HQ02 Magnetic Measurements Prelim. Results Overview

28Jun2013

Z-scan 300K 100K 20K 6500 8500 14605 964 8500 14605bef Quench 50mm steps A A Aaft Training 25mm steps A

50mm steps (upramp) A A A50mm steps (dnramp) A

100mm steps A A A, B CStairstep to 8500A to 14605A to 14605A

bef quench 500A to 2kA, then 2kA steps Aaft training 250A to 2kA, then 1kA steps A A

ResetCur to 14605aft training min. cur 300A, 600A, 900A A

Loops to 8500 to 14605 to 11000A to 14605bef quench 13, 40, 60A/s A A

aft training 13, 20, 40, 80A/s A A,B,CAccel profile to 8500 to 14605 to 14605

bef quench aft training

13A/s accel. A A*32A/s accel. A

Coil imbalance tests to 8500 to 14605 to 14605aft training

harm configuration A Atiming Az dep A

HQ02 Test Cycle 1 Magnetic Measurements (+/- 10A) Currents CurrentsAbove 20K 2K4K

Summary of Magnetic Measurements Performed on HQ02

A – 200mm and 100mm long PCB probe (simultaneous acquisition of both circuits)B – dual 100mm long PCB probe (simultaneous acquisition of both circuits)C – 100mm long Tangential probe

Z-scans 2K

964A

14605A scans repeat well

8500

14605

Saturation effectZscans on upramp and downramp show stable persistent current magnetization vs. z

Changes in b3/a3 vs Z-position are ~5 units in the straight section - indicating some variations in coil geometry

b6 change is ~2 units

From standard deviation of harmonics in the magnet straight section,can calculate amplitude of coil block variations from HQ02 cross-section error fit.

48mm axial coil position variation is larger than TQ or HQ01 which were closer to ~30mm

3 4 5 6 7 8 9 101E-01

1E+00

1E+01

a-stdev

b-stdev

fit

Harmonic order

harm

onics

σ (u

nits

Rre

f = 4

0 m

m)

Apply same technique among the three assemblies HQ01d, HQ01, and HQ02

Coil position variation is ~ 62mm

TQ series had ensemble variation of ~140mm

Courtesy XRW

Accelerator profile reproducibility test

Accelerator profile injection porch b6

decay and snap-back

About 0.5 units b6 change over 20 min.

Ramp up from 50A

300A

600A

900A

Accelerator Cycle Reset Current Test

Loops at 20, 40, 80A/s ramp rates at 3 different z-positions

b6 has very comparable shape for all three positions

a3 has some small differences especially in the -0.2m position

Loops at 20, 40, 80A/s ramp rates at 2K and 4K temperatures

(I’ll improve the plots from what’s shown here…)

Perhaps a slide on the coil imbalance tests ?