CRYRING@ESR - Facility for Antiproton and Ion Research

26 Chapter 6. Proposed Construction Cycle
• Six quadrupole magnets (types SQ010-SQ030), and
• Two H/V steering magnets.
All magnets are components of the beam distribution system behind the UNILAC designed for
a maximum magnetic rigidity of 4.4 Tm. Hence they are well suited for the maximum value of
1.44 Tm rigidity of the beam from the ESR. It should be noted that the power consumption will
be below 10% of the nominal values and the required amount of cooling water is correspondingly
small.
6.6.2 Power Converters
Power converters will have to be made available for all magnets of the two injection beam lines.
Fortunately all required supplies are available at GSI, except a pulsed 2940 A supply for the
injection septum magnet which has to be purchased from an industrial company. It is necessary
for the injection of ions from the ESR at the maximum magnetic rigidity of 1.4 Tm.
The power supplies for all ring and electron cooler magnets shall be reinstalled on the concrete
cover of the new cave. The peak power of about 2.6 MVA for the operation of CRYRING with a
ramp rate of 7 T/s requires a corresponding intermediate 20/10.5 kV transformer, if the existing
oil-filled 10.5 kV/880–400 V transformer for silicon controlled rectifiers SCR application is used.
The alternative solution of a new 20 kV/880–400 V dry transformer for SCR will be investigated
later.
6.6.3 Beam Diagnostics
From the discussion with MSL colleagues it is clear that the beam diagnostic equipment will
not be ready for use ‘out of the box’, because of several reasons.
• Data acquisition systems were in most cases purpose-built by MSL experts and GSI will
not be able to service and maintain the devices.
• Often the applied techniques are somewhat outdated (e.g. PC interfacing for residual gas
ionization profile monitor) and will have to be renewed for future usability.
• In general, the degree of control system integration is relatively low: only Faraday-cups
and scintillating screens have interfaces to the control system at MSL.
As a consequence, more or less the complete data acquisition part of the diagnostic systems has
to be renewed, whereas the detectors and mechanics would remain unchanged wherever possible.
Additionally, it is emphasized that no spare parts exist for the diagnostic components, which
introduces some risk for future operation of the devices.
It has to be mentioned that the replacement of the existing data acquisition (DAQ) systems
with state-of-the-art techniques will consume the major part of the man power required for the
commissioning of CRYRING beam diagnostics at GSI. The renewal of the DAQ is a project
in its own and requires manpower for technical coordination, for adaptations of the existing
hardware (digital and analog electronics), as well as for programming DAQ software.
6.6.4 Radio-Frequency Components
108.48 MHz RFQ and debuncher The 108.48 MHz end stage for the RFQ accelerator requires
a new 2–5 kW solid state driver amplifier. The same type can be applied also to operate the
debuncher cavity to reduce the momentum spread of the 300 keV/u RFQ beam from ±1% to
±0.5% in order to increase the efficiency of multiturn injection to CRYRING.
Wideband drift tube The present wideband generator for the drift tube accelerating gap of
CRYRING allows a dipole ramp rate of 1 T/s for acceleration or deceleration in the frequency