1. Current status of high k scattering system J. Kim 1, Y. Ren 2, K-C. Lee 3 and R. Kaita 2 1) POSTECH 2) PPPL 3) UC Davis NSTX Monday Physics Meeting LSB-318, PPPL July 27, 2009 NSTX Supported by College W&M Colorado Sch Mines Columbia U CompX General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics New York U Old Dominion U ORNL PPPL PSI Princeton U Purdue U SNL Think Tank, Inc. UC Davis UC Irvine UCLA UCSD U Colorado U Illinois U Maryland U Rochester U Washington U Wisconsin Culham Sci Ctr U St. Andrews York U Chubu U Fukui U Hiroshima U Hyogo U Kyoto U Kyushu U Kyushu Tokai U NIFS Niigata U U Tokyo JAEA Hebrew U Ioffe Inst RRC Kurchatov Inst TRINITI KBSI KAIST POSTECH ASIPP ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching ASCR, Czech Rep U Quebec

2. NSTX NSTX Monday Physics Meeting – Current status of High k (Kim)July 27, 2009 2 Topics related to high k system performance Upgrade for remote control of optics Data acquisition system Status of Channel 3 Scattered signal Noise

3. NSTX NSTX Monday Physics Meeting – Current status of High k (Kim)July 27, 2009 3 Status of Remote Control Upgrade for remote control of optics –Launch Mirror horizontal sweep  X  Need to purchase new drive component to provide higher torque –Launch Mirror vertical sweep  O (operational) –Collection Mirror horizontal sweep  O (operational) –Exit Window Mirror horizontal sweep  O (operational) –Exit Window Mirror vertical sweep  X  Not needed –Attenuation control  X  Under design

4. NSTX NSTX Monday Physics Meeting – Current status of High k (Kim)July 27, 2009 4 Improvement of Data Acquisition System DAQ Related to order data from digitizers were archived after each shot –After adding another D-tAcq board for FIReTIP to the high k pc, DAQ errors occurred more frequently than before.  Task Force figured out the problem immediately and effectively.  Related to order data from digitizers were archived after each shot

5. NSTX NSTX Monday Physics Meeting – Current status of High k (Kim)July 27, 2009 5 Status of Channel 3 Mixer for Channel 3 not working –No replacement at PPPL or UC Davis –Mixer sent to UC Davis for repairs All four other channels operational

6. NSTX NSTX Monday Physics Meeting – Current status of High k (Kim)July 27, 2009 6 Issues with Scattered Signal No problem in getting scattered signal –Alignment of system being checked periodically

7. NSTX NSTX Monday Physics Meeting – Current status of High k (Kim)July 27, 2009 7 Scattered signal Wed, Jul 22, 2009 (XMP26) R~ 120 cm

8. NSTX NSTX Monday Physics Meeting – Current status of High k (Kim)July 27, 2009 8 Scattered signal (continued) Fri, Jul 24, 2009 (XMP26) R~ 120 cm

9. NSTX NSTX Monday Physics Meeting – Current status of High k (Kim)July 27, 2009 Scattered signal (continued) Mon, Jul 27, 2009 (XP916) R~ 120 cm

10. NSTX NSTX Monday Physics Meeting – Current status of High k (Kim)July 27, 2009 High-k Noise High-k has bursting >1 MHz noise. The high-k noise spectra resemble that of a scattering signal. Ch1 Ch2