1. 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

2. 15 deg dipole TE  pBL [MeV] [MeV/c][G-cm] ORIGINAL0.1000.6111.1960.335291.476 CEBAF0.1300.6411.2540.387336.747 0.1500.6611.2940.419364.851 0.2000.7111.3910.494430.186 0.2500.7611.4890.564490.704 0.3000.8111.5870.630548.002 ITCU0.3500.8611.6850.693603.000 0.4000.9111.7830.754656.275 MAX HVPS0.4500.9611.8810.814708.217

3. DS Y-Chamber Bend Magnet First Design (DS001?) Spare (DS002?) CEBAF (DS003) Test Cave (DS004) IDMappedBL [G-cm] @ 2.5A DS001Feb 1999373.63 DS002Feb 1999338.34 DS003Sep 1999359.90 DS004Sep 2002364.89 32709-C-0358 “DS” magnet is cosine-theta design to provide uniform current density (pure dipole field) from windings (no iron).

4. AWG16AWG18 As-foundSketchMeasured Diameter0.0508"0.0403" Area1.31 mm 2 0.823 mm 2 Ampacity10 Amp7 Amp TE  pBLPS Current Density Current Density [MeV] [MeV/c][G-cm][A][A/mm 2 ] ORIGINAL0.1000.6111.1960.335291.4762.0241.5452.459 CEBAF0.1300.6411.2540.387336.7472.3391.7852.841 Tested0.1500.6611.2940.419364.8512.5341.9343.079 0.2000.7111.3910.494430.1862.9872.2803.630 0.2500.7611.4890.564490.7043.4082.6014.141 0.3000.8111.5870.630548.0023.8062.9054.624 ITCU0.3500.8611.6850.693603.0004.1873.1975.088 0.4000.9111.7830.754656.2754.5573.4795.538 MAX HVPS0.4500.9611.8810.814708.2174.9183.7545.976 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

5. Solenoids Focal length half of solenoid spacing (=1.5m): Spin rotation can be chosen independently: g = 2.002319304361(53) TE  pf=0.5mf=0.75m [MeV] [MeV/c][G2-m] ORIGINAL0.1000.6111.1960.335998.729665.820 CEBAF0.1300.6411.2540.3871333.063888.709 0.1500.6611.2940.4191564.8541043.236 0.2000.7111.3910.4942175.4861450.324 0.2500.7611.4890.5642830.6241887.082 0.3000.8111.5870.6303530.2692353.512 UITC0.3500.8611.6850.6934274.4202849.614 0.4000.9111.7830.7545063.0793375.386 MAX HVPS0.4500.9611.8810.8145896.2443930.829

6. Single Coil = Single Wound = SW

7. 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

8. FHFBFAFQ FHFBFAFQ TE  pF=0.5m861.780998.8201111.0301342.440F=0.75m861.780998.8201111.0301342.440 [MeV] [MeV/c][G2-m][A] [G2-m][A] ORIGINAL0.1000.6111.1960.335998.7291.0771.0000.9480.863665.8200.8790.8160.7740.704 CEBAF0.1300.6411.2540.3871333.0631.2441.1551.0950.997888.7091.0160.9430.8940.814 0.1500.6611.2940.4191564.8541.3481.2521.1871.0801043.2361.1001.0220.9690.882 0.2000.7111.3910.4942175.4861.5891.4761.3991.2731450.3241.2971.2051.1431.039 0.2500.7611.4890.5642830.6241.8121.6831.5961.4521887.0821.4801.3751.3031.186 0.3000.8111.5870.6303530.2692.0241.8801.7831.6222353.5121.6531.5351.4551.324 UITC0.3500.8611.6850.6934274.4202.2272.0691.9611.7842849.6141.8181.6891.6021.457 0.4000.9111.7830.7545063.0792.4242.2512.1351.9423375.3861.9791.8381.7431.586 MAX HVPS0.4500.9611.8810.8145896.2442.6162.4302.3042.0963930.8292.1361.9841.8811.711 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.

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

10. Operational Values  Build 3 rd Wien filter like the others provides 30-40 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.

11. 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] 0.1000.6111.1960.335671.501 CEBAF0.1300.6411.2540.387775.797 0.1500.6611.2940.419840.542 0.2000.7111.3910.494991.062 0.2500.7611.4890.5641130.482 0.3000.8111.5870.6301262.486 ITCU0.3500.8611.6850.6931389.189 0.4000.9111.7830.7541511.924 MAX HVPS0.4500.9611.8810.8141631.588  We need a iron core dipole which provides 1700 G-cm  “Red” dipoles provide e.g. >4000 G-cm/A

12. 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 30-40 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