CC LLRF SM18 test plan and BA6 infrastructure

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Presentation transcript:

CC LLRF SM18 test plan and BA6 infrastructure P. Baudrenghien, J. Bento, B. Kremel, J. Simonin, N. Stapley, BE-RF on behalf of WP 4 Crab Cavity Technical Coordination: meeting XXVI, May 8th, 2017

Outline SPS CC LLRF electronics Lab tests SM18 tests Calendar SPS Infrastructure (Faraday Cage)

SPS CC LLRF electronics (1/2) We use the VME platform first introduced in the LHC LLRF (2007), also used in HIE-Isolde (2015), Linac4 (2016) and some SPS upgrades (2014-2017) We have adapted electronics designed for Linac4 (352.2 MHz RF) for operation at 400.8 MHz The system contains 1 crate with five modules per cavity

SPS CC LLRF electronics (2/2) Hardware (B. Kremel) Clock Gen module ready (2 PCs) Tuner module ready (1 PC) CavLoop modules (field regulation) being adapted for 400.8 MHz Firmware (B. Kremel, J. Simonin) Tuner module ready CavLoop under development Software (N. Stapley) Fesa class for tuner module under development Fesa class for CavLoop not started yet

Lab test A test bench is being prepared in the 864 Lab The tuner is “modeled” by phase-shifter The cavity is modeled in firmware First test is to validate the tuner (software/firmware/hardware) before SM18 test. Now-> mid June.

SM18 tests Our goal is to commission the system as it will be in the machine: FESA, SPS timing, Reference-driven mode, QL=106. Difference is the reduced power (no tetrode) and different cryostat. We will use the vertical cryostat to test the LLRF on the DQW equipped with a mockup tuner. Due to power limitations in SM18, 𝑄𝐿=106 (vs. 5×105 in the machine), with reduced field, using an 100 W amplifier (vs. 50 kW in the machine). Still 10 dBm at Ant. OK First commissioning of the tuning loop, starting mid-June 2017, when cavity returns from Japan. To be finished in 1-2 months (cryo shutdown) Commissioning of the field regulation (including RF feedback), starting Oct after cryo shutdown. The CavLoop module allows for both Self-Excited Loop (SEL) and Reference-Driven mode as intended in the machine.

Tuner test in the lab. Now->Mid June Calendar to-day – Dec 2017 Tuner test in the lab. Now->Mid June SM18 tests (vertical cryostat) Mid June- Mid Aug Setting-up the Tuner Loop Start setting-up the RF feedback SM18 cryo shutdown Mid Aug- End Sept Resume SM18 tests (vertical cryostat) Oct-Dec Complete the setting-up of the RF feedback

Faraday Cage (1/2)

Faraday Cage (2/2)

Technical spec completed (EDMS 00001750664) Technical spec completed (EDMS 00001750664). Waiting for OK from Safety (promised for…today) Commercial documents under preparation. Should be sent by end May 5 bidders selected. We know them…

Calendar for the cage contractor: The “bare” cage should be finished end Oct. 2017 Then rest of installation is done by CERN services Connect cables to patch panel, cabling inside cage Electrical distribution to racks inside Cooling-Ventilation (AC) False floor, installation of racks Networks and Wifi …… Then we install the LLRF VME crates (same as tested in SM18), deploy the software and…test for real….(SPS restart 2018).