March 24, 2000:Last week we measured the damage threshold energy for the new ZnSe beam splitter.

August 25, 2000: During the last three weeks, our HGHG study achieved major success in 4 different subjects:

April 14, 2000: Adnan and Marcus’s autocorrelator got a preliminary measurement for the HGHG pulse length measurement.

November 20, 2000: During the last three weeks, our HGHG study achieved major success in 4 different subjects:

March 12: All mirrors in the radiator were changed to the improved design. Two of the new mirrors do not meet the specifications and must be replaced.

July 30: Thursday (July30) we run SASE for the first time with the Pockels cell turned on, so there are double pulses from YAG laser, one for the RF gun, the other for the CO2 switching.

March 19: Adnan Doyuran and Erik Johnson worked on characterizing the mirrors and came to the conclusion that only number 3 was a really bad mirror.

August 6: Thursday and Friday we managed to synchronize the CO2 laser with the electron beam and create a huge energy modulation.

March 26: There was one run this week devoted to the trajectory study.

August 13: On Wednesday we continued the seeding by the CO2 laser started last week.

May 21: On Wednesday we put beam through the HGHG line to make sure that all is well with the system.

August 20: This week we confirmed last Friday's HGHG result and got many new features of the HGHG interaction.

May 28: Yesterday the diving board has been installed, so I started aligning the He-Ne laser.

October 8: The experiment is moving closer toward measuring a single-shot spectrum. A preliminary result is given in the following figure:

June 4: We had a very good round and stable beam. The charge was 200 pC.

October 15: Last week during the HGHG experiment we successfully measured the single shot spectral bandwidth.

June 11: This week on Tuesday we did a trajectory study. I started with the vertical trajectory.

October 22: In order to calibrate the attenuators which we used for HGHG experiment we used the doubling crystal with 10 micron CO2 laser.

July 9: Experiment started at about 9:00 AM doing trajectories studies. Since the trajectories program was not ready for 41.5 MeV (correct HGHG energy), a lot of time was spent on deciding what energy to run.

December 3: We nearly get to the point of measuring HGHG pulse length yesterday before we run out of our running time.

July 16: Thursday (July 15 ) we tried SASE at 3.7 micron, and were successful.

December 10 : We attempted to measure the HGHG pulse length Tuesday and Wednesday.

July 23: This week we achieved SASE at 5.3 micron with mini-undulator closed at the HGHG specified gap and with dispersion magnet turned on with specified current range, i.e., the system is operating under the HGHG experiment condition, ready for CO2 seeding.