Transcript SINGLE SPLIT DRIVE CHAIN - International Muon Ionization

SINGLE SPLIT DRIVE CHAIN
TH116
POWER SPLITTERS
PHASE SHIFTERS
CIRCULATORS
AND 70db
COUPLERS
TH116 or
TH526
RS2058 ex
SPS AMP
7651 ex RAL
SOLID STATE
DRIVER
POWER SPLITTERS
PHASE SHIFTERS
CIRCULATORS
AND 70db
COUPLERS
TH116
R.F. LEVEL FEEDBACK
LEVEL
CONTROL AND
SOURCE
09th April 2003
R.A. CHURCH RAL
SPLIT DRIVE CHAINS
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The original suggested Split Drive Chain used 4616 tubes to drive the TH116’s
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They are capable of a gain of 20db ( x100 in power) and thus reduce the number of tubes.
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It is possible there may be a long term supply problem with this tube hence the alternative.
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The benefits from twin chains are :-
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Better Amplitude and Phase control
The ability to start with one chain to drive one set of cavities and for the full project just add another
chain with minimum disruption.
To start with one would be able to use the Cern TH116 circuit, the ex SPS Amplifier and the RAL
first driver. The TH781 can be obtained from Thales complete with 200MhZ hardware.
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09th April 2003
R.A. Church RAL
ALTERATIVE SEPARATE DRIVE CHAIN
DRIVE TO 4
CAVITIES VIA
PHASE
SHIFTERS
AND 70db
COUPLERS
POWER
SPLITTERS
AND
CIRCULATORS
TH116
7651
RS2058
TH781
EX
RAL
EX SPS
4MW
40
kV
4kW
40kW
400kW
20 kV
12kV
10mW
5kV
LEVEL
CONTROL
SOURCE
09th April 2003
R.A. Church RAL
OTHER DRIVE CHAIN
TH116 OUTPUT ASSEMBLY
4MW
FW//REF
WAVE
TH116
1 MW LOAD
MATCHED
1MW
POWER
70db
CAVITY
COUPLER
CIRCULATOR
SPLITTERS
PHASE
SHIFTER
09th April 2003
R.A. CHURCH R.A.L.
ALTERNATIVE TO USING TH116 TUBES
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It would seem that the R.F. circuit at Cern needs considerable re-stressing and
modification before it is suitable for Mice R.F. use. The spare circuit at
R.A.L.is incomplete and parts need re-manufacturing.
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If TH116’s are used they require Power Splitters or Hybrids(which require
loads), a Circulator(which also requires a load) and a Phase Shifter, none of
these items are inexpensive.
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The TH116 is also, at 4MW, close to its power limit.
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9 3/16 line is also very marginal, in all good but good match conditions at
4MW
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09th April 2003
R.A. Church R.A.L.
THE ALTERNATIVE
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An alternative to the 116’s at 4MW is a 1MW plus source for each cavity.
This may seem an expensive solution but there are big savings in the output
circuitry when not used as a split 4MW source.
It would provide proper isolation for each cavity and truly independent phase
and amplitude control at low level. The installation would also be much
simpler.
A suggested line up could be :Cavity - 70db coupler - TH526(13db gain 1 to 1.5MW) - TH571 (15db gain 50
to 80 kW) - Solid State Driver (1.6 - 2.6kW) - 10mW from low level controlss
Tube cost estimates from Thales U.K. Rep :TH526 92k Euros Cavity 145k Euros TH571 27k Euros Cavity 52k Euros
This is an elegant but expensive solution.
A cheaper tube line up Could be :TH116 - RS2058 exSPS and still achieve a similar result.
09th April
R.A. Church R.A.L
2003
INDEPENDENT DRIVE TO EACH CAVITY
CAVITY
1.2MW
2 kW
62 kW
(13 db)
10 mW
(15 db)
70db
COUPLER
TH 526
TH 571
or ex SPS AMP
SOLID STATE
DRIVER
AMPLITUDE
AND PHASE
R.F.
SOURCE
CONTROL
R.F. SOURCE TO SEVEN
OTHER PHASE AND
AMPLITUDE CONTROL
SYSTEMS
09th April 2003
R.A. CHURCH R.A.L.
AVAILABILITY OF EQUIPMENT
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Reflectometers, Phase Shifters, Power Splitters and circulators, quote from Mega.
One TH116 circuit from Cern, other to be built or acquired from other users, enquires being made.
Two TH116 tubes to be bought at £26k each.
Two TH781 circuits and tubes to be purchased at approx. £80k each
I understand ex SPS RS2058 circuits and tubes are available at Cern.
7651 circuits and their solid state drivers are available at RAL
Designs for level control, Vg2 pulsers, Cathode Modulators and phase comparators for tuning etc are
available at RAL.
An amount of 9 inch line is available at Cern I understand but more will be needed I expect.
Power Supplies will in general have to bought but need not be highly sophisticated. Rough price
guide is 40kV £80k, 1 20kV £30k, 12kV £15k.
Other equipment, Heater Transformers, Blowers, Control Systems etc likely to require purchasing.
It must be remembered that it takes time to get delivery of a large
quantity of power tubes etc.
09th April 2003
R.A. CHURCH RAL
PROBLEMS MODULATING THE TH116
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There was a problem cathode modulating several 116’s a year or so ago. The
tubes did not turn off between pulses even though the tubes were biased off in
the cathode circuit. Current flowed (around 2amps) from some other part of
the tube structure (maybe the grid) to the anode. This suggests that some part
of the structure was getting hot enough to emit.
Thales were contacted but could offer no suggestions as to why the problem
had occurred.
