1. QXF Shell & Yoke: LARP Experience in LR, HQ, LQ Dan Cheng Sept 17, 2013

2. Outline Examination of machining and assembly factors that could affect the shell/yoke friction factor behavior differences within LARP magnets – LR – LQ – HQ Sept 17, 2013 D.W. Cheng - LARP Shell & Yoke Experience 2

3. LR Information LR Shell (25O943) – 6061-T6 Aluminum (drawn tube) – Surface finish: called out to be 64 or better Raw material was thick-walled tube that was bored and honed to final diameter (nicer finish than 64, that is) – ID: 11.000 +.005/-.000 LR Yoke (25O944) – 1018 Steel – Surface finish on OD: 32 OD turned on a lathe before disks were cut in half – OR: 5.480 +.000/-.003 (equivalent OD: 10.960 +0/-.006) Lubricant: – Dow Corning Molykote® Z Moly Powder – 3-4 µm particle size Sept 17, 2013 D.W. Cheng - LARP Shell & Yoke Experience 3

4. LQ Information LQ Shell (27E993) – 6061-T6 Aluminum (forged) – Surface finish: 32 – ID: 17.953 +.010/-.000 4 segments made from 1 long cylinder, with end-to-end variance in diameter of.002; made from same vendor as LR LQ Yoke (27F188) – 1018 Steel – Surface finish on OD: 32 – OR: 8.976 +.000/-.002 (Equiv. OD 17.952 +0/-.004) Lubricant: – Dow Corning Molykote® Z Moly Powder – 3-4 µm particle size Sept 17, 2013 D.W. Cheng - LARP Shell & Yoke Experience 4

5. HQ Information HQ Shell (27F839) – 7075-T6 Aluminum (Oakland Machine works) – Surface finish: 32 (honed bore) – ID: 20.472 +.010/-0 HQ Yoke (27F846) – 1018 Steel (Mon-Tek) – Surface finish on OD: 32 – OD: 10.236 +0/-.002 (equiv 20.472 +0/-.004) Lubricant: – Dow Corning Molykote® Z Moly Powder – 3-4 µm particle size Sept 17, 2013 D.W. Cheng - LARP Shell & Yoke Experience 5

6. Items to Note All shell ID surfaces were honed to at least a 32 finish Yoke OD surfaces called out to 32 finish as well – LR (dipole configuration) yoke diameter was machined.040 undersized, max – LQ & HQ yoke diameters were machined to shell ID, max All assemblies used Dow Corning Molykote Z Powder Sept 17, 2013 D.W. Cheng - LARP Shell & Yoke Experience 6