MOT

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Cell

1.5in windows

Ron Bihler cell

Y-shaped source tube with 8 dispensers

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Dispensers

• 4x Alvatec enriched 40K
• 2x Alvatec Rb
• 1x Alvatec Cs
• 1x Alvatec natural abundance K

note:
1) Alvatec dispensers work by sublimation, SAES by chemical reaction.
2) For Alvatec sources, the current necessary to reach the activation threshold is therefore pressure dependent (think PV=nRT). If we are running the dispensers in a higher pressure environment, a greater temperature - or current - will be needed to evaporate the metal.
3) Alvatec sources are cleaner than SAES sources (see pg 7 of Alvatec data sheet)

Dispenser map

Dispenser resistances

These resistances are between the dispenser lead and the center pin lead.

Dispenser	R ($m\Omega$)	Status
enriched 40K #1	215	Alive
enriched 40K #2	209	Alive (but waterlogged?)
enriched 40K #3	216	Dead
enriched 40K #4	206	Dead
Rb #1	222	?
Rb #2	214	?
Cs	206	Dead
39K	224	Alive

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Optics

note: take care to make sure counter-propogating beams have the same path length so that the beam profile of each is balanced.

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Magnetic Gradient Coils

Measured by Mike Yee (in his thesis, pg. 38) @ I=4.64A

Gx	2.69G/cm	0.58G/cm/A
Gy	2.69G/cm	0.58G/cm/A
Gz	4.8G/cm	1.03G/cm/A

Polarization

Using the "Dylan Circular Polarization Tool" the side windows should be bright and the vertical should be bright.

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Laser Power

Date	Repump Power (before fiber)	Repump Power (after fiber)	Repump Power (before TA)	Repump Power (before final AOM)	Repump TA current	Trap Power (before fiber)	Trap Power (after fiber)	Trap Power (before TA)	Trap Power (before final AOM)	Trap TA current
20/10/2009	300mW	176mW	8.75mW	715mW	2.14A	300mW	186mW	16.4mW	750mW	2.22A
05/11/2009						310mW		14.6mW	-	2.2A
6/4/2010	515mW	185mW	9mW	715mW	2.14A	340mW	200mW	15.8mW	700mW	2.20A