Cell Data Table

Last updated 04:00 – 03/27/03 js

Summary

Date	Cell	Style	Density	Sat. Pol.	Pol.	Lifetime	<Wall AB>	<Wall BA>	Win A	Win B
12/03/02	Proteus	Right IC	6.90	48.9%	42.6%	74
08/07/02	Patton	Right IC	6.97	~40%*	-	58
11/20/02	Phubar	Right IC	6.82	39.3%	37.3%	46
06/20/02	Prasch	Right IC	6.96	35.3%	32.0%	33

01/14/03	Priapus	40 cm	8.96			56
02/25/03	Penelope	40 cm	9.28			54
03/26/03	Powell	40 cm	9.25	39.0%	37.9%	25

This is the current list of cells that could be used in sGDH. All cells are made of C1720 by Mike Souza @ Princeton. Most numbers are from characterizations done at UVa.

All lifetime numbers have been corrected for AFP Loss if possible. Data is posted as it is taken.

The most up-to-date data & raw data can be attained by emailing me at (Jaideep Singh) js7uq@virginia.edu.

Polarization & Lifetime Data

Date	Cell	Style	Sat. Pol.	TC	Pol	Lifetime	RAW	He-He Dipole	“Wall”
12/03/02	Proteus	Right IC	48.9%	27.1 hrs	42.6%	74	70	108	236
08/07/02	Patton	Right IC	~40%*	-	-	58	53	107	127
11/20/02	Phubar	Right IC	39.3%	18.3 hrs	37.3%	46	44	109	80
06/20/02	Prasch	Right IC	35.3%	12.5 hrs	32.0%	33	32	107	48

01/14/03	Priapus	40 cm				56	53	83	172
02/25/03	Penelope	40 cm				54	54	80	165
03/27/03	Powell	40 cm	39.0%	12.7 hrs	37.9%	25	25	80	36

Saturation polarization & TC are from the fit of the spinup. Pol is the highest polarization measured via the EPR Freq shift method. Lifetimes are corrected for AFP losses.

The “RAW” numbers are from fits to exp. Decay w/o correcting for afp losses. The reason these two numbers are very close is b/c we intentionally make the avg time interval

between measurements very long to minimize the effect of the afp losses. He-He dipole is the theoretical maximum lifetime. “Wall” is the lifetime subtracting out the dipole interaction

Density Data (amg)

Date	Cell	He3 <Dens>	He3 D1	He3 D2	He3 <D1/D2>	He3 Fill	N2 Fill
12/03/02	Proteus					6.90	0.0920
08/07/02	Patton					6.97	0.0871
11/20/02	Phubar					6.82	0.0846
06/20/02	Prasch	6.96	6.96	6.96	6.96	6.96	0.0845

01/14/03	Priapus					8.96	0.0962
02/25/03	Penelope					9.28	0.0939
03/26/03	Powell					9.25

The fill numbers come from calculating the number of particles of gas put into the cell divided by the volume. The pressure broadening density is attained from fitting the Rb absorption lines at D1 – 795nm and D2 – 780nm to an asymmetric Lorentzian lineshape. From the fit we extract the width of the lineshape which is linearly proportional to the density of the perturbing gases in the cell. Broadening due to the Doppler effect, wall collisions, and collisions with other Rb atoms are tiny and therefore neglected. However, the raw data is corrected for the temperature of the cell and for the broadening due to collisions with N2. Each are <1% corrections. 1 amagat = 2.6e25 particles per cubic meter.

A Sample Pressure Broadening scan of Tilghman can be found here.

Cell Volumes (in cc)

Cell	Archimedes Internal	Fill Internal	Calculated Internal	Archimedes External	Calculated External	Pumping Chamber	Transfer Tube	Target Chamber
Proteus		235.0	234.1		276.7	91.1	3.38	140.4
Patton		250.8	250.7*		-	105.28	5.2*	140.3*
Phubar		247.2	252		297.5	102.5	4.42	142.7
Prasch		256.6	257.7*		-	114.3*	3.39*	139.5*

Priapus		207.7	195.4		252.4	114.2	4.04	83.3
Penelope		203.9	187.4		243.6	106.1	4.17	85.4
Powell		206.6				115.3	4.0	87.3

The volumes of the various chambers are calculated using a model and external dimension measurements. They are then scaled to sum to the volume as measured from the Archimedes volume method.

* denotes measurements made directly by Willie using methanol.

Cell Dimensions (in mm)

Cell

T2P

TTL

TTD

TCL

TCDA

TCDB

TCDC

TCDD

TCDE

<TCD>

Proteus

Patton

Phubar

Prasch

Priapus

Penelope

Powell

VD – vertical diameter of pumping chamber, equivalent to distance from top of pumping chamber to top of transfer tube

HD – horizontal diameter of pumping chamber

T2P – tipoff length, equivalent to distance from top of tipoff to top of pumping chamber

TTL – transfer tube length, equivalent to distance from bottom of pumping chamber to top of target chamber

TTD – transfer tube diameter

TCL – target chamber length, this is measured from tip of window to tip of window

TCDA – target chamber diameter on window tube

TCDB – target chamber diameter past window to main tube seal

TCDC – target chamber diameter past the transfer tube but before main tube to window tube seal

TCDD – target chamber diameter on opposite window tube

TCDE – target chamber diameter on the middle of the target chamber.

<TCD> - average target chamber diameter

“tops” and “bottoms” are arbitrary, however, every attempt is made to measure each cell using the same criteria for “top” and “bottom.

A diagram of this is shown above.

Wall Measurements (in mm)

Cell	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S
Proteus	0.6556	0.6121	0.6187	0.6069	0.6073	1.428	1.314	1.313	1.284	1.341	1.277	1.302	1.415	0.7113	0.7100	0.7115	0.7177	0.6915
Patton
Phubar
Prasch

Priapus
Penelope
Powell

(REF CELLS)
Proust	0.8622	0.8538	0.8382	0.8572	0.8487	0.8685	0.8688	1.147	1.250	1.177	1.178	1.083	1.014	1.111	1.190	1.436	0.8759	0.8874	0.8794
Pushkin	0.7997	0.8351	0.8223	0.8397	0.8434	1.308	1.373	1.286	1.392	1.363	1.302	1.339	0.8674	0.8997	0.8328

Pax

Window Measurements (in microns)

Cell	Label	Optical	Thin	Beam
Proteus	4	126.2	201.6	231.7
Patton
Phubar
Prasch

Priapus
Penelope
Powell

REF CELLS	Label	Optical	Thin	Beam
Proust		129.1	374.2	379.5
Pushkin	IX	155.8	249.0	258.9

Pax