Brett Parker Brookhaven National Laboratory Superconducting Magnet Division 20 October 2010 ILC QD0 R&D Update IWLC2010 International Workshop on Linear.

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Presentation transcript:

Brett Parker Brookhaven National Laboratory Superconducting Magnet Division 20 October 2010 ILC QD0 R&D Update IWLC2010 International Workshop on Linear Colliders 2010

ILC QD0 R&D Update - Outline R&D Timeline Present Status Next Steps IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 2

ILC QD0 R&D Timeline – Step 0 IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 3 “NLC days” 2.2 m QD0 coil was wound using single strand wire. Note central rotating support to counter support tube deflection. In this scheme, dipole correction coils must either have very large mid-plane gaps or be wound as two separate coils. BNL Coil Winding Machine 2.2 m QD0 Coil

ILC QD0 R&D Timeline – Step 1 IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 4 After winding CERN -Magnet … we redesigned QD0 using cable. Octupole Winding The ILC QD0 Winding (uses twice smaller tube) ILC QD0 Coil Pattern Concept (multi-layer, 7-strand cable winding) Had to meet challenge to wind octupole coils, with very tight bends, for the anti-hydrogen trap experiment at CERN. After we learned to wind these tight cable bends, we created a compact coil with active shield (permitting 14. mr X-ing angle).

ILC QD0 R&D Timeline – Step 2 IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 5 Wound short quad and sextupole prototypes with very good field quality and quench performance. Looked to implement a moving coil support scheme with pairs of rollers. After “Black Friday” priority to ATF2. Coil went to short sample while in 7. T background solenoidal field. Support Rollers

ILC QD0 R&D Timeline – Step 3 IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 6 By the end of US–FY09, wound two QD0 coil sets… but even with improvements found tube position is not well controlled. Decided to go back to fixed tube supports (implies splitting quad coil into two halves). Use laser alignment from another project. Wound ATF2 quad and sextupole coils with very good field quality (via compensation). Stationary Coil- Winding Supports Laser Support- Alignment System

QD0 split coil variant may be useful for low-energy running as a Universal Final Focus. QD0 Split Coil Winding Implementation IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 7 Non-Lead-End QD0 Half Coil Lead-End QD0 Half Coil Sextupole Correction Package Extraction Line Quadrupole QD0 Split Coil Winding View Inside QD0 Cryostat to Show Coil Positions and Support Infrastructure IP End Lead End

Integral Field Quality in ILC QD0 Prototype: Harmonics are in "Units" of 10 –4 of main field at 5.0 mm radius. IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 8 NormalSkew

9 27 March 2010, GDE:BDS Session, LCWS10, Beijing “ILC SC FD & ATF2 SC Magnet Upgrade – Update,” Brett Parker, BNL-SMD Summary of Integral Field Quality in ATF2 Magnet Because field harmonics change rapidly with reference radius, we recalculated the measurements for R ref = 10 mm (for easy comparison to the present ATF2 magnets). The poorest quad harmonics (b3,a3), are now only 49. parts per million. The areas highlighted in blue are all smaller than 200 parts per billion.

QD0 R&D Production Discussion Based on experience winding the first two (of three) coil sets, we might have expected to see the QD0 harmonics to be ≤ 1. unit at R ref = 5. mm. Looking back we uncovered a file input error that troubled the non-lead-end coil more than the lead- end one generating spurious low order harmonics. Rather than losing time removing this last coil set to lay it down correctly, we have decided to push on with production in order not to delay vertical and horizontal cold testing. We still need to wind the main sextupole coil along with the octupole correction coil. IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 10

QD0 R&D Tests and 2012 Time Scale Parallel to finishing QD0 R&D coil winding we are producing the Magnet and Service Cryostats needed for horizontal testing. Look to have operational experience on 2012 (TDR) time scale. Recently new ideas were put forth on measuring the field centers & vibrations. Also address issues for new Universal Final Focus. IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 11 Service Cryostat Under Construction at BNL R&D Goal: Make and test Service Cryostat with 1.9K cryogenic transfer line for ILC-like running conditions.

IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 12 (A. Jain)

IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 13 (A. Jain)

Universal Final Focus (Cartoon) Issues IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 14 Here I took the CAD layout from slide #7 and did cut/paste to swap sextupole and one quadrupole coil. Expect that a proper redesign is a bit more complicated. QD0A QD0B Force Neutral Anti-Solenoid and QD0A Active Shield only need to extend over this region? Redesign support & alignment scheme. Sextupole and Octupole coils are now closer to the extracted beam; so must recheck level of external B-field. Does QD0B still need an active shield? [Hopefully it does not.] Maybe QD0B and QD0A can be powered independently with only QD0A and its active shield run in series? Do QD0A and QD0B have to have the same coil structure and magnetic length?

ILC QD0 R&D Timeline – Step n I believe that we know how to make high-quality QD0 coils; what is of interest to me now (and relevant to ILC TDR) is to learn how well we can align the quad/octupole/sextupole coils on their common support tube. Naively the present “flawed” QD0 coils match the desired “NLC field quality” and there seems to be no RDR field harmonic specification; we need to come up with a defensible field quality goal, especially in light of the newest Universal Final Focus and traveling focus optics concepts. IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 15

ILC QD0 R&D Timeline – Step n+1 Given a common desire to have R&D information in hand relevant to finalizing the TDR and new ILC concepts for cost savings and low energy running, we should reevaluate ways to maximize R&D return given limited remaining time and resources (i.e. plan for TDR endgame). Hopefully we can set homework goals to be reported on at the SLAC BAW in January In summary we have learned important lessons re. producing long, thin QD0 coil windings and now have a chance to prioritize the R&D feedback we want to see re. proposed ILC baseline changes. IWLC2010: International Workshop on Linear Colliders, 20-Oct-2010 “ILC QD0 R&D Update,” Brett Parker, BNL-SMD 16