December 14, 2016 - 4-Laser/LLRF Installation Meeting

We will meet Wednesday Dec 14 @ 10am in TL-1227 for final updates.

Meeting Minutes

Schedule

Dec. 21 : benchmark 4 laser w/ present LLRF, laser amplifiers software upgrade for current control, turn amps off and safe laser for RF upgrade

Jan 3-13 : install new RF control hardware and cabling, install software and update screens, connect to lasers, turn lasers back ON, complete INJ SEG HCO

Jan 17-20 : system commissioning/float, request INJ SEG=BP for beam checkout, add fixes or final improvements, complete 4-laser upgrade, complete INJ/NL HCO

Jan 23-25 : request INJ/NL=BP full energy injector setup, tests w/ 4 beams @ injector

Jan 26 : ready for beam operations

High Level Notables

No spares of critical components, budget for spares being estimated

Existing 3-LLRF will be retained as roll-back, rack chassis left if possible or stored, VME cards retained as-is

Tomasz will submit LLRF ATLIS for comments and tracking of activity

Hardware installation begins first thing Jan. 3; in good shape, but still awaiting amplifiers due before holiday break

Firmware progressing well w/ amplitude and phase set point by EPICS, resolution and stability good (detailed report below)

Additional EPICS integration in January, will be tight to complete (Scott/Rama to assess by holiday, raise flag if problematic); will address how to assign 499/250 to single phase shifter

All on same page that no phase jumps anticipated in running system, however, until MO upgrade too lower freq. expect phase jump w/ power outage, cable change, need procedure for checkout/Ops

Status Updates

Joe - Schedule

Beam Study 12/21 8am-Noon will benchmark e- bunch length and laser power and record archived high level RF parameters (power/phase)

media:161214_LLRF_INSTALL.pptx

Winter SAD

Tomasz - LLRF upgrade status

Rama/Chad - Firmware

progress on firmware

1.PC104 breakout board was tested and is being used with Scott's software and the communication between EPICS and FPGA looks good

2.FPGA is talking to DAC (4-channel), ADC(4 channel) and PC104.

3.Tone mode functionality needed for January is now working. Magnitude and Phase can be set to 4 DAC channels individually from EPICS PVs

4.Magnitude and Phase measured from ADC channels is displayed in EPICS

5.ADC and DAC have enough resolution for control when needed (0.2 degree resolution for phase and 0.5% for magnitude), so there is no need for an extra clock board

tasks in progress for January

1.replacing 4 channel ADC board with 8 channel ADC board. Not needed for January, but will install once testing is done in next couple of days. This will give us the ability to scan all the channels (4 lasers, 70 MHz, 35 MHz)

2.work on screens for OPS

3.procedure for correcting phase, if the phase changes in either 35 MHz or 70 MHz (EPICS level)

4.testing with RF board once the chassis is assembled (in progress)

5.continuing firmware development

Scott - Software

Dave/Manuel - Hardware

Dave - Documentation/Drawings

Michael/John - Current control and remote operation of laser amplifiers

Michele - 4-laser HLAPP

Application ready to test