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High-energy cryomodules

cryomoduleSP2The SPIRAL-2 superconducting linac is composed of 2 accelerating cryomodule families.

In the low-energy section, the first family consists of 12 cryomodules housing a single β=0.07 cavity (CM-A).

In the high-energy section, taken in charge by the Accelerator Department of IPN Orsay, the second family is composed of 7 cryomodules housing two β=0.12 cavities (CM-B). All cavities are quarter wave resonators (QWR) operating at an RF frequency of 88.050 MHz, at a temperature of 4.2K and with a nominal accelerating field of 6.5 MV/m.


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The mass production of the 16 β=0.12 cavities designed by IPN was completed in late 2009. All cavities were tested and qualified successfully in vertical cryostat during the period 2008-2010 (Eacc>6.5 MV/m with less than 10W of cryogenic losses @4.2 K as shown here opposite). Several additional tests were also successfully accomplished to validate the performances of the dual-layer magnetic shield or of the the innovative plunger-based cold tuning system.

Finally, once the whole equipment required for the implementation of the six CM-B cryomodules was delivered in Orsay, cryogenic and RF tests were performed in 2010 and 2011 on the two first assembled cryomodules. These first tests didn’t allow to fully validate the requested performances, the gradient of 3 out of 4 cavities being less than 6.5 MV/m because of strong electronic field emission. Great efforts were made to identify, track, and correct all potential causes of pollution. The problem was finally solved after the test of a dedicated “hybrid” cryomodule performed in December 2011 and March 2012, that fully validated the assembly and preparation procedure in clean room. Since then, 4 series cryomodules have been delivered to GANIL in August 2013, October 2013, November 2013 and January 2014. The 2 remaining ones are to be delivered before en 2014.

A few related IPNO publications ...

SPIRAL2 cryomodules B tests results, Proc. SRF 2013

Status and challenges of the SPIRAL2 SRF linac, Proc. SRF 2013

Assembling, testing and installing the SPIRAL2 superconducting linac, Proc. IPAC 2013

Power couplers for SPIRAL2, Proc. SRF 2011

Status of the SPIRAL2 superconducting linac, Proc. IPAC 2010

SPIRAL2 cryomodules : status and first test results, Proc. SRF 2009

RF and cryogenic tests of the first beta 0.12 SPIRAL2 cryomodule, Proc. LINAC 2008

A novel frequency tuning system based on movable plunger for SPIRAL2 high-beta superconducting QWR, Proc. LINAC 2008

Test of wire sublimations very close to SPIRAL2 superconducting cavity, Proc. LINAC 2008

The SPIRAL2 superconducting linac, Proc. LINAC 2008

Status of the cryomodules and cavities development for the SPIRAL2 SRF linac, Proc. SRF 2007

Results of beta 0.12 QWR for radioactive beams production at SPIRAL2 facility, Proc. SRF 2007

Status of the cryomodules for the SPIRAL2 superconducting linac, Proc. PAC 2007

Test results of beta 0.12 QWR for the SPIRAL2 superconducting linac, Proc. LINAC 2006

Test results of the beta 0.07 and 0.12 QWR for the SPIRAL2 superconducting linac, Proc. EPAC 2006

Status of the beta 0.12 superconducting cryomodule development for the SPIRAL2 project, Proc. EPAC 2006

Development of a beta 0.12, 88MHz QWR and its cryomodule for the SPIRAL2 project, Proc. SRF 2005

Mechanical stability simulations on a QWR for the SPIRAL2, Proc. LINAC 2004

High-intensity linac driver for the SPIRAL2 project : design of a SC 88MHz QWR beta 0.12..., Proc. EPAC 2004

Design study of a 176MHz SRF HWR for the SPIRAL2 project, Proc. SRF 2003

Contact : Guillaume OLRY



Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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