Can we re-use existing magnets to build a 350(450) keV beam line? No.Type 115 deg dipole 1Spectrometer dipole 1NEG solenoid (2.5” ID) 5SW/CW solenoid 1Wien filter

15 deg dipole TE  pBL [MeV] [MeV/c][G-cm] ORIGINAL CEBAF ITCU MAX HVPS

DS Y-Chamber Bend Magnet First Design (DS001?) Spare (DS002?) CEBAF (DS003) Test Cave (DS004) IDMappedBL 2.5A DS001Feb DS002Feb DS003Sep DS004Sep C-0358 “DS” magnet is cosine-theta design to provide uniform current density (pure dipole field) from windings (no iron).

AWG16AWG18 As-foundSketchMeasured Diameter0.0508"0.0403" Area1.31 mm mm 2 Ampacity10 Amp7 Amp TE  pBLPS Current Density Current Density [MeV] [MeV/c][G-cm][A][A/mm 2 ] ORIGINAL CEBAF Tested ITCU MAX HVPS DS Operational Values Ampacity = Current wire can reasonably carry Cooling = Rule of Jay, 5 A/mm 2 (but, might be too warm near gun)  DS002: Test temperature and voltage to 6A  DS005: Propose new set of windings using AWG16 on DS001 fixture

Solenoids Focal length half of solenoid spacing (=1.5m): Spin rotation can be chosen independently: g = (53) TE  pf=0.5mf=0.75m [MeV] [MeV/c][G2-m] ORIGINAL CEBAF UITC MAX HVPS

Single Coil = Single Wound = SW

Two Coils = Counter Wound = CW Found spare FD (chopping aperture) coils and what looks to be another FA for chopping cavity (red) Note: Only enough shells to build 5 solenoids

FHFBFAFQ FHFBFAFQ TE  pF=0.5m F=0.75m [MeV] [MeV/c][G2-m][A] [G2-m][A] ORIGINAL CEBAF UITC MAX HVPS Solenoid Operational Values  FH: Should work at 3A. Test for saturation. Pick new limit. Remap.  FB: Should work fine. Work horse magnet.  FA: Have many, but less turns & center plate more likely to saturate  FQ: Have 4, can assemble more. Test/model for saturation. Pick new limit. Remap.

CEBAF Wien Filter Spin precesses about B-field: Lorentz force is zero when:

Operational Values  Build 3 rd Wien filter like the others provides deg of spin rotation  Using 35 deg allows Pz = (0.82-1)P and Px = (0-0.57)P.  Testing for higher B field (temp, saturation) and E field (gradient) possible.

Spectrometer Angle >35 deg Assuming beam width 3mm and spectrometer arm 1m a 35 deg bend achieves 0.5% momentum resolution TE  pBL [MeV] [MeV/c][G-cm] CEBAF ITCU MAX HVPS  We need a iron core dipole which provides 1700 G-cm  “Red” dipoles provide e.g. >4000 G-cm/A

Summary  FH: Should work at 3A. Test for saturation. Pick new limit. Remap.  FB: Should work fine. Work horse magnet.  FA: Have many, but less turns & center plate more likely to saturate  FQ: Have 4, can assemble more. Test/model for saturation. Pick new limit. Remap.  DS002: Test temperature and voltage up to 5-6A  DS005: Propose new set of windings using AWG16 on DS001 fixture 15 DEG BEND SOLENOIDS WIEN FILTER  Build 3 rd Wien filter like the others provides deg of spin rotation  Assuming 35 deg provides Pz = (0.82-1)P and Px = (0-0.57)P.  Testing for higher B field (temp, saturation) and E field (gradient) possible. SPECTROMETER  We need a iron core dipole which provides 1700 G-cm  “Red” dipoles provide e.g. >4000 G-cm/A