A Comment about WireCell vs 2 D Approach

A Comment about Wire-Cell vs. 2 D Approach • Track/Shower charge in 3 D hits in 2 D • The goal of the reconstruction is to figure out the correct association of the 2 D hits to 3 D objects • Wire-Cell Imaging basically tells us which hits CANNOT be associated together – Hits from different time slice CANNOT be associated together – Hits with “different” charge is UNLIKELY to be associated together – Track/Shower hypothesis not used yet • If you CANNOT see by your own eye, why do you expect software can solve it?

Noise Comparison Argon. Tube Micro. Boo. NE 14 m. V/f. C + 2 us Low Freq: 1200 High Freq: 100? Low Freq: 200 High Freq: 50?

Run 9188 Event 221

Run 9188 Event 213

Run 9188 Event 211

Run 9188 Event 20

Run 9188 Event 18

Run 9188 Event 172

Run 9188, Event 158

Run 9188, Event 149

Web link • http: //lheppc 91. unibe. ch/Exchange/ARGONT UBE/Event_Display/Run 9188 -v. swf

Garfield Simulation for Argon. Tube • A single electron is set 10 cm away from the wire plane • V 3, Y 3 is the central wire • Signal is calculated for the next 3 wires on each plane on both side • The starting point of the electron is set 0, 0. 3, 0. 6, 0. 9, 1. 2, 1. 5 mm away horizontally. 10 cm 3 mm Induction wire(0 V) V 1 V 2 V 3 V 4 V 5 U 6 U 7 Y 1 Y 2 Y 3 Y 4 Y 5 Y 6 Y 7 Collection wire(+100 V) 3 mm

Simulated Results vs. Tuned Field Response

Use Tuned Response Function

Use Garfield Response Function Signal Disappeared …

Why? Look at the Raw Waveform

Scaled Down the Positive Half

Raw Waveform Again

Garfield-based Tuned Response

Use Tuned Response Function

Event 213 (Garfield)

Event 213 (Tuned)

Event 211 (Garfield)

Event 211 (Tuned)

Event 20 (Garfield)

Event 20 (Tuned)

Event 18 (Garfield)

Event 18 (Tuned)

Event 172 (Garfield)

Event 172 (Tuned)

Event 158 (Garfield)

Event 158 (Tuned)

Event 149 (Garfield)

Event 149 (Tuned)

Discussion • Garfield-based tuned field response is longer in time (slower drift velocity) – Deconvoluted signal is sharper • Noise level seems to be smaller with Garfieldbased field response • Note: filter function was not tuned for these kind of long signal

Summary • Deconvolution can recover the signal for tracks close to perpendicular to the wire plane for the Argon. Tube data • Garfield simulated response function does not totally match with data • Noise level in Argon. Tube is higher than Micro. Boo. NE? (Need to understand the Gain/Shaping Time Setting) 46