Transcript Beam Diagnostics current ‘Snapshot’ of Activities (non

Beam Diagnostics Overview
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Work ‘snapshot’ {this year}
Aims
General Context
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Tour of Machines /Facilities
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appreciation,where we fit
 examples: DSP, WS
Work, People, Priorities
Glimpse of certain Worries
AD
CTF3
ISOLDE
Linacs
PSB
PS & Exp Areas
New Orbit System for PS
A.O.B.
PPC-14 Sept 01
V Chohan
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Beam Diagnostics current
of Activities (non-exhaustive)
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PSB Wire Scanners
Normalizers for Closed Orbit M’ment in PS
Isolde Instrumentation Integration
PS new-CT studies Development with 500 MHz Digitizers
OTR development/Tests
Video Image Digitization / Linux PC/DSC etc (CTF3, OTR..
CTF3 Prelim + Initial phase Developments + for startup 17/9/01
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N.B. - new projects are essential for our staff
{ D067-->AD --> CTF3 & LEIR }
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LHC DC-Beam Current Transformer
AD M-shaped excitation for BTF based ramp tune m’ments
East Hall
LEIR work estimations/ projections /proposals
CLIC study related activities ( R&D)
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PPC-14 Sept 01
LaserWS, x-ray Position Sensitive Detection(Medical world..
V Chohan
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Beam Diagnostics Overall Aims
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Maintain Essential Equipment for Current Operational Use
Aim to React and Respond to URGENT Needs Fast
including for Divisional Projects
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Recent Examples:: ( non-exhaustive)
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Digitization for TOF Video screens images , in TT2 ……
OTR Development + for PS/SPS High Energy Coupling Checks
100K Turns in PS Measurement System for X - X’ Studies
Launch rationalisation Activities in light of given
manpower scenarios and constraints and aiming to go
forward….examples ::
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PS Closed orbit vs trajectory CODD,
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review process launched ~July 2001…..
PPC-14 Sept 01
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Beam Diagnostics - an appreciation
and flavour of important issues:
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WHAT DO DIAGNOSTICS SYSTEMS INVOLVE &
HOW THEY FIT IN THE ENVIRONMENT ?
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In our complex of Accelerators, since late 80’s , systems are NOMORE
pieces of hardware only - software issues and integration to higher
complex levels have become part & parcel of a given measurement
system
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The 1991 ‘model’ of Systems development and commissioning System Specific software, Infrastructure/Architecture , Application Level
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One must appreciate complexity of certain measurement
systems as well as (a) general integration issues , (b) dependency
on non-BD factors,
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Just two Examples
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PPC-14 Sept 01
(c) shutdowns, (d) history ….
DSP Usage & development cycle: AAC, PS, PSB , AD…(LEIR?)
Wire Scanner etc..
V Chohan
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Controls Architecture, where we
fit our Diagnostics Systems &
Who does what…..
PPC-14 Sept 01
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Example of DSP System Development &
Environment - also applies to other complex
systems like PSB WireScanner
ADC 6441
OUTPUT
2
1
DRX 6510
OUTPUT
3
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4
7
+
8
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2
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IN 2
CH
D
EXT
CLK
CH
C
IN 1
OUTPUT
INPUT
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CH
B
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CH
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W 95
POD
JTAG
SIGNAL GENERATOR
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DSP Modules in VME - PS Div
Experience
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1989
THEMIS Board
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1989
1990
1991
DataGeneral VASP with C25
PS Tunes(Baconnier Grp)
CO PS-SL LYNX-OS & UNWORKABILITY with THEMIS
( BD Group Formation - regrouping of staff - ACH, Johnston
etc) AAC M’ment importance diminishes - Collider end &
LEAR too foreseen )
DATAGeneral VASP with C25
PSB Tunes(BD Grp)
DataGeneral goes bankrupt / bust
PS Tunes WORK with VASP Board BUT, decide to abandon
VASP & buy DataBeta DBV96 with Motorola DSPfor PSB Tunes
End-1993 ::{‘Big Bang’ tests with VASP on PSB }
Success with 1 Ring Tests in PSB with DBV96 ( 1 m’ment
every 15ms ) before new RF
All 4 PSB Rings MLPX m’ments every 5 ms with 500V pulser
PENTEK DRX Board
AD Tunes, Intensity, beam sizes(BD Grp)
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1991
1992
1993
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1997
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1999
1999
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PPC-14 Sept 01
under OS9
V Chohan
AAC Perf.check(AR Grp)
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People, Work, Priorities vs. Projects:
{ LEIR for CERN commitment to LHC, CTF3Further Stages , etc }
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Positive point is that for some systems we have new
young people who lack experience but have the capacity
to develop knowledge of OLD SYSTEM & build NEW
systems BUT the INTEGRATION ASPECTS WOULD BE AN
ISSUE OF IMPORTANCE
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EXPERIENCED staff departures in recent years and next:
DWilliams, MLeGras ,JOlsfors, CCarter, OMarqversen,
GMartini, LMerard ,..
