Magnets Technologies for NOνA Transfer Line (& RR30 section) July 21-23, 2009

Magnet Count Summary TypeComment Total Required From Tunnel Available From Storage Construct New Modify Existing RQNxRecycler style 20 in. permanent magnet quad All Somewhat PDSNew SmCo5 style double dipole PDDPDD 8 Gev style double dipole, existing style PDDWPDD dipole design, reduced field MGSRecycler dispersion suppressor mirror magnet ADCWModified B1 style to open aperture MLAWMI style injection Lambertson, new, modified ILAMI style Lambertson MQTOld MR style quad trim HDCOld MR style horizontal corrector used in Recycler VDCOld MR style vertical corrector used in Recycler MCHLEP Horizontal corrector MCVLEP vertical corrector 22000

Where are they coming from? Existing magnets available from tunnel or storage –MGS, RQNx (re-measure, re-trim) New construction of existing designs –PDD New constructions of modified designs –MLAW, PDDW Modification of existing magnets –ADCW New construction of new design –PDS

Permanent Magnet Quadrupoles (RQN) Modification of existing RQM’s Need 48; including spares 49 are available Issues to be addressed –It will be necessary to re-trim and re-measure all –R&D has occurred and will continue relating to trimming measuring, and brick magnetization –The R&D effort on spares is being used to get us back in the “permanent magnet business”

Permanent Magnet Quadrupoles (RQN)

PDS Why a new dipole? –Need to fit a dipole in an area with small beam separation –Build a magnet with SmCo5 (stronger) instead of Strontium Ferrite Issues –New design –Industry will build a small prototype. From this we will establish the design parameters of the final magnet Injection Line 847 To Recycler 848 MI PDS Vertical switching magnet 8 Gev line V2 (PDD)

PDS Many different designs considered Separation of only~6.25” between MI-8 and RRInj beam centers Must have 2’’x4’’ aperture for beam pipe. Need 2.312kG vs kG of PDD Integrated strength, T-m0.6 Center field, T0.24 SmCo5 residual flux density Br, T0.86 SmCo5 coercive force Hc, kA/m662 Air gap, mm52 Magnet length, m2.5 Magnet width, mm270 Magnet height, mm160 Volume of SmCo5, cu. inch600 Cost of PM material, $ (at 31$/inch3)18,600

PDS

Stretched wire, and rotating coil measurements of strength performed. Temperature dependence measurements completed Analysis underway Internal Design Review expected in August 09

PDD Injection line requires 5 new magnets Existing design, tooling, procedures and measurement –Not used for 10 years –Needs refurbishment

PDD

PDDW Modification to PDD dipoles ~10% of the ferrite bricks (and the corresponding compensator) will be replaced with aluminum blocks (and strips). Will require more tuning than the PDD dipoles. Sufficient strontium ferrite bricks and compensator material exists.

MGS One in the tunnel and one in storage Will need to be measured

Vertical Bend Dipoles (ADCW) –Injection line – 1 each –Extraction line – 2 each –Rebuild old 8GeV line dipole with ~3/4’’ spacer in back leg to open gap. More than enough magnets have been found. The beamline design has been optimized such that heat load and field leakage issues are not a concern. For a ~33mr bend will run at <700 Amps ADCW

Laser cutting of spacer lamination would have been cheaper, however specification were not achieved. Stamping is necessary Vendor stamping of laminations underway (samples expected soon) Coils on old ADC’s were found to be unsecured. This will be address in the modification

ADCW Modeling For ~33mr the magnet needs to run ~670 Amps ADC has run in this range. An unmodified ADC has been measured

ADCW Modeling We have identified a power supply sufficient for 15hz magnet testing purposes, and plan to measure the first magnet at a 15hz pulse rate. Measurement of the 1 st modified ADCW is expected ~ October 2009

MLAW Rotated/Modified Lambertson 5-6 mm gap increase will increase the current requirements by14% over the smaller aperture The required bend, however, will be ~14mr (40% of current bend) The new Lambertson will need to run ~430Amps (currently runs at ~950Amps) Circulating Beam Injected Beam (upstream/Lambertson end) Injected beam (downstream/RR beampipe end) With a modified MLA Solid lines: 6  Dashed lines: 10 

MLAW Two (2) MLAW Lambertson magnets, one for the Recycler injection line and one for the RRMI30 transfer line will be fabricated These will be a modified version of the magnet currently used for injection from MI ‑ 8 to the Main Injector. Spacers to increase

MLA Measurements In the range we will be running the Lambertson, (~430A) the field strength is linear MLA002 has had stretched wire measurements of strength and field shape Summary of MLAW vs MLA model in NOvA docDB doc 3155 ( docdb.fnal.gov:440/cgi- bin/ShowDocument?docid=3155 ) docdb.fnal.gov:440/cgi- bin/ShowDocument?docid=3155

Conclusions No new “groundbreaking” work will occur. Most work consists of modifications of existing magnets or new fabrication of magnets which are either existing designs or modifications to existing designs (MLAW, PDDM, and PDDW). Working with spare permanent magnets will continue to refresh “forgotten” permanent magnet knowledge Fabrication of magnets with SmCo5 can be tricky, but industry has experience with them. Currently we are testing a prototype in order to finalize a production design