Subsequent tubes operated successfully with cathode modulation and no
between pulse current.
Cathode modulation has been used at R.A.L. successfully for a number of
years.
To add anode modulation to each TH116 power supply could add up to £100k
per power supply!!!
R.A. CHURCH R.A.L.
09th April 2003
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COST OF SUGGESTED SYSTEMS
BASED ON QUOTES FOR MAJOR ITEMS
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1. SINGLE DRIVE CHAIN TO DRIVE TWO TH116 TUBES :£1,667,000
2. INDEPENDENT DRIVE CHAINS FOR THE TWO TH116 TUBES :£1,864,000
3. SEPARATE 1.5MW DRIVERS FOR EACH CAVITY COMPLETELY
NEW SYSTEMS :£3,041,000
4. SEPARATE 1.5MW SYSTEMS USING 116 TUBES AND SPS CIRCUITS
:£2,237,000
IF IT WAS POSSIBLE TO USE EX-ISIS 116 TUBES and EX-SPS TUBES
THE COST OF SYSTEM 4 WOULD BE REDUCED TO £1,869,000
(ISIS 116 TUBES ARE USUALY REPLACED WHEN THEY FAIL TO GIVE 2.3MW OUT)
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R.A. CHURCH R.A.L.
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09th April 2003
1MW TEST RIG
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THE TH116 CIRCUIT WHICH IS AVAILIBLE AT CERN WOULD
PROBABLY NEED LITTLE MODIFICATION TO OPERATE AT POWER
LEVELS OF 1-1.5MW. (as in separate drive to each cavity)
DRIVE COULD BE OBTAINED FROM AN EX-SPS AMPLIFIER
LOW LEVEL DRIVE COULD BE OBTAINED FROM AN EX-ISIS
DRIVER.
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A 30kV and 12kV POWER SUPPLY WOULD HAVE TO BE PURCHASED
OR OBTAINED.
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THIS WOULD BE A QUICK WAY TO OBTAIN A HIGH POWER TEST
SOUPCE.
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R.A. CHURCH R.A.L.
09th April
2003
SYSTEM USING SINGLE DRIVE CHAIN TO DRIVE TWO TH116 TUBES
TH116 TUBES
CERN CCT
R.A.L. CCT DRAWINGS
R.A.L CCTS
POWER SPLITTERS
PHASE SHIFTERS
CIRCULATORS
COUPLERS
SOLID STATE DRIVER
40kV PSU
12kV PSU
20kV PSU
CONTROLS
TOTAL
INSTALATION COST
TOTAL
X3
X1
X!
X2
X4
X8
X8
X8
X1
X3
X1
X1
X1
£78,000
£80,000
£12,000
£120,000
£16,000
£300,000
£400,000
£26,000
£20,000
£240,000
£20,000
£25,000
£100,000
£1,437,000
£150,000
£1,587,000
This does not include testing the uprated Cern circuit or the cost of removal of exSPS
Amplifiersand their modificationif required.
09th April 2003
SYSTEM USING TWO TH116 TUBES AT 4MW AND POWER SPLITTING
TH116 TUBES
MODIFIED CERN CCT
R.A.L. CCT
MODIFIED DRAWINGS
TH781 and CCT
CIRCULATOR
PHASE SHIFTERS
40kv P.S.U
20kV P.S.U.
SCREEN P.S.U
CATHODE MODULATORS
12kV P.S.U. (CERN TUBE)
MATCHED TEE
70db REF
CONTROLS
TOTAL
INSTALATION COST
TOTAL COST
X2
X2
X8
X8
X2
X2
X4
X2
X2
X6
X8
X8
£52,000
£80,000
£60,000
£12,000
£160,000
£400,000
£300,000
£160,000
£50,000
£60,000
£20,000
£40,000
£24,000
£26,000
£160,000
£1,604,000
£160,000
£1,764,000
This does not include testing the uprated Cern circuit or the cost and removal of the ex-SPS
Amplifiers and their modification if required.
09th April 2003
SEPARATE 1.5MW DRIVERS FOR EACH CAVITY
TH526 TUBES
COAXIAL CIRCUIT
TH571
COAXIAL CIRCUIT
SOLID STATE DRIVER
30kV P.S.U.
10kV P.S.U.
70db COUPLER
SCREEN P.S.U
CONTROLS
ANCILARIES
FEEDER
TOTAL
INSTALATION COST
TOTAL COST
09th April 2003
X8
X8
X8
X8
X8
X8
X8
X8
X16
X8
X1
X1
£488,000
£768,000
£144,000
£276,000
£160,000
£320,000
£120,000
£80,000
£160,000
£120,000
£120,000
£15,000
£2,771,000
10% £270,000
£3,041,000
SEPARATE 1.5MW DRIVES FOR EACH CAVITY USING TH116 TUBES AND SPS CIRCUITS.
TH116 CIRCUITS
TH116 TUBES
RS2058 TUBES
8 X CERN SPS CCTS
SOLID STATE DRIVER
30kV P.S.U.
10kV P.S.U.
70db COUPLER
SCREEN GRID P.S.U.
CONTROLS
ANCILARIES
FEEDER
TOTAL
INSTALATION COSTS
TOTAL COST
X8
X8
X8
X8
X8
X8
X8
X8
X8
X8
X1
X1
£480,000
£208,000
£160,000 Budget price from Thales who took over the
£50,000
the tube from Siemans
£160,000
£320,000
£120,000
£80,000
£80,000
£200,000
£184,000
£15,000
£2,057,000
£180,000
£2,237,000
It may be possible to reduce the cost of the above option by using ex ISIS and SPS tubes
09th April 2003