Linac 4 Instrumentation Needs K.Hanke & M.Pasini

K.Hanke / Linac 4 instrumentation review / May 9, 2007

Linac 4 Instrumentation NeedsK.Hanke & M.Pasini


Overview of Instrumentation Needs

DTL CCDTL SCL

40MeV 90MeV 160MeV

Drift Tube Linac• 352 MHz• 13.4 m• 3 tanks• 5 klystrons• 4 MW• 82 PMQuad

Side Coupled Linac• 704 MHz• 28 m• 20 tanks• 4 klystrons• 12 MW• 20 EMQuads

Cell-Coupled Drift TubeLinac• 352 MHz• 25.3 m• 24 tanks• 8 klystrons• 6.5 MW• 24 EMQuads

RFQ

chopper 352 MHz3.6 m11 em quad3 rf cavity

H-

3MeV95keV

rf volume source(DESY)• 35 kV extrac.• 60kV postacc.

CHOPPER

RFQ (IPHI)• 352 MHz• 6 m• 1 Klystron• 1 MW

3MeV front-end

Linac 4 TDR CERN-AB-2006-084 ABP/RF


Commissioning and Operation

commissioning phase:

• moveable bench for different stages of the DTL Faraday Cup, SEM grid, transverse and lonitudinal emittance diagnostics, 2 pick-ups (tof) - for DTL tank-by-tank commissioning - SNS experience with “D-Plate”

• IPHI diagnostic line for the 3 MeV front-end wire scanners, spectrometer, pick-ups, transformers, time-of-flight → see presentation P.Ausset


Source & LEBT

diagnostics box(Faraday cup, SEM)

- emittance scanner- spectrometer- fixed Faraday cup- transformer


Source & LEBT

instrument position energy [MeV] intensity[mA]

resolution

retractable Faraday cup

betweensolenoids

0.095 80 0.1 mA

fixed Faraday cup

before RFQ 0.095 80 0.1 mA

SEM grid betweensolenoids

0.095 80 2 mm

SEM grid after spectrometer

0.095 80 1 mm

transformer 0.095 80 1 mAemittance movable 0.095 80 1 mrad


Chopper Line

2 slow wire scanners

2 transformers

BSHM


Chopper Line


resolution

slow wirescanners

upstream anddownstream of chopper

3.0 80 0.1 mm

transformer between first two and last two quads

3.0 80 0.5 mA

beam shape and halo monitor

end of chopper line

3.0 80 1 ns1 mm


BSHM: Requirements

2.84 ns 1st objective:measure residual H- in (not completely) chopped buncheswith a sensitivity of ~ 1000 ions, in the vicinity of full bunches (~108 ions). detector must be turned on/off within 1 ns, dynamic range 1:106

2nd objective:transverse imaging, halo diagnosticsbeam core: ~108 H-/bunch/cm2

beam halo: ~103 H-/bunch/cm2

active area of detector 4 × 4 cmdynamic range: 1:106

~108 ions~103 ions


3 MeV test place in the PS South Hall including source, LEBT, RFQ, chopper line and IPHI diagnostic line

IPHI diagnosticline

3 MeV Test Place


DTL

DTL tank1 DTL tank2 DTL tank3

BLMBLM

BLM

SEM grid

beam loss monitor

beam current transformer

position, intensity and phase pick-up


DTL


resolution

pick-up(phase, position, intensity)

after every tank

10/20/40 40 0.1 deg0.1 mm0.5 mA

SEM grid after tank 3 40 40 0.5 mm

transformer after tank 3 40 40 0.5 mA


CCDTL

CCDTL module1 CCDTL module2


BLM

BLM

BLM

SEM grid

beam loss monitor




CCDTL



BLM

BLM

BLM

SEM grid

beam loss monitor




CCDTL


resolution


after every module

45.9/52.2/58.6/65/71.5/78.1/84.6/91.1

40 0.1 deg0.1 mm0.5 mA

SEM grid after modules 4 and 8

65/91.1 40 0.5 mm

transformer after module 8 91.1 40 0.5 mA


SCL

BLM

SEM grid

beam loss monitor

ceam current transformer


SCL module1 SCL module2

SCL module3 SCL module4

BLM

BLM


SCL


resolution


after every moduleplus 1/module

106.7/124.7/148.8/164

40 0.1 deg0.1 mm0.5 mA

SEM grid after modules 2 and 4

124.7/164 40 0.5 mm

transformer after module 4 164 40 0.5 mA


Transfer Line and PSB Injection

transfer line: • pick-ups, BLMs, profile monitors as in the linactransfer line design pending• emittance diagnostics at the exit of the linac andbefore PSB injection

Booster injection period:profile/position measurement to adjust the beamon the stripper foils

Documents

Linac 4 Instrumentation Needs K.Hanke & M.Pasini