Transcript RF at Maxlab & MAX4

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
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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 GeV Linac
Short Pulse Facility
1.5 GeV
ring
3 GeV
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 E37310
• 18 acceleration units, supplied by RI Research Instruments
GmbH, 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
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:
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YAG screens
BPM
ESLS RF Grenoble, October 5-6, 2011.
Lars Malmgren
3 GeV and 1.5 GeV RF Stations
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Block diagram of the 3 GeV RF system
Commercial 60 kW FM transmitter can
be used in both the 3 and 1.5 GeV rings.
In the 3 GeV ring each RF station
consists of two combined transmitters
In the 1.5 GeV ring an identical single
60 kW 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
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 kW. 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
300 MHz Symmetric Capacity-loaded Landau Cavity for MAX-IV,
F = 301.39175 MHz
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f = 300 MHz
Theory:
Rsh = 5.8 Mohm
Q = 21800
0
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C: \L ANL \E XAM PL ES \RA DI OFR EQ UEN CY \MY 30 0MH ZS YMM _3 \P ILL 10 0.A F
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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
Extra
plunger for
safe MAX-III
operation.
ESLS RF Grenoble, October 5-6, 2011.
Lars Malmgren
Digital Low Level RF
A n a lo g T im in g
S yste m
PC I Bus
D ig ita l T im in g S yste m
75M H z
16 ADCs
75M Hz
8 ADCs
75M Hz
75M H z
100M H z
FPGA
D ig ita l IQ D e m o d u la tio n
FPGA
IQ C trl
IO T 1 &
IO T 2
D ig ita l IQ D e m o d u la tio n
a n d C o n tro l L o o p s
A n a lo g
F ro n t E n d
DC
8DACs
75M Hz
Up
C o n ve rsio n
T u n in g C o n tro l L o o p
C o n tro l
In p u ts
100M H z
R F C a vity F o rw a rd P o w e r
C A V IT Y
D ia g n o stics
In p u ts
R F C a vity V o lta g e
1 0 R F D ia g n o stic S ig n a ls
T e tro d e
M o to r
C o n tro lle r
R F C a vity F o rw a rd P o w e r
R F C a vity V o lta g e
T e tro d e
C A V IT Y
1 0 R F D ia g n o stic S ig n a ls
• 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
cPCI format
8 ADCs 125 MHz 14 bits
8 DACs 125MHz 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
High power tests with beam was performed at 19 of
September on the Max III storage ring. The injection
energy was 400 MeV which was ramped to 700 MeV.
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 5MHz rate
•Signals acquired at 0.3Hz rate
•Signals stored in a circular
buffer of 128MBytes (equivalent
to 0.5s 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