Summary of Completed Shifts

Shift No.Shift NameDateProcedureE-logNotes
E301-01Initial Ionization Test

 

ProcedureelogInitial attempt to ionize H2 with the 0.7deg axicon. No signs of ionization, significant amounts of spatial chirp visible in the axicon focus.
E301-03Ionization Test 2

 

ProcedureelogAfterglow visible in Ar, but not H2. 
E301-04Raster Scan

 

ProcedureelogEven in pencil beam configuration, electron beam was ionizing Ar. Took a raster scan with the 0.7deg axicon
E301-05Laser Checkout and Axicon Characterization

 

ProcedureelogRail camera scans of the axicon focus and plasma formation in 5 Torr Ar
E301-06Raster Scan

 

ProcedureelogFound strong evidence for B-integral. Raster scans in Ar at 5, 4, and 2 Torr. Effect on e-beam was small.
E301-07H2 Raster Scan

 

ProcedureelogAfterglow 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.
E301-08Plasma Length Characterization

 

ProcedureelogSpectrometer object plane scans. Strong effect of the plasma on the e-beam. Waist scans lead to beam ionization of H2.
E301-09Tandem Lens Characterization

 

ProcedureelogRail camera scans of the tandem lens focus and plasma formation in 1.35 Torr H2
E301-10Optimize the PWFA

 

ProcedureelogOptimized 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.
E301-11Plasma Source and Misalignment Study

 

ProcedureelogPWFA optimization followed by scans of laser energy and pointing. Preliminary E333 shift
E301-12Alignment Automation

 

ProcedureelogTested the afterglow based laser to e-beam alignment tool. Works well for fine alignment if there is no beam ionization.
E301-13Optimize the PWFA

 

ProcedureelogOptimized 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.
E301-14Plasma Guiding in Hydrogen

 

ProcedureelogE333 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.
E301-13Optimize the PWFA

 

ProcedureelogOriginally 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.
E301-14Plasma Guiding in Hydrogen

 

ProcedureelogE333 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.
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