ASTRID is a small (40 m circumference) dual purpose storage ring which has been in operation since 1990.

In electron-mode it operates as a 580 MeV electron storage ring, injected from a 100 MeV racetrack microtron.

In ion-mode, many types of ions in different charge states can be stored, injected from either a 150 keV electrostatic ion accelerator or an EBIS ion source. Ions can then be accelerated further in the ring with the maximum attainable energy determined by the rigidity of the dipoles. The maximum energy for a mass of 1amu is about 165 MeV. Ions of both polarities ranging from mass 1 (Hydrogen atom) to mass 840 (Carbon 70 cluster) have been stored.

Parameters

Racetrack microtron:

Parameter	Value
Maximum energy	100 MeV (19 turns, 5.3 MeV steps)
Pulse current	10 mA
RF	2.9986 GHz
Pulse length	1 microsecond
Max repetition frequency	10 Hz
Energy spread	0.1 MeV
Emittance	0.1 mm mrad
Dipole field	1.13 T

Storage Ring:

Electron Mode:
Parameter	Value
Maximum Energy	580 MeV
Max Current (2005) Without narrow undulator chamber	286 mA
Typical Stored Current	180-220 mA
Lifetime (at 150 mA)	100-120 hours
Horizontal emittance	0.16 mm mrad
RF Frequency	104.9 MHz
No. of bunches	14
SR critical energy	0.38 keV
Dipole rigidity	1.9 Tm
Quadrupole max gradient	6.7 T/m
Ion mode:
Parameter	Value
Injection energy	5-150 keV
RF frequency	0.3-5.0 MHz
Vacuum:
Parameter	Value
Ion pumps	20
Sublimation pumps	24
Pressure (ion beam, typ)	2.5 x 10-11 torr
Pressure (electron beam, typ)	1 x 10-10 mbar

Last Modified 29 March 2010