Cryomodule Design for A Superconducting Linac with Quarter-Wave, Half-Wave and Focusing Elements

Johnson, M.; Bierwagen, J.; Bricker, S.; Compton, Chris; Glennon, P.; Grimm, Terry; Hartung, W.; Harvell, D.; Moblo, A.; Popielarski, John; Saxton, L.; York, R. C.; Zeller, A. F.

doi:10.1109/pac.2005.1591807

Cited by 3 publications

(3 citation statements)

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“…In addition, the magnetic field at the niobium surface of cavities for both systems is rather high, on the order of 0.01 T, which makes it difficult to justify use of these or similar devices in our case. At MSU, an 80 MHz accelerating system also employs a 9 T focusing solenoid fabricated by Cryomagnetics, Inc [9]. Here significant attention was devoted to shielding issues.…”

Section: Historymentioning

confidence: 99%

Designing Focusing Solenoids for Superconducting RF Accelerators

Davis

Kashikhin

Page

et al. 2007

IEEE Trans. Appl. Supercond.

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Abstract-The design of a focusing solenoid for use in a superconducting RF linac requires resolving a range of problems with conflicting requirements. Providing the required focusing strength contradicts the goal of minimizing the stray field on the surfaces of adjacent superconducting RF cavities. The requirement of a compact solenoid, able to fit into a gap between cavities, contradicts the need of mechanical support necessary to restrain electromagnetic forces that can result in coil motion and subsequent quenching. In this report we will attempt to address these and other issues arising during the development of focusing solenoids. Some relevant test data will also be presented.

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Section: Historymentioning

confidence: 99%

Designing Focusing Solenoids for Superconducting RF Accelerators

Davis

Kashikhin

Page

et al. 2007

IEEE Trans. Appl. Supercond.

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“…Active and passive magnetic shielding is implemented, consisting of reverse wound coils at the ends of the solenoid, a Meissner shield (Nb can) around the solenoid, and µ metal shields around the Meissner shield and the cavities. Additional information about the low-β prototype cryomodule design can be found in a separate paper [7]. Some preliminary results of the cryomodule test have also been reported previously [8].…”

Section: Introductionmentioning

confidence: 82%

RIA Superconducting Drift Tube Linac R & D

Popielarski¹,

Bierwagen²,

Bricker³

et al. 2009

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Cavity and cryomodule development work for a superconducting ion linac has been underway for several years at the National Superconducting Cyclotron Laboratory. The original application of the work was the proposed Rare Isotope Accelerator. At present, the work is being continued for use with the Facility for Rare Isotope Beams (FRIB). The baseline linac for FRIB requires 4 types of superconducting cavities to cover the velocity range needed to accelerate an ion beam to ≥ 200 MeV/u: 2 types of quarterwave resonator (QWR) and 2 types of half-wave resonator (HWR). Superconducting solenoids are used for focussing. Active and passive shielding is required to ensure that the solenoids' field does not degrade the cavity performance. First prototypes of both QWR types and one HWR type have been fabricated and tested. A prototype solenoid has been procured and tested. A test cryomodule has been fabricated and tested. The test cryomodule contains one QWR, one HWR, one solenoid, and one super-ferric quadrupole. This report covers the design, fabrication, and testing of this cryomodule.

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“…If RF superconducting structures are used for acceleration, the focusing lens, which is usually located between accelerating cavities, is often comprised of a main coil and two bucking coils that are used to reduce the fringe field of the lens to the level that permits further shielding with the use of magnetically soft alloys, as it was suggested in [2] and [3]. The front end of an H¯ RF accelerator under development at FNAL for the High Intensity Neutrino Source (HINS) project makes use of three types of accelerating sections that employ solenoids for beam focusing [4].…”

Section: Introductionmentioning

confidence: 99%

Normal Zone Propagation in Superconducting Focusing Solenoids and Related Quench Protection Issues

Terechkine

Veretennikov

2008

IEEE Trans. Appl. Supercond.

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Abstract-Superconducting solenoids are increasingly used as focusing lenses in transport channels of proton linear RF accelerators. If these accelerators employ superconducting RF cavities, each focusing lens is usually comprised of three coils connected in series: a main coil, which provides the needed focusing strength, and two bucking coils, that help to reduce magnetic field outside the lens.When a normal zone develops in any of the coils in a focusing lens, it propagates with a direction and a rate which depends on the coil and the specific part of the coil in which the quench first occurred. As a result of this propagation process (quenching), the temperature and/or voltage of parts of the lens can exceed safe limits, thus compromising lens reliability. On the other hand, the negative impact of quench events can be significantly mitigated if an external resistor is used to absorb a part of the energy stored in the magnetic field. This paper presents the main results of a solenoid quench protection study based on computational modeling of normal zone propagation in solenoid lenses being built for a superconducting linear RF accelerator under development at Fermilab.

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Cryomodule Design for A Superconducting Linac with Quarter-Wave, Half-Wave and Focusing Elements

Cited by 3 publications

References 1 publication

Designing Focusing Solenoids for Superconducting RF Accelerators

Designing Focusing Solenoids for Superconducting RF Accelerators

RIA Superconducting Drift Tube Linac R & D

Normal Zone Propagation in Superconducting Focusing Solenoids and Related Quench Protection Issues

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