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ASTA roadmap to EPICS and other upgrades. Remote monitoring and control DAQ Machine protection Dark current energy spectrometer. High gradient X-band testing of accelerator structures (regularly exceeding 100 MV/m gradient)

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asta roadmap to epics and other upgrades

ASTA roadmap to EPICS and other upgrades

Remote monitoring and control

DAQ

Machine protection

Dark current energy spectrometer

asta accelerator structure test area

High gradient X-band testing of accelerator structures (regularly exceeding 100 MV/m gradient)

  • Up to ~200 MW peak power delivered to the structure by combining the power of two XL4 klystrons into a delay line SLED system.
  • Consists of two modulators, two klystrons, delay lines for SLED, a radiation enclosure, PPS system, interlocked vacuum and cooling water systems, llrf system, diagnostics and data acquisition..
  • In the past used for S-Band RF gun testing incorporating a cathode laser system and small beam line with a beam spectrometer.

ASTA: Accelerator Structure Test Area

slide3

llrf configuration

AFG

I&Q

MIXER

TWT

K

no SLED

SRS

60 Hz

SRS

DG645

4 port combiner

SLED

AFG

I&Q

MIXER

TWT

K

slide4

K

K

high power

rf configuration

breakdown rates vs gradient
Breakdown rates vs gradient

forward power

reflected power

faraday cup 1

faraday cup 2

Faraday cup signals register breakdowns and inhibit further pulses to prevent damage to the structure.

Gradient is calculated.

slide6

DAQ/MPS

existing configuration

VAC controllers

VAC1-2: Klystron

VAC3-16: WG to DUT to load

MPS

Trigger inhibit(soft)

Modulator trip(hard)

Power meters

Faraday cup signals

DUT FE/RE

Klystron RE

daq mps issues
DAQ/MPS issues
  • High bandwidth DAQ and MPS handled by one windows computer running several labview/C++ programs
    • data bottleneck causes missed MPS triggers
    • no data sharing or analysis possible during running
    • Complexity of the labview programs cannot be easily modified or scaled up
upgrading asta

Operational upgrades are required to satisfy existing and new user demands:

SLAC X-band program, CERN, Japan, LCLS RF gun cathode characterization.

Improved DAQ: user and operations access to real time and archived data: (EPICS a la LCLS, dedicated network). Correlate everything with everything else.

Extract phase information to track breakdown locations within the structure.

Real measurement of achieved gradient and dark current energy spectrum.

Unattended and remote operations (a la NLCTA with a fire suppression system)

Go to PAC/PAD llrf system

Reestablish S-band RF and UV laser systems

Upgrading ASTA

slide10

DAQ/MPS

proposed configuration

VAC controllers

VAC1-2: Klystron

VAC3-16: WG to DUT to load

MPS

Trigger inhibit

Modulator trip(hard)

Power meters

Faraday cup signals

DUT FE/RE

Klystron RE

daq mps upgrades
DAQ/MPS upgrades
  • EPICS handles most of the DAQ and MPS
    • Remote monitoring and operation
    • Complex labview programs continue to operate with EPICS IO Server for LabVIEW
    • Move LabVIEW functionality to EPICS
gradient measurements
Gradient measurements

Existing spectrometer is a damping ring magnet designed for 200 MeV gun testing. Unwieldy.

Maximum of ~20-40 MeV of dark current expected for single small accelerator structure testing. which could be handled by a more compact spectrometer.

use spare nlcta chicane magnet
Use spare NLCTA chicane magnet

2 hours of work to put together (D. Walz)

slide14

Faraday cups on the straight ahead line to measure total charge

Electrodes on offaxis lines for intensity

Add an additional pumpout port to get the device closer to the structure

Provision for small water cooling lines or lower duty cycle to achieve higher fields.

where we are with daq mps
Where we are with DAQ/MPS

Infrastructure:

ADC modules, VME crate, terminal server, GPIB interface, EPICS computer, network switch and network are on hand or in place.

Set up EPICS:

Require some expertise in setup. Install and configure the EPICS software. Write or install drivers.

where we are with phase extraction
Where we are with phase extraction

Feasibility study shows phase can be extracted. Further study ongoing to see if we have the resolution to determine breakdown location.

Implementation is next (January 2011).

Reflected energy envelope during a breakdown

Computed phase

upgrading asta big ticket items

Real measurement of achieved gradient and dark current energy spectrum:

    • Magnet is available. Vacuum chamber in preliminary design stage. After $, its a one month timescale for final design and fabrication
  • Unattended and remote operations (a la NLCTA with a fire suppression system)
    • Modulators have been evaluated for fire protection. $$
    • BAS ASE changes to follow NLCTA precedent.
  • PAC/PAD system being implemented in NLCTA. Can it be used for experimental DAQ?
  • Reestablish S-band RF and UV laser systems. $$$
    • Waveguide can be reconnected.
    • TS1 changed to dedicated S-band
    • PPS upgraded and/or re-commissioned
    • Laser systems
    • EPICs will allow easy porting of LCLS apps

Upgrading ASTA: big ticket items

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