{"product_id":"small-area-rpa-grid-set","title":"Small-Area RPA Grid Set","description":"\u003cp\u003ePart No. 404-0031 RPA Grid Set\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReplacement grid set for the 404-0008 Small-Area RPA: 4 meshed grids + 1 collector electrode.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eECCN: EAR99\u003c\/p\u003e\n\u003cp\u003eHTS: 903033\u003c\/p\u003e\n\u003cp\u003eRPA meshed grids are subject to sputter erosion when exposed to an ion beam. Over time, ion impact can progressively thin and remove the mesh material along the beam path. In many cases, erosion is not detectable electrically or mechanically during operation. The meshed grids are electrically isolated by design. Because sputter erosion does not necessarily create an electrical short, the grid may remain electrically isolated even after significant material loss. As a result, electrical continuity checks are not a reliable indicator of mesh integrity.\u003c\/p\u003e\n\u003cp\u003eOnce the mesh is significantly thinned or fully removed, the RPA may exhibit degraded or unphysical analyzer signals:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLoss of energy discrimination\u003c\/li\u003e\n\u003cli\u003eIncreased signal magnitude due to unfiltered ion transmission\u003c\/li\u003e\n\u003cli\u003eFlattened or distorted I–V characteristics\u003c\/li\u003e\n\u003cli\u003eReduced repeatability between scans\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAs a result, visual inspection may be the only reliable method for determining whether a mesh has been eroded.\u003c\/p\u003e\n\u003cp\u003eReplacement of the parts requires disassembly and reassembly of the unit.\u003c\/p\u003e\n\u003cp\u003eEntrance aperture diameter: 1.27 cm (0.5 in)\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGrid open area: 77% each grid (100 lines\/inch, square hole width 0.0088 inch).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGrid material: SS 316\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eLead Time: Typically 4 weeks if not in stock.\u003c\/p\u003e","brand":"Plasma Controls","offers":[{"title":"Default Title","offer_id":47343944073403,"sku":null,"price":265.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0063\/7704\/6085\/files\/404-0031RPAGridSet_eaba231b-4784-4002-bdc8-4bb5484bcfda.jpg?v=1767827102","url":"https:\/\/shop.plasmacontrols.com\/products\/small-area-rpa-grid-set","provider":"Plasma Controls","version":"1.0","type":"link"}