NOTE: Meetings will be held in Room 84, Trailer City on Thursday at 1:00 P.M.

Agenda for the meeting of June 6, 1996:

Injector Dipole Prototype Design

Measuring the sparse lamination quad

ATTENDEES: S. Benson, G. Biallas, D. Douglas, J. Parkinson, L. Harwood, S. Benson, A. Guerra, M. Wiseman, K. Jordan, C. Murray

Decisions/Comments:

The probability of achieving a greater than 34 MV cryomodule in the next year is relatively low. Therefore the maximum design energy of the magnets should be closer to the 42 MeV of the DIMAD. Similarly, the final energy of the projected upgrade of the dipoles should not be 100 but rather closer to 75 MeV. If great strides are made, the additional turns can be added to the circuit in layers of new coil. The magnets should be measured in all configurations.

We will make the population of any one style of magnet track core field to one part in 10,000 by the use of shims in the back legs, well within the D. Douglas spec. of 1 part in 1000. The NP Machine had a whole population that fell within 1 part in 1000 for all magnets with no shimming.

We will adjust the core field of the 180 Degree Bends to the Reverse Bends using a combination of a smaller gap, a fixed amount of shunted current and shimming on the back legs to the D. Douglas spec. of 5 parts in 1000. All reverse bends at one end are to be on one shunt.

We will adjust the integral Bdl of the Reverse Bends to the correct value when at matched core field to the 180 Degree Bends by adjusting the position of the wedge along the bisector y axis to the D. Douglas spec. of 5 parts in 1000. The K value of 0.45 has to be verified using the BD dipoles as a model.

We will adjust the core field of the Optical Chicane bends to the Reverse Bends using a combination of a gap that is the shunting less than 6.29% larger, a fixed amount of shunted current and shimming on the back legs to the D. Douglas spec. of 5 parts in 1000.

We will adjust the integral Bdl of the Optical Chicane Bends to the correct value when at matched core field to the 180 Degree Bends by shimming in the back legs to the D. Douglas spec. of 5 parts in 1000. (Should this be shims on or removal of iron on the pole face ends?)

We will make the magnets uniform over their width to one part in 10,000 using mechanical tolerances, conforming to the D. Douglas spec.

D. Douglas requested that the entire string of all dipoles have jitter in its fields of less than 1 part in 100,000.

D. Douglas requested that any individual dipole have jitter in its field of less than 1 part in 1,000,000. That is, ripple due to the shunts.

D. Douglas refined his request that the 180° Bends, the Reverse Bends and the Optical Chicane Dipoles be powered in one string with ganged shunts that give +-1/2%, 1% and 1.5% adjustment to the types respectively.

Jim Parkinson requested a 0.05 clearance to the beam tubes to accommodate construction tolerances. D. Douglas sees no problem with the vertical extent of the beam. We have to check the vacuum tube dimension for the 8 inch, aluminum case.

The use of back leg windings for adjusting field was discouraged because of the adverse effects of local saturation on the ability of the magnet to track.

Items to Pass on to the Diagnostics/Commissioning Meeting:

Action Items:

G. Biallas/J. Parkinson - Do the appropriate calculations and get Sign-off on relaxed vacuum requirements near cryomodule by R. Sundelin & P. Kneisel. We need the hard interlock values for closing valves. No progress.

J. Parkinson/C. Murray/B. Yunn - Maintain latest layout/ define the vacuum tube at all discontinuities, refine impedance analyses and write the Tech. Note. Definition of discontinuities in process. C. Murray will go back to this task tomorrow.

C. Bohn - Establish a clean statement of the energy range of the machine. Status: Need help from Biallas/Harwood to plot cost vs. maximum energy for the magnetic optics. Division Leadership Group wants to see this data. One price estimate received. No Progress.

D. Douglas - Check if the existing QJs can be used in the new injection line. No news

G. Biallas - Ask David Douglas about reversing the dipole at the Injector dump to deflect the beam twice the angle and eliminate the additional bend dipole. Proposal has merit, but requires wider short injector dipole. Awaits Leigh's design of the dipole.

G. Biallas - Get the BT contracts signed. G. Biallas has to check task list.

T. Siggins/K. Jordan - Review proposed Shielded Viewers for vacuum construction properties. No progress.

E. Feldl - Make the prototype weak QB. Stacking to begin Friday 5/17/96.

G. Biallas - Define the trim quad for start of engineering design. No progress.

G. Biallas - Start definition of a girder for the wiggler, diagnostics and quad telescopes that maintains position of the elements within 50 µm (0.002 in.) during change-out of the wiggler. No progress.

L. Harwood - Determine if placing additional dipole(s) around the first dipole of the dump chicane after the cryomodule is the best method of bending pulsed 42 MeV beam into the dump during cryomodule phasing.

D. Douglas - Check the width of the beam in the 45° either side of the 90° point in the 180° Dipoles.

New Action Items:

None

New Action Items from the Diagnostics/Commissioning Meeting:

None

Completed Action Items:

None