Main accelerating section includes two Superconducting RF (ELBE) module and one magnetic bunch compressor located between them. The first module will capture the beam coming from injector at 250 keV and accelerate up to 20 MeV. Depending on the application the electron bunches will be compressed or de-compressed in the bunch compressor and the second cryomodule will accelerate the electrons to the required energy and reduce the energy spread of bunches. TARLA beamline has been designed to achieve minimum bunch length at maximum beam energy. In case longer bunch length is required, there will be decrease in energy. Each superconducting RF (SRF) module consists of two TESLA cavities. The cryostat and mechanical tuning system has been designed for ELBE. Research Instruments GmBh (RI) has the manufacturing license agreement of superconducting RF modules with HZDR (Helmholtz Zentrum Dresden Rossendorf). RI manufactured the SRF modules with some minor modifications
for TARLA project. Cooling of the superconducting cavities from ambient temperature down to the operation temperature of 1.8 K is obtained with liquid helium. ELBE designed cryomodule***

Table: Basic Parameters of SRF module

Cavity frequency at 2K 1300.0 MHz ± 0.05 MHz
Tuning range ±120 kHz
External Q of input couplers (optimized for operation at 1 mA beam current) (1.2 ±0.2) x 107
External Q of HOM couplers > 5x1011
Stand by losses of cryostat < 15W
Total accelerating voltage of the module > 20 MV
Dynamic losses at 20 MV cw operation < 60W
Total cryogenic losses at 20 MV cw operation < 75W
Power coupler performance (standing wave) ≥ 8 kW

References :

*Radiation Source ELBE –

**The technical design report of TARLA (2. version)

*** Research Instruments GmBH /


Contact Person : Özlem KARSLI (