ps booster 2 gev upgrade - magnets

PS Booster 2 GeV upgrade-

Magnets

Subjects• Transfer line magnets

• Auxiliary ring magnets (multi-pole, correctors etc...)• Main ring Quadrupole magnets (32 QF & 16 QD)

• Main ring Dipole magnets (30 Normal, 2 Special & 1 Reference)• New main ring magnets

Antony Newborough TE/MSC/MNC December 1st 2010PS Booster 2 GeV upgrade

Transfer line and Auxiliary ring magnetsTransfer line magnets• BT: 24 Magnets• BTM: 6 Magnets • BTP: 15 Magnets• Cost estimate: 1.4 MCHF (18/45 magnets)• Several magnets need to be measured & have alternative powering scenarios explored. Auxiliary ring magnets• Multi-poles (QNO,ONO, OSK etc...): 112Magnets• Correctors (DHZ, DVT): 72 Magnets• Used at low energy

BT.BHZ.10 - TBH

• Critical magnet for LHC operation• No spare unit available• Not adequate for 2 GeV operation• Consolidation project is on hold until PS injection layout is defined.


6 * BTP Quadrupoles

• Constructed 1971• Limit for 2 GeV operation• Solid Yoke (non PPM)• Suitable design available

Main Ring Quadrupole Magnets

Findings:• Increase of field strength seems feasible• Field quality is not affected• This preliminary study will be cross checked with measurements• Power increase will require modifications to the cooling circuit• Magnets are far from saturation


Main Ring Quadrupole Magnets – Power and cooling

• Removal of the Eletta flow switches will give an increase of flow, allowing for up to a 10 % increase in RMS current without an increase of pressure or temperature. To compensate for the removal of the flow switches additional thermal switches would be installed. Tests are ongoing. • The connections types are to be reviewed to increase the reliability of the magnets.

BR.QF PRESENT 2 GeVFIELD GRADIENT (T/m) 5.6 7.665PEAK CURRENT (A) 4032.5 5255RMS CURRENT (A)* 2260 2495POWER COMSUMPTION (kW) 12.1 14.7Q (@ DT= 29 K) (l/min) 6.2 7.6DT (@ Q = 6.2 l/min) (K) 29 35

BR.QD PRESENT 2 GeVFIELD GRADIENT (T/m) 5.6 7.665PEAK CURRENT (A) 4032.5 5255RMS CURRENT (A)* 2260 2495POWER COMSUMPTION (kW) 16.9 20.5Q (@ DT= 24 K) (l/min) 10.6 12.8DT (@ Q = 10.6 l/min) (K) 24 29

* Requires faster cycling for 2 GeV operation


Main Ring Dipole Magnets

Initial Findings:• Increase of field strength seems feasible• Field quality does not seem to be affected with 2D analysis.• Magnetic measurements confirm the initial study and are ongoing.• Power increase will require modifications to the cooling circuit.• Due to higher saturation of the outer rings a higher current differential than present is required, which may be compensated for. • Higher forces require modifications to the coil shimming method.


Main Ring Dipole Magnets - Power and cooling

• Removal of the Eletta flow switches will give an increase of flow, allowing for up to a 10 % increase in RMS current. To compensate for the removal of the flow switches additional thermal switches would be installed. Tests are ongoing. • The connections types are to be reviewed to increase the reliability of the magnets.


BR.BHZ Normal configuration Present UpgradeFIELD STRENGTH (T) 0.86 1.12PEAK CURRENT (A)

Inner Rings 4032.5 5255Outer Rings 4065 5515

RMS CURRENT (A) *Inner Rings 2260 2495Outer Rings 2270 2555

POWER COMSUMPTION (kW)Inner Rings 50.1 61.0Outer Rings 50.5 64.0

Max DT (@Q = 26 l/min) (K) 29 36Max DT (@Q = 30 l/min) (K) 25 32

* Requires faster cycling for 2 GeV operation

Main Ring Dipole Magnets - Saturation and shimming• Concerns over the robustness of the assembly WRT the coil shimming and retaining plates.• Initial findings showed that the contact between coils and plates is a concern.• Modifications to increase the contact area and method of shimming have been trialed with a peak current of 9 kA.• Installation work could take place in the machine at the same time as the new laminated plates (assuming agreement from radio protection)• Tests are to be carried out to determine the reliability of the yoke side shimming. However,if modifications are required all magnets would need to be removed from the machine.

