successful completion of six cavity test with the hins accelerator n.
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Successful Completion of Six-Cavity Test with the HINS Accelerator. Six-Cavity Beam Line. HINS six-cavity beam line constructed on the east side of MDB. Beam line can test concept of driving multiple cavities with a single RF amplifier.

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Successful Completion of Six-Cavity Test with the HINS Accelerator


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six cavity beam line
Six-Cavity Beam Line
  • HINS six-cavity beam line constructed on the east side of MDB.
  • Beam line can test concept of driving multiple cavities with a single RF amplifier.
  • Significant cost savings may be realized by using fewer RF power amplifiers.
slide3

Vector (I/Q) Modulator:

Modulates phase and amplitude independently:

With  = (2 - 3)/2

 = (2 + 3)/2

Output power ~ cos2()

Output phase ~ 

water load

circulator

Four Port

Hybrid

Input →

2

1

2

Phase Shifters

Output :←

to circulator and cavity

3

3

4

llrf s ystem setup
LLRF System Setup
  • RF Feedback on RFQ amplitude and phase
  • Feed forward learning correction of Ferrite Vector Modulators
cavity probe signals
Cavity Probe Signals
  • RFQ RF Feedback ON
  • FVM Control OFF
  • Beam ON (7 mA)

Magnitude (MV)

Phase (degrees)

Beam Off at 300 us

*Buncher 1, Cavity 2, and Cavity 3 were detuned so that the FVM’s have enough dynamic range to compensate disturbances.

cavity probe signals1
Cavity Probe Signals
  • RFQ RF Feedback ON
  • FVM Control ON
  • Beam ON (7 mA)

Magnitude (MV)

Phase (degrees)

*Cavity 1 FVM correction did not completely converge due to limited dynamic range of FVM

rfq magnitude and phase regulation
RFQ Magnitude and Phase Regulation
  • RFQ RF Feedback ON
  • FVM Control ON
  • Beam ON

RFQ Magnitude

RFQ Phase

+/-1%

Pulse to Pulse Average of RMS Error

(50 Pulses)

Pulse to Pulse Average of RMS

phase Error = 0.0147 degrees

Pulse to Pulse Average of RMS magnitude Error = 0.0207%

beam energy stability
Beam Energy Stability
  • Difference between green and red trace show time-of-flight between diagnostic line BPMs.
  • Energy scale is ~1.4keV/degree for time of flight BPM measure-ments. Plot shows noise level of about 10keV for 3MeV beam.
contributors
Contributors
  • AD
  • HowiePfeffer
  • GeorgeKrafczyk
  • Mike Kucera
  • Brad Claypool
  • Jim Patrick
  • AndreyPetrov
  • Bill Marsh
  • Charlie Briegel
  • Dennis Nicklaus
  • Denise Finstrom
  • Carl Schumann
  • Stan Johnson
  • Todd Johnson
  • Aisha Ibrahim
  • Roger Tokarek
  • Duane Voy
  • Nathan Eddy
  • Peter Prieto
  • Andrea Saewert
  • Lionel Prost
  • AD
  • Bob Webber
  • Jim Steimel
  • Bruce Hanna
  • Vic Scarpine
  • Alex Chen
  • Bruce Popper
  • Maurice Ball
  • AbhishekDeshpande
  • Dave Peterson
  • Ralph Pasquinelli
  • Elmie Evans-Peoples
  • Wai-Ming Tam
  • Brian Chase
  • JulienBranlard
  • Paul Joireman
  • Ed Cullerton
  • Vitale Tupikov
  • Philip Varghese
  • Chris Jensen
  • Kevin Martin
  • Steve Hays
  • APC
  • Robyn Madrack
  • Dave Wildman
  • HenrykPiekarz
  • Jean-Paul Carneiro
  •  Al Moretti
  • Nikolai Mokhov
  • TD
  • Giorgio Apollinari
  • Gennady Romanov
  • TimergaliKhabiboulline
  • IouriTerechkine
  • Leonardo Ristori
  • Tom Page
  • Tom Nicol