Two Beam Test Stand

Roger Ruber

for the Uppsala/CLIC Group

CTF3 Collaboration Meeting

CERN, 17 January 2006

2CTF3 Collaboration Meeting - Two Beam Test StandRoger Ruber17-Jan-2007

Two Beam Test Stand

chicane for measurement

breakdown current

Walter’s talk

3CTF3 Collaboration Meeting - Two Beam Test StandRoger Ruber17-Jan-2007

Breakdown Current Measurement

• probe beam ~180 MeV e-

• breakdown current ~1 MeV e-

Proposal to add small chicane upstream:• 1 extra dipole (standard CTF3 corrector)• vacuum chamber with

– moveable Faraday cup• current measurement• momentum measurement through angular resolution

– silicon detector strip• accurate position resolution <100 μm• can be commercial or LHC type (t.b.d.)

Downstream option will be kept open …

4CTF3 Collaboration Meeting - Two Beam Test StandRoger Ruber17-Jan-2007

Beam Lines• quadrupole triplets

– 12 ordered from Scanditronix– delivery expected end May

• dipole correctors– 8+1 CTF3 (MHVC) type

(maybe Scanditronix)

• shielded ports/bellows/valves– for upstream drive beam,

similar as TL2 & CR

• beam dump– 2 dipole magnets (MDX type) – graphite or segmented dump

(t.b.d.)

5CTF3 Collaboration Meeting - Two Beam Test StandRoger Ruber17-Jan-2007

Beam Transport

CALIFESquads & dipole

MAD-X calculationsβ-functions• optimize to 1m at test table• FDF triplets for smaller βx

• focus at dump for optimized momentum resolution

• 2 dipoles upstream for aiming at table

• 2 dipoles downstream,maybe 1 enough?

Dispersion function• shows effect dipole before

beam dump• extend dump line (now 0.6m)

to increase momentum resolution?

dump dipole

6CTF3 Collaboration Meeting - Two Beam Test StandRoger Ruber17-Jan-2007

Vacuumvalves decouple theexperimental table

ion pumps 40 l/s• 1 upstream• 2 downstreamP <10-7 mbarlower with improvedout-gassing → P x 0.1beam pipe• probe beam = stainless• drive beam = aluminium

failure pump near table→ P x 10

7CTF3 Collaboration Meeting - Two Beam Test StandRoger Ruber17-Jan-2007

Beam Instrumentation• position measurement

– 2x5 inductive BPMs, CTF3 type• all components have been ordered• IPU electronics being assembled

– expected errors σBPM ≈ 10 μmwith 5 BPMs per beam line

• position: 0.95σ• angle: 0.61σ/m

• energy measurement– with spectrometer dipole before

the beam dump• BPM• OTR screens

– design being prepared (CEA)– segmented beam dump optional

• breakdown current measurement– by BPMs or chicane

8CTF3 Collaboration Meeting - Two Beam Test StandRoger Ruber17-Jan-2007

ComponentsPower supplies• 2 for spectrometer dipoles• 8x2 +1 for corrector dipoles

– 2 ch/dipole, except extra dipole for chicane

• 12 for quadrupoles• will be ordered