Performance Metrics: User Time for FY22

Experiment: E331 - Neural network based tuning to exploit machine-wide sensitivities in pursuit of high beam quality

Shift Start: 2022-08-21 02:00:00

​ Brief Summary:

We successfully ran Bayesian Optimization on sextupole movers to optimize beam size near the IP.
 This is a first step toward more comprehensive automated tuning of Sector 20. 
During this we also recorded data for the longitudinal phase space with the TCAV and other measurements that will be 
useful for examining correlations in the accelerator and helping to improve agreement between simulations and measurements.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-08-20 17:30:00

​ Brief Summary:

A complete dataset was taken to identify the transition of beam-plasma interaction from plasma-lensing to pwfa to filamentation regime.

Experiment: E332 - Near-field-CTR-based self-focusing in beam-multifoil collisions: towards soliddensity beams, extremely
-dense gamma-ray pulses and laserless SFQED

Shift Start: 2022-08-20 14:45:10

​ Brief Summary:

The beam was focused to the smallest size on the solid targets and we saw faster burn through of the targets
, indicating the beam intensity was in fact decreased. Data was acquired to search for a focusing effect under these conditions.

Experiment: E320 - Probing Strong-field QED at FACET-II

Shift Start: 2022-08-19 18:00:00

​ Brief Summary:

Successfully recovered laser alignment and achieved spatio-temporal overlap of the laser pulse and the electron beam. 
Observed consistently linear Compton scattering and saw first indication of higher harmonics. 
Future shifts will aim to improve our understanding to achieve and control the nonlinear Compton 
scattering process more consistently.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-08-18 19:00:00

​ Brief Summary:

We attempted a measurement to identify 3 different regimes of beam-plasma interaction, the plasma lens regime, the PWFA regime and the filamentation regime.
 All preparatory alignment and synchronization tasks worked, but we had to stop because of an accelerator malfunction.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness Energy 
Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-08-17 06:00:06

​ Brief Summary:

Multi-GeV acceleration by PWFA was observed for the first time at FACET-II, and greater than 3 GeV
 was observed from the ~2 meter long beam ionized H2 plasma.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness
 Energy 
Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-08-14 14:00:00

​ Brief Summary:

The E300 program today was to continue to characterize beam ionized hydrogen and optimize deceleration to gauge beam-plasma
 dynamics. 
Beam quality today was sufficient to ionize a hydrogen plasma, but characterization and optimization was challenging. In the effort 
we improved our tools and documentation, which will make the next shift more efficient.

Experiment: E320 - Probing Strong-field QED at FACET-II

Shift Start: 2022-08-13 14:00:00

​ Brief Summary:

E-320 found spatial & temporal overlap between the electron beam and the main laser at the E-320 interaction point, the t0 signal was consistent with 
EOS and other previous measurements. After E-320 switched to high-power laser mode, first electron beam - laser collisions
 were observed, both using gamma and electron diagnostics.

Experiment: E332 - Near-field-CTR-based self-focusing in beam-multifoil collisions: towards soliddensity beams, extremely-dense gamma-ray
 pulses and laserless SFQED

Shift Start: 2022-08-12 18:00:24

​ Brief Summary:

Data was taken for single-shot interaction Nearfield-CTR focusing data and data to assess the physics of beam-induced foil damage.

Experiment: E308 - Extreme Focusing in Vacuum with a Passive Plasma Lens

Shift Start: 2022-08-11 18:00:00

​ Brief Summary:

The axilens focus was optimized on the elongated 2cm gas jet. When beam was delivered, the plasma was overlapped with the e-beam. 
Evidence of plasma lensing was found on DTOTR2 by scanning the spectrometer object plane. 
Scanned backing pressure and took coarse and fine scans of the object plane around the beam focus on DTOTR2.
 TopView images of the laser-ionized plasma with and without beam-ionized afterglow also taken.

Experiment: E308 - Extreme Focusing in Vacuum with a Passive Plasma Lens

Shift Start: 2022-08-10 18:00:00

​ Brief Summary:

After installation of reflective telescope for the ionizer probeline to reduce B-integral by a factor of 10, we still did not see signs of laser-ionization.
 To improve the ionizer further, need to optimize the compressor, probe wavefront, alignment through the telescope,
 stronger focusing lens, or a thinner window on the vacuum chamber.

