Offline-2 is an entirely new laboratory for the Isolde facility, to serve a wide range of R&D needs. Whilst the existing off-line lab is sufficient for target conditioning and for limited ion-source developments, it is now rather old and not always suitable for testing and development of more sophisticated target units. In addition there is an increasing need for beam dynamics studies, which the older off-line separator is entirely unsuitable for. Including infrastructure the new laboratory represents an investment of roughly 1M CHF.
The new separator comprises a standard Isolde frontend (target handling and beam-preparation system), so beam conditions are extremely realistic. After the separator magnet there is a matching section and an RFQ beam-cooler. The cooler is similar to the on-line cooler, and will permit a wide range of cooler upgrades to be studied including longitudinal emittance studies, alternative beam-capture schemes, and improved buffer-gas distribution inside the RFQ volume. After the RFQ there is a transverse emittance meter, and space for other advanced beam instrumentation including time profiling detectors and energy spread measurement (see abstract #104).
In general modifications to the on-line facility are difficult and risky, and with Offline-2 for the first time we will have a general-purpose test-bed to validate new equipment and new designs under realistic conditions prior to installation. A major project which will benefit from this is the planned replacement and upgrade of the Isolde GPS and HRS frontends.
Offline-2 will be ideal for development of ambitious new targets and ion-sources. It will allow for much more comprehensive testing before taking a prototype on-line, reducing failure risks and minimising the proton beam-time needed. A dedicated laser laboratory will allow far more laser-ionisation studies to be carried out, including work that currently has to be done with the on-line facility.
The infrastructure of the Offline-2 lab is now complete and commissioning of the source, separator and RFQ has started. We will present the measurements of the first beams, the construction status, and discuss plans for the exploitation of this new laboratory.