SPEAR Storage Ring Parameters

Electron Energy E

3

3

GeV

Maximum Beam Intensity

100

500

mA

Horizontal Emittance (with IDs)

160

18

nm rad

Betatron Tunes (x,y)

7.18,5.28

14.19, 5.23

Nat. Chromaticity (x,y)

-12, -14

-22, -14

Critical Energy

4.8

7.6

keV

RF Frequency

476.300

MHz

RF Gap Voltage

1.6

3.2

MV

Synchrotron Tune

0.019

0.007

Momentum Compaction Factor

0.015

0.0011

RMS Energy Spread

0.07

0.1

%

Average Vacuum Pressure

1

1

nTorr< /b>

Harmonic Number

280

372

Lifetime × Beam Intensity

4

10

A-hr

RMS Beam Size (x,y) - ID

2.0, 0.05

0.43, 0.03

mm

RMS Beam Size (x,y) - Bend

0.79, 0.20

0.17, 0.05

mm

RMS Bunch Length

24

4.8

mm

RMS Bunch Duration

80

16

ps

Straight Sections

12×3.1

12×3.3

m

m

m