Minutes of the IR FEL Beam Transport Meeting, May 2, 1996

NOTE: Meetings are held every THURSDAY, 1:00 PM IN (BLDG. 58), TEST LAB CONFERENCE ROOM, unless otherwise notified.

ATTENDEES: S. Benson, G. Biallas, K. Jordan, C. Murray, G. Krafft

Decisions/Comments:

None.

Items to Pass on to the Diagnostics/Commissioning Meeting:

None

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.

D. Douglas/C. Bohn - Add the bunch lengths to zones on the layout drawing in the main beam line and the Injector respectively. 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.

D. Douglas - Continue to refine lattice. Work continuing.

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.

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

G. Biallas - Publish with the layout drawing, a summary of the magnetic elements and if and how they are powered in strings. Now available in the Biallas's shared folder

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.

J. Parkinson/S. Benson - Investigate the "easy way" the ALS aluminum vacuum chambers were made. In process

G. Biallas - Get the BT contracts signed. J. Parkinson has signed for Installation Signature and sent them to alignment.

G. Biallas - Inquire if F. Ellingsworth can be lent out at this time. No progress.

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

G. Biallas - Inquire of D. Douglas if the vertical corrector after the second arc can go slightly down stream and can the dump dipole move somewhat up stream to take its place. No progress.

New Action Items:

G. Krafft - Determine with D. Douglas what dipoles will be powered in what strings.

C. Bohn - Determine with D. Douglas which magnetic elements can be started in engineering design.

E. Feldl - Make the prototype weak QB.

G. Biallas - Define the trim quad for start of engineering design

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.

New Action Items from the Diagnostics/Commissioning Meeting:

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.

Completed Action Items:

G. Krafft - Resolve if we can power the return leg quadrupoles in a series string. (Must allow for E measurement) The resolution was to power the quads independently and use software to gang them up if necessary.