LINAC 4 TL diagnostics

LINAC 4 TL diagnostics

L4 BCC – 1 Sep 2011

F. Roncarolo, U. Raich

L.Soby, J.Tan, C.Zamantzas, F. Lenardon, C.Vuitton, G-J.Focker

L4 BCC - 01 Sep 2011 2

General Remarks / OverviewDESIGN

Completed for almost all instruments (most of TL devices == L4 monitors) Basically all devices will be tested at 3 MeV test stand Open issues

– Number of devices and locations: need frozen layout• Once done: details about interconnections

– Profile monitor in dump line (see later slide)– BLM detector type (see later slide)– Equipment of TL with station for laser stripping R&D

SCHEDULE / BUDGET Present advancement/plans/budget for design, fabrication, cabling and installation

under control BI Linac 4 review (with reviewers panel) on October 18th (tbc and announced in the

next few days)


L4 BCC - 01 Sep 2011 3

Diagnostics Park


MONITOR TYPE Quantity

L4T LINE

BCT 7

BLM 6

SEM GRIDS 3 (H+V)

BPM 12

BSM 1

L4Z LINE

WS or SEM GRID 1 (H+V)

BCT 1

3 BTVs now replaced by 1 WS or SEM GRID (H+V)

From Layout DB 31-08-11

L4 BCC - 01 Sep 2011 4

Beam Current Transformers BCT


Copy of LEBT monitors– 100 mm diameter– Up to 200 MHz sampling rate

Acquisition sync. with the distributor, to know how much beam current goes to each PSB ring

– Electronics ready for such option– Need FPGA code update (likely not possible before LS1)

In general– Do we agree on the number of devices?– Foreseen by BI : 6, Layout DB: 7

L4 BCC - 01 Sep 2011 5

Beam Position Monitors (BPM) Shorted strip-line detectors

– Same design for all L4 BPMs– Diameter for TL monitors: 100 mm, L = ~250mm– Electronics with down-mixing of 22 MHz maximum sampling rate 4x22=88 MHz– 50 ns pulse length beam position measurement foreseen by the design (noise

levels to be investigated)

For TL: is # of monitors and location frozen ? At the moment of installing TL BPMs: will it be possible to change the 17 old TL

monitors (after BHZ20)?


J. Tan

L4 BCC - 01 Sep 2011 6

Profile Monitors (SEM Grids) Same design as all L4 monitors – will require reduced pulse length (100us) Mechanics ~ on schedule, 140 mm flange-to-flange (PIMs type) New electronics under development, to be tested on 3 MeV test stand

– 200 kHz ADC band (5 us)– Wire polarization– New connectors and cables: 32 channels in 1 cable


Is this up to date? Once frozen: verify details of flange connections

L4 BCC - 01 Sep 2011 7

Dump Line profile monitor 3 screens option abandoned

Additional monitor not included in BI plans– What are requirements?– SEM Grid or WS ?

Spare L4 SEM grid– single shot meas– 24 wires fixed pitch

Spare L4 WS– multishot meas– 40 um resolution (wire diam.)

SEM grid on stepping motor– Not foreseen by BI (can recuperate test bench device?)– Not single shot but can improve resolution with less shots than WS

new SEM with variable resolution (by variable rotation w.r.t. beam axis)– not foreseen design new or try to recuperate L2 type device– When rotation != 90 deg: during single shot the sampling is done at different longitudinal

locations


L4 BCC - 01 Sep 2011 8

Beam Loss Monitors (BLM)


W.Vigano, C. Zamantzas

Auto-gain switching

Auto-gain switching

-Integrated detector signal sampled every 2 us-From pA to mA detector output current

2 us : sampling the integral

Electronics under development, in parallel to L4 linac and PSB new electronics

Special screened cables to minimize EM noise (problem in other world-wide linacs)

TL cable installation on stand-by while waiting for latest beam optics and BLM location s

Every second BLM location is equipped with a spare cable to host an additional monitor if needed

Choice of detector (Ionization chamber, chamber type, or possibly other detectors) under discussion

Wide dynamic range expected !

L4 BCC - 01 Sep 2011 9

Laser Stripping R&D Aim at profile + emittance measurement For testing @ Linac 4

– At least 1 station– Y chamber @ dipole– Establish laser location and optical line

path If there will be no intermediate dump

between 1st bend and BI line: – can test only laser stripping and profile

meas (no emitt. meas) with a station after PIMS


LASER stripping

LASER stripping

H0 monitor

H0 monitor

H0 monitor

Possible locations

L4 BCC - 01 Sep 2011 10

SOFTWARE BCT – BPM

– Low level completed or well on the way to completion– Need OP GUI development– All will be tested at 3 MeV test stand

SEM grids– Low level and OP GUI done, being used at test stand

BLM– Definition of the memory map

• CPU in readout simulation mode • Start development of driver, RT software, etc.

– First version of memory map (LINAC4) - end of September


L4 BCC - 01 Sep 2011 11

SPARE


L4 BCC - 01 Sep 2011 12F. Roncarolo, U. Raich

L4 BCC - 01 Sep 2011 13F. Roncarolo, U. Raich

LINAC 4 TL diagnostics

Documents

Transcript of LINAC 4 TL diagnostics