Present Upgrade Proposed Test (low freq. 5000 cycles) AchievedEnergy (GeV) 1.4 2Field (T) 0.86 1.13 1.8 1.6Current (kA) 4 5.5 10 9Coil Force on retaining plate (kN) 32 54 138 101Contact Pressure 'original' (MPA)* 1.98 3.36 8.63 6.3Contact Pressure 'Mod' (MPA)* 0.66 1.12 2.88 2.1* Assuming 100% contact


Main Ring Dipole Magnets - Saturation and shimmingThe majority of the difference in field between the inner and outer rings (approx. 1% @ 1.4 GeV, 4% @ 2 GeV) may be compensated with laminated plates and implemented in parallel to the shimming modifications.

Reducing the saturation: • Improves the repeatability of the magnetic cycle.• Decreases the RMS current in the outer rings decreasing any additional temperature rise.• Advantages for power supply configuration.


2 GeV Operation Inner Outer Difference Difference Current (A) 5275 5275Field Strength (T) Solid Plate 1.124 1.083 0.042 3.85 %Field Strength (T) Laminated plate 1.127 1.119 0.008 0.71 %Field Gain (T) 0.003 0.036

Main Ring Dipole Magnets - Saturation and shimmingSpecial injection and extraction magnets


• Special Coil configuration to allow the beam to enter and exit the machine.• laminated plates more difficult to implement, but not impossible.• Initial modeling seems to be promising.

Main Ring Dipole Magnets – Reference Magnet


• Proto-type Bending Magnet• Ground fault during 2009 High Voltage test• All coils in series• Existing coils would need to

be separated or replaced to run with two M.P.S. and two B-train measurements.

• No current means of removing the magnet from Booster convertor room.

Main Ring Magnets – New Magnets


• Why consider new magnets?• Reliability issues with the old magnets?• Cost / Power savings

• What can be done?• Increase of conductor section and # turns• Increase of iron section to remove saturation

effects of outer rings

• Consideration must be given to:• Cost of new magnets• Weight of new magnets (~ 18 tonnes)• Space constraints• Radio active waste (old magnets, ~ 80 m^3)• Installation time• Vacuum and accessories• Power convertors

OLD NEW


Main Ring Magnets – New MagnetsBR.BHZ Normal configuration* Present @ 1.4 GeV Present @ 2 GeV New @ 2 GeV# turns per apperture 12 12 18Conductor Section (mm^2) 400 400 600Resistance per magnet (Ohms) 9.8 9.8 9.8Peak Current (A) 4032 5255 3466RMS Current - slow cycle (A) 2260 3121 2005RMS Current - Fast cycle (A) 1890 2486 1609Total power (33 Magnets) - slow cycle (MW) 1.6 3.1 1.3Total power (33 Magnets) - fast cycle (MW) 1.1 1.9 0.8

* Assumes un-saturated inner rings

Parameters Quadrupole Cell (QF, QD, QF) Present @ 1.4 GeV Present @ 2 GeV New @ 2 GeV# turns per pole 2 2 3Conductor Section (mm^2) 440 440 660Resistance per triplet (mOhms) 3.3 3.3 3.3Peak Current (A) 4032 5255 3466RMS Current - slow cycle (A) 2260 3121 2005RMS Current - Fast cycle (A) 1890 2486 1609Total power (48 Magnets) - slow cycle (MW) 0.27 0.52 0.21Total power (48 Magnets) - fast cycle (MW) 0.19 0.33 0.14

• Magnet Circuit Resistance – Unchanged ~ 500 mΩ (Main Dipole magnets ~ 344 mΩ, Main Quadrupole magnets ~ 130 mΩ)

• Magnet Circuit Inductance – To more than double ~ 146 mH (Main Dipole magnets ~ 132 mH, Main Quadrupole magnets ~ 14 mH)


TE-MSC-MNC - Conclusions

• Transfer Line Magnets• A number of magnets must be changed for 2 GeV operations• Different powering configurations can be explored to save some magnets,

D.C. Cycling to pulsed mode.• All BTP Quadrupole magnets should be changed to laminated versions.

• Auxiliary ring magnets are not concerned by the 2 GeV upgrade.

• The Main ring magnets • Can be operated at 2 GeV with:

• Modification to the coil shimming and the new laminated plates are desirable, if not 100% necessary.

• Minor in-situ modifications when the increase in RMS current is <= 10% (RP approval still required).

• Major modifications to the cooling circuit when the RMS current is increase by more than 10% (Magnets would need to be removed from the machine).

• New magnets may be considered to explore reliability, power and cost savings.


Thank you for listening-

Discussion

ps booster 2 gev upgrade - magnets

Documents

magnets btp

magnets btm

qd main ring dipole

cooling circuit magnets

increase of flow

ps booster

magnets correctors dhz

magnets cost estimate