choice of architecture : 1 photo-injector 3 lil sections: 1 for compression and 2 for acceleration

CTF3-CLEX meeting June 12, 2006 page 1

choice of architecture :• 1 photo-injector• 3 LIL sections: 1 for compression and 2 for

acceleration• 1 beamline with diagnostics (leading to 2-beam

teststand)

Probe beam status and scheduleJanuary 2006

15 MV/mcompression

17 MV/macceleration

17 MV/macceleration

LIL sections

beam dump

focusing coils

K

quadrupoles

Laser RF pulse compression

2 x 45 MW

10 20 25 25

profile monitor

position monitor

steerer

rf gun cavity spect. magnetRF deflector

C A L I F E S


RF gun status

R. RouxJuly, 7th 2006

1. Drawings, overview

2. What is under way?

3. Open questions, ask for info

4. Problems, risks


1. Studies finished

2. Drawings finished

3. List of components:

- gun with a measurement loop

- 2 tapered waveguides

- 2 LIL flanges

- 2 solenoids

- 1 steerer

- vacuum chamber (tubes, valve, bellow)

- 2 gauges

- 1 ionic pump

- 1 pneumatic valve

- 1 translation trolley for the preparation

chamber (additional request from CERN)

- NEG coating on the vacuum chamber

(agreed with CERN people)

1. Overview

solenoids

RF input

steerer valve

photocathode

vacuum pump


2. What’s under way?

• Gun: new supplier, the coupler cell should arrive between 17th-21th July

if everything OK, order the rest of the gun, all pieces in September

then, RF measurements, mechanical adjustments and brazing at LAL

(thanks to Eric Chevallay for the 316LN stainless steel, we will soon refunded)

• Magnetism: coils and steerer are ordered, should arrive in the beginning of September

power supplies will be bought by CERN (offer of R. Losito)

• Vacuum: gauges and valve are received, ionic pump at the end of July

power supply will be bought by CERN (offer of R. Losito)

• Mechanics: vacuum chamber and supports are under construction in LAL workshop

it should be finished in September but risks of overlap with PHIN gun

machining PHIN gun has the priority !


3. Open questions, ask for info

• Girder: if we can reuse the LIL 2300 mm girder, we need the drawings open question: RF gun assembly on girder at LAL or at CERN ?

• Cabling: Who does the cabling between the photo-injector and the racks?-cables for solenoids and steerer (electric and cooling)-cable for RF loop-cables for gauges and power supply-on which side of the linac set the connectors of the solenoids?

• Possible overlap between the solenoid connectors and RF network pumps? (happened on PHIN, solenoids sent back to the supplier to modify connectors)

• Cooling: tuning cooling loop from frozen water (20°C) the gun will be mechanically deformed in such a way thatthe right tuning frequency achieved at 30°C


3. Problems, risks

- New supplier for the gun, if not good delay

- Money: 70 k€ received this year

not enough to order the power supplies and gun cooling loop

I hope to get the totality of the required budget next year in March

But up to now,RF gun construction proceeds well


Signal taken from the Drive Beam Laser

2 main distinct tasks:1. extraction & manipulation of laser beam (windowing, x4

frequency multiplication, doubling of the pulse frequency 1.5 3 GHz)

2. transport of the laser beam over 80 m as far as the photo-cathode

Subcontractor : LILM (Laser Matter Interaction Lab) from CEA-Saclay

Study of the 2 tasks till the end of 2006

mechanical design and realization follow-up by Dapnia

Pb : delay of the DB laser 1st tests with real laser will be very late

Laser system


Time-schedule


Beam dynamics

calculations nearly complete ...

single bunch is fine

multibunch operationdue to beam-loading, bunch charge should be linearly reduced to meet energy & phase requirements (1% and 1deg)Qb < 5nC/N

still to be done:

• effect of laser spot misalignment

• estimation of the emittance measurement accuracy


Time-schedule


Califes Drawings

Drawings nearly complete ...


injector(LAL Orsay)

Injection beamline

laser beam

laser table

LIL sectioninput

BPM

screen

vacuumpump


inter-section

BPM

steerer


diagnostics beamline

screen

RF deflector QL3 Triplet Dipole Dumpvac. pump

total length (cathode plane to output valve) = 21.316 m


RF system

klystron, RF pulse compression, RF network : supplied by CERN

Modulator : includes• a high voltage pulsed power supply with negative polarity• three electromagnet power supplies• a filament heater power supply• an ion pump power supply• a hydraulic network• a X-ray shielding• a control-command system• some racks containing the materiel

offers from vendors received on 1st of July

realization time 12-14 months

vendor choice at end of July


RF network

Phase adjustment by length of waveguides

BOC Cavity (Pulse compression gain = 2,1)

Suppose 25 m waveguide, 8 flanges pairs

P

RF gun cavity

4.5 dB Splitter

3 dB Splitter4.5 dB

Splitter

15 MV/mCompression

17 MV/mAcceleration

43 MW

27,08 MW

9,4 MW 24.65 MW17.1 MW

A

W

W

17 MV/mAcceleration

SF6

= 90°

Klystron TH 2132

= 0 ° = 0 °

CO CO CO CO

P PP

P

P

P

P

CO+L CO+LCO+L

24.65 MW

CO

W

SF6

86,4 MW

76,3 MW

49,2 MW

22 MW

21.55 MW24.1 MW15 MW

7 MW

26,5 MW

CO

c

C0.5° precision0.5° stability± 20 ° tuning

Phase adjustment by length of waveguides

BOC Cavity (Pulse compression gain = 2,1)

Suppose 25 m waveguide, 8 flanges pairs

P

RF gun cavity

4.5 dB Splitter

3 dB Splitter4.5 dB

Splitter

15 MV/mCompression

17 MV/mAcceleration

43 MW

27,08 MW

9,4 MW 24.65 MW17.1 MW

A

W

W

17 MV/mAcceleration

SF6

= 90°

Klystron TH 2132

= 0 ° = 0 °

CO CO CO CO

P PP

P

P

P

P

CO+L CO+LCO+L

24.65 MW

CO

W

SF6

86,4 MW

76,3 MW

49,2 MW

22 MW

21.55 MW24.1 MW15 MW

7 MW

26,5 MW

CO

c

C0.5° precision0.5° stability± 20 ° tuning

defined in March 2006

1 power phase-shifter

has to be developed(fine tuning of thecompression section)


Phase-shifter

3 GHz scaling from a SLAC model at 11.4 GHz by Alexej Grudiev

sliding circular guide + mode converter

tolerances and mechanical studymade at Saclay

fabrication will start end of september

power tests at CERN


Time-schedule


Vacuum adaptation and laser miror

Compression LIL section

Accelerating LIL section

Accelerating LIL section

Diagnostic lineRF Gun

Sector 1 Sector 2 Sector 3

IZ 120 IZ 120 IZ 120 IZ 120 IZ 120 IZ 120IZ 270 IZ 270

Vacuum

Vacuum system defined2 LIL sections tested under vacuum at Cern

• 3 valves

• 6 ion pumps for LIL sections

• 2 ion pumps for input and output beamlines

• power supplies, gauges

hardware providedby CERN

primarypumping group


steerer H+V solenoids earth field correction

quadrupoles dipole

5 2 x 17 3 x 2 3 1

order before August

CERN provision

CERN provision

call for tender (5) before August

CERN provision

delivery Nov 2006

- - delivery May 2007

-

Magnets

QL3 BHZ36


compression accélération accélération

RF gun

H V H V

solénoïde

VH VH H HV V

steerer steerer steerer steerer steerer

dipole

quadrupoles

solénoïde

quadrupoles quadrupoles

steerer

# of power supplies

type Intensity (A) Voltage (V)

Steerers 12 Bipolar ± 10 ± 5

Solenoids 2 Unipolar 120 20

Quadrupoles 3 Unipolar 200 10

Dipole 1Unipolar with

degauss capability100 20

Earth field compensation

2 Unipolar 5 3

Power supplies requirements

Specifications of Power supplies have been done and conveyed to CERN


Time-schedule


Measure Requirements chosen solutions

Current Resolution ≤ 1% Precision ≤ 3% Bandwidth > 250 MHz

Single shot, non destructive

BPM (after calibration)

Position Resolution ≤ 20µmPrecision ±100µmBandwidth >50 MHz

Range ±10 mmSingle shot, non destructive

BPMScreen + CCD camera

Profile Resolution ≤ 20µm Range 10x10mm Screen + CCD camera

Emittance Error < 20% Quad scan + Screen + CCD camera

Central energy

Resolution DP/P ≤1 %Precision ≤ 2% Bandwidth >250 MHz

Single shot 15° bending magnet + BPM

Energy spread

Resolution DP/P≤0.5%

Time resolution is desirable

15° bending magnet + Screen + CCD camera; possible future ...Streak Camera, segmented photomultiplier, segmented beam dump … for time resolution

BunchlengthResolution ≤0.5ps rms

Variation of bunch length along the train

Deflecting cavity + Screen + CCD camera; possible future ...RF pick-up (30-174 GHz) during operations

Diagnostics


CF40 rotating connectorand flange to be welded

Al2O3PTFE

SMAreceptacle

CF40 rotating connectorand flange to be welded

Al2O3PTFE

SMAreceptacle

BPMSpecifications : single bunch & multi-bunch operation (1-64 @ 3 GHz) 0.5 nC• coaxial reentrant cavity, original design from R. Bossard (CERN)• proposed and developed for TTF (M. Luong, C. Simon - DAPNIA)

prototype for technology validation : OK

pre-serie (2 units) : under fabrication


Beam profile monitors

3 profiler systems to different locations:injector output, behind the triplet, behind the dipole

2 main sub-systems:

1. the vacuum tank with devices (screen, actuator, viewport, lighting)

2. the optics system (lenses, CCD camera, filter wheel, shielding…)

Screen holder

Insertion mecanism

Tank study has started ...


TTF2 CTF3 SOLEIL

optics design (various magnifications) + CCD camera (with Cern MTV interface)

examples of optics design with different levels of integration

Califes : will start next September

Optics system


Time-schedule


Beam

GraphiteLead

Polyéthylène500

Beam Dump

Derived from SOLEIL(100 MeV, 0.5 to 8 nC, 3 Hz)

Adaptation for CALIFES in progress (200 MeV, 1.5 A, 21 ns, 5 Hz)


41.6 m

22 m

CLEX building

CALIFES should fit into CLEX building ...

the last dipole could include 3 branches:

• straight to 2-beam teststand

• 15° to Beam Dump

• 30° to Instrumentation Test Beam


Time-schedule


Can we have a closed area for Califes ?

Which girders can we re-use from CERN ?

Who does the cabling between the Califes components and the racks ?

Alignment: studied by Michel Fontaine from Dapnia

who is the CERN contact person ?

Questions List


Flow (l/mn) Power (kW) Units Flow PowerStabilised water (30°)LIL sections 10 0.5 3 30 1.5deflecting section 1 0 0rf gun 1 0 0waveguides 1 0 0

Demineralised water (18-22°) 0 0sections solenoids 120 60 2 240 120quadrupoles 2 2 3 6 6dipole M45 7 8 1 7 8klystron collector & body 50 5 2 100 10klystron foc 20 5 2 40 10modulator 20 10 2 40 20rf gun solenoids 5 2 2 10 4

Total 473 179.5

Cooling needs

choice of architecture : 1 photo-injector 3 lil sections: 1 for compression and 2 for acceleration

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