hprf at pip2it
TRANSCRIPT
A Partnership of:
US/DOE
India/DAE
Italy/INFN
UK/UKRI-STFC
France/CEA, CNRS/IN2P3
Poland/WUST
Victor Grzelak
PIP2IT Retreat
May 6th 2021
HPRF at PIP2IT
HPRF goals at PIP2IT
1. To test and qualify the amplifiers
– All frequency and powers of amplifiers were operated to achieve PIP2IT beam goals
– Prototype SSR1 amplifiers from DAE-ECIL were qualified and installed in PIP2IT as soon
as they were received.
2. To test and qualify the HPRF distribution systems
– These systems performed well
3. To test the integrated RF system, LLRF, RFPI, HPRF, SRF and Controls with
beam
– Each stations were operated in pulsed, CW, with and without beam.
System Overview
5/6/2021 PIP2IT Retreat2
• RFQ
– (2) 75kW 162.5MHz amplifiers (Sigma Phi)
– (2) 75kW Circulators (Ferrite)
• Buncher
– (3) 3kW 162.5MHz (Comark)
– (3) 7kW Circulator (McManus)
• HWR
– (8) 7 kW amplifiers (Tomco)
– (8) 7kW circulators (McManus)
• SSR1
– (8) 7kW 325MHz amplifier (DAE-ECIL)
– (8) 28kW circulators (McManus)
System Overview
5/6/2021 PIP2IT Retreat3
RFQ HPRF
5/6/2021 PIP2IT Retreat4
• RFQ Amplifiers had 3 separate DC power supply failures via IGBT failures
– Appears to be an end-of-life issue, further investigation underway
– Propper preventative maintenance should address these concerns
• Corrosion issues on the can-bus caused controls issues
– Dave was able to address this for the time being
– Sigma Phi controls upgrade is being discussed, and will be conducted at F0
• Roof blocks trapped directional coupler, which made for some tricky
measurements.
• Buncher amplifier cross talk remains a potential issue
– Bad cables were the cause of some earlier issues
RFQ and Buncher HPRF
5/6/2021 PIP2IT Retreat5
HWR HPRF
5/6/2021 PIP2IT Retreat6
• HWR amplifiers were quite reliable
• Bias coupler issue on cavity 3, now has 3-fold protection in place
– DC PS local trip at 2mA
– PLC permit will trip at 2mA
– RFPI fast current trip 2mA
• RF leak issue – mentioned by Joe
– Two cave antennas per cryomodule are part of the RFPI system
– RF leak check on HPRF system part of ORC and documented in travelers
– Component in question needs redesign
HWR HPRF
5/6/2021 PIP2IT Retreat7
SSR1 HPRF
5/6/2021 PIP2IT Retreat8
• All SSR1 cavities were powered by DAE-ECIL in kind contribution
• Fuse failure upon initial turn on,
– Replacement fuse holders and new fuses installed in compliance with US electrical code
• SSR1 Amplifiers had (15) DC power supply failures
– 12 appear to be from a short on the control power board internal to the PS
– Further investigation on the other 3 underway
– Dave Peterson has developed an external control power work around
• RF slice failure near end of run
– Further investigation underway
• Leaking water supplies (Action: internal water connections specified in new TRS)
• Distribution RF leaks found – mentioned by Sasha
– Anodized flanges on the coupler
– HV Bias Tee mechanical issues also caused leaks
SSR1 HPRF
5/6/2021 PIP2IT Retreat9
• Operations Readiness Clearance (ORC) process was streamlined for SSR1, and
process will be repeated for the CM Test facility
1. Pre-ORC Traveler – utilized to verify all (low/no power) interlocks, connections and
acceptance tests [Traveler 464622 Rev B]
2. ORC follows
3. Low power test traveler – operating the RF system at less than 100W for RFPI checkout,
LLRF calibration, powered interlock testing, RF leak checking
4. Pass off to operations/SRF
• User interface for general RF needs more development
Integration- Operations
5/6/2021 PIP2IT Retreat10
• Each amplifier had two separate controls paths, PLC and Ethernet
– The PLC controls were essential for RF operation, various Ethernet issues arose
throughout PIP2IT
• Configurable IP addresses are required, (Action: amplifier requirements modified)
• EPICS control was integrated into HWR and SSR1 amplifier controls
– Pierrick did a nice job
– More integration time will be useful. (Action: F0 Test facility, will have EPICS controls)
Integration- Controls
5/6/2021 PIP2IT Retreat11
Phoebus GUI
5/6/2021 PIP2IT Retreat12
Phoebus GUI
5/6/2021 PIP2IT Retreat13
• Amplifier input padding caused for confusion and clipping on HWR and SSR1
• GDR with beam loading was a great success, more time to analyze the beam
loading would be nice
• LLRF/HPRF/RFPI trip state logic should be better understood
– Planned QPS upgrade would have addressed many of these issues
It’d be helpful to schedule integrated RF system testing early in the process
Integration- LLRF
5/6/2021 PIP2IT Retreat14
• No risks were retired
• RT-121-03-002 – amplifier performance will be more thoroughly addressed at F0
continued testing
Impact on Risk
5/6/2021 PIP2IT Retreat15
• The amplifier technical specifications have been significantly modified to
incorporate lessons learned from PIP2IT operation. Key changes
– Reliability and Maintainability
– Quality control
– Controls
– Electrical Configuration
• RF leak standards added to all RF components and testing integrated into the
process.
• The ORC process at PIP2TF for RF commissioning should follow SSR1 suit.
Summary of Changes Based on Results of PIP2IT Tests
5/6/2021 PIP2IT Retreat16
Amplifiers
• RFQ amplifiers are being moved out to F0 for continued testing, controls upgrades
• HWR amplifiers have no plans for change
• SSR1 amplifier to be routed into powered loads, continued testing and
maintenance will occur
PIP2TF
• First 32kW 650MHz amplifier is being tested at F0
• Next 650MHz amplifier due to arrive at CMTF in June to be used at PIP2TF
Amplifier TRS negotiation
• Ongoing
Summary of Path Forward
5/6/2021 PIP2IT Retreat17