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Pepper Pot monitor for the Linac3 ITL Line

Pepper Pot monitor for the Linac3 ITL Line. MSWG– 13- Aug -2013 F.Roncarolo , A.Ravni. Introduction. SCOPE Provide emittance measurement after the ITL spectrometer CONSTRAINTS Only space available is diagnostic tank presently hosting slit+ SEM grid + Farady cup Beam not round

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Pepper Pot monitor for the Linac3 ITL Line

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  1. Pepper Pot monitor for the Linac3 ITL Line MSWG– 13- Aug -2013 F.Roncarolo, A.Ravni

  2. Introduction SCOPE • Provide emittance measurement after the ITL spectrometer CONSTRAINTS • Only space available is diagnostic tank presently hosting slit+ SEM grid + Farady cup • Beam not round • Limited resources in BI PROPOSED SOLUTION • Buy a commercial pepper pot system to be integrated into the diagnostics tank at the place of the SEM grid F.Roncarolo

  3. Linac 3 - LEBT Existing Diagnostic Tank Source ITL F.Roncarolo

  4. ABP - Request • single charge state ion beam from an ECR ion source after the spectrometer • intensity: 200 eμA for Pb29+, but could be >1emA for other (lighter) ions • time structure: 10Hz, 50ms heating pulses with beam extracted, plus ~2ms afterglow • beam energy: 2.5 keV/u for interesting beam, other charge states/species from same potential • dimensions of the beam: x = +-1.5 mm, xp =  +-130 mrad, y = +-9 mm, yp= +-9.5 mrad, • nominal lead beam, 100% beam envelope • the system needs to be retractable from the beam line • the system should be made of UHV compatible components F.Roncarolo

  5. Offers • DetlefKuchler contacted • Helmholtz-Zentrum Dresden-Rossendorf • KernfysischVersnellerInstituut (KVI), Groningen, the Netherlands • PANTECHNIK S.A. , France • Commercialization of KVI system, especially developed to meas. Emittance at ECR sources front-end • Pepperpot ‘pinhole’ mask, tungsten foil with a vertical row of 20 holes (20um diameter, 2mm pitch, changeable at the moment of ordering) • X,X’ + Y,Y’ reconstruction by scanning the vertical row along the hor axis • MCP plate + phosphor screen • CCD camera • Control-Acquisition-Analysis SW PANTECKNIK offer recognized as the best (D.Kuckler, R.Scrivens, E.Bravin, J-J.Gras, F.Roncarolo)  started to investigate integration into existing tank (A.Ravni, BI-ML) F.Roncarolo

  6. PANTECHNIK system Pepper pot plate MCP, PHOSPHOR Camera F.Roncarolo Mirror BEAM

  7. Integration into existing tank (A.Ravni) Faraday Cup Pepper Pot SLIT F.Roncarolo

  8. Integration into existing tank (A.Ravni) Faraday Cup Variable Diameter S-Shaped Pepper Pot SLIT Faraday Cup • This tank design • verified with main workshop • allows keeping SLIT and FC mechanisms as existing Pepper Pot SLIT F.Roncarolo

  9. Integration into existing tank (A.Ravni) • Tank modifications w.r.t. existing one • Slit moved forward of 50 mm (maximum allowed, A.Lombardi) • Tank diameter reduced of 46 mm (300  254 mm) • Tank length increased of 70 mm (310  380 mm)  shorter bellow on 1 side) • to avoid interference w. Pepper Pot • FC side diameter opening changed • Slit side tank with S-shape (angle) • Still to be decided: interconnection to upstream pipe, being discussed with Vacuum (J.Hansen), to avoid having bellow directly soldered on pipe (as proposed by BI-ML) F.Roncarolo

  10. Timing and gating Linac3 requirements: 50ms pulse + 2 ms (max) afterglow, 10Hz rep. rate - want to sample afterglow emittance with 100us (max) sampling rate Pantechnikproposed: -Camera: SONY XCL-U1000 shutter trigger rate 15Hz (max) shutter gate length from 100us to 66ms -Phosphor: P43 1.2 ms decay time So, we looked at alternative phosphors -R42, P47 fast enough -P47 better radiation hard F.Roncarolo

  11. Camera sensitivity matches better R42 than P47, but P47 has twice the emissivity (see table previous slide) Conclusion: Pantechnik accepted to provide P47 for same price as P43 F.Roncarolo

  12. Conclusions • Commercial Pepper Pot • Order approved by purchasing officer on Aug 9th • Design of new tank finished • Slit and FC as they are • If approved by all concerned people • Launch tank fabrication • Delays • From Pantechnik offer: 5 month (Aug. Excluded) • Need to follow up to ensure reception and installation for ~Feb2014 • Costs • 90kEu • Tank costs to be estimated • Operation&Control • It is not foreseen to integrate the system into the CO infrastructure • System to be used on stand-alone PC (control + data processing via Labview provided by Pantechnik) • ‘VIA fellow’ (shared by ABP and BI), from end of 2013, supposed to look also into emittance measurements at Linac3 F.Roncarolo

  13. F.Roncarolo

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