Experiment: E320 - Probing Strong-field QED at FACET-II

Shift Start: 2022-08-06 18:00:00

​ Brief Summary:

We successfully verified probe/e-beam t0 using the EOS setup. The E-320 focal spot was successfully recovered, we could bring the YAG alignment / timing target into
 the focal plane of the MO diagnostic and could verify main laser / e-beam spatial overlap using two knife-edge scans (horizontal & vertical). 
We couldn't verify the relative timing using the YAG as a timing tool, as the IR filtering isn't suitable right now and we couldn't observe linear Compton
 scattering as the laser intensity (with RP attenuator in) isn't sufficient. All major shift goals were accomplished.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness Energy
 Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-08-04 18:00:52

​ Brief Summary:

We observed consistent beam-ionized plasma glow as well as beam energy loss in plasma on multiple cameras under different
 gas pressures, waist locations, and quad/dipole energies. Plenty of datasets have been taken.

Experiment: E332 - Near-field-CTR-based self-focusing in beam-multifoil collisions: towards soliddensity beams, extremely-dense gamma-ray 
pulses and laserless SFQED

Shift Start: 2022-08-03 18:32:15

​ Brief Summary:

Data was collected for different bunch length compression settings to identify a potential focusing effect from near 
field coherent transition radiation when the beam enters an aluminum foil.

Experiment: E320 - Probing Strong-field QED at FACET-II

Shift Start: 2022-08-02 18:00:59

​ Brief Summary:

Managed to recover laser alignment onto diagnostics and insert alignment target after fixing motorisation during a guarded access last week. 
Observed e-beam signal on alignment target and achieved some spatial overlap of e-beam and laser. Did not observe signs of temporal overlap yet.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-08-01 18:00:00

​ Brief Summary:

Beam-based high-precision measurements of the laser-procuded plasma and of the afterglow signal were recorded.

Experiment: E336 - Feasibility studies of the FACET-II beam interaction with CNT materials 

Shift Start: 2022-08-01 01:30:00

​ Brief Summary:

The beam was sent into a lead glass nanotarget. A small damage was observed and characterized,
 although the nanotarget is much more resistant than aluminum.

Experiment: E332 - Near-field-CTR-based self-focusing in beam-multifoil collisions: towards soliddensity beams, extremely-dense gamma-ray 
pulses and laserless SFQED

Shift Start: 2022-07-31 18:00:00

​ Brief Summary:

We showed that the beam damage in Al foils is very sensitive to bunch compression, and demonstrated the possibility to recover optimum compression 
during the shift by maximizing the drilling speed. At 10 Hz and optimum compression, the beam completely drills through Al 0.1mm in 3 minutes.

Experiment: E325 - Automatic tuning for high gain low energy spread and low variance PWFA

Shift Start: 2022-07-30 15:00:06

​ Brief Summary:

We took many datasets. We discovered a correlation between beam energy and arrival time on EOS. 
We will analyze the data to uncover the source of the correlation.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness 
Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-07-29 20:15:00

​ Brief Summary:

Electron energy spectra were acquired to compare with known energy losses to commission the main spectrometer screens 
and data for emittance measurements was acquired to be analyzed offline.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-07-27 21:00:00

​ Brief Summary:

We studied beam ionization of our hydrogen gas jet at high plasma densities, with the first observation of the beam
 ionized plasma on the shadowgraphy diagnostic.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness Energy
 Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-07-27 17:00:00

​ Brief Summary:

A static fill of helium was achieved with differential pumping active in the IP area for the first time (5 Torr). The beam created a plasma and the
 beam-plasma interaction was characterised. Energy depleted electrons imaged down to <1 GeV (>9 GeV of energy loss).

Experiment: E320 - Probing Strong-field QED at FACET-II

Shift Start: 2022-07-26 17:00:08

​ Brief Summary:

Managed to recover laser alignment onto the microscope objective cameras following a new alignment procedure. Did not manage to insert
 alignment target into right imaging plane to attempt spatial overlap of laser and electron beam. Access to the setup will be required to proceed.

Experiment: E332 - Near-field-CTR-based self-focusing in beam-multifoil collisions: towards soliddensity beams, 
extremely-dense gamma-ray pulses and laserless SFQED

Shift Start: 2022-07-25 18:00:00

​ Brief Summary:

Successfully validated data acquisition tools to characterize the beam coming out of the solid targets. 
Scans were carried out to retrieve beam parameters downstream of the targets.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-07-24 12:00:00

​ Brief Summary:

The shadowgraphy diagnostic was commissioned in its high-resolution version successfully with ionization front clearly visible on the camera. 
A beam-based technique to characterize the laser-produced plasma was developed, tested and provided a first measurement. 
For the first time the FACET-II electron beam was able to field ionize hydrogen in the absence of laser.

