1. Magnetic measurements at ambient temperature on the MQXFBP1
Lucio Fiscarelli
with the help of colleagues from MM and LMF

2. New rotating-coil scanner Measurement campaigns Results
Outline
New rotating-coil scanner
Measurement campaigns
Results
Transfer function
Angle
Multipoles
Magnetic center – data under processing

3. Rotating-coil scanner prototype
The probe is supported by a tube Ø 100 mm
On-board encoder and tilt sensor
Motor unit outside
Mechanical extensions for translating and rotating the probe
PCB (printed circuit) coil with length 500 mm (100 mm)
Measurement radius 40 mm
Optical targets for referring magnetic axis to external points

4. Rotating-coil scanner final version
Ø 136 mm for the cold-bore
Measurement radius 50 mm
Measurement length 600 mm
Based on PCB (printed circuit) coils
Tilt sensor on the PCB coil
Auto-alignment to gravity
Retroreflectors mounted on the PCB
On-board motor

5. Measurement campaigns
1) Coil pack in December 2018
Magnet was disassembled/reassembled
2) Coil pack in February 2019
3) After centering in February 2019
Issue with the prototype scanner
4) After loading in April 2019

6. Coil-pack in December 2018 *
Measurements taken by using the prototype scanner
* Angular offset wrt to gravity not calibrated

7. Coil-pack in February 2019 *
Measurements taken by using the prototype scanner
* Angular offset wrt to gravity not calibrated

8. After centering in February 2019
Measurements taken by using the prototype scanner

9. After loading in April 2019
Measurements taken by using the final-version scanner

10. Field quality summary average* std* integral TF 8.838 Tm-1kA-1 7 units
average*
std*
integral TF
8.838
Tm-1kA-1 7
units
  T kA-1
* Magnet body 6.6 m
Angle
0.78
mrad
0.13
0.83 b3
0.26
0.79
0.02 a3
0.50
0.99
-0.19 b4
0.41
0.48
0.38 a4
-1.23
1.65
-0.59 b5
-0.40
0.29
-0.46 a5
0.10
0.54
-0.18 b6
-5.75
0.37
-4.99 a6
0.51
-0.10 b7
-0.08
0.16 a7
0.08 b8
0.03 a8
0.24
-0.12 b9
-0.07
0.05 a9
-0.01
b10
-0.32
0.20
-0.35
a10
0.01
b11
-0.05
0.04
a11
-0.04
b12
-0.02
a12
0.00
b13
a13
b14
-0.74
a14
b15
a15

11. Full set of measurements data
Conclusions
Full set of measurements data
Coil pack, centering, loading
Field quality is within specifications
Multipoles < 1 unit (apart from b6 that will be cured)
Angle < 1 mrad
Random positioning of blocks ~25 microns
Validation of the new scanner system