Cooler e-source Magnetized Beam LDRD Progress Report

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Presentation transcript:

Cooler e-source Magnetized Beam LDRD Progress Report June 1, 2017

Magnetized Electron Source at GTS Gun HV Chamber Photocathode Preparation Chamber Beamline Gun Solenoid Slit Viewer Screen Shield Tube Viewer 3 Screen Beam Dump

Measuring Beam Magnetization Use slit and viewscreens to measure mechanical angular momentum: 𝐵 𝑧 : solenoid field at photocathode 𝑎 0 : laser rms size Φ: rotation (sheering) angle

0 G at photocathode 1088 G at photocathode

Magnetized Beam Sizes Solenoid Current (A) Field (G) σ1 (mm) σ2 (mm) 1.66 2.18 4.84 25 91 0.35 0.44 0.71 50 181 1.39 2.10 4.09 75 272 1.82 0.67 1.46 100 363 4.36 1.43 2.40 150 544 0.49 1.02 200 725 0.46 0.95 4.22 250 907 1.08 2.02 6.54 300 1088 1.88 3.28 7.11 All beamline solenoids are off. Laser rms = 0.25 mm

Magnetized Beam Rotation Angles Solenoid Current (A) Field (G) ɸ2 (deg) ɸ3 (deg) ɸ2- ɸ3 (deg) 25 91 3.6 18.9 15.3 50 181 -1.7 -5.7 -4.0 75 272 5.8 11.7 5.9 100 363 -3.6 -7.5 -3.9 150 544 -78.1 -54.1 24.0 200 725 5.7 8.8 3.1 250 907 -4.1 -8.5 -4.4 300 1088 -7.6 -18.8 -11.2

High Current Magnetized Beam Delivered 0.5 mA Plan for 5 mA by end of summer

Summary of Progress Submitted LDRD proposal for 3rd year funding Delivered 0.5 mA magnetized beam with 1450 G on photocathode Measured beam sizes and rotations with magnetic fields up to 1088 G on photocathode Filed patent disclosure entitled “Non-invasive RF Cavity to Measure Beam Magnetization”

Outlook: June – September Measure beam sizes and rotations with magnetic fields up to 1450 G on photocathode Simulation of magnetized beam sizes and rotation angles Run 5 mA magnetized beam Build and install a TE011 cavity at GTS to measure beam magnetization in collaboration with Brock and SRF Institute