A deposition system (100, 200) for depositing silica particles onto a workpiece (224, 610, 654) comprising: - a first set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) for depositing silica particles onto a first portion of the workpiece (224, 610, 654), the first set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) having a first chemical deposition burner (220, 300, 502, 602, 604, 606, 642, 644, 646) and second chemical deposition burner (220, 300, 502, 602, 604, 606, 642, 644, 646); - a second set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) for depositing silica particles onto a second portion of the workpiece (224, 610, 654), the second set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) having a third chemical deposition burner (220, 300, 502, 602, 604, 606, 642, 644, 646) and a fourth chemical deposition burner (220, 300, 502, 602, 604, 606, 642, 644, 646); and - a lathe for holding the workpiece (224, 610, 654) and for rotating the workpiece (224, 610, 654) relative to the first set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) and second set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646); wherein the first and second portions of the workpiece (224, 610, 654) overlap each other at an overlap segment onto which one chemical deposition burner (220, 300, 502, 602, 604, 606, 642, 644, 646) from each set deposits silica particles, and wherein the longest distance between chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) within any set is less than the shortest distance between chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) in different sets, and wherein in the deposition process the chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) remain at fixed distances from each other while traversing the workpiece between a left-end portion and a right end portion, characterized in that in the deposition process when the chemical deposition burners traverse the workpiece between the left end portion and the right-end portion, at any point of the workpiece two burners deposit silica soot on the workpiece, except at the ends of the workpiece, where at the left end-portion only the leftmost burner will deposit silica soot and at the right end-portion only the rightmost burner will deposit silica soot. - a first set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) for depositing silica particles onto a first portion of the workpiece (224, 610, 654), the first set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) having a first chemical deposition burner (220, 300, 502, 602, 604, 606, 642, 644, 646) and second chemical deposition burner (220, 300, 502, 602, 604, 606, 642, 644, 646); - a second set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) for depositing silica particles onto a second portion of the workpiece (224, 610, 654), the second set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) having a third chemical deposition burner (220, 300, 502, 602, 604, 606, 642, 644, 646) and a fourth chemical deposition burner (220, 300, 502, 602, 604, 606, 642, 644, 646); and - a lathe for holding the workpiece (224, 610, 654) and for rotating the workpiece (224, 610, 654) relative to the first set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646) and second set of chemical deposition burners (220, 300, 502, 602, 604, 606, 642, 644, 646);