Table of 12 GeV Beam Energy Measurements

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  • The MCC Hall C energy measurement tool was updated on May 16th 2019 to fix a problem that caused it to give the wrong beam energy. See elog. The logbook links, before May 16th 2019, will show the results of beam energy when there was a problem in the code. The correct beam energies in the table are and they were calculated using a separate code using the dipole string current listed in table.
  • Synchrotron radiation is calculated for the full 34.3 deg bend of the Hall C dipole arc.
  • June 20th 2019 , beam energy measurement the arcdipole magnets were only cycled to 270 amps. Normal cycle is to 494 amps. Elog entry summarizes the work

to get the power supplies to cycle to 494 amps. Elog entry by Jay about the cycling to 400 amps.

Date Logbook entry Current Beam energy Sync rad Hallc:p 1-(Beam Energy)/Hallc:p
Dec 12 2017 https://logbooks.jlab.org/entry/3503087 92.345 2.22178 +/- 0.00236 2214.36 0.0033
Jan 18 2018 https://logbooks.jlab.org/entry/3516186 268.150 6.42765 +/- 0.00306 0.00035 6404.37 0.0036
April 30 2018 https://logbooks.jlab.org/entry/3569862 443.656 10.60314 +/- 0.00415 0.00265 10597.7 0.0005
Oct 4 2018 https://logbooks.jlab.org/entry/3604084 443.487 10.59915 +/- 0.00415 0.00265 10597.6 0.0001
Dec 4 2018 https://logbooks.jlab.org/entry/3634940 159.6633 3.83345 +/- 0.0026 3821.20 0.0032
Dec 14 2018 https://logbooks.jlab.org/entry/3638789 205.523 4.94090 +/- 0.0028 4917.88 0.0047
March 13 2019 https://logbooks.jlab.org/entry/3667208 417.182 10.21404 +/- 0.00404 10205.4 0.0008
March 22 2019 https://logbooks.jlab.org/entry/3671165 258.207 6.19009 +/- 0.00302 6169.28 0.0034
March 28 2019 https://logbooks.jlab.org/entry/3673353 342.822 8.20883 +/- 0.00349 8184.96 0.0029
**June 20 2019 https://logbooks.jlab.org/entry/3691774 115.821 2.783625 +/- 0.00243 2772.02 0.0041
July 10 2019 https://logbooks.jlab.org/entry/3701511 152.424 3.66017 +/- 0.00256 3649.06 0.0030