Download presentation

Presentation is loading. Please wait.

Published byCori Golden Modified over 3 years ago

1
AGS CNI Update: Non-linear Corrections to Energy Loss in Si Dead Layer Outline Standard dead layer fitting technique Non-linear corrections Compare results of the two methods

2
Calculating Energy Loss Generate dE/dx as a function of carbon energy (E kin ) from MSTAR ver 2.00 Calculate energy loss tables for 150 < E kin < 2000 keV for dead layer thicknesses 20 < t dead < 100 g/cm 2 Carbon Energy (keV) dE/dx (keV cm 2 / g)

3
Standard Technique Fit linear correlation b/w E kin and E dep for 400 < E kin < 800 keV E kin = A + B E dep B 1 A E dead Fit Slope (B) as linear function of E dead (A) Slope = a + b E dead E kin = E dead + (a + b E dead ) E dep E dep E kin

4
Non-Linear Corrections Fit E kin to E dep correlation for different t dead E kin = P 0 + P 1 E dep + P 2 (E dep ) 2 + P 3 (E dep ) 3 + P 4 (E dep ) 4 P n (t dead ) depend on dead layer thickness Fit P n (t dead ) with 3 rd order polynomial P n (t dead ) = C n,0 + C n,1 t dead + C n,2 (t dead ) 2 + C n,3 (t dead ) 3 Now have 20 parameters rather than 2

5
Non-Linear Correction Results Extract T0 and t dead (E dead ) From TOF to E kin correlation First data set March 13 – standard fit –E dead = 70.6 keV t dead 21 g/cm 2 –T0 = 27.7 ns March 23 – non-linear fit –t dead = 34.2 g/cm 2 –T0 = 26.4 ns Second data set April 1 – standard fit –E dead = 63.4 keV t dead 19 g/cm 2 –T0 = 34.4 ns April 1 – non-linear fit –t dead = 31.2 g/cm 2 –T0 = 34.5 ns

6
Correction Effect on Polarization First data set March 13 – standard fit = 1.28% March 23 – non-linear fit = 1.26% Second data set April 1 – standard fit = 1.29% April 1 – non-linear fit = 1.28% (P non-linear – P standard ) / P standard April 1 data

Similar presentations

OK

Family of Functions, review Which functions are nonlinear? Select all that apply.

Family of Functions, review Which functions are nonlinear? Select all that apply.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on introduction to object-oriented programming languages Ppt on condition of girl child in india Ppt on power grid corporation of india limited Ppt on steps in planning Ppt on environmental protection act Ppt on communication Ppt on eisenmenger syndrome causes Ppt on renewable energy for today and tomorrow daily encouragement Download ppt on home security system Ppt on media research methods