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Making the aspects of maintenance & /or
system extension/improvements very difficult
HENCE,often for many systems one can only propose
“extension” or ‘copies’ of existing similar systems & the
associated methodology of access even though the
physical sensors & devices may have substantially new
hardware component in them.
PPC-14 Sept 01
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People, Work, Priorities vs. Projects:
{ LEIR for CERN commitment to LHC, CTF3-
Further Stages , etc }
becomes very Important :
PRIORITY IN TERMS OF NEED & FINANCIAL PROVISION: new
DEVICES - Example : PU’s ( AND CORRECTORS ? ) costs vs
BENEFIT
PRIORITY IN TERMS OF MANPOWER USAGE with clear
understanding that importance of one would delay
another
PPC-14 Sept 01
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Diagnostics Systems - a GLIMPSE on
what next on important issues:
{ opening a Pandora’s Box or A can of worms ? }
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Controls + VME Hardware getting old/ Companies go
bankrupt, disappear, meaning ---->
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Do we have Spares ? If not what do we do ?
New similar hardware(if stay in VME), market study, purchase,
development cycle ( Drivers, installation, tests, shutdowns…..
….At least 2 yrs cycle from date of purchase ) .
 Examples:
» DL515DL7515 [ BT & BTP Pickups, CTF3 Inj etc]
» STR751/755 [ L3 + L3 to PSB trafos, L2/L3 Measur.Line & PS Inj
studies Semgrids MSH , BLVDs ]
» ELTEC video DGTZ
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PCI systems & Integration (Image DGTZ, 500MHz Acqiris )
Standardization or freezing vs. progress
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Example :Tune Measurement systems, Method used and DSP: AD to
LEIR to PS & PSB..?
Change the 1991 Model to Vertical Slice ? How ? manpower
Keeping in-house knowledge & outsource ? Feasibility?
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PPC-14 Sept 01
{ H/W - S/W - Timing & intimate interaction }
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Beam Diagnostics - Some Current
Topics…per machine or facility
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Linac2:
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Consolidation of Measurement lines Systems
continued……..
Linac3:
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Multi-slit Emittance M’ment - Important for non-Pb Species(LHC)
Revival of Massimo Crescenti ‘s program?? ( issues of H/W, S/W,
Applic., very old Frame Grabber, responsibility?…… PRIORITY SETTING
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Faraday Cup Electron Suppression ( ex-E.Tanke’s work? ..
Responsibility ? C.Hill ? - one should be doing good housekeeping
by standardizing with Isolde ‘experience’ if that’s the case , BD takes
on more work !!
Organizational Issue /needs discussion
AD:
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M-shaped beam excitation in BTF technique to measure Tunes on ramps
[ URGENT PRIORITY FOR LEIR IMPLICATIONS]
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new high sensitivity ( E7 pbars) trafo in extr lin , calibr., timing, etc
ISOLDE:
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PPC-14 Sept 01
Needle Wire Scanners, SemGrids, Faraday Cups …. WORK continues
V Chohan
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Beam Diagnostics - Some Current
Topics…per machine or facility
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CTF3: Preliminary phase shutdown work this year & preparations
Priority for 17Sept01 startup { Major renewal / modification/ relocation/
reorganization exercise }
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Pickups UMA
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ECM’s & WCM’s & TRA [ Current Monitors & transformer]
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Timing issues..
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Wire Beam Scanners
Sem-grids
MTV’s
Slits SLH/SLV’s
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Transition Cerenkov monitors (TCMs) and Synch. Radiation light ports (MSRs)
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Optical Lines Mods to Streak Camera from TCM’s MSR’s
Special pickups ( tune M’ment in EPA ).
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Bessel Filters, amplifiers,RT-task, Timing issues…. ( in absence of MLGras ….
CTF3 : ‘Further Phases’ work :
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PPC-14 Sept 01
PU Design, 10 GHz WCM’s ...
Thermal dissipation in OTR Study….
Etc..
V Chohan
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Beam Diagnostics - Some Current
Topics…per machine or facility
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PSB:
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Wire Scanners
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Half-Turn Pickup
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ORGANIZATIONAL ISSUE / Jose Sanchez- Gate Module, r f cage + NIM
cleanup etc.. Comblin, REQUEST coordination..
