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

ATTENDEES April 11: S. Benson, G. Biallas, C. Bohn, K. Jordan, D. Kashy, D. Kehne, G. Krafft, C. Murray, G. Neil, J. Preble, M. Wiseman

ATTENDEES April 25: S. Benson, G. Biallas, K. Jordan, D. Kashy, C. Murray, J. Parkinson

Decisions/Comments:

The meeting of April 11 will be the end of the general technical meetings. From now on, the meeting will concentrate on the Beam Transport System.

One way to balance the force on the bellows on the 180° Dipoles is to use an opposite bellows off 16 inches diameter as an anchor.

A first cut at the position of bellows and diaphragm flanges and girders was done for most of the machine and passed on to C. Murray.

Items to Pass on to the Diagnostics/Commissioning Meeting:

Design the shielded viewers as bolt-in upgrades of regular viewers

Decide if we should overpower the dipole after the cryomodule and handle both energy beams for effective tune up. How about C. Sinclair's microdumps straight ahead?

Asses the need for Faraday cups.

S. Benson - provide guidance to K. Jordan on the requirements of the special OTR viewers in the optical chicane.

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.

B. Yunn - Refine impedance analyses. A Tech note is being written.

D. Douglas - Continue to refine lattice, declare what elements can be frozen for engineering and start tracking runs on the machine to find the high order effects. The Lattice review generated several new items that have to be checked out.

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. Preliminary coil calculations complete. Requests for estimates on the 180° Dipoles are going to two vendors.

C. Murray - Continue Layout - Start the cross sections. Continued progress

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

J. Parkinson - Keep track of and make sure B. Yunn has the latest layout on all the inside configurations of the beam line. Started.

G. Krafft - Resolve if we can power the return leg quadrupoles in a series string. (Must allow for E measurement) In process.

G. Biallas - Publish with the layout drawing, a summary of the magnetic elements and if and how they are powered in strings. In process.

New Action Items:

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. Moves the dump out of the way of the cryomodule.

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

G. Biallas - Get the BT contracts signed for engineering and design by M. Wiseman and off to J. Parkinson for Installation Signature.

G. Biallas - Inquire if F. Ellingsworth can be lent out at this time

T. Siggins/K. Jordan - Review proposed Shielded Viewers for vacuum construction properties.

K. Jordan - Establish requirements documents for each of the diagnostic pieces of hardware. Transferred to Diagnostics Meeting.

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.

C. Murray - Add the bellows, diaphragm flanges, valves and new boundaries for girders and optical benches to the Layout.

Completed Action Items:

C. Bohn - Find out if cryomodule can be assembled without valves on the individual cavity pairs by using enhanced clean room techniques. Not worth the risk. Complete.

C. Murray/G. Biallas - Get D. Douglas to define the requirements for wider chambers in the recirculation bending dipoles. The second dipole in the reverse bend and all similar dipoles need a 8 inch vacuum tube tapering to six inches at the adjacent dipoles. Complete.

D. Douglas - Define instrumentation for the injection line if there is any. An OTR is necessary - see layout. Complete.

C. Murray - set the Synchrotron radiation ports tangential to a fraction of the trajectory that is in the fully developed field of the dipoles, not in the field roll off region. Add a bruster window to these positions. All ports set at 1/3 of the magnetic field length. Complete.