SLAC, HiRes T-461: “FLASH” part 1 Justin Findlay.

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Presentation transcript:

SLAC, HiRes T-461: “FLASH” part 1 Justin Findlay

Apparatus

Data: ntuple Run Event Type: event type N e - : number of electrons n: blind north PMT N: signal north PMT s: blind south PMT S: signal south PMT Pressure Temperature hV: high voltage Flow: gas flow Mixture: gas mixture Quality: event quality NL: signal PMTs’ SL, nearest LED event Np: each PMT’s Np, nearest pedestal sp Sp

Data: runs

Cuts: high voltage beforeafter

Cuts: LED before

Cuts: LED after S bar LED N bar LED

Data Reconstruction Subtract pedestal Correct PMT gain wander Extrapolate from LED events to all events Convert blind PMT gain to signal PMT gain Subtract background measured by blind PMT

Cuts: signal PMT correlation Blue: non-ethylene data Black: ethylene data

Cuts: N e - per  linearity, air

Cuts: N e - per  linearity, N 2

Yield

Yield: function Y: yield C: constant  0 ∙ and p’: represent wavelength specific constants p: pressure

Yield: fit, air

Yield: fit, N 2

Yield Still need to incorporate errors propagated  2 / N df too large for result to be reliable Try for the principal lines

Systematic Error Account for systematic biases and failings - PMT Gains - Pedestals / Data Acquisition System - Beam Monitor - Temperature - Pressure

The End

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