Plots from RCNP UCN Run

(April 20-25, 2010)

EDM Set-up SchematicH0

(RF) H1

Spin Flipper

RF Coil

Spherical Coil

Cell Valve

EDM Cell

Magnetized Foil

Rotary Valve(2-way)

UCN Valve

UCN Detector

Spin Precessor

UCN Storage Time in EDM Cell

UCN Yield vs Delay-time (before opening cell valve)

Spin-Flipper Optimization

(Find optimal amplitude for Spin Flipper B-field)

Flipping Asymmetry vs B-field Amplitude

Polarization Lifetimes (T1)

“Flipping Asymmetry” as a function of Holding Time

UCN-Yield Time Spectra (-100mG)

Polarization Lifetimes (T1)

“Flipping Asymmetry” as a function of Holding Time

UCN-Yield Time Spectra (-10mG)

Scan for Resonant Frequency at -100 mG

UCN-Yield versus RF Frequency of H1 field

“Single Shot” pulse

Scan for Resonant Frequency at -100 mG

UCN-Yield versus RF Frequency of H1 field

Blue: H1 ~ 1 mGRed: H1 ~ 10 mG

“Single Shot” pulse

Optimizing Amplitude (H1) for RF coil

UCN-Yield versus Amplitude of H1 Field

“Single Shot” pulse

Ramsey Resonance Scan (-100 mG, Tc=1s)

Ramsey Frequency Scan (H0~ -100mG, TC~1s, H1~1mG, ~100ms)

Aside#1: Definition of ParametersRamsey Frequency Scan

H0 Holding Field (vertical)H1 Amplitude of RF Field (horizontal) Duration of RF pulse [want = H1]TC Time between ( RF pulses

TCH1

Aside#2: “Visibility”Ramsey Frequency Scan

“Visibility” ~ Ampl. Of Fringe/Ampl of Envelope (AF / AE )

Ideally (AF / AE ) ~ 1

AFAE

Ramsey Resonance Scan (-100 mG, Tc=1s)

Ramsey Frequency Scan (H0~ -100mG, TC~1s, H1~1mG, ~100ms)

Ramsey Resonance Scan (-100 mG, Tc=5s)

Ramsey Frequency Scan (H0~ -100mG, TC~5s, H1~1mG, ~100ms)

Ramsey Resonance Scan (-100 mG, Tc=10s)

Ramsey Frequency Scan (H0~ -100mG, TC~10s, H1~1mG, ~100ms)

Visibility Study of Ramsey Scans

Ramsey Oscillation Amplitude vs TC (Precession Time)

Ramsey Resonance Scan (-100 mG, Tc=1s)H1 is 10 times smaller

Ramsey Frequency Scan (H0~ -100mG, TC~1s, H1~0.1mG, ~1s)

Ramsey Resonance Scan (-100 mG, Tc=1s)H1 10 times smaller

Ramsey Frequency Scan (H0~ -100mG, TC~1s, H1~0.1mG, ~1s)

Scan for Resonant Frequency at -50 mG

UCN-Yield versus RF Frequency of H1 field

“Single Shot” pulse

Scan for Resonant Frequency at -10 mG

UCN-Yield versus RF Frequency of H1 field

“Single Shot” pulse

Scan for Resonant Frequency at +10 mG

UCN-Yield versus RF Frequency of H1 field

“Single Shot” pulse

Polarization Lifetime (T1) at low H0 Fields

Flipping Asymmetry vs Holding Time (at 10mG)

Scan for Resonant Frequency at +50 mG

UCN-Yield versus RF Frequency of H1 field

“Single Shot” pulse

Scan for Resonant Frequency at -20 mG

UCN-Yield versus RF Frequency of H1 field

“Single Shot” pulse

Flipping Asymmetry vs H0 (Main Holding Field)

Scan for Optimal H0 (where T1 is still reasonable)

Flipping Asymmetry vs H0 Field

-20 mG still looks OK

(B/z) Trim Coil study

TC vs Trim Current

Ramsey Frequency Scan (Trim~0.035A, TC~1s)

(B/z) Trim Coil study

TC vs Trim Current

Ramsey Frequency Scan (Trim~0.035A, TC~10s)

(B/z) Trim Coil study

TC vs Trim Current

Ramsey Frequency Scan (Trim~0.035A, TC~3s)

(B/z) Trim Coil study

Trim Current comparison TC ~3s

Ramsey Frequency Scan (TC~3s)

Better Results with Trim Coil OFF !!

Ramsey Resonance Scan (-20 mG, Tc=3s)

Ramsey Frequency Scan (H0~ -20mG, TC~3s, H1~0.33mG, ~300ms)

Ramsey Resonance Scan (-20 mG, Tc=10s)

Ramsey Frequency Scan (H0~ -20mG, TC~10s, H1~0.1mG, ~1s)

Ramsey Resonance Scan (-20 mG, Tc=20s)

Ramsey Frequency Scan (H0~ -20mG, TC~20s, H1~0.05mG, ~2s)

Optimizing Amplitude (H1) for RF coil

UCN-Yield versus Amplitude of H1 Field

Ramsey Resonance Scan (-20 mG, Tc=30s)

Ramsey Frequency Scan (H0~ -20mG, TC~30s, H1~0.1mG, ~1s)

Ramsey Resonance Scan (-20 mG, Tc=30s)

Ramsey Frequency Scan (H0~ -20mG, TC~30s, H1~0.1mG, ~1s)

“ZOOMED IN”

Ramsey Resonance Scan (-20 mG, Tc=50s)

Ramsey Freq. Scan (H0~ -20mG, TC~50s, H1~0.1mG, ~1s)

“Zoomed In”(any fringes?)(BG subtraction?)

“Zoomed Out”(baseline, amplitude?)

Ramsey Resonance Scan (-20 mG, Tc=40s)

Ramsey Freq. Scan (H0~ -20mG, TC~40s, H1~0.1mG, ~1s)

“Zoomed In”(any fringes?)(BG subtraction?)

“Zoomed Out”(baseline, amplitude?)

Polarization Lifetime (T1) at H0~ -20mG

Flipping Asymmetry vs Holding Time

These points should be decreasing, if anything.(BG subtraction needed? Also, Stats getting worse as Holding Time UCN Storage Time)