Absolute Beam Energy

Summary of Beam Properties in JLab Injector

Beam Kinetic Energy, T (MeV)	3.0 – 7.75
Beam Current (µA)	0.01 – 100
Absolute Beam Energy	0.36%
Relative Beam Energy	0.1%
Energy Resolution (Spread), σT /T	0.06%
Beam Size, σx,y (mm)	1 – 2

Goals:
 - Increase beam kinetic energy to 8.5 MeV.
 - Reduce the uncertainty on the absolute beam energy to <0.1% and achieve a relative beam energy of <0.02%.

Mott Results

• J. Grames, "Mott Experiment Run I/II Beam Energies" JLAB-TN-17-001 (Jan 17, 2017) media:JLAB-TN-17-001.docx media:JLAB-TN-17-001.pdf

Dipole Field

• MDL0L02 Dipole and Environmental Fields, August 16, 2016: media:MDL_Environmental_Fields.pdf media:MDL_Environmental_Fields.pptx
• MDL0L02 Dipole Hysteresis Loop Study, September 20, 2016: media:MDL_HysLoopMap.pdf media:MDL_HysLoopMap.pptx
• New Field Map: media:FinalNewMDL0L02_fm.txt

New Dipole Magnet

1. Magnet Design: media:new_5MeV_dipole.pdf media:new_5MeV_dipole.doc
2. Magnet Drawings (change txt to tar): media:05-06-14_ISSUED_DL_MAG_DRAWINGS.txt
3. A detailed examination of the MDL field map and the TOSCA model of this "5 MeV" dipole

Jay Benesch (JLab Tech note 15-017, September 9, 2015): media:TN-15-017_MDL_FieldMap.pdf media:Graphs_MDL.pdf media:Graphs_MDL.docx

New Hall Probe

1. GMW DTM-151-PS Digital Teslameter, 20 Bit Resolution, RS-232 Interface, Panel Mtg media:G3_MAN_DTM-151-S.pdf
2. GMW MPT-231-8s Miniature Hall Probe with thermal sensor, High Sensitivity 0.03T, 0.06T, 0.12T, & 0.3T, 8m shielded cable. 0.01% accuracy, resolution to 2 ppm, and a temperature stability of 10 ppm/°C.

PEPPo Results

Momentum Measurement:

• Joe's summary of beam momentum: Media:130724_Bubble_Grames.pdf
• Joe's presentation at PEPPo Collaboration Meeting: Media:Collab_Momentum_Grames.pdf
• Joe's followup: Media:130718_FollowUp_Momentum_Grames.pdf
• Joe's followup: BPM quad centering Media:130726_MomentumFollowUp2_Grames.pdf

Cryounit Gradient:

• Upper limit of the electron beam energy at the CEBAF 2D injector spectrometer and its functionality

Jonathan Dumas, Joe Grames, and Eric Voutier Media:JLAB-TN-08-086.pdf