras misbehaving

Instrument status

• AGIPD HV off.
• AGIPD gate valve closed and pinned.
• Attenuators set to thickest diamond.
• Vacuum valves closed.
• EHC and NKB Shimadzus focussed and timed
• Sample in out-of-beam position

To do for next shift

• EHC Shimadzu Measurement of Y-Double Slit Pattern - both shimadzus currently focussed w/ respect to YAG screens and EHC and have correct timing.
• I0 Monitor comissioning.

Data for the Horizontal jitter at the HED Pop-In was observed during beam delivery on cw05 (03-05.Feb) and cw07 (14-16.Feb) (see attached pictures). 

We have a similar base jitter in both periods of beam delivery to HED, ranging from a minimum of 50-60um to around 80-100um in both operational weeks.

Shift summary 15.2.2023 (Wednesday)

X-ray delivery

• 9.3 keV, 1-200 pulses, 1.0 mJ, pulse energy fluctuation due to SA3 tunning & special operation mode (SCS)

Optical laser delivery

• No Laser

Achievements/Observations

• LPM and Calorimeter commissioning (efficiency of MKB system and CRL lens stacks checked)
• Recorded Micron Ptychography w/ Zyla Camera
• Install EHC Shimadzu
• Both Shimadzus train synchronised and recording properly to DAQ

Issues

• 10-15% pulse energy fluctuation due to SA3
• Zyla Failure
• Poor scattering efficiency on Zyla

Achievememts:

1. optimised the beam rep rate to value of 140KHz for a better signal 
2. changed nozzles and refilled the reservoir
3. Improved notebook for data analysis
4. Cammille made an online tool to see correlations between Viking and XGM --> very useful!

Night shift:

1. repeating measurements with one color with the new settings
2. following for the 2 colors plan

Achievements

• Located flat jet and attempted measurement of XAS at several incident energies 1300, 1305, 1315 eV

Problems

•  We have difficulty locating the beam on the sample
  • We have not found a signal on eith of the diodes in the Chem chamber.
  • Knife edges with the viking are daoable but require more extended analysis
• Jet froze due to a leakage from the side of the chip. The ice crusher has been avoided to solve
• The filter in the hRIXS was broken and had to be relplaced.

Achievements

• Two color mode established with 11.5 GeV, 1.335 keV col1, 1.27 keV col2
• Beam size characterized using Viking + online tool
• Jet found by scanning and looking at transmitted signal on Viking

Problems

• Issue with train Id of Chem motors --> fixed by setting proper trigger
• Beam loss around 19:30 induced instability in the two color mode, slow degradation of intensity and stability until 23:00 when it was not possible to use the beam
  • Called PRC, decided to tune to single color, 1.3 keV for the night
• Jet froze

SA3 SCS exit slit: the upper blade was detached from the motor and fall into closed position. Maurizio V. and F. Wolff-Fabris tried to move it out of the beam by placing spacers to hold the blade up.

Bottom blade was moved down with the motors. Currently both motors are disconnected.

*** Update 14.02 10AM:

This morning the exit slit was clipping the beam. Another ZZ by M. Dommach, M. Petrich and F. Wolff-Fabris was done to move up the top blade by a further 8mm. 

After that intervention SCS confirmed to see the beam at the Pop-in and at the experimental hutch.

X-ray delivery

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

Optical laser delivery

• 800 nm, 1-226 pulses, stable delivery
• ns laser for illumination

Achievements/Observations

• Successfull arrival time slope setting
• Pump-probe data collection at IRU with corrected time slope

Issues

• No major issues

X-ray delivery

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

Optical laser delivery

• 800 nm, 1-226 pulses, stable delivery
• ns laser for illumination

Achievements/Observations

• Successfull arrival time slope setting
• Pump-probe data collection at IRU with corrected time slope