Can we re-use existing magnets to build a 350(450) keV beam line?

Can we re-use existing magnets to build a 350(450) keV beam line?

No. Type

1 15 deg dipole

1 Spectrometer dipole

1 NEG solenoid (2.5” ID)

5 SW/CW solenoid

1 Wien filter

15 deg dipole

T E g p BL [MeV] [MeV] [MeV/c] [G-cm]

ORIGINAL 0.100 0.611 1.196 0.335 291.476CEBAF 0.130 0.641 1.254 0.387 336.747 0.150 0.661 1.294 0.419 364.851 0.200 0.711 1.391 0.494 430.186 0.250 0.761 1.489 0.564 490.704 0.300 0.811 1.587 0.630 548.002ITCU 0.350 0.861 1.685 0.693 603.000 0.400 0.911 1.783 0.754 656.275MAX HVPS 0.450 0.961 1.881 0.814 708.217

DS Y-Chamber Bend Magnet

First Design (DS001?) Spare (DS002?)

CEBAF (DS003) Test Cave (DS004)

ID Mapped BL [G-cm]@ 2.5A

DS001 Feb 1999 373.63

DS002 Feb 1999 338.34

DS003 Sep 1999 359.90

DS004 Sep 2002 364.89

32709-C-0358

“DS” magnet is cosine-theta design to provide uniform current density (pure dipole field) from windings (no iron).

AWG16 AWG18As-found Sketch Measured

Diameter 0.0508" 0.0403" Area 1.31 mm2 0.823 mm2

Ampacity 10 Amp 7 Amp

T E g p BL PSCurrentDensity

CurrentDensity

[MeV] [MeV] [MeV/c] [G-cm] [A] [A/mm2] [A/mm2]ORIGINAL 0.100 0.611 1.196 0.335 291.476 2.024 1.545 2.459CEBAF 0.130 0.641 1.254 0.387 336.747 2.339 1.785 2.841 Tested 0.150 0.661 1.294 0.419 364.851 2.534 1.934 3.079 0.200 0.711 1.391 0.494 430.186 2.987 2.280 3.630 0.250 0.761 1.489 0.564 490.704 3.408 2.601 4.141 0.300 0.811 1.587 0.630 548.002 3.806 2.905 4.624ITCU 0.350 0.861 1.685 0.693 603.000 4.187 3.197 5.088 0.400 0.911 1.783 0.754 656.275 4.557 3.479 5.538MAX HVPS 0.450 0.961 1.881 0.814 708.217 4.918 3.754 5.976

DS Operational Values

Ampacity = Current wire can reasonably carry

Cooling = Rule of Jay, 5 A/mm2 (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 = 2.002319304361(53)

  T E g p f=0.5m f=0.75m [MeV] [MeV] [MeV/c] [G2-m] [G2-m]

ORIGINAL 0.100 0.611 1.196 0.335 998.729 665.820CEBAF 0.130 0.641 1.254 0.387 1333.063 888.709 0.150 0.661 1.294 0.419 1564.854 1043.236 0.200 0.711 1.391 0.494 2175.486 1450.324 0.250 0.761 1.489 0.564 2830.624 1887.082 0.300 0.811 1.587 0.630 3530.269 2353.512UITC 0.350 0.861 1.685 0.693 4274.420 2849.614 0.400 0.911 1.783 0.754 5063.079 3375.386MAX HVPS 0.450 0.961 1.881 0.814 5896.244 3930.829

Single Coil = Single Wound = SW

Type ID(in)

B2L(G2-m)/A

TestedCurrent

Ready Build Parts

FH 2.5 862 2.0 A(742 turns)

1 1 3

FB 2.0 999 3.5 A(742 turns)

6 3 6

Two Coils = Counter Wound = CW

Type ID(inches)

B2L(G2-m)/A

TestedCurrent

Ready Build Parts

FA 1.5 1111 1.5 A(520 turns)

4 2 2

FQ 1.5 1342 2.0 A(573 turns)

4 5 0

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

FH FB FA FQ FH FB FA FQ T E g p F=0.5m 861.780 998.820 1111.030 1342.440 F=0.75m 861.780 998.820 1111.030 1342.440 [MeV] [MeV] [MeV/c] [G2-m] [A] [A] [A] [A] [G2-m] [A] [A] [A] [A]

ORIGINAL 0.100 0.611 1.196 0.335 998.729 1.077 1.000 0.948 0.863 665.820 0.879 0.816 0.774 0.704CEBAF 0.130 0.641 1.254 0.387 1333.063 1.244 1.155 1.095 0.997 888.709 1.016 0.943 0.894 0.814 0.150 0.661 1.294 0.419 1564.854 1.348 1.252 1.187 1.080 1043.236 1.100 1.022 0.969 0.882 0.200 0.711 1.391 0.494 2175.486 1.589 1.476 1.399 1.273 1450.324 1.297 1.205 1.143 1.039 0.250 0.761 1.489 0.564 2830.624 1.812 1.683 1.596 1.452 1887.082 1.480 1.375 1.303 1.186 0.300 0.811 1.587 0.630 3530.269 2.024 1.880 1.783 1.622 2353.512 1.653 1.535 1.455 1.324UITC 0.350 0.861 1.685 0.693 4274.420 2.227 2.069 1.961 1.784 2849.614 1.818 1.689 1.602 1.457 0.400 0.911 1.783 0.754 5063.079 2.424 2.251 2.135 1.942 3375.386 1.979 1.838 1.743 1.586MAX HVPS 0.450 0.961 1.881 0.814 5896.244 2.616 2.430 2.304 2.096 3930.829 2.136 1.984 1.881 1.711

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.

CEBAF Wien Filter

Spin precesses about B-field:

Lorentz force is zero when:

Operational Values

Build 3rd 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.

Spectrometer

Angle >35 deg

Assuming beam width 3mm and spectrometer arm 1m a 35 deg bend achieves 0.5% momentum resolution

T E g p BL [MeV] [MeV] [MeV/c] [G-cm]

0.100 0.611 1.196 0.335 671.501CEBAF 0.130 0.641 1.254 0.387 775.797 0.150 0.661 1.294 0.419 840.542 0.200 0.711 1.391 0.494 991.062 0.250 0.761 1.489 0.564 1130.482 0.300 0.811 1.587 0.630 1262.486ITCU 0.350 0.861 1.685 0.693 1389.189 0.400 0.911 1.783 0.754 1511.924MAX HVPS 0.450 0.961 1.881 0.814 1631.588

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 3rd 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