1. HQ02b Preload Increase - Summary
Helene Felice
Team: Dan Cheng, Daryl Horler, Paul Bish , Hugh Highley and Nate Liggins
Thank you to Paolo Ferracin, Gianluca Sabbi and Franck Borgnolutti for fruitful discussions on target definition

2. HQ02a Assembly Targets Choice made of a conservative Azimuthal
Mid-plane quenches
Choice made of a conservative Azimuthal
target preload ~ 200 T/m
In agreement with short sample prediction
Target Preload at 300 K:
eq shell / pole = 863 me / -450 me
sq shell / pole = 66 /-63 MPa
Target Preload at 4.2 K:
eq shell / pole = 1905 me / -720 me
sq shell / pole = 169 / -147 MPa
Axial Preload in agreement with previous
HQ assemblies
sz rod = 60 / 160 MPa
ez rod = 880 me / 2000 me
Axial preload was never an issue in HQ
HQ01 experience
12/12/2013
H. Felice

3. Proposal from 11/27/2013 meeting
Assumption based on training behavior: lack of preload starting at 15 kA
Spread among coils is very likely (seen during initial HQ02a preloading)
Conservative approach would be:
HQ02a (ref)
Option1a
4.2 K Iss
Option 1b
1.9 K Iss
sq shell
MPa
170
203
250
Preload kA
15 (ref)
16.4
18.3
Gradient
T/m
186
206
Peak sq in coil at cold 3D baseline
-189
-220
-265
Peak sq in coil at cold w more interception
-150
-180
-227
Peak sq at 206 T/m 3D baseline (intercept)
-190 (-170)
-203 (-185)
-220 (-205)
Shim mm
390 (ref)
590 (+200)
890 (+500)
Additional shim in mils
mils +8
+20
Target: 200 MPa at cold
12/12/2013
H. Felice

4. Target and shim definition for HQ02b
~ 10 mils
From model and measurements 57 me/mil
Deq = 615 me
HQ02a
Pre test
300 K
HQ02a2 post test
Target
HQ02b
4.2 K
Target HQ02b
eq shell me
822
685
~ 1300
ez shell
100 7
~ 10
sq shell
MPa 66 54
203 98
ez remains ~ constant during loading
Virgin coils
Dsq measured during HQ02a cool-down
Computed based on training behavior
Shim increase by ~ 10 mils (250 mm)
12/12/2013
H. Felice

5. Increase preload on 12/09/2013 Target: 10 mils per quadrant
Added in 12 steps:
3 mils per quadrant : 4 steps
4 mils per quadrant: 4 steps
Bladder pressure
HQ02a: up to 3000 PSI (21 MPa)
HQ02b: from 3300 to 5200 PSI (36 MPa)
12/12/2013
H. Felice

6. HQ02b Shell measured strain after load increase
Azimuthal strain
Axial strain
-10 me
+/- 53
1270 me
+/- 105
Target ~ 1300 me
Shell azimuthal strain on target at room temperature
12/12/2013
H. Felice

7. HQ02b Shell measured stress after load increase
Azimuthal stress
Axial stress
33 MPa
+/- 6
100 MPa
+/- 10
Target: 98 MPa
Shell azimuthal stress on target at room temperature
12/12/2013
H. Felice

8. Pole SG data Coil pole SG seem to be measuring at room temperature
Coil pole average before loading
-343 me +/- 199
To be compared to
HQ02a post loading:
-403 me +/- 181
SG seems reliable at room temperature
12/12/2013
H. Felice

9. Pole SG data Coil pole SG seem to be measuring at room temperature
Coil pole average before loading
-343 me +/- 199
To be compared to
HQ02a post loading:
-403 me +/- 181
Coil avg after loading
-603 me +/- 150
Deq = 260 me => -26 me/mil
Model predicts -30 me/mil
SG seems reliable at room temperature and responsive to load
SG issue might come from Temperature compensation
12/12/2013
H. Felice

10. Summary HQ02b has an increased preload wrt HQ02a-a2
Preload target redefined based on training performance
Target reached during assembly
By addition of 10 mils / 250 microns shims
SG seems to be reliable at room temperature
Spread in coil remains large
Temperature compensation is in question
12/12/2013
H. Felice