ATTENDEES of Oct. 17: C. Bohn, L. Dillon-Townes, D. Douglas, E. Feldl, G. Neil, C. Murray, M. Wiseman

Schedule Comments, Decisions and other Comments:

Meetings will be held every Thursday from now on.

No need to align BPMs except via fixturing to do it with respect to quad. Then just align the quad.

L. Dillon-Townes passed around draft vacuum spec.

D. Douglas reports he needs about a week to finalize foot print after final K value is established.

Action Items:

G. Biallas - Get the BT contracts signed. Contracts needed to be changed to new DIMAD configuration. Due last month, not done.

A. Guerra - 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. A. Guerra looking at a home made bench. CERN adjuster information obtained through Will Oren and passed to A. Guerra. making a package for Northrop Grumman design.

G. Biallas/L. Harwood - Provide a good value for field enhancement factor for the style of magnets we are anticipating. Prototype saddle coils are being sent from Magnet Technologies International .

M. Wiseman - Thermal analysis of the 45 MeV Dump for 50 kW & beam scraper analysis for 45, 79 and 200 MeV. Additional progress made.

C. Bohn - Check D. Douglas' numbers on the new DIMAD. Best done by J. Van Ziejts. No progress.

E. Feldl - Get the procurement package for the Weak Quads to Procurement by the end of September. In process.

J. Karn - Make the prototype Trim Quad by Oct. 16. Bumped in the shop by CEBA and ITS magnets.

New Action Items :

C. Murray/L. Dillon-Townes - D. Douglas needs room to put a skew quad at the ends of the cryomodule. He will provide geometry to C. Murray.

C. Murray/L. Dillon-Townes - Add a current monitor to the end of the Cryomodule.

G. Krafft - Determine quantity of insertable dumps. Do they have to be isolated?

G. Krafft - Determine requirements for straight-ahead dump.(Monday meeting planned.)

L. Dillon-Townes - Resolve number and location of electrostatic precipitators.

J. Parkinson - Establish how we will clean vacuum chamber pipes

D. Douglas - With d. Kehne, resolve beam spot sizes at energy-recovery and straight ahead dumps.

Completed Action Items :

L. Dillon-Townes/C. Murray/B. Yunn - Maintain latest layout/ schedule the completion of the definition of the vacuum tube at all discontinuities by 8/15/96, refine impedance analyses and write the Tech. Note. Definition of discontinuities is at 95%. L. Dillon-Towns shall get definitions of the scrapers, the wide OTRs and the new proposed 180 degree Bend button BPMs within two weeks. Complete. Impedances are at a half to two thirds of budget.

C. Bohn - Determine the position of the beam scrapers by September 18. Complete. One is needed after the first return bend.

W. Merz/K. Jordan - Define the power supply for use with the Optical Chicane Dipoles. W. Merz suggests that the spare supply for the 9 doglegs and 2 extraction septa would be suitable for the 42 MeV case for the few months of operation while the 66 kW supply is a match for the upgrade case. Stocking the appropriate parts such as a transformer would make the use of that spare less risky. The trade off is buying a 25k$ supply. Complete. We will use this power supply if the spare parts are ordered.

G. Biallas - Get Vacuumschmelze material for prototype Reverse Bend. On order.

D. Douglas - Ask A. Hutton what QB Quads are available with the "New Optics" that are now being introduced. Defined. 10 are available with two additional available wit some difficulty.

C. Murray/L. Dillon-Townes - Look into placing a fast valve into the line immediately after the Cryomodule and add it to B. Yunn's List. Complete.

L. Dillon Townes - Submit the paperwork for a change order to add the spare fast valve to the Baseline of the IRFEL. Complete.

J. Karn - Extract the data on the CEBA sextupoles as a calibration on how good the IRFEL sextupoles have to be. Complete, requirements match the existing data on our simplistic design.

New Action Items for the Vacuum Meeting:

None

Summary of Vacuum Meeting Minutes 10/9/96:

Attendees: Wiseman, Biallas, Wines, Feldl, Parkinson, Dillon-Townes, Murray, Preble.

Vacuum Review scheduled for afternoon of October 31, 1996.

Thumbnail sketch of review was discussed: J. Parkinson and R. Sundelin have agreed to serve as reviewers. One more reviewer is being sought. Initial presenters are as follows: Vacuum System Design -- Dillon-Townes

Diagnostics -- Jordan

Impedance -- Yunn

Machine Layout.

