MEMORANDUM
To: Distribution
From: F. Dylla
Subject: Monthly Report IR Demo FEL Upgrade and Commissioning
Project, August 1997
Date: September 25, 1997
Management
August 1997 was the first month for the $3.7M IR Demo FEL Upgrade
and Commissioning project. Funds for the project were received
by DOE and Jefferson Lab was given the authorization to proceed
on August 5, 1997. Cost and schedule performance are described
in the accompanying "Performance Assessment" report
by Gordon Smith. Four cost accounts with appropriate task identification
and earned value for task completion were established for the
project. A summary of the technical progress in three of the
four cost accounts is given below. The fourth cost account "IR
FEL Commissioning" has no scheduled activity until October
1997.
CA 221: Scaleable Optical Cavity
No peg point was scheduled for the account in August. The team
responsible for the design and commissioning of the optical cavity
for the baseline IR Demo FEL will be responsible for the work
in this cost account. The scope of the effort involves the design
of a scaleable optical cavity that will allow the IR Demo FEL
to handle higher powers than the 1kW power level of the baseline
device. Key components of the chosen optical cavity will be fabricated
by project completion. (The allotted funds were insufficient
for completion and testing of a full optical cavity system.)
Effort was started on a conceptual design for the scaleable optical
cavity based on the team's previous assessment of the R5 concept
and the experience gained with the fabrication and component testing
for the IR Demo optical cavity.
CA 321: Upgrade Cryomodule System
The scope of this cost account involves the fabrication of a second
cryomodule for the IR Demo FEL. This second cryomodule is largely
a copy of the cryomodule built for the baseline IR Demo project,
except for incremental improvements in cryomodule hardware that
have been generated by the SRF team as a result of development
efforts for the first FEL cryomodule and for the CEBAF energy
upgrade project. One specific improvement that has been identified
for incorporation in the upgrade FEL module is the use of "dogleg"
couplers in the fundamental power interface. These couplers have
shown in cavity performance tests a several order of magnitude
decrease in window secondary emission current with subsequent
improvement in susceptibility to window arcing at high fields.
During the month of August, the procurement process for long
lead components for the upgrade cryomodule was initiated.
CA 421: Commissioning Preparations
The scope of this cost account involves hardware, software and technical support activities to prepare the IR Demo for start-up of commissioning activities in October 1997. Items that were accrued to this account in support of commissioning preparations in August included: (1) an 8 kW cathode power supply that would enable the IR Demo RF system to support 1mA beam currents during the linac commissioning phase. (The standard 5kW power 1inac RF supply can only support a beam current of 0.6 mA in a non-recirculated mode). This larger beam current enhances the potential FEL gain during the first-light commissioning effort, (2) partial credit was taken for an Analog Monitoring System (AMS) and additional electron beam diagnostics (BPM's and viewers) that will enhance the commissioning process, (3) partial credit was taken for modifications to baseline magnets and additional corrector magnets to enhance lattice performance, (4) software development above the baseline effort was added to support additional diagnostic capability and planned commissioning procedures and (5) magnetic measurement capabilities were enhanced and additional magnetic measurements were made to fully characterize the custom dipole magnets being installed in the IR Demo. The above activities under the scope of this cost account will be complete in October 1997 prior to the start of commissioning.