Booster Yan: Beam Conditions and Emittance Measurement
"Discover the beam conditions and emittance measurements of Booster Yan on October 28, 2021. Explore the characterization of booster components, beam energy variations, and emittance comparisons in keV and MeV regions."
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Presentation Transcript
Characterization of Booster Yan October 28, 2021
Beam Conditions Gun HV: 180 KV Chopper: off Buncher: on & at negative zero crossing Booster: on crest & beam centered Beam momentum: 6.3 MeV/c All solenoids: beam centered & cycled All quads: beam centered, zero field & cycled
Beam Energy vs. 2-Cell Cavity Gradient 1 Beam Momentum (MeV/c) 0.8 0.6 0.4 0.2 0 0 0.5 1 1.5 2 2.5 3 3.5 2-Cell Gset (MV/m) with 7-Cell Off
Beam Energy vs. 7-Cell Cavity Gradient 10 9 Beam Momentum (MeV/c) 8 7 6 5 4 3 2 1 0 0 2 4 6 8 10 12 7-Cell Gset (MV/m) with 2-Cell On
Emittance Measurement in KeV Region Scan MQZK203 and measure beam size at ITVK203A KeV Region Emittance n x 8.8 +/- 0.4 E-9 7.9 +/- 0.3 E-9 y 28.6 +/- 0.8 E-9 26.0 +/- 0.7 E-9
Emittance Measurement in KeV Region Scan MQZK203 and measure beam size at ITVK203A Y Plane X Plane 3.00E-06 6.00E-07 2.50E-06 2.00E-06 4.00E-07 2(m2) 2(m2) 1.50E-06 1.00E-06 2.00E-07 5.00E-07 0.00E+00 0.00E+00 -650 -550 -450 -350 -250 -150 -350 -150 50 250 k (m-2) k (m-2)
Emittance Measurement in MeV Region Scan MQJM501 and measure beam size at ITVM603 MeV Region Emittance n x 0.7 +/- 0.2 E-9 8.3 +/- 1.9 E-9 y 1.6 +/- 0.2E-9 19.3 +/- 3.1 E-9
Emittance Measurement in MeV Region Scan MQJM501 and measure beam size at ITVM603 X Plane Y Plane 4.00E-07 5.00E-07 4.00E-07 3.00E-07 2(m2) 2(m2) 3.00E-07 2.00E-07 2.00E-07 1.00E-07 1.00E-07 5 15 25 35 -35 -25 -15 -5 k (m-2) k (m-2)
Emittance Comparison Emittance Plane n KeV x 8.8 +/- 0.4 E-9 7.9 +/- 0.3 E-9 Region y 28.6 +/- 0.8 E-9 26.0 +/- 0.7 E-9 MeV x 0.7 +/- 0.2 E-9 8.3 +/- 1.9 E-9 Region y 1.6 +/- 0.2 E-9 19.3 +/- 3.1 E-9
Beam Deflection by Booster ITVM201 Booster d Deflection angle = ATAN(d/L) L Booster x y (deg) 0.096 +/- 0.008 -0.025 +/- 0.001
x/y Coupling Move beam on a viewer horizontally or vertically Measure the beam position changes in both planes Calculate beam rotation
x/y Coupling - Background Move beam horizontally/vertically using MLHK403H/V on ITVM201 with Booster off Background x y Rotation (deg) 2.71 +/- 0.27 0.19 +/- 0.02
x/y Coupling Caused by Booster Move beam horizontally/vertically using MLHK403H/V on ITVM201 with Booster on Booster x y Rotation (deg) 0.55 +/- 0.29 0.88 +/- 0.06
Energy Spread Measurement ITVM703/803 ITVM603 Booster MDLM504/601 Spectrometer Dipole MDLM504/601 does not focus beam in the bending plane
Energy Spread Measurement All quads are beam centered, zero field, and cycled Measure beam sizes at ITVM401, 603, 703, and 803 Calculate beam sizes at ITVM70/803 using that at ITVM401/603 Beam size change ? = 22 12 Deflection angle change ?? =? ? ??? = ??? = ? ? + ?? ? ?? = ??? + ?(??? ??? ????) ?? ?= ??/?= ?? ?
Energy Spread Measurement Phase Buncher ITVM703 5.2 +/- 0.1 E-4 3.9 +/- 0.1 E-4 12.9 +/- 0.2 E-4 13.2 +/- 0.9 E-4 5.2 +/- 0.2 E-4 4.5 +/- 0.5 E-4 7.9 +/- 0.2 E-4 4.9 +/- 0.3 E-4 4.4 +/- 0.3 E-4 4.9 +/- 0.3 E-4 7.1 +/- 0.2 E-4 5.2 +/- 0.1 E-4 6.5 +/- 0.4 E-4 9.1 +/- 0.3 E-4 8.2 +/- 0.2 E-4 8.7 +/- 0.3 E-4 7-Cell ITVM703 Change (deg) -10 -5 0 5 10 ITVM803 ITVM803 8.3 +/- 0.7 E-4 4.4 +/- 0.3 E-4 4.9 +/- 0.3 E-4 6.3 +/- 0.2 E-4
Energy Spread Measurement 1.50E-03 buncher-703 buncher-803 1.30E-03 7-cell-703 7-cell-803 Energy spread (dp/p) 1.10E-03 9.00E-04 7.00E-04 5.00E-04 3.00E-04 -10 -8 -6 -4 -2 0 2 4 6 8 10 Buncher / 7-cell Cavity Phase Offset (deg)
Beam Stability Beam motion on spectrometer viewer is minimum. Sometimes when the environment is noisy we may see some beam jitter. High current beam was not allowed for safety reasons