Electrostatic Precipitators: The number and location will be revisited in the 10-10-96 Beam Transport meeting to finalize their status.

Beamline Flexibility for installation: An installation meeting revealed that diaphragm flanges and/or bellows will be needed to facilitate alignment and installation. Dillon-Townes, Murray, and Williams will take first look at the need. The element mounting philosophy will also be reviewed ( girders .vs. individual stands).

Bunch Length Measurement: Eric Feldl has a request to monitor the bunch length throughout the machine in a "roving" manner. His need is have this device supported off existing crosses. Definition of the requirement and the location of the measurements are being reviewed.

Fast Valve: Change order has been submitted and awaiting approval. It was suggested that the order be placed after the review in October.

Vacuum chamber clearance: It was decided that the clearance between the vacuum chambers and the magnet poles be .064" minimum to facilitate installation.

Button BPM in 180 degree bends (Arc Chambers): Eric Feldl informed us that the button BPM in the Arc chambers protrude approximately 1" into the 6" chamber. A drawing will be given to Yunn for impedance analysis. In addition the new viewer design creates a significant opening in the chamber that must also be analyzed for impedance impact.

Vacuum Part: 80% of the standard parts required to build the machine have been identified and will be ordered this week.(Flanges, valves, beam pipe, etc.). A second detailed review with installation and alignment representatives will be done to identify the other 20%.

Analysis Effort

Impedance Study: Present machine configuration is well within the budget. Yunn has completed the impedance analysis for the moment. He has defined the impedance effects for the injector, Linac to wiggler, and recirculation paths. He also includes the budget for each path. ( See attached report).

Vacuum System: Sector 1 (injector) analysis is in process. Second analysis will be done by Cornell analysis for collaboration.

Design Effort

Sector !(injector) Layout: Drawing is ready for distribution to groups for review.

Shielded Bellows: Standard design near completion.

Summary of Vacuum Meeting Minutes 10/23/96:

Attendees: Wiseman, Biallas, Feldl, Parkinson, Dillon-Townes, Preble, G. .Marble,

J. Heckman, S. Williams, C. Curtis, J. Dalberg.

The meeting was devoted to discussing Sector 1:[ Injector (0F) and Injector Dump (0G)] elements, requirements for installation, alignment requirements, vacuum pressure regions, beamline assembly, and bakeout regions and philosophy. The specifics of the meeting will be tabulated below, but can best be depicted on a revised layout which will be done.

Element Installation:

1) BPM alignment tolerance to quads need to be specified. Eric Feldl has the action to define the specifications.

2) Quad adjustment system will be done similar to the main machine.

3) Girder design. Four girders were identified to facilitate installation and alignment. Tooling plate for flatness was recommended:

a) Diagnostic girder at the entrance of the full cryomodule.

b) "X" chamber and dipole magnet girder; Upstream.

c) "X" chamber and dipole magnet girder; Downstream.

d) Micro girder to support the quad and BPM upstream of the "X" chamber.

A fifth girder may be needed at the exit of the cryounit to support diagnostics [ multi-slit, electrostatic precipitator, OTR] and QJ magnet.

4) Bellows and diaphragm flanges added to facilitate installation and alignment.

5) Ion pumps should be purchased with roughing ports.

6) All metal right angle valves should be located on each pump cross.

Vacuum Regions defined:

Vacuum regions were defined for the 10^-8 Torr and the 10^-9 Torr. (ref.: layout).

Bakeout region and philosophy defined:

The region for bakeout was defined to accommodated the defined vacuum regions. The bakeout philosophy is as follows:

1) All beamline and chambers will be prebaked at 150 - 200C at vacuum off line, capped of and stored for future assembly.

2) Installation of the components would be done under a clean hood and let to atmosphere with dry nitrogen. After installation, if the vacuum level is not sufficient, a 100-120C bake for an extended period of time (TBD) would be performed.

The issues described above will be integrated into a revised "Sector 1" layout for review and approval. The need for approval will facilitate configuration control and a progressive design.

New Action Items from the Diagnostics/Commissioning Meeting:

Supply details of current monitor..

Web Items:

G. Biallas - Examine categories and recommend changes. No Progress.

G. Biallas - Get minutes and schedules to the Web. No progress.

C. Bohn - Get bunch lengths to the Web. No progress.

Enclosures:

Preliminary Agenda, IR-FEL Vacuum System Review

IR-FEL Vacuum Specification (Draft)