Summary of Completed Shifts
Shift No. | Shift Name | Date | Procedure | E-log | Notes |
---|---|---|---|---|---|
E301-01 | Initial Ionization Test |
| Procedure | elog | Initial attempt to ionize H2 with the 0.7deg axicon. No signs of ionization, significant amounts of spatial chirp visible in the axicon focus. |
E301-03 | Ionization Test 2 |
| Procedure | elog | Afterglow visible in Ar, but not H2. |
E301-04 | Raster Scan |
| Procedure | elog | Even in pencil beam configuration, electron beam was ionizing Ar. Took a raster scan with the 0.7deg axicon |
E301-05 | Laser Checkout and Axicon Characterization |
| Procedure | elog | Rail camera scans of the axicon focus and plasma formation in 5 Torr Ar |
E301-06 | Raster Scan |
| Procedure | elog | Found strong evidence for B-integral. Raster scans in Ar at 5, 4, and 2 Torr. Effect on e-beam was small. |
E301-07 | H2 Raster Scan |
| Procedure | elog | Afterglow visible in H2. Removed the Compressor-PB window and observed a change in B-integral. Raster scan at 4.8 and 2 Torr. 1D scans at 1.1 and 0.4 Torr. Effect on e-beam for raster scans due to loosing several klystrons. |
E301-08 | Plasma Length Characterization |
| Procedure | elog | Spectrometer object plane scans. Strong effect of the plasma on the e-beam. Waist scans lead to beam ionization of H2. |
E301-09 | Tandem Lens Characterization |
| Procedure | elog | Rail camera scans of the tandem lens focus and plasma formation in 1.35 Torr H2 |
E301-10 | Optimize the PWFA |
| Procedure | elog | Optimized PWFA interaction by scanning the waist size and position. Energy loss of >7 GeV observed in 1.35 Torr H2. Achieving good spatial overlap key to seeing a strong interaction. 22nd was an attempt at this shift, but the accelerator went down. |
E301-11 | Plasma Source and Misalignment Study |
| Procedure | elog | PWFA optimization followed by scans of laser energy and pointing. Preliminary E333 shift |
E301-12 | Alignment Automation |
| Procedure | elog | Tested the afterglow based laser to e-beam alignment tool. Works well for fine alignment if there is no beam ionization. |
E301-13 | Optimize the PWFA |
| Procedure | elog | Optimized the PWFA by scanning the waist location, ML sextupole tuning, and reduced laser energy. Needed to tune BC14 BLEN setpoint to avoid beam ionization. Demonstrated large energy loss, sextupole tuning was not effective. |
E301-14 | Plasma Guiding in Hydrogen |
| Procedure | elog | E333 shift, saw evidence of guiding that depends on laser energy in a tilted plasma. Time only permitted the guiding study. E-beam changed halfway through the shift and interaction was weak for the guiding study. |
E301-13 | Optimize the PWFA |
| Procedure | elog | Originally planned to be a E333 shift, but the interaction was strong so we did some optimization instead. Tried tuning pressure and waist scans at 25cm beta. Took detailed energy calibrations. |
E301-14 | Plasma Guiding in Hydrogen |
| Procedure | elog | E333 shift continuation of May 12, retook data at the settings with the best signal from the previous shift. Performed object plane and imaging energy scans. |