The Status of Maxlab and MAX IV RF

The Status of Maxlab and MAX IV RF Systems Lars Malmgren On behalf of the Max-lab RF team ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Outline • • • MAX IV overview Status at construction site Linac Main cavity Higher harmonic cavity Digital low level RF ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

MAX IV ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

MAX IV overview Start 3. 5 Ge. V Linac Short Pulse Facility 1. 5 Ge. V ring 3 Ge. V ring ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Construction site At the MAX IV Site. In Accelerator Pit at the Electron Gun Position towards Beamdump. Photo: Annika Nyberg, MAX IV Laboratory, 2011 -09 -28. ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Linac • Total length 275 m • 18 S-band RF units (klystron+ solid state modulator) supplied by Scandinova, Uppsala, Sweden. Contract signed 11/8/2010. First unit delivered in mid December 2011. • Toshiba klystron E 37310 • 18 acceleration units, supplied by RI Research Instruments Gmb. H, Bergisch Gladbach, Germany, consisting of SLED (18 units), power devider (20 units) and Linac sections (39). They are delivered conditioned. Contract signed 15/07/2010. Delivery of the first unit in March 2012. • First RF unit feeds two guns and one linac structure. The rest, except the last two are feeding two linac structures each. The last two feeds four linac structures. • Installation is expected to begin March 2013 ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

RF unit v. S-band RF Unit parameters MAX IV Laboratory, 11. 06. 14. D. Kumbaro ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Gun test stand • Test of high brightness gun • Test of linac diagnostics: • • • YAG screens BPM ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

3 Ge. V and 1. 5 Ge. V RF Stations • • • Commercial 60 k. W FM transmitter can be used in both the 3 and 1. 5 Ge. V rings. In the 3 Ge. V ring each RF station consists of two combined transmitters In the 1. 5 Ge. V ring an identical single 60 k. W transmitter would constitute the RF station It is a advantage with a modular RF system for the MAX IV rings. Circulators will be used in both rings to isolate the cavity from the transmitters Block diagram of the 3 Ge. V RF system ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Procurement main cavities & couplers • We have ordered 8 main cavities from Research Instruments (RI). Delivery before Christmas! • We have order 8 input power couplers of DORIS type from RI. Should safely handle 120 k. W. Delivery Feb 2012. • We will need 16 HOM couplers. The intention is to give a design idea to RI, who will fabricate an invacuum prototype for tests. Put on ice! ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Procurement Landau cavities • A contract is signed stating an agreement between MAX and RI of ”common activities” in order to reduce a given ceiling price for 6 Landau cavities. This includes finalizing the MAX-lab prototype Landau. Prototype now in house! ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Landau cavity prototype f = 300 MHz Theory: Rsh = 5. 8 Mohm Q = 21800 Å. Andersson ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Landau cavity design The prototype is ready f = 300 MHz Practice: Rsh = 5. 6 Mohm Q = 21000 Mechanical design; Elsayed Elafifi, MAX-lab ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Assembly of central rods Assembly of the water cooled rods with capacitor plates. Two with fixtures for EB welding mounted. ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Backplate Back plate after EB welding and turning. ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Turning the inside of the cavity The shell is made of two halves that are EB welded together. This picture shows the final cut taken in the lath. ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Landau cavity with tuning mechanism The prototype is ready to be installed in Max III ESLS RF Grenoble, October 5 -6, 2011. Extra plunger for safe MAX-III operation. Lars Malmgren

Digital Low Level RF • A digital low level RF(DLLRF), based on the ALBA LLRF, has been developed by Angela Salom and Antonio Milan, ALBA in corporation with Max-lab • It controls the amplitude and phase of cavity voltage and resonance frequency (Tuning) • Each DLLRF controls two RF stations • 10 RF diagnostic signals per RF station ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

The DLLRF hardware FPGA from Lyrtech, VHS ADAC-4 c. PCI format 8 ADCs 125 MHz 14 bits 8 DACs 125 MHz 14 bits Virtex 4 128 Mbytes RAM 16 ADCs and FPGA for Diagnostics ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

High power tests with beam was performed at 19 of September on the Max III storage ring. The injection energy was 400 Me. V which was ramped to 700 Me. V. The ramping was done with all feedback loops running and the beam survived. We will continue the testing when there is a possibility. Unfortunately there is not much time available due to user operation. ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Diagnostics Fast Diagnostics Slow diagnostics • Signals acquired at 5 MHz rate • Signals acquired at 0. 3 Hz rate • Signals stored in a circular buffer of 128 MBytes (equivalent to 0. 5 s of operation) • Archiving for historical purposes • Slow trend analysis • Used for post mortem analysis and transient studies Control System in Tango ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren

Thanks for your attention Questions? ESLS RF Grenoble, October 5 -6, 2011. Lars Malmgren