Abstracts Brochure - CERN

MOPCH — Poster Session 26-Jun-06 16:00 - 18:00
First Cool Down of the Juelich Accelerator Module Based on Superconducting Half-wave
Resonators
In the context of upgrading the existing proton
and deuteron accelerator facility COSY at F.M. Esser, B. Laatsch, R. Stassen (FZJ) R. Eichhorn (TU Darmstadt)
the Forschungszentrum Juelich, an accelerator
module based on superconducting half wave resonators is prototyped. Due to beam dynamics, the requirements
of cavity operation and a top-loading design for mounting, the cryostat had to be designed very compact and with
a separate vacuum system for beam and insulation vacuum. These restricted requirements lead to very short coldwarm
transitions in beam port region and to an unconventional design regarding to the shape of the cryostat vessel.
This paper will review the design constraints, gives an overview of the ancillary parts of the module (cavities, tuner,
etc.) and will present the results of the first cool-down experiments. Furthermore the future work will be presented.
Key Cryogenics Challenges in the Development of the 4GLS
The fourth generation light source (4GLS) is a
uniquely flexible source of ultra-high brightness
continuous and pulsed radiation covering
the IR to XUV range of the spectrum. It
R. Bate, R.K. Buckley, A.R. Goulden, C. Hodgkinson, S.M. Pattalwar
(CCLRC/DL/ASTeC)
is the first light source in the world that is planned from the outset to be a multi-user, multi-source facility combining
ERL (energy recovery LINAC) and FEL (free electron laser) technology. 4GLS will require six different sets of
superconducting LINACs. Each of the LINAC modules consists of 2 to 7, 1.3 GHz superconducting RF cavities of the
TESLA design operating at 1.8 K. The overall cooling power necessary to cool the cavities is estimated to be around
2.5KW demanding the superfluid liquid helium flow rates in excess of 200g/s. Even though the technology of the
superconducting RF cavities is somewhat well understood, the design and subsequent operation of the cryogenic
system / Cryo modules is an extremely complex task. In this paper we describe the key cryogenic challenges of the
4GLS project and our approach in identifying solutions to meet them.
Overview of the Cryogenics of the ERLP
The Energy Recovery LINAC Prototype
(ERLP) under construction at the CCLRC
Daresbury laboratory UK, serves as a testbed
for the study of beam dynamics and ac-
R. Bate, R.K. Buckley, A.R. Goulden, S.M. Pattalwar (CCLRC/DL/
ASTeC)
celerator technology important for the design and construction of the proposed 4th Generation Light Source (4GLS).
Major components of the prototype machine include two 1.3GHz 9-cell superconducting RF cavities operating at 1.8
K. The cryomodules are of the FZR (Rossendorf) design, which utilise TESLA SRF cavities. The overall 1.8K dynamic
heat load in the SRF cavities is around 200W, which is being serviced by a ’2K’ cold box consisting of a JT valve,
recuperator and an external room temperature pumping system. The key issue will be to handle the change in the
superfluid helium flow rate from less than 1g/s to around 15 g/s while achieving the required temperature and
pressure stability in the SRF cavities. In this paper we present an overview of the ERLP cryogenics system.
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