srf test infrastructure in europe w. weingarten with o. brunner, s. calatroni, b. vullierme (cern)...

SRF Test Infrastructure in Europe

W. Weingarten with O. Brunner, S. Calatroni, B. Vullierme (CERN) and

R. Eichhorn, E. Elsen, D. Gardès, J. Knobloch, G. Müller, R. Seviour, S. Tazzari, A. Ustinov

Proposed acronym:

Superconducting RF Test Collaboration = SuRFTeC

ESGARD-OMIA-meeting-CERN 111 Sep 2007

OUTLINE

ESGARD-OMIA-meeting-CERN 2

Main Objectives of facility Collaboration of Participating Laboratories and

Institutes Focus of equipment available in SRF test

collaboration Proposed investment in central and complementary

infrastructures Items proposed for testing in Central Infrastructure Conclusion and outlook

11 Sep 2007

Main Objectives of facility

ESGARD-OMIA-meeting-CERN 311-Sep-2007

Setting up for European accelerator users a multi-purpose state-of-the art network of installations for R&D and test of superconducting radio-frequency cavities and cryo-modules; this network will be:

organized as a collaboration consisting of a basic central infrastructure hosted at CERN and complemented by specific equipment elsewhere;

operated in shared responsibility between the host laboratories for the (recurrent) non-project specific running costs and the user collaborations for the (ad-hoc) specific project costs;

with the aim of

providing an infrastructure for the maintenance and tests of SRF cavities of existing facilities and the development of SRF cavities for new facilities,

pushing the SRF technology performance limits,

training a new generation of accelerator experts in the field of SRF, and

facilitating a continuous technology transfer to industry.

3ESGARD-OMIA-meeting-CERN

Main Objectives of facility (2)

This proposal provides a necessary test bed for CERN projects and other projects elsewhere in Europe using SRF technology. The SRF infrastructure therefore complements these projects, some of which request financial support within the FP7 program:

The development and test of SRF cavities and other components for the Superconducting Proton Linac SPL to upgrade and partially replace the injector chain for the LHC (CERN);

The validation by RF power tests of the cryo-module prototypes for the proposed International Linear Collider ILC (DESY and associated institutes);

The RF tests of the quarter wave cavities to be used for post acceleration of the radioactive ions for a future EURISOL facility (CERN and associated institutes);

The identification of field emission sites on technical surfaces as used for SRF cavities (Universität Wuppertal);

The development of niobium thin films by alternative methods other than sputter coating and their validation under RF exposure at low temperature (INFN Roma 2);

The development of a laser scanning microscope for identifying defects under RF exposure at low temperatures (Universität Erlangen/Nürnberg).

4ESGARD-OMIA-meeting-CERN11 Sep 2007

Main Objectives of facility (3)

Other projects under consideration based on the SRF technology and planned to use the SRF test infrastructure as backup, are the following:

The planned Free Electron Laser STARS (BESSY);

The 4th generation light source using an Energy Recovery Linac and prototyping cavities for a future neutrino factory (Cockroft Institute);

The SPIRAL-2 at GANIL heavy ion accelerator, the SOLEIL synchrotron light source, and the proton linac for Accelerator Driven Systems ADS (Supratech consortium).


Collaboration of Participating Laboratories and Institutes


Institute Acronym Country Berliner Elektronenspeicher ring-Gesellschaft

für Synchrotrons trahlung BESSY D

Bergische Universität Wuppertal BUW D European Organizat ion for Nuclear Research CERN CH

Cockroft Institute Daresbury CI GB Deutsches Elektronen Synchrotron Hamburg a) DESY D

INFN Roma 2 and University of Roma Tor Vergata INFN Roma I Supratech Consortium (LAL Orsay, IPN Orsay,

CEA Saclay) Supratech F

Technische Universität Darmstadt, Institut für Kernphysik

TUD D

Universität Erlangen/N ürnberg UEN D a) Equipment made available to consortium has to be defined


Focus of equipment available in SRF test collaboration


Laboratory Equipment

BESSY HoBiCaT test facility for high and low power operation of fully equipped cavity systems at 1.8-2.2 K

Cavity tests at 1300 MHz

Cavity tests at 3900 MHz

Coupler tests at 1300 & 3900 MHz

BUW Field emission scanning of samples

CERN (central infrastructure)

Vertical tests of different sizes of SRF cavities between 4.5 and 2.0 K

Assembly and horizontal tests of fully equipped cryo-modules at 352/ 400/ 704 and 1300 MHz between 4.5 K and 2.0 K

Annealing and heat treatment in different UHV furnaces

Coating with niobium of different sizes of RF cavities made of copper

RF characterization of samples (surface resistance vs. RF magnetic field)

CI Sample tests (XPS/ SEM, RF tests)


Focus of equipment available in SRF test collaboration (2)


Laboratory Equipment

DESY XFEL infrastructure and TESLA TEST FACILITY

I NFN Roma Coating techniques of niobium on copper alternative to sputtering

SUPRATECH 1300 MHz power coupler tests

Vertical tests of SRF cavities of different size

Horizontal cryostat for high power RF tests at 2.0 K (CryHoLab)

Electro-polishing of niobium

TUD High temperature annealing of samples and small size cavities

UEN Microwave imaging laser scanning of samples


Proposed investment in central and complementary infrastructures


Technical work packages at central infrastructure Work package 1 (CERN-AB-RF):

managerial and technical coordination matters.

