Progress in Chamber Simulation Experiments At UCSD Laser Facility Farrokh Najmabadi and Kevin Sequoia HAPL Meeting February 5-6, 2004 Georgia Institute.

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Presentation transcript:

Progress in Chamber Simulation Experiments At UCSD Laser Facility Farrokh Najmabadi and Kevin Sequoia HAPL Meeting February 5-6, 2004 Georgia Institute of Technology Electronic copy: UCSD IFE Web Site:

Status of Diagnostics Development and Fielding From last HAPL Meeting:  High temperature sample holder has been operational for quite some time.  RGA system was installed on the chamber and is routinely used to monitor chamber environment. No trace of W was found in the chamber (from heating filament of the high-temperature sample holder).  QMS was tested but has been removed form the chamber until we are ready for test runs.  Fast Optical Thermometer: Proof-of-principle was demonstrated about Last Feb. Focus of our effort has been on improving system reliability and user friendliness: Major progress, unexpected problem. From last HAPL Meeting:  High temperature sample holder has been operational for quite some time.  RGA system was installed on the chamber and is routinely used to monitor chamber environment. No trace of W was found in the chamber (from heating filament of the high-temperature sample holder).  QMS was tested but has been removed form the chamber until we are ready for test runs.  Fast Optical Thermometer: Proof-of-principle was demonstrated about Last Feb. Focus of our effort has been on improving system reliability and user friendliness: Major progress, unexpected problem.  We have developed a highly reliable, fast optical thermometer!

Schematic of Multi-Color Fiber Optical Thermometer System is configured as three independent two- color thermometer

Calibration of Thermometer  NO! Fibers! From last HAPL Meeting:  Test 1: Successive calibration: the basis for developing calibration protocol.  Test 2: Chamber installation test: thermometer is removed from calibration stand, mounted in the chamber, returned to calibration stand. Calibration held in repeated tries  Test 3: Long-term reliability, i.e., how long the calibration is holding. Calibration was lost in the hour time scale: limited set of data; maximum deviation is ~20%, data is stochastic. Likely problem are the PMTs. From last HAPL Meeting:  Test 1: Successive calibration: the basis for developing calibration protocol.  Test 2: Chamber installation test: thermometer is removed from calibration stand, mounted in the chamber, returned to calibration stand. Calibration held in repeated tries  Test 3: Long-term reliability, i.e., how long the calibration is holding. Calibration was lost in the hour time scale: limited set of data; maximum deviation is ~20%, data is stochastic. Likely problem are the PMTs.  Temperature is calculated from measurement of radiated energy at two wavelengths: Thermometer is calibrated with a tungsten lamp

The New Design Uses a Single Fiber Coupler Between the Head and Splitter/Detector Assemblies  The optical signal is split in the detector assemblies as opposed to the head.  We have achieved excellent reliability!  Bonus: A factor of 2-4 reduction in fiber insertion loss!  The optical signal is split in the detector assemblies as opposed to the head.  We have achieved excellent reliability!  Bonus: A factor of 2-4 reduction in fiber insertion loss! Single fiber from head to splitter/detector Band-pass filter/focuser PMT Expander/ neutral filter splitter PMT

Thermometer Held Its Calibration Over a 12-day Reliability Test Run!  Over 100 measurements over a 12 day period including a partial assembly/disassembly!  Less than ± 1% change in calibration constant  Over 100 measurements over a 12 day period including a partial assembly/disassembly!  Less than ± 1% change in calibration constant Partial Assembly/disassembly

The Head and Splitter/Detector Assemblies Are Packaged in Robust, Low-Profile “Packages” Shorter head. PMTs Band-pass filter/ Collimator/focuser Splitter Fiber

Armor Irradiation Test Will Begin in Late February in Our New Laboratory  Armor Irradiation tests has been deferred because of the failure injection seeding system of our laser. For the same laser energy: With no injection seeding, temporal profile of target temperature fluctuates by 10% due to ns temporal variation in laser pulse. With no injection seeding, peak target temperature varies by ~10-15% (shot to shot).  We will begin armor testing after installation of new injection seeder in our new laboratory.  Armor Irradiation tests has been deferred because of the failure injection seeding system of our laser. For the same laser energy: With no injection seeding, temporal profile of target temperature fluctuates by 10% due to ns temporal variation in laser pulse. With no injection seeding, peak target temperature varies by ~10-15% (shot to shot).  We will begin armor testing after installation of new injection seeder in our new laboratory.

From a Vivarium to a Laser Lab – An Odyssey! After animals were removed. What a smell! 6 Months Later! Demolition is over and construction has begun! One of the construction crew hanging around! (Construction was completed 3 months behind schedule!) Finally!