L 4 PSB Injection Technology Department Stripping Foil

L 4 – PSB - Injection Technology Department Stripping Foil and instrumentation R. Noulibos - W. Weterings – Pieter Van Trappen Technical meeting 21 -mai-2014 EDMS doc. 1370573 1

L 4 – PSB Injection: Stripping Foil System Technology Department Stripping Foil Function PS Booster Rings KSWs NEW L 4 -PSB 4 RINGS INJECTION SYSTEMS BSWs From Linac 4 BI-DIS BI-SMV Chicane Ø Linac 4 produces a 160 Me. V H - beam Ø Ø Ø Dump Beam is distributed in 4 PS Booster chicanes [BI. DIS + BI. SMV] KSWs produce a circulating beam painting bump BSWs produce the injection bump Stripping foil in chicane converts H- in H+ H 0/H- dump intercepts un-stripped H 0/HH + are introduced in the PSB ring STR Chicane

L 4 – PSB Injection: Stripping Foil System Technology Department Injection chicane principle PSB beam orbit

L 4 – PSB Injection: Stripping Foil System Technology Department Injection region [chicane] BSW 3 STR BSW 2 BSW 1 BHZ BSW 4 + Dump BHZ

L 4 – PSB Injection: Stripping Foil System Stripping foil position Technology Department Internal dump Stripping foil Changer H+ Stripping foil O al t rbi m a Be H 0 H- H+ H 1 µm thick carbon foil (24 x 68 mm) Beam current measurements

L 4 – PSB Injection: Stripping Foil System Technology Department Stripping foil vacuum tank BI. STR vacuum tank with BSW 2 & 3 vacuum chambers Screen mechanism flange Camera flange Bellow Inconel Undulated chambers Viewport + foil changer mounting

L 4 – PSB Injection: Stripping Foil System Technology Department Stripping foil specification BI-STR Tank BSW 2 BSW 3 148 & 132 Foil & frame constraints Top view of foil mechanism

L 4 – PSB Injection: Stripping Foil System Technology Department Case BI. STR Used cases Description Method 1 – Charger present Does the stripping foil system contain a charger. 2 – Zero position Define the foil band reference position (requested from controls). 3 – Index foils Use BTV to define theoretical beam spot, align foil edge, store in Set-up and indexation of all 6 stripping foils, or only new replaced data-base. stripping foils, with respect to theoretical beam position and band reference. Also index ‘empty’ positions. Interlock or BTV IN, OR foil movement. -> Potentiometer 4 – Foil “X” “foil IN” Move foil nr “X” into theoretical beam position. This could be a Identify current foil index, calculate displacement for foil “X”, move ‘fast’ movement of 1 -5 foils, with ‘slow’ movement for final foil ”X” in position. -> Stepper Motor + micro-switches positioning. 5 – Reference lost Reference position has been lost by stepping motor. Use mechanical band indexation -> Actuator 6 – Adjust foil Foil IN reference position is 2. 5 mm before rotation point of foil band. ± 2 mm movement of the foil allowing horizontal adjustment of the foil. -> Potentiometer 7 – No foil “foil OUT” Intermediate position, no foil in beam. To be used for pilot beams on H 0/H- dump. (Needs to be interlocked for higher intensities!) Rotation of foil band in both directions allowed? Or make full turn to get back previous foil. -> Yes 8 – Broken foil In case a foil has stripping efficiency<90%, identified broken, etc. 9 – “BTV IN” 10 – Foil current Have a switch to identify if a charger is (correctly) installed a) Use BTV camera b) Use mechanical band indexation -> Actuator Signal from H 0/H- dump monitor, or foil current (Case 10), interlock foil in data-base. Check foil position to be IN or OUT-> micro-switches a) If foil IN, interlock BTV movement, foil movement allowed -> In case BTV screen is in reading position, no movement of the foil micro-switches + potentiometer. is allowed. b) IF foil OUT, interlock foil movement, BTV movement allowed-> micro-switches + potentiometer. . Identify stripping efficiency change by changing signal of the foil. Isolate foil frame (or charger) from ground and measure signal from foil -> macor spacers.

L 4 – PSB Injection: Stripping Foil System Stripping foil gluing Technology Department 1 µm thick carbon foil ACF-200 (24 x 68 mm) Aquadag 18% Stainless steel frame Available Foil types _ Foil ACF-200 - (200µg-1µm) 21 mm x 68 mm _ Foil ACF-200 - (200µg-1µm) 24 mm x 68 mm _ Foil ACF-200 - (200µg-1µm) 21 mm x 68 mm - collodion-coated _ Foil ACF-400 - (400µg-2µm) - 24 mm x 68 mm _ Foil XCF-200 - (200µg-1µm) 32 mm x 68 mm - collodion-coated _ Foil DLC-13 -2000 -S (400µg-2µm) 25 mm x 65 mm _ Foil DLC-13 -1000 -S (200µg -1µm) 25 mm x 65 mm Aquadag 18% : 2 drops (Syringe) cotton stick manipulation (precision? )

L 4 – PSB Injection: Stripping Foil System Technology Department Stripping foil vacuum test 1 µm thick carbon foil (24 x 68 mm) Foil types test = OK _ Foil ACF-200 - (200µg-1µm) 21 mm x 68 mm _ Foil ACF-200 - (200µg-1µm) 24 mm x 68 mm _ Foil ACF-200 - (200µg-1µm) 21 mm x 68 mm - collodion-coated _ Foil ACF-400 (400µg-2µm) - 24 mm x 68 mm Successful p vacuum tests

L 4 – PSB Injection: Stripping Foil System Technology Department BI. STR mechanism in vacuum tank Resolver Vacuum rotary feedthrough Mirror (BI) Camera (BI) Stepper motor Beam directio n Flexible Coupling Foil changer Zero indexation lever Screen (BI)

L 4 – PSB Injection: Stripping Foil System Technology Department Zero Reference Position Mechanism Micro-switch Radiation hard Vacuum actuator 3. 5 V, 250 m. A 5 mm Stop Lever

L 4 – PSB Injection: Stripping Foil System Foil Displacement Control Technology Department Micro-switches Honeywell: _ Stainless Steel _ Prepared for UHV _ Tested by TE/VSC Function: Control of foil stroke displacement Speed: Stroke 90. 25 mm in ~ 20 s (1 rotation in ~2 mn) Removed with methylene chloride

L 4 – PSB Injection: Stripping Foil System Stripping foil position control Technology Department Membrane potentiometer: _ Vacuum tests ongoing _ Position tolerance +/-0. 5 mm Wiper contact 5 m m

L 4 – PSB Injection: Stripping Foil System Technology Department Instrumentation BTV Screen Developed by BI Beam screen + mirror Camera BTV optical line support

Position adjustment +/-2 mm Zero indexation 146 mm Beam on directi 6 foils (pitch = 90. 25 mm) Spring tensioner Vac fee Stripping Mechanism L 4 – PSB Injection: Stripping Foil Sy Vacuum chamber aperture Technology Department

L 4 – PSB Injection: Stripping Foil System Technology Department Next steps for stripping foil system 1) vacuum tank for prototype (L 4 beam line) 2) membrane potentiometer + support (TE/VSC) 3) foil current measurement 4) foil changer 5) improve gearbox for reference position actuator 4 1 5 2+3

L 4 – PSB Injection: Stripping Foil System Technology Department Questions?