Experiment: E332 - Near-field-CTR-based self-focusing in beam-multifoil collisions: towards soliddensity beams, 
extremely-dense gamma-ray pulses and laserless SFQED

Shift Start: 2022-07-17 18:00:00

​ Brief Summary:

Successfully drilled foils and tested target mover raster scans.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-07-15 18:00:00

​ Brief Summary:

Pressure and waist scans of laser-ionized He gas jet.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a 
High Pump-to-Witness Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-07-14 18:00:00

​ Brief Summary:

We developed quad scan and energy calibration tools that will be critical to future shifts.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-07-12 18:00:00

​ Brief Summary:

Commissioning of diagnostics and procedures for the E305 experiment.

Data of interaction of electron beam with laser-ionized plasma gas in a gas jet was taken. 
High densities were covered with backing pressures of up to 1200 psi.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness
 Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-07-12 12:00:00

​ Brief Summary:

For the TCAV measurements, we have data sets that show timing correlation between EOS and TCAV and data sets that show no timing correlation.
 We are going to use this data to determine if there is S band or X band jitter. 
We also can correlate beam position on DTOTR2 from TCAV deflection to the signal strength on EOS2. 
Took scans of transverse offset of crystal to e-beam to calibrate GaP signal strength.

Experiment: E320 - Probing Strong-field QED at FACET-II

Shift Start: 2022-07-10 15:00:00

​ Brief Summary:

The Experiment 320 tried to recover laser alignment remotely. We were able to successfully transfer the laser to the vacuum beam
 dump and see scintillation light induced by the e-beam on our YAG alignment target.
 We continued to improve the procedure for aligning the laser to the e-beam.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness 
Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-07-08 16:35:41

​ Brief Summary:

We used the TCAV to measure the longitudinal phase space in sector 20 scanning the electron bunch length from under compressed, 
through full compression and into over-compression. These measurements will help determine the TCAV resolution,
 which is important for most of the experimental program.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness 
Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-07-08 16:35:41

​ Brief Summary:

We used the TCAV to measure the longitudinal phase space in sector 20 scanning the electron bunch length from under compressed, 
through full compression and into over-compression. These measurements will help determine the TCAV resolution, 
which is important for most of the experimental program.

Experiment: E308 - Extreme Focusing in Vacuum with a Passive Plasma Lens

Shift Start: 2022-07-07 18:00:00

​ Brief Summary:

We made a few mistakes recovering the alignment, gasjet was at the wrong position. Once we solved that alignment was straight forward.

Tried going to the expected energy for ionization (10 mJ at targer, this is 10x where we expect to ionize). 
When looking at the image of the focus as we increased the energy, the peak intensity went down => B 
integral destroying the focus main suspect.

Shadowgraphy was increasing in energy as expected. so no laser energy problem.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness 
Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-07-06 18:00:00

​ Brief Summary:

EOS timing had shifted from our previous reference. This could be due to a different positon of the EOS removal assembly mover. 
With the ZnTe crystal, we could find by looking for the ringing after-signal when the laser pulse arrived after the e-beam. 
We saw something that could indicate 2 beams, either a laser or electron bunch prepulse. arriving 22 ps earlier than the main beam. 
We also believe we saw a THz reflection in the ZnTe crystal spaced ~ 5 ps after the man signal. To be verified.

Once EOS signal was found, setup behaved as expected. Strong signal difference between the two arms. Should be carefully tuned 
during next PAMM. 
We took jitter and time window data for both ZnTe and GaP. We also overlapped both in time. Tried taking simultaneous data
 at the end by moving the stage so that the e-beam was closer to the GaP crystal.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness Energy
 Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-06-18 16:00:20

​ Brief Summary:

Spectrometer DAQ scan implemented and used to perform emittance and energy spectrum scans.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness 
Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-06-18 16:00:20

​ Brief Summary:

Spectrometer DAQ scan implemented and used to perform emittance and energy spectrum scans.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-06-17 16:00:37

​ Brief Summary:

We successfully found the synchronization of the shadowgraphy diagnostic and observed the laser-induced ionization trace in the large-fov configuration. 
We furthermore scanned the plasma density to study the effect on the electron beam.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness
 Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-06-16 16:00:00

​ Brief Summary:

- We aligned the probeline, went without problems.

- We aligned the Greene (e-beam vector laser) to overlap with the e-beam.

