UKRI-1308 DUNE APA Printed Circuit Boards

Tender description

Printed Circuit Boards (PCBs) are needed to construct charge readout anode plane assemblies (APAs) for the Deep Underground Neutrino Experiment based at Sanford Underground Research Facility in South Dakota. Each of these PCBs are required to operate reliably in (Liquid Argon) LAr over many years (20 years) so Quality Assurance is a critical element to this project. A key requirement for these PCBs are the mechanical tolerances. As described below, board thickness must be maintained to ±5%, and machining of features on the board is required to a high tolerance. Lot 1: The requirement is for the fabrication of 45,583 PCBs. The main specifications are: a)Thickness of each board must not exceed +/-5% of the total thickness specified in the drawings. b)Tolerances for Depth milling, Edge milling, Counterbore holes and Countersink holes are critical and should be adhered to. A critical aspect for the milling is that tongues on the edges of some boards must be controlled to a tolerance of ±0.1 mm. c) A summary of the tolerances that must be achieved are as follows: •Board thickness: +/- 5% •Tongue dimensions: +/- 0.1mm •Glue grooves: +/-0.2mm •Board positioning holes: +/- 0.15mm •All other board features: +/- 0.4mm d)The first 75 APA’s worth of boards are to be delivered in batches within a period of 32 months from contract award with the option for a further 75 APA’s worth of boards at a later stage.