Beams Document 2317-v4

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Main Injector HLRF Anode Limit Program & Cavity Tuner RF Voltage Limit

Document #:
Beams-doc-2317-v4
Document type:
Note
Submitted by:
Tim G. Berenc
Updated by:
Tim G. Berenc
Document Created:
30 Jun 2006, 11:10
Contents Revised:
14 Sep 2006, 10:49
Metadata Revised:
14 Sep 2006, 10:49
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Other Versions:
Beams-doc-2317-v3
20 Jul 2006, 16:24
Beams-doc-2317-v2
11 Jul 2006, 11:01
Beams-doc-2317-v1
30 Jun 2006, 11:10
Abstract:
Presently the Main Injector (MI) cavity ferrite tuners are protected from RF sparking by taking advantage of the natural saturation of the RF power amplifier (PA). The protection is implemented through an anode limit program (ALP) that limits the PA anode bias. Since the Series Tube Modulator (STM) and RF PA form a series circuit, this ALP function also places a constraint on the STM voltage drop and hence the maximum current that the circuit can withstand before exceeding the power dissipation limits of the STM. The Proton Plan intends to perform multi-batch slip-stacking at injection which will require increased average STM current at the highest STM voltage drop. The STM power dissipation could be relaxed if ALP is raised at injection. This note documents the present and past status of ALP as well as MI-60 test station measurements made on a MI cavity to understand the cavity tuner RF voltage limit.
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Keywords:
main_injector hlrf rf
Notes and Changes:
Added high gap voltage at injection frequency testing results from the MI-60 test station.
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