___________________________________________________________
Plan for 40m bake-out.      AJW, v1.1, 9/7/99.

After Michigan expt (9/15) and before vent (~10/15):

- Catalog (on computer) all detector equipment,
  both inside and outside of vacuum envelope.
  Determine disposition: 
  re-use, ship elsewhere, store clean, store "dirty", etc.
  Find a semi-permanent storage place for surplus equipment!
  (Vass)

- Preclean accumulated surplus equipment from 40m:
  Coherent lasers, various unused parts
  (Vass)

- Find and assemble all existing drawings of 
  vacuum chambers, stacks, other vacuum elements.
  Ideally, in electronic form.
  Update and annotate, and submit to DCC.
  (Vass, Althouse, Craig Conley).

- Build new vacuum control system,
  using existing pumps, gauges, valves.
  - hardware/software interface: 
    VME crate, CPU, SADCs, BIOs, SDACs.
    (Heefner, Bork, Weinstein, etc)
  - Wiring to new hardware/software interface.
    (Heefner, Bork, Vass, FroshSURF).
  - EPICS software:
    Data base, state machine, GUI.
    (FroshSURF, Weinstein, Heefner, Bork).
  - Operational modes: protected, unprotected, fully automatic
  - Test everything, offline, not connected to hardware.
    (FroshSURF, Weinstein, Heefner, Bork).

- Procure 5 computer-controlled pneumatic gate valves
  (clean) for ion pumps, pressure-interlocked to 10-6 torr.
  (Vass)

- Select heater jackets from LIGO chamber bakeout.
  Make use of their controllers and associated equipment, 
  operating with existing lab 480V power.
  Bring all that equipment to Caltech, and test.
  (Vass, Althouse).

- Design a system for jacking up the entire vacuum system
  by ~6in, to permit heating jackets under the chambers.
  Procure all necessary equipment.
  (Vass, Althouse. Larry Jones)

- Procure new optical table for output chamber.

- Receive and validate (bake and RGA screen) 
  new metal springs and flurel seats.

- Update calibration leaks to LIGO variety

- Establish and document vacuum / contaminant level
  with existing system, under vacuum.

During vent (~10/15/99 - ~3/2000)

- Vent vacuum system.
  (Althouse, Vass, Weinstein, Ugolini).

- remove all detector equipment, store.
  (Althouse, Vass, Weinstein, Ugolini).

- remove ion pumps, replace with blank plate.
  (Althouse, Vass, Weinstein, Ugolini).

- regenerate ion pumps individually with small turbopump.
  (Althouse, Vass, Weinstein, Ugolini).

- disassemble stacks, measuring all dimensions
  and weighing all stack elements.
  (Althouse, Vass, Weinstein, Ugolini).

- Zero tortional deflection of bellows on all chambers
  and test spare one for maximum limit.
  (Althouse, Vass, Weinstein, Ugolini).

- Update or create new drawings to correctly
  represent the stacks, chambers, etc.
  (Althouse, Vass, Craig Conley).

- Machine new stack elements for one-leg stack for new output chamber.
  Machine present stack elements & top plates to accomodate
  metal springs.
  (Althouse, machinists).

- Assemble and install new output chamber.
  (Althouse, Vass, Weinstein, Ugolini).

- RGA analysis of empty vacuum chamber with support beams and plates
  to determine bake need.
  (Althouse, Vass, Weinstein, Ugolini).

- jack up entire vacuum system ~6 in
  (including stack support beams/legs).
  (Althouse, Vass, Weinstein, Ugolini).

- Connect and commission new vacuum control system;
  test EPICS control and data logging.
  (Weinstein, Heefner, Bork, Ugolini).

- Wrap entire vacuum system with heating jackets,
  connect all controllers, instrumentation.
  (Althouse, Vass, Weinstein, Ugolini).

- Place all stack elements, optical tables, 
  ion pump/gate valve assemblies,
  (springs? detector elements?) in a heater jacket
  on the floor (OR send to commercial vendor for cleaning and baking).
  (Althouse, Vass, Weinstein, Ugolini).

- Install new dry-clean air purge vent system.

Bake-out (3/2000):

- Bake for 2-4 weeks, monitoring everything,
  logging to disk/tape, documenting everything.
  (Althouse, Vass, Weinstein, Ugolini).

- Document state of vacuum / contaminants.
  (Althouse, Vass, Weinstein, Ugolini).

- Disassemble, remove, and store bake-out jackets,
  controllers, and other equipment.
  (Althouse, Vass, Weinstein, Ugolini).

- Vent system with clean, dry air.
  (Althouse, Vass, Weinstein, Ugolini).

- Assemble all stacks and optical tables,
  measuring and documenting all dimensions.
  (Althouse, Vass, Weinstein, Ugolini).

- Install ion pumps and gate valves,
  connect to new vacuum control system.

- Seal and pump down vacuum system, commission ion pumps.
  Maintain vacuum until ready for detector installation.
  (Althouse, Vass, Weinstein, Ugolini).

COSTS:

- Manpower (Vass, Conley, Ugolini, etc)
- Gate valves for ion pumps
- misc control hardware
- heater jackets & controllers for ion pump regen
- VME-based control system (crate, cpu, modules, cables)
- electrician to connect/disconnect 480V
- new optical table
- metal springs and seats ($53.6K)
- new stack elements, remachine existing stack elements ($30K?)
- packing & shipping heater jackets and controller ($10K?)