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

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

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

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

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

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

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

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

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

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