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Beam Transfer Function M’ment: ORGANIZATIONAL ISSUE
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BTU30 repair and auto gain setting.. Machine Access needed
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PPC-14 Sept 01
Image DGTZ for Inj & Ej screens: Feasible -
V Chohan
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Beam Diagnostics - Some Current
Topics…per machine or facility
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PSB:
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Wire Scanners Details
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Major Project ongoing for these 8 systems and at this stage , too early to
say how far we will get this year. Complex micro-coded Motor Control,
new ADC-VD72/INCAA-2MHz (not ICV122) , prototype electronics board,
RT-task etc.. Delayed on the whole by 1 year. Manpower problem(Olsfors..)
{ history: 1 PS type device was installed for test purposes down to 50MeV with 2 regimes
:extr. Photomultipliers for secondaries above 200 MeV & secondary emmission from wire
for further down to 50 MeV }
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Image DGTZ for Inj & Ej screens Details:
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PPC-14 Sept 01
One milestone is to check one system to work with beam before end of
this year. If tests successful, the prototype extended for all 8 systems
Involves several persons in very significant manner with high priority
Feasible -
simplest, for tests : use OTR test method [ needs iris control as well ]
Definitive: needs, priorities & definitions with ‘NvideoOS’ or we can
continue PCI systems a la carte ( CTF3-Streak C., TT2-OTR, ………………
PRIORITY ISSUE & ORGANIZATIONAL
[ remember : CCD cameras & RADIATION Hardness - OTR uses semi-rad
hard vidicon? ]
V Chohan
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Beam Diagnostics - Some Current
Topics…per machine or facility
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PS:
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Flying Wire in sections (H)54,64 (V)75,85:
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M’ment with TREV or Internal timing both possible , one or
other [ poor operational applic pgm ? ]
influence of beam loss: Can DISTINGUISH secondaries from
photomultipliers separately from wire current
[APPLICATION ISSUE ]
Discrepancy in identical m’ments on same device: ensure
same ‘good’ beam, dp/p, intensity, flattop etc
[check:
KPriestnall + Uli Raich …..
Sem-Fils TT2 ( 40 micron gold plated Tungsten wires) :
( TT2 SemGrids are 3 mm Tungsten strips)
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PPC-14 Sept 01
Is IN/OUT really needed in PPM ? - one can do without because
leaving it in even for high intensity may be OK without affecting
beam blowup?
For Electron Cloud effect, improvements HAVE BEEN made,
particularly with polarisation - but results not too positive ?
Next steps?
V Chohan
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Beam Diagnostics - Some Current
Topics…per machine or facility
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PS:
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Q Measurement:
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WCM03 & WCM95 & TT2 WideBand PU’s 208, 228
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PPC-14 Sept 01
The present system was designed during 20 bunch era and is
based on a half-a sine wave kick and so the phase of the kick
was not too critical. Now, for LHC-era beams say with 4
bunches (which show much more unequal ampltd response)
the kicker phase gets critical (even for Trev synch) & with fine
phase adjustments and so the recommendation is to do
measurements with sufficient intensity and at least 4
equidistant bunches till we get opportunity to replace/renew the
system - rectangular pulse like PSB ?, BTF technique ? What
DSP?..etc
[ PRIORITY & ORGANIZATIONAL ]
LIMITATIONS at High Intensity (nTOF & CNGS) - Attenuators
/power stages get burnt/blown up. BETTER PROTECTION
IMPLEMENTED
In TT2 difficult to understand ( Radiation? ) what happens
because extreme tests (upto 80V) in lab showed no adverse
effect .. BETTER PROTECTION IMPLEMENTED
USAGE conflicts on PS WCM’s : r.f. PLL controls vs
observation Use
[ ORGANISATIONAL ISSUE ]
V Chohan
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Beam Diagnostics - Some Current
Topics…per machine or facility
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PS:
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Mean Radial Position evaluation from CODD System:
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NORMAL CODD m’ments are rejected when this option is chosen - it is
one or the other - MRP m’ments done with interval of 5 ms
CODD - Several operational points
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harmonic no sequencing: now done directly from Beam Control
Timing [ Modifications in Software in CODS done recently ]
Vertical Scaling in Display [ Applic Program - ORGANISATIONAL ISSUE]
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Gate, phase ,Base-line-Restitution Adjustments
- procedure/ method : JBelleman on WEB
OR,
- EM (CODS) property /modification approach : feasible but needs S/W effort
[PRIORITY vs NORMALISER Closed Orbit ]
 Double-batch Injection Usage : Procedure Available but complex , ELSE
MODIFY S/W: [ PRIORITY vs NORMALISER Closed Orbit ]
 h=21 high energy measurements:
 Measurements WORK - however at the limit because PLL VCO limits
; Originally was h=20 , now extended - { very large dynamic range h=1
to h=20 }
PPC-14 Sept 01
V Chohan
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