Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 1 Magnets for Linac4 Th. Zickler CERN 6 th Linac4 Technical Design Committee Meeting 10 th October 2006 Many thanks to A. Lombardi, G. Bellodi, K. Hanke, W. Weterings, B. Goddard, M. Chanel, R. Scrivens, J.P. Royer, S. De Man and others for their input and contribution.

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 2 Outlook  New magnets for Linac4  New magnets for the Linac4 to PS-Booster transfer line  Existing magnets in the Linac2 transfer line to be reused in the Linac4 transfer line  Summary and conclusions

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 3 New Linac 4 Magnets - Overview  In total ~ 100 new electro-magnets needed for the Linac4 and transfer line: –24 quadrupoles for CCDTL –20 quadrupoles for SCL –~ 10 steerers for CCDTL & SCL –23 quadrupoles for TL –6 dipoles for TL –~ 12 steerers for TL –Spare magnets of each type  Important issues for the design: –Pulsed or dc operation ? –Water or air cooled ? –Only for Linac4 or to be used also for later SPL ?

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 4 New Linac 4 Magnets – Restrictions & Requirements  Input from AB/ABP: –Max. overall dimensions (in particular for Linac4 restrictions in length) –Magnet aperture –Integrated field respectively integrated gradient –Required field quality (e.g. < 1% gradient homogeneity for quadrupoles) –Size of good field region (75% of aperture) –Air cooling preferred  Input from AB/PO: –Limitations given by the power supplies –Pulsed operation preferred –Max. dI/dt –Max magnet inductance –Max. excitation current

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 5 CCDTL & SCL Quadrupoles - Parameters  A common design for both types (CCDTL & SCL) to reduce costs.  Can also be used for SPL - but still requires optimization  Limitation in length and outer diameter (L < 120 mm, d < 220 mm).  Design based on existing Linac2 quads but improved field quality.  Air cooled  only pulsed operation possible! CCDT & SCL Quadrupoles (air) Number of magnets44+ 4 Magnet characteristics Gradient18.0T/m Aperture radius17.0mm Iron length95.0mm Effective length108.6mm  Gdl 1.95Tm/m Dimensions Total magnet length110mm Outer diameter145mm Total magnet weight11.0kg Electrical parameters Max. Current100A Duty cycle4.1% RMS current4.1A Magnet resistance at 20 C109.3mOhm Inductance1.9mH Max. Voltage398V Max. Dissipated power (pulsed)1.8W Note: magnet parameters are not yet frozen and can still change

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 6 CCDTL & SCL Quadrupoles – Magnetic Design 2D magnetic field computation in OPERA (only one quadrant has been modelled)

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 7 CCDTL & SCL Quadrupoles – Field Quality Disclaimer: only a preliminary magnetic design is presented in these slides. To optimize the gradient homogeneity and the integrated field quality, 3D-FE computations of the pole shape will be neccessary.

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 8 Linac4 – PSB TL Quadrupoles - Parameters  Iron length has been reduced from 600 mm to 250 mm to reduce costs and improve field quality (to be approveld by AB/ABP).  Air cooled  only pulsed operation possible! PSB TL Quadrupoles (air) Number of magnets23+ 3 Magnet characteristics Gradient8.0T/m Aperture radius35.0mm Iron length250.0mm Effective length278.0mm  Gdl 2.22Tm/m Dimensions Total magnet length276mm Outer diameter269mm Total magnet weight96.9kg Electrical parameters Max. Current200A Duty cycle4.8% RMS current9.7A Magnet resistance at 20 C93.0mOhm Inductance3.6mH Max. Voltage741V Max. Dissipated power (pulsed)8.7W Disclaimer: only a preliminary magnetic design is presented in these slides. To optimize the gradient homogeneity and the integrated field quality, 3D-FE computations of the pole shape will be neccessary.

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 9 Linac4 – PSB TL Quadrupoles – Magnetic Design 2D magnetic field computation in OPERA (only one quadrant has been modelled)

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 10 Linac4 – PSB TL Bending Magnets - Parameters  H-shape magnet type.  Number of families changed from 3 to 2 to reduce costs and number of spares.  A common magnetic yoke design for both types (type A and B) to minimize tooling costs.  Difference only in iron length (600 vs mm).  Water cooled.  Slow pulsed operation proposed (40 % duty cycle).  Operation in dc mode possible with enhanced cooling performance. 2D magnetic field computation in ANSYS (only one quadrant has been modelled)

