Measuring and Maintaining Septum Frame Rail Straightness Noah

MI-52 Electrostatic Septa • • • 2 12 ft. (3. 7 m) in length

MI-52 Electrostatic Septa • • • 3 12 ft. (3. 7 m) in length

Measurement Method • Taylor Hobson Autocollimator – 0. 2 Arc second accuracy – 15

Measurement Method 5 7/24/2019 Noah Curfman | Slow Extraction Workshop

Measurement Method 6 7/24/2019 Noah Curfman | Slow Extraction Workshop

Initial Measurement Results • Frame is 0. 0047” (4700μin) bowed out of true •

Effect of Wire Retainer Bolt Torques 8 7/24/2019 Noah Curfman | Slow Extraction Workshop

CNT Wires in HV Environments • • 9 Rhenium Alloys W 3 Re 1

CNT Wires in HV Environments 10 7/24/2019 Noah Curfman | Slow Extraction Workshop

CNT Wires in HV Environments HV Test Wire 11 7/24/2019 Noah Curfman | Slow

CNT Wires in HV Environments HV Test Wire 12 7/24/2019 Noah Curfman | Slow

CNT Wires in HV Environments HV Test Wire 13 7/24/2019 Noah Curfman | Slow

CNT Wires in HV Environments HV Test Wire 14 7/24/2019 Noah Curfman | Slow

CNT Wires in HV Environments 15 7/24/2019 Noah Curfman | Slow Extraction Workshop

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Measuring and Maintaining Septum Frame Rail Straightness Noah Curfman Slow Extraction Workshop 24 July 2019

MI-52 Electrostatic Septa • • • 2 12 ft. (3. 7 m) in length 0. 004 in (. 1 mm) W 25 Re Wires under 2. 9 N of tension 0. 1 in (2. 54 mm) wire spacing Intentionally bowed 0. 006” (0. 15 mm) out of true -100 k. V cathode 7/24/2019 Noah Curfman | Slow Extraction Workshop

MI-52 Electrostatic Septa • • • 3 12 ft. (3. 7 m) in length 0. 004 in (. 1 mm) W 25 Re Wires under 2. 9 N of tension 0. 1 in (2. 54 mm) wire spacing Intentionally bowed 0. 006” (0. 15 mm) out of true -100 k. V cathode 7/24/2019 Noah Curfman | Slow Extraction Workshop

Measurement Method • Taylor Hobson Autocollimator – 0. 2 Arc second accuracy – 15 ft (4. 6 m) measurement range • Tinsley Mirror Sled – Contacts rails only – Minimal force on frame – Measurements unaffected by granite flatness W. Moore and G. Harrison, Foundations of mechanical accuracy. Bridgeport, Connecticut: Moore Special Tool, 1970, p. 73. 4 7/24/2019 Noah Curfman | Slow Extraction Workshop

Measurement Method 5 7/24/2019 Noah Curfman | Slow Extraction Workshop

Measurement Method 6 7/24/2019 Noah Curfman | Slow Extraction Workshop

Initial Measurement Results • Frame is 0. 0047” (4700μin) bowed out of true • Stabilized conditions would improve measurement quality – Prohibitively expensive to achieve at this time 7 7/24/2019 Noah Curfman | Slow Extraction Workshop

Effect of Wire Retainer Bolt Torques 8 7/24/2019 Noah Curfman | Slow Extraction Workshop

CNT Wires in HV Environments • • 9 Rhenium Alloys W 3 Re 1 mm x 25µm Foil Dex. Mat 100µm CNT Fiber 33 k. V Ramp over 2 weeks 3 e-8 Torr Vacuum 7/24/2019 Noah Curfman | Slow Extraction Workshop

CNT Wires in HV Environments 10 7/24/2019 Noah Curfman | Slow Extraction Workshop

CNT Wires in HV Environments HV Test Wire 11 7/24/2019 Noah Curfman | Slow Extraction Workshop New Wire

CNT Wires in HV Environments HV Test Wire 12 7/24/2019 Noah Curfman | Slow Extraction Workshop New Wire

CNT Wires in HV Environments HV Test Wire 13 7/24/2019 Noah Curfman | Slow Extraction Workshop New Wire

CNT Wires in HV Environments HV Test Wire 14 7/24/2019 Noah Curfman | Slow Extraction Workshop New Wire

CNT Wires in HV Environments 15 7/24/2019 Noah Curfman | Slow Extraction Workshop