1. SCU1 Vertical Test Results Matt Kasa 9/16/2014

2. Vertical Cryostat Assembly Coil Training Record the current decay and the terminal voltage across the coils during a quench Hot spot temperature estimate derived from the current decay and MIITs Hall Probe field scans for preliminary magnetic measurements Carbon fiber guide tube in the gap of the magnet Cloth bellows attached to the vertical stage, ices up during a scan Field scans were performed after training the magnets Period lengthmm18 PeriodsN59.5 Magnetic lengthm1.07 Magnetic gapmm9.5 Conductor Diametermm0.6 SCU1 Parameters

3. Coil Training Both main coils trained to 580 A, same Ic as the short prototypes Core 1 – 67 training quenches Core 2 – 140 training quenches MIITs hot spot temperature estimation with cores wired in series was ~60 K Maximum voltage at terminals with cores wired in series was ~120 V

4. 400 A Main, 0 A Correction Final 1 st integral is ~-750 G-cm. Equivalent to a dipole field of -5.7 G Final 2 nd integral ~400 kG-cm^2 S-shaped trajectory due to no correction current

5. 400 A Main, 24 A Correction Offset added to the field to compensate for apparent dipole, therefore 1 st integral is 0 S-shaped trajectory is fixed by correction coils, but the offset cannot be fully corrected while keeping a straight trajectory Due to 1018 steel used for the core, 1006 will be used in the future

6. Field integrals scale with main current Absolute values are uncertain, will be measured with rotating coil in horizontal measurement system Phase errors are low without shimming Had a 500 A scan with ~3.2 deg. RMS

7. 1 st Integral Correction Unclear what causes the dipole field A pair of coils will be installed above the top core and below the bottom core to provide a means for correction 20 turns of superconductor with 20 A of current results in ~10 G dipole field

8. 2 nd Integral Correction SCU1 needs to use external correctors – plan is to install correction coils upstream and downstream of the device inside the cryostat 130 turn racetrack coil, 22 AWG with a 25 mm iron core 1340 G at 4 A Tied to the 1 st Stage cooling circuit

9. Magnetic Gap Magnetic gap increases towards the ends of the device Magnetic measurements indicate that the gap is ~0.1 mm larger An attempt will be made to adjust the thickness of the gap spacers to create a more uniform gap

10. Summary The two cores reached the same critical current as the short prototypes The SCU1 preliminary magnetic measurements are very encouraging Low phase errors appear to be achievable without the need for shimming The 1 st and 2 nd integrals can be corrected with external correction coils The uniformity of the magnetic gap will be improved

11. Extra Slides

12. Inductance and Stored Energy

13. Effect of the Cooling Channel and Low Carbon Steel 2d simulations of the magnet assembly in FEMM 1018 LCS No channel 19 mm 25.4 mm 1006 LCS No channel 19 mm 25.4 mm Only correction current, no main Cooling channel Top Core Bot Core Gap

14. Effect of the Cooling Channel and Low Carbon Steel – Correction Field

15. Effect of the Cooling Channel and Low Carbon Steel – Correction Field Integral