- Checked that we did not hit the crystal with e-beam

- Sent e-beam

- Could directly see EOS effect from bouncing e-fields (?) after the e-beam had passed

- Did a timing scan to see brghtest signal

- Adjusted laser energy

- Redid timing scan, found timing window

- Collected DAQ data

Experiment: E332 - Near-field-CTR-based self-focusing in beam-multifoil collisions: towards soliddensity beams, 
extremely-dense gamma-ray pulses and laserless SFQED

Shift Start: 2022-06-13 18:00:23

​ Brief Summary:

We made progress on the Fast DAQ development for 1Hz and imaged the e-beam on DTOTR and Gamma cameras.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-06-09 16:00:00

​ Brief Summary:

Our goal was to measure laser/e-beam t_0 at the level of 1 picosecond. We did it! 
ttp://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2022/23/10.06&pos=2022-06-10T00:54:14

Experiment: E326 - Non-Intercepting Diagnostics for High Intensity Beams and Computer Control

Shift Start: 2022-06-09 19:00:00

​ Brief Summary:

The goal for this shift was to exercise a new camera that collects synchrotron radiation that encodes the beam size.
 We captured a heap of data that should enable us to make a single shot measurement offline (for now). 
We also continued to explore ways to better overlap two synchrotron light stripes in the dogleg and get to interference.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness
 Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-06-05 18:00:00

​ Brief Summary:

Confirmed the beam vector for tomorrow's PAMM and improved the alignment technique.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness 
Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-06-04 18:00:47

​ Brief Summary:

Tools and procedures were developed for spectrometer diagnostics.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-06-02 22:00:00

​ Brief Summary:

Saw first plasma at FACET II. Timed gas jets and main facet laser. Determined operational range 
for gas-jet given the upstream beryllium window.

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2022-06-01 18:00:00

​ Brief Summary:

Demonstrated the effectiveness of the differential pumping system while operating the gas jets and determined the range of gas jet 
conditions that can be used based on the existing condition of the Be window.

Experiment: E326 - Non-Intercepting Diagnostics for High Intensity Beams and Computer Control

Shift Start: 2022-05-16 18:00:00

​ Brief Summary:

This shift we progressed on developing a quad scan that measured the divergence of a beam by collecting edge radiation. 
We have a lot of data for configurations around the hand tuned optimum of 5 um emittance. 
We can see differences in beam behavior that indicates the method can tell the difference between 5 and 6 um, 
but more analysis is required to automate the process and develop error bars.

Experiment: E331 - Neural network based tuning to exploit machine-wide sensitivities in pursuit of high beam quality

Shift Start: 2022-05-13 18:02:24

​ Brief Summary:

We performed a characterization of the injector emittance at 1.8nC using an efficient sampling algorithm (Bayesian exploration).
 We used multiple methods to optimize the emittance at the injector output and will compare the merits of each.

Experiment: E320 - Probing Strong-field QED at FACET-II

Shift Start: 2022-05-13 21:00:29

​ Brief Summary:

Did not manage to recover alignment sufficiently to accomplish our goals. 
Need to reset setup during an access to enable another attempt for remote alignment and optimisation.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness
 Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-05-13 18:15:00

​ Brief Summary:

We aligned the beam into the picnic basked using references on IPOTR2 after losing the references when pumping down to vacuum. 
We confirmed a good axicon focus on the rail camera and the IPOTR2. We tried to further optimize the axicon focus by adding wavefront
 errors to using the DM but could not improve the focus in this way.

Experiment: E332 - Near-field-CTR-based self-focusing in beam-multifoil collisions: towards soliddensity
 beams, extremely-dense gamma-ray pulses and laserless SFQED

Shift Start: 2022-05-11 18:30:00

​ Brief Summary:

Gained an understanding and experience operating the machine at 1 Hz, and developed the tools 
required for scanning the foil positions to allow a single or multiple shots per "fresh" foil position.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a 
High Pump-to-Witness Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-05-10 18:00:00

​ Brief Summary:

We searched for electron beam/laser overlap on EOS crystal. We learned valuable lessons on how to
 temporally overlap signals on OTR cameras. The beam was intense and drilled holes in OTR foils and Be Windows.

Experiment: E308 - Extreme Focusing in Vacuum with a Passive Plasma Lens

Shift Start: 2022-05-08 16:00:00

​ Brief Summary:

Tested if we could ionize the gas sending more energy into the probeline. Could not see ionization.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a 
High Pump-to-Witness Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-05-07 16:00:00

​ Brief Summary:

Experience was gained on using the spectrometer electron diagnostics 
and first time commissioning of emittance measurement capabilities.

Experiment: E308 - Extreme Focusing in Vacuum with a Passive Plasma Lens

Shift Start: 2022-05-06 16:58:22

​ Brief Summary:

Mapped gas load from the installed D = 5 mm gas jet ranging from 5 psi above atmosphere to 1200 psi. 
Aligned and sent full power laser into the probeline.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness 
Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2022-05-02 16:00:00

​ Brief Summary:

Program this evening was to test out alignment procedures for sending high energy laser into the experimental area without damaging equipment. 
We completed 90% of our alignment scripts successfully and dug up a few issues that can be easily solved.

