Multi-Straw Prototype Detector Tension Measurements Oswaldo A. Lozoya University of Texas at El Paso.

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Presentation transcript:

Multi-Straw Prototype Detector Tension Measurements Oswaldo A. Lozoya University of Texas at El Paso

Straw Chamber The Straw Chamber is a detector whose wires pass through single straws, connected to a high voltage source. Inside the straw, two incoming wires are joined by a non- conductive glass fiber bead.

Straw Chamber cont’d Straw (cathode): Kapton - Al - Kapton (LR) layers; 4 mm diameter Wire (anode): Au-coated, 25-μm W wire

Straw Chamber vs. Wire Chamber Straw chamber has been chosen for the BTeV project for one main reason: functionality Broken wires

Straw Prototypes Two kinds: Single and Multi-Straw Certain tension in the wires is required for the detector to operate properly Prototypes have a single continuous wire, e.g. no glass fiber bead Resonant frequency  Tension

How to make a prototype

How to make a prototype cont’d

Theory In a vibrational approach, the wire represents a continuous system (many DOF’s) Due to its characteristics (tensioned and fixed), max amplitude  max power occurs at harmonic frequencies Wave interference and superposition Nodes and antinodes

Theory cont’d Governing equation: n = 1,2,3… f = harmonic frequency (Hz) T = tension (N)n = harmonic (1 st, 2 nd …) L = length of wire (m) μ = linear density of wire (kg/m)

Tension tests Function Generator (FG) An AC current is induced in the wire, located in a magnetic field When the wire is driven to resonance, the effect is perceived in an oscilloscope Current flow induction necessary (not possible in real detector due to wire discontinuity and bead insulation) Tone Generator (TG) The wire is connected to a constant potential source The straw-wire system resembles a cylindrical coaxial capacitor; Q=CV The wire is vibrated with a loudspeaker, and the power output is read and displayed in a computer (LabVIEW VI) for different frequencies No current needs to be induced; capacitance changes suffice

Tension tests cont’d Function Generator (FG)Tone Generator (TG)

TG Hardware / Software Hardware MSP / SSP Voltage source (~81 V) Amplifier Loud Speaker AC signal circuit Oscilloscope Tektronix TDS 350 Two channel, 200 MHz, 1 Gs/s Software Tone Gen 1.1 (LabVIEW) Generates tone Plots Power as function of frequency Resonance = Max Power

TG Hardware

TG Software: VI Panel

TG Software: VI Diagram

TG Setup

TG Setup cont’d

Experiments TG vs. FG Evaluate the difference between FG and TG readings 34 samples MSP used for such purpose Different tensions mean different frequencies TG accuracy Evaluate how consistent and accurate is TG 20 samples SSP used in the study Expected frequency known (approx. 250 Hz)

Results: TG vs. FG Mean = 1.80 Hz Std. Dev. = 1.23 Graph tends slightly more to a small difference, as shown Good news: both of them can be trusted in prototypes if they are right Fact: only TG can be used in real detectors!!

Results: TG accuracy Mean = Hz Expected ≈ 250 Hz Std. Dev. = 0.42 Good news: TG is working right!! TG is potentially useful for real detector

Conclusion TG is a trustworthy device for wire tension measurement, that can be used in the detector and prototypes The process has been speeded up, but must be faster if possible for real detector (80,000+ wires)