8/10-14/98

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J. Cook, D. Helms, W. Skinner
Division (M7), FEL Coordination Group
F. Dylla
IR Demo Project Weekly Report, August 10-14, 1998
August 14, 1998

This past week was spent with round-the-clock operations from last Friday (August 7) through yesterday evening. Highlights for the week include: (1) achievement of 0.6mA of cw current through the entire machine into the energy recovery dump; (2) cw lasing at low power with energy recovery; and (3) final preparations for the International FEL Conference next week.
Next week (Aug. 16-21), the laboratory will host the 20th International FEL Conference in Williamsburg, VA. Over 270 scientists have registered for the conference which will include poster sessions and tours of the FEL Facility on Aug. 20.
Installation/Maintenance Activities
There were no scheduled installation/maintenance periods during the last week of operations. Installation of the Analog Monitoring System has started. Software control of the AMS oscilloscopes is now available and was used during this week's operations.
Commissioning Activities
This week we continued to run electron beam in the recirculation mode with the goal of improving beam transmission and beam quality throughthe recirculation and energy recovery hardware. By Thursday evening, when we shut down operations one day later than planned due to a gun arc fault, we had achieved a maximum cw current in the energy recovery mode of 0.6mA. We had several periods of testing cw lasing at low laser power (6 watt maximum). Higher powers will have to wait until the electron beam transmission is improved during the next operational period.
During this week's operations we worked through the final punch list on the hardware for the Machine Protection System that is devoted to the recirculation mode.
We had originally planned to cease operations on Wednesday evening to complete preparations for the FEL Conference. Operations ceased on Thursday evening when an arc occurred in the gun during high voltage processing. The arc caused a vacuum leak which was subsequently localized to a flange in the HV stack. The coming maintenance period will address a number of gun issues which have been identified to

To:
cc:
From:
Subject:
Date:
Management

J. Cook, D. Helms, W. Skinner
Division (M7), FEL Coordination Group
F. Dylla
IR Demo Project Weekly Report, August 10-14, 1998
August 14, 1998

This past week was spent with round-the-clock operations from last Friday (August 7) through yesterday evening. Highlights for the week include: (1) achievement of 0.6mA of cw current through the entire machine into the energy recovery dump; (2) cw lasing at low power with energy recovery; and (3) final preparations for the International FEL Conference next week.
Next week (Aug. 16-21), the laboratory will host the 20th International FEL Conference in Williamsburg, VA. Over 270 scientists have registered for the conference which will include poster sessions and tours of the FEL Facility on Aug. 20.
Installation/Maintenance Activities
There were no scheduled installation/maintenance periods during the last week of operations. Installation of the Analog Monitoring System has started. Software control of the AMS oscilloscopes is now available and was used during this week's operations.
Commissioning Activities
This week we continued to run electron beam in the recirculation mode with the goal of improving beam transmission and beam quality throughthe recirculation and energy recovery hardware. By Thursday evening, when we shut down operations one day later than planned due to a gun arc fault, we had achieved a maximum cw current in the energy recovery mode of 0.6mA. We had several periods of testing cw lasing at low laser power (6 watt maximum). Higher powers will have to wait until the electron beam transmission is improved during the next operational period.
During this week's operations we worked through the final punch list on the hardware for the Machine Protection System that is devoted to the recirculation mode.
We had originally planned to cease operations on Wednesday evening to complete preparations for the FEL Conference. Operations ceased on Thursday evening when an arc occurred in the gun during high voltage processing. The arc caused a vacuum leak which was subsequently localized to a flange in the HV stack. The coming maintenance period will address a number of gun issues which have been identified to