Experiment: E320 - Probing Strong-field QED at FACET-II

Shift Start: 2022-03-13 13:00:53

​ Brief Summary:

In this laser-only shift, we practiced the fully remote alignment of the laser beam transport and E320 assembly.

Following our alignment procedure, we managed to swiftly recover the focal spot on our diagnostics and then proceed to optimise and characterise it. 
The robustness of our procedures and some additional checkouts we performed on the way demonstrate our increasing readiness 
for full power and e-beam - laser operation.

Experiment: E331 - Neural network based tuning to exploit machine-wide sensitivities in pursuit of high beam quality

Shift Start: 2022-02-27 12:00:09

​ Brief Summary:

We compared optimization methods for the injector emittance and match at the new laser wavelength of 253 nm 
(compared to the previous 266 nm).

Multiple optimization methods were used, overall the minimum emittance we reached was 3.3/3.71 um in x/y compared 
to 5.07/5.83 um in x/y at the same charge with the old laser wavelength of 266nm.

Experiment: E300 - Energy Doubling of Narrow Energy Spread Witness Bunch while Preserving Emittance with a High Pump-to-Witness
 Energy Transfer Efficiency in a Plasma Wakefield Accelerator

Shift Start: 2021-12-17 10:30:00

​ Brief Summary:

We checked out readiness of the E-300 lithium oven to support upcoming PWFA experiments. 
A lithium vapor column of ~4e16/cm3 was formed. Oven is ready for experiments.

Experiment: E327 - Virtual diagnostic for phase space prediction and customization at FACET-II

Shift Start: 2021-12-17 08:13:08

​ Brief Summary:

We took the first compression data for the LPS virtual diagnostic. Model to be trained soon! We continued comparing injector emittance
 and match optimization. We tested speed and accuracy of different methods (see above 'progress' for results).

Experiment: E305 - Beam filamentation and bright gamma-ray bursts

Shift Start: 2021-12-14 16:00:00

​ Brief Summary:

The new high resolution camera, DTOTR1, was successfully checked out and E305 image data acquired.

Experiment: E331 - Neural network based tuning to exploit machine-wide sensitivities in pursuit of high beam quality

Shift Start: 2021-12-11 12:25:30

​ Brief Summary:

Ran Bayesian exploration for characterization of the injector, along with a high-dimensional optimization 
of the matching quads, solenoid, bucking coil, and corrector quads. 
The targets were the match and emittance. The gathered data will be used for model construction 
(which in turn will be used to speed up more heavily model-based tuning algorithms).

Experiment: E331 - Neural network based tuning to exploit machine-wide sensitivities in pursuit of high beam quality

Shift Start: 2021-12-04 08:00:16

​ Brief Summary:

We continued characterizing the injector emittance and used ML models to optimize both the emittance and match at the injector exit. 
We tested an efficient sampling algorithm (Bayesian exploration) which will allow us to quickly 
characterize multi-dimensional behavior in the accelerator in the future without doing ND scans.

Experiment: E325 - Automatic tuning for high gain low energy spread and low variance PWFA

Shift Start: 2021-12-02 20:00:00

​ Brief Summary:

We accumulated tens of thousands of shots of data on multiple profile monitors throughout the machine. 
This data will be analyzed, compared to simulation, and used to train NN models.

Experiment: E327 - Virtual diagnostic for phase space prediction and customization at FACET-II

Shift Start: 2021-11-28 12:00:00

​ Brief Summary:

Successful testing of Bayesian methods for efficient characterization and 
optimization of the FACET-II injector emittance.

Experiment: E327 - Virtual diagnostic for phase space prediction and customization at FACET-II

Shift Start: 2021-11-20 08:12:21

​ Brief Summary:

Successfully tested gathering training data for ML based prediction and optimization of injector emittance. 
Tested automatic data acquisition triggering the DAQ from an external script. 
This in principle can be adapted for a number of different measurements for different FACET experiments.

Experiment: E327 - Virtual diagnostic for phase space prediction and customization at FACET-II

Shift Start: 2021-11-17 17:44:57

​ Brief Summary:

Tested software necessary to robustly run and save quadrupole scan emittance measurements while simultaneously recording multiple 
device measurements from the machine. These measurements will form the backbone of a large parameter scan which will be
 used to understand injector emittance variations. This scan this data will serve as input to train a machine learning model to 
predict and optimize the injector emittance.