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Dear all After I changed a broken filament, I could not find signal signal any more. I opened the ion source and checked the filament looks fine. I tried to play with the focusing but there is no luck. Does any body have any idea or suggestion what to do? Best regards Getachew A. Adnew ----------------------------------------------------------------------------------- Getachew A. Adnew PhD student email: [log in to unmask] Institute for Marine and Atmospheric Research Utrecht (IMAU) Princetonplein 5 Utrecht University 3584CC Utrecht, The Netherlands Phone: (+31)-30-2531555