HV connection for a Common GEM foil design Aiwu Zhang 2015-03-09.

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Presentation transcript:

HV connection for a Common GEM foil design Aiwu Zhang

2 The foil is divided to sectors on the top, while it is not segmented on the bottom. 550 mm ~946 mm 30 degrees

Center line 1.Vias are used. red color stuff on top foil, blue color stuff on bottom foil. -> Explain on HV connection: FIT HV pads all on top foil. (6 for top HV and 6 for bottom HV). We bring these pads, using spring pins, to the drift board to make HV connection. For a triple-GEM, we cut away 8 of the pads on each foil to allow spring pins go through the foil. 3. For FIT, we use 10M SMD resistors for each sector for protection. After the resistors, we have a common HV line goes to the 6 FIT HV pads. We also have a short common HV line on the bottom, goes to the 6 FIT HV pads through vias. 4. For UVa, their protective resistors are not on the foil, and they want to be able to test each sector once the chamber is closed. So individual HV pads are arranged for UVa, those pads are connected to each sector through the vias.  A global view at the wide end FIT HV pads UVa HV pads FIT protective resistors

-> Explain on mechanically assembling a chamber: 6. The gray pads, with a 2 cm pitch, are mechanical holes on the foil. UVa can use them to close a chamber; FIT can use them to make a GEM stack for stretching. 7. For FIT, we need to have square holes in the foil, to allow us put nuts in for stretching. The square holes must be siting in the same row of those mechanical holes. (note that FIT HV pads are also in the same row.)  A global view at the wide end. 4 Center line Mechanical holes Square mechanical holes for FIT stretching

The left part Note that we have 4 horizontal sectors at lower end, the left 4 resistors are connected to those sectors. 5 Vias needed (connect red trace to blue trace)

~6.1mm 20mm 3mm 5.8mm 9.5mm 3mm Dimensions. Need to optimize, especially along the R direction. All trace width: 0.2mm Copper edge of a foil 6 1.8mm

2.5mm Dimensions. Need to optimize, especially along the R direction. 7 Just pay a little attention to that corner (will be the same at the right side of foil) 15mm

8 ref.: High Voltage Engineering - J R LUCAS, 2001 (Chapter 1) Breakdown voltages for Ar and CO2: Ar: 0.9 torr cm = 0.9* *10 atm mm = atm mm at 1 atm, it is 137/ = ~11211 V/mm -> breakdown happens at ~1100 V for a 0.1mm gap. CO2: 420/(0.51* *10)=60642V/mm -> breakdown happens at 6064V for a 0.1mm gap.

9 UVa HV pads FIT HV pads (for top) FIT HV pads (for bottom) Holes for assembling UVa HV pads (for bottom). Can be on top and connects through a via Square holes for FIT for stretching FIT resistor Common HV line A via Backup