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 11 Linac4 – PSB TL Bending Magnets - Parameters PSB TL Bending type A (water) Number of magnets3+ 1 Magnet characteristics Magnet field1.0T Gap height70.0mm Iron length600.0mm Effective length677.0mm  Bdl 0.677Tm Deflection angle357mrad Dimensions Total magnet weight805kg Total magnet length788mm Total magnet width530mm Electrical parameters Max. Current1000A Duty cycle39.2% RMS current391.6A Magnet resistance (hot)24.2mOhm Max. Dissipated power (pulsed)3.7kW Inductance8.2mH Cooling parameters Pressure drop5.0bar Temperature rise7.7K Total cooling flow6.8l/min PSB TL Bending type B (water) Number of magnets3+ 1 Magnet characteristics Magnet field1.0T Gap height70.0mm Iron length1000.0mm Effective length1077.0mm  Bdl 1.077Tm Deflection angle573mrad Dimensions Total magnet weight1329kg Total magnet length1188mm Total magnet width530mm Electrical parameters Max. Current1000A Duty cycle39.2% RMS current391.6A Magnet resistance (hot)35.7mOhm Max. Dissipated power (pulsed)5.5kW Inductance13.1mH Cooling parameters Pressure drop5.0bar Temperature rise14.2K Total cooling flow5.5l/min Note: magnet parameters are not yet frozen and can still change

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 12 Steering Magnets for Linac4 & TL Steering Magnet (air) Number of magnets22+ 2 Magnet characteristics Magnet field27.0mT Gap height70.0mm Gap width70.0mm Iron length80.0mm Effective length147.2mm  Bdl 4.0mTm Deflection angle2.1mrad Dimensions Total magnet weight4.2kg Total magnet length103mm Total magnet width116mm Total magnet height116mm Electrical parameters Current20A Duty cycle4.1% RMS current0.8A Magnet resistance (hot)401.3mOhm Max. Dissipated power (pulsed)0.3W Inductance2.1mH Max. Voltage93V  Combined horizontal and vertical corrector design.  A common design for all types (DTL, CCDTL, SCL & TL) to reduce costs.  Can also be used for SPL.  Limitation in length (L < 110 mm).  Air cooled  only pulsed operation possible! Note: magnet parameters are not yet frozen and can still change

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 13 Existing magnets in the Linac2 – Booster TL The existing magnets in the LTB and BI transfer line need to be checked if their performance is adaquate for Linac4 operation (see also presentation of W. Weterings at the 3rd Linac4 TDC meeting): –Field (gradient) strength adequate (160 MeV = factor 1.9 in  Bdl with respect to Linac2)? –Field (gradient) quality adequate? –Upgrades possible (pulsed operation, increased cooling performance)? –If not, replacements available? –If not, parameters for new magnet design to be defined.

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 14 Existing magnets in the Linac2 – Booster TL (Table)

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 15 Existing magnets in the LTB line  Probably all steering magnets in the LT(B) line can be reused without any modifications needed.  LT.QFW70, LTQDN75, LTB.QDN10, LTB.QFN20 (type SMIT air and LINAC VII) can be reused without any modification needed.  The four laminated, air cooled quadrupoles (LTB.QDW30, LTBQFW40, LTB.QFW50, LTBQDW60) type TRIUMF installed in 1997 (actually in dc operation) can be used in (slow) pulsed operation.  The field quality of LT.BHZ30 has to be checked when powered with twice the nominal current (260 A  520 A).

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 16 Existing magnets in the BI-line  Probably all steering magnets in the BI line can be reused without any modifications needed.  The four quadrupoles (BI.QNO10, BI.QNO20, BI.QNO30, BI.QNO40) type SMIT aircooled (massiv yoke) have to be replaced either by existing magnet of type SMIT watercooled (massive yoke  dc operation) or new magnets type TRIUMF (laminted, air cooled  pulsed operation).  BI.BVT (4 gaps) has to be replaced by a new magnet with increased strength (~ MeV).  BI.QNO50, BI.QNO60 (type SMIT water) can be reused without any modification needed.

Linac4 Tech. Design Committee 10 th October 2006 Thomas Zickler AT/MEL/MI/tz 17 Summary and conclusions  The design of the new magnets for Linac 4 and TL has been presented.  Approximately 100 new magnets of 5 different types are needed and have to be built in industry.  For the mechanical design work of these magnets a experienced draughtman is needed for 12 months.  The design work has to be started as soon as the project is approved (~ 100 kCHF to be allocated in the first year).  AT/MEL actually does not have the resources to procure and follow-up the production of these magnets (required manpower to be defined).  Most of the magnets in the existing TL can be reused or replaced by magnets available at CERN.  The refurbishment of recuperated magnets will be done by AT/MEL prior to installation.  One (or two) magnet types have to be replaced by new magnets to be built in industry.