Work package 2 (CERN-AB-RF): RF testing activities in SM18, both at room temperature and low temperature extension of bunkers, acquisition of low and high power equipment at various frequencies, re-cabling of cryostats regarding the RF tests, including temperature mapping; RF characterization of samples and cavities assembly and cleaning operations of ancillary equipment (SM18 and B. 252).

Work package 3 (CERN-AT-ACR): cryogenic refurbishment, re-cabling of cryostats regarding the cryogenic operation, extension of the infrastructure to continuous operation at 2 K (SM18).

Work package 4 (CERN-TS-MME): surface polishing and cleaning activities (B. 118); coating activities (B. 252); characterization of samples by DC methods.


Proposed investment in central and complementary infrastructures (2)


Technical work packages at complementary infrastructures

Work package 5 (BESSY):

RF testing at room and low temperatures, down to 1.8 K, and low and high RF power of a the fundamental and 3rd harmonic system for the linac composed of TESLA like cavities at 1.3 GHz (HOBICAT).

Work package 6 (CI):

design, construction and commissioning of a 1.3 GHz host cavity to qualify samples made from niobium and other superconducting materials suitable for SCRF application.

Work packages 7 - 9 (three partners of Supratech):

preparation and upgrade of a diversified and large turn-over test infrastructure for, among others, SPL type cavities at 700 MHz;

coupler test and window coating station for various frequencies;

Upgrade of electropolishing and chemical polishing stations;

Proviion of1400 ºC UHV furnace (optional additional equipment).

Work package 10 (TUD):

UHV furnace (hot zone 2.1 m high with 0.17 m diameter; up to 1900 °C with p < 10 -7 mbar) ;

Vertical test cryostat (useful cold volume of 2.2 m depth and 0.35 m diameter, T > 1.8 K);

Equipment for cleaning and assembling the cavities as well as for their rf - controls is provided and maintained.




Criteria:

The classification into core and additional activities is in line with the CERN Council strategy document (Lisbon 2006);

Duplication was avoided (vacuum furnaces, electropolishing equipment etc.);

Equipment needed to increase test throughput was not retained (4th vertical cryostat at CERN, etc.);

General purpose and equipment not directly linked with SRF tests and R&D was not retained (civil engineering work, network analyzer, RGA, 3 GHz photoinjector etc.).




[kŪ] Core

activities P+I

Manpower costs for

investment P

In vestment I

BESSY 0 0 0 CERN 4648 969 3679

CI 0 0 0 Supratech 2381 514 1867

TUD 0 0 0 SUM 7029 1483 5546

[k€] Additional activities

P+I

Manpower costs for

investment P

In vestment I

BESSY 588 135 453 CERN 1529 205 1324

CI 78 16 62 Supratech 1166 116 1050

TUD 671 595 76 SUM 4031 1066 2965

Direct costs, but no travel and consumables included

Numbers are tentative


Items proposed for testing in central infrastructure


Responsible laboratory

Project Production / test item and

purpose Production / test requirement

BESSY FEL STARS Vertical acceptance tests of 1.3 GHz

TESLA cavities 1.3 GHz at low RF power and 2 K

BESSY FEL STARS 900 deg heat treatment of TESLA

cavities Furnace for 9-cell TESLA cavities

CERN SPL Validation of cavity performance

(backup to Supratech -DAPNIA-Saclay test station)

4.2 and 2 K operation

CERN SPL Cryostat and cryo-system 4.2 and 2 K operation

CERN SPL Niobium cavities inside cryo-module

without power couplers 2 K at low RF power (704 MHz]

CERN SPL Fully equipped cryo -module 2 K at high RF power (klystron 704

MHz)

CERN SPL Acceptance test of fully equipped

cryo-module after final corrections 2 K at high RF power (klystron 704

MHz) CERN HIE-ISOLDE Quarter wave Nb/Cu cavities 101 MHz at low RF power

CI factory Nb sputter deposition of 200 MHz

cavities Magnetron sputter deposition

equipment

DESY I LC Validation of fully equipp ed cryo-

modules 1.3 GHz at high RF power and 2 K

INFN Roma UHV arc systems

RF performance of samples and cavities

1.3 GHz at low RF power and 1.8 K quadrupole resonator / TE 011 type

cavity

Supratech SOLEIL,

SPIRAL-2, ADS

Validation of cavity performance (backup to Supratech -DAPNIA-Saclay

test station)

Low RF power at various frequencies (88, 176, 352, 700

MHz) and 4.2 K

UEN Laser

scanning microscope

Validation of operation inside cavity Cryostat insert and TE011 type

cavity


11 Sep 2007 ESGARD-OMIA-meeting-CERN 14

CERN SM18Preparation area next to clean room – bunkers in the

background

Conclusion and Outlook

The proposal described the purpose, organisation, and necessary investment needed for a the refurbishment/upgrade of a network of installations in Europe for R&D and test of superconducting radio-frequency cavities and cryo-modules:

Non exhaustive list of collaboration partners open to others Shared responsibility of host laboratory for the recurrent operation

and the users for the specific project equipment and test Equipment for purchase or upgrade was identified (core /

additional activities) Preliminary cost estimate was provided but needs to be revisited Test objects for central infrastructure were identified

Remaining items for FP7: Collecting the financial commitment of some partner laboratories


srf test infrastructure in europe w. weingarten with o. brunner, s. calatroni, b. vullierme (cern)...

Documents

test of srf cavities

srf infrastructure

srf test infrastructure

development of srf cavities

field of srf

cern projects

prototyping cavities

rf exposure