Probe beam status and schedule

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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 schedule

15 MV/m

compression

17 MV/m

acceleration

17 MV/m

acceleration

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. magnet

RF deflector

C A L I F E S


CTF3
-
CLEX meeting June 12, 2006

page

2

RF gun status

R. Roux


July, 7
th

2006

1.
Drawings, overview

2.
What is under way?

3.
Open questions, ask for info

4.
Problems, risks


CTF3
-
CLEX meeting June 12, 2006

page

3

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


CTF3
-
CLEX meeting June 12, 2006

page

4

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 !


CTF3
-
CLEX meeting June 12, 2006

page

5

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 that


the right tuning frequency achieved at


30
°
C


CTF3
-
CLEX meeting June 12, 2006

page

6

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


CTF3
-
CLEX meeting June 12, 2006

page

7

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


CTF3
-
CLEX meeting June 12, 2006

page

8

Time
-
schedule


CTF3
-
CLEX meeting June 12, 2006

page

9

Beam dynamics

calculations nearly complete ...

single bunch

is fine

multibunch

operation

due 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


CTF3
-
CLEX meeting June 12, 2006

page

10

Time
-
schedule


CTF3
-
CLEX meeting June 12, 2006

page

11

Califes Drawings

Drawings nearly complete ...


CTF3
-
CLEX meeting June 12, 2006

page

12

injector

(LAL Orsay)

Injection beamline

laser beam

laser table

LIL section

input

BPM

screen

vacuum

pump


CTF3
-
CLEX meeting June 12, 2006

page

13

inter
-
section

BPM

steerer


CTF3
-
CLEX meeting June 12, 2006

page

14

diagnostics beamline

screen

RF deflector

QL3 Triplet

Dipole

Dump

vac. pump

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


CTF3
-
CLEX meeting June 12, 2006

page

15

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


CTF3
-
CLEX meeting June 12, 2006

page

16

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
Splitter
4.5 dB
Splitter
15 MV/m
Compression
17 MV/m
Acceleration
43 MW
27,08 MW
9,4 MW
24.65 MW
17.1 MW
A

W
W
17 MV/m
Acceleration
SF6

= 90
°
Klystron TH 2132

= 0
°

= 0
°
CO
CO
CO
CO
P
P
P
P
P
P
P
CO+L
CO+L
CO+L
24.65 MW
CO
W
SF6
86,4 MW
76,3 MW
49,2 MW
22 MW
21.55 MW
24.1 MW
15 MW
7 MW
26,5 MW
CO

c
C
0.5
°
precision
0.5
°
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
Splitter
4.5 dB
Splitter
15 MV/m
Compression
17 MV/m
Acceleration
43 MW
27,08 MW
9,4 MW
24.65 MW
17.1 MW
A

W
W
17 MV/m
Acceleration
SF6

= 90
°
Klystron TH 2132

= 0
°

= 0
°
CO
CO
CO
CO
P
P
P
P
P
P
P
CO+L
CO+L
CO+L
24.65 MW
CO
W
SF6
86,4 MW
76,3 MW
49,2 MW
22 MW
21.55 MW
24.1 MW
15 MW
7 MW
26,5 MW
CO

c
C
0.5
°
precision
0.5
°
stability
±
20
°
tuning
defined in March 2006

1 power phase
-
shifter

has to be developed

(fine tuning of the

compression section)


CTF3
-
CLEX meeting June 12, 2006

page

17

Phase
-
shifter

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

sliding circular guide + mode converter

tolerances and mechanical study

made at Saclay

fabrication will start end of september

power tests at CERN


CTF3
-
CLEX meeting June 12, 2006

page

18

Time
-
schedule


CTF3
-
CLEX meeting June 12, 2006

page

19


Vacuum adaptation
and laser miror

Compression
LIL section

Accelerating
LIL section

Accelerating
LIL section

Diagnostic line

RF Gun

Sector 1

Sector 2

Sector 3

IZ 120

IZ 120

IZ 120

IZ 120

IZ 120

IZ 120

IZ 270

IZ 270

Vacuum

Vacuum system defined

2 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 provided

by CERN

primary

pumping group


CTF3
-
CLEX meeting June 12, 2006

page

20

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


CTF3
-
CLEX meeting June 12, 2006

page

21

compression
accélération
accélération
RF gun
H
V
H
V
solénoïde
V
H
V
H
H
H
V
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

1

Unipolar with
degauss capability

100

20


Earth field


compensation

2

Unipolar

5

3

Power supplies requirements

Specifications of Power supplies have been done and conveyed to CERN


CTF3
-
CLEX meeting June 12, 2006

page

22

Time
-
schedule


CTF3
-
CLEX meeting June 12, 2006

page

23

Measure

Requirements

chosen solutions

Current


Resolution ≤ 1%
Precision ≤ 3%

Bandwidth > 250 MHz

Single shot, non
destructive

BPM (after calibration)

Position

Resolution ≤ 20µm

Precision
±
100µm

Bandwidth >50 MHz

Range
±
10 mm

Single shot, non
destructive

BPM

Screen + 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

Bunchlength

Resolution


≤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


CTF3
-
CLEX meeting June 12, 2006

page

24

CF40 rotating connector
and flange to be welded
Al
2
O
3
PTFE
SMA
receptacle
CF40 rotating connector
and flange to be welded
Al
2
O
3
PTFE
SMA
receptacle
BPM

Specifications : 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


CTF3
-
CLEX meeting June 12, 2006

page

25

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 ...


CTF3
-
CLEX meeting June 12, 2006

page

26

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


CTF3
-
CLEX meeting June 12, 2006

page

27

Time
-
schedule


CTF3
-
CLEX meeting June 12, 2006

page

28

Beam

Graphite

Lead

Polyéthylène

500

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)


CTF3
-
CLEX meeting June 12, 2006

page

29

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


CTF3
-
CLEX meeting June 12, 2006

page

30

Time
-
schedule


CTF3
-
CLEX meeting June 12, 2006

page

31

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


CTF3
-
CLEX meeting June 12, 2006

page

32

Flow (l/mn)
Power (kW)
Units
Flow
Power
Stabilised water (30°)
LIL sections
10
0.5
3
30
1.5
deflecting section
1
0
0
rf gun
1
0
0
waveguides
1
0
0
Demineralised water (18-22°)
0
0
sections solenoids
120
60
2
240
120
quadrupoles
2
2
3
6
6
dipole M45
7
8
1
7
8
klystron collector & body
50
5
2
100
10
klystron foc
20
5
2
40
10
modulator
20
10
2
40
20
rf gun solenoids
5
2
2
10
4
Total
473
179.5
Cooling needs