Difference between revisions of "Table of 12 GeV Beam Energy Measurements"

Revision as of 05:57, 11 July 2019

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

@@ Line 1: / Line 1: @@
 * 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. [https://logbooks.jlab.org/entry/3682639 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. [https://logbooks.jlab.org/entry/3696646  Elog entry] summarizes the work
+to get the power supplies to cycle to 494 amps. [https://logbooks.jlab.org/entry/3696467 Elog entry] by Jay about the cycling to 400 amps.
 {|border="1" align="center"
@@ Line 23: / Line 25: @@
 ! 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
+! **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
 |}