TABLE III.

Comparison of the ratio ϒ of the volume of the homogeneous field region to that of the device itself from various designs of the magnetostatic cavities. The dimensions are a diameter Ø and length l for the mu-metal assembly of cylinder body and end caps for a MSS, and a width w, height h and a length l for a magic box. d_h and l_h are the diameter and length of the cylinder of the homogeneous field region. The data of the magnetostatic cavity devices of the last 6 rows are from other labs.

cavity name	cavity type	dimensions cm × cm	ϒ	instrument class	P or A	dh × lh cm × cm	$\mid \overrightarrow{\nabla }{B}_{\perp }∕B\mid$ 10−4 cm−1
Gemini	solenoid	25.4 × 35.6	0.064	TAS/SANS26	analyzer	12 × 10	2.8 ± 0.1
Kronos	solenoid	20.3 × 25.4	0.14	TAS/SANS25	polarizer	12 × 10	6.0
Venus	solenoid	25.4 × 33	0.061	SANS	analyzer	12 × 9	4.4 ± 0.2
Honesty	solenoid	27.9 × 35.6	0.055	Reflectometer27	analyzer	13 × 9	3.7 ± 0.2
Nyx	solenoid	25.1 × 29.2	0.078	TAS	polarizer	12 × 10	4.2 ± 0.2
Flattop	magic box	40 × 15 × 28.4	0.066	TAS17	polarizer	12 × 10	5.7 ± 0.4
	solenoid24	27.2 × 36.4	0.037		polarizer	10 × 10	<4.0
	solenoid	30 × 46	0.024	TAS21	analyzer	10 × 10	2.0
	solenoid	9.5 × 20	0.030	SCD10	polarizer	3 × 6	45.0
	solenoid	20 × 30	0.030	POLANO23	polarizer	6 × 10	<10.0
	magic box	20 × 40 × 78	0.015	TOPAS35	polarizer	12 × 8	4.4
	magic box	30 × 40 × 62	0.012	MARIA35	analyzer	12 × 8	<2.0
	magic box18	40 × 17× 80	0.005			6 × 10	<2.0
	solenoid19	33 × 96	0.003			8 × 8	<1.0