熱場(chǎng)發(fā)射（FE）電鏡燈絲（電鏡用品）

Emitter Type

Thermionic

Thermionic

Schottky FE

cold FE

Cathode material

W

LaB6

ZrO/W (100)

W(310)

Operating temperature [K]

2,800

1,900

1,800

300

Cathode radius [nm]

60,000

10,000

< 1,000

< 100

Effective source radius [nm]

15,000

5,000

15 (*)

2.5(*)

Emission current density [A/cm2]

3

30

5,300

17,000

Total emission current [µA]

200

80

200

5

Normalized brightness [A/cm2.sr.kV]

1 x 10⁴

1 x 10⁵

1 x 10⁷

2 x 10⁷

Maximum probe current [nA]

1000

1000

10-100

0.2

Energy spread @ cathode [eV]

0.59

0.40

0.31

0.26

Energy spread @ gun exit [eV]

1.5-2.5

1.3-2.5

0.35-0.7

0.3-0.7

Beam noise [%]

1

1

1

5-10

Emission current drift [%/h]

0.1

0.2

< 0.5

5

Operating vacuum hPa/mbar1

<1 x 10^-5

<1 x 10^-6

<1 x 10^-9

<1x 10^-10

Typical Cathode life [h]

100

>1000

>5000

>2000

Cathode regeneration

not required

not required

not required

every 6 to 8 hours

Sensitivity to external influence

minimal

minimal

low

high

貨號(hào)

產(chǎn)品名稱

規(guī)格

YPS174

YPS熱場(chǎng)發(fā)射（FE）電鏡燈絲

個(gè)

YPS184

YPS熱場(chǎng)發(fā)射（FE）電鏡燈絲

個(gè)