Set coincidence gate of two paddles to fall within 15-20 ns
Verify that scalers are set for the paddles: singles from front and back + coincidence.
Verify that gas is flowing into Accelerator Room (bubbles).
The zero point is where the laser beam intersects the feedthrough trumpet in the plane of sense wire 4. The laser beam will first strike the guard wire trumpet. At 30 to 50 Hz, we can get ample statististics for a 2-min run at each setting. This is to be confirmed by the scalers.
x: along wire and y: vertical distance from sense wire 4.
Run -- BRICK OUT
o Move chamber horizontally to 5cm.
o Move chamber up 2mm
o Set: sense: +1375 to +1550V in steps of 25V field -688 to -775V in steps of 12.5V (12 or 13V) guard +688 to +775V in steps of 12.5V o Once we find the "sweet spot" fix settings of field, guard, and sense wires. Move chamber to +3mm, 2mm, 1mm, 0, -1mm, -2mm, -3mm.
Efficiency tests + charge/evt (canonical settings)
o Positions (reckoned in mm) x: 25, 20, 15, 10, 5, 0 ; y: 3, 2, 1, 0, -1, -2, -3.
Run -- BRICK IN (Thick as a brick)
o With the canonical settings. Positions (reckoned in mm) x: 50, 25, 0 ; y: 2, 0, -2,
SWAP METALICA and PLASTICA.
o Repeat measurements for efficiency and charge/evt.
Increase current into cell to see if we can see the second ionization peak in the first paddle.