Status of the Fast Deflectors for ELENA B
Status of the Fast Deflectors for ELENA B. Balhan, A. Prost
Fast deflector positions 1, 2 Elena horizontal-left 3, 4, 5, 6 TL horizontal-right 7, 8 TL vertical-up 9 TL horizontal-left 3 4 1 6 7 5 8 2 9 22/05/2014 ELENA IIC Meeting 2
Device parameters Beam momentum Beam energy Deflection nominal (max. ) Required electric field (max. ) Electrode capacitance (w. r. t to virtual ground, without feedthrough) Required Voltage nominal (max. ) Gap between electrodes upstream Gap between electrodes downstream Electrode height Electrode length Beam acceptance (Ø) Field homogeneity Good field region (Ø) Rise time (2 – 98%) Fall time (98 – 2 %) Flat top length Flat top stability Device length (flange to flange) Tank diameter Upstream tank flange Downstream tank flange TDR (2013) 13. 7 100 180 0. 09 27 ± 5. 1 115 130 400 60 ± 0. 75 52 1 1 0. 4 - ∞ 0. 1 700 260 DN 63 DN 150 Electrode material Stainless steel 316 LN Vacuum tank material Stainless steel 316 LN 22/05/2014 ELENA IIC Meeting 2014 values 220 (240) 0. 11 (0. 12) 6. 1 (6. 7) 500 277 Me. V/c ke. V mrad MV/m p. F k. V mm mm mm % mm μs μs μs % mm mm DN 273 3
Conceptual design 22/05/2014 ELENA IIC Meeting 4
Cross section (top view) Field clamps (obturateurs) required to represent tank flanges, if adjacent vacuum chambers are not similar as in concept design. 22/05/2014 ELENA IIC Meeting 5
Field clamps 22/05/2014 ELENA IIC Meeting 6
Assembly drawing 22/05/2014 ELENA IIC Meeting 7
Target and mechanical supports Alignment target supports (horizontal) Mechanical support feet (Vertical) Mechanical support feet (Horizontal) Alignment target supports (vertical) 22/05/2014 Fixation of deflector support on intermediate base plate: • Round fixed hole upstream to define position radially (x, z) • Race track upstream to allow to thermal expansion during bake out • Race track hole downstream to determine radial position (x) • Large diameter hole downstream to allow for thermal expansion during bake out • Hole 1. 2. 3 fixation on the support (tilt). ELENA IIC Meeting 8
HV Feedthrough 1 feedthrough per electrode. Standard item supplied by CERAMTEC, DN 35 CF flange mounted version, certified for 7 k. V DC. Connection block will be electron beam welded to feedthrough stem. Flexible connection optimised for low inductance and bake-ability. This feedthrough was successfully used in the Med. Austron fast deflector at 3. 5 k. V, and will need validating for use at 6. 1 k. V pulsed current. If not validated, alternative feedthrough are identified, but this would need modification of the electrical connection. 22/05/2014 ELENA IIC Meeting 9
Outstanding issues Length of fast deflector reduced from 600 mm to 500 mm. Upstream: fixed flange / Downstream: rotating flange. 3 points support for tank ( upstream: 1 / downstream: 2). Optional field clamp (obturateur) for both flanges. Target support defined. 316 LN use for vacuum vessel (+ parts in the vessel). What bake out system will be used for Fast deflector? Feedthrough validation. Vacuum chamber grounded? NEG coating for tank as per EDMS 1380064. However, for the electrodes this may be costly. No budget foreseen for this by ABT. Spare strategy (depends on bake out approach, integration and has a direct impact on budget): 1 spare vertical device +1 spare horizontal device, or…. 1 compatible version for both Engineering specification being written. 22/05/2014 ELENA IIC Meeting 10
Summary • Mechanical design: – Mechanical design finished by J. F. Poncet. – Mechanical design being reviewed by ABT/SE. – Electric field simulated by B. Balhan. – Drawing release planned for mid June. • Parts procurement phase as from July 2014. • Assembly of 2 fast deflectors (Elena ring) planned for October 2014. • Assembly of 7 fast deflectors (TL) + spare(s) in 2015. 22/05/2014 ELENA IIC Meeting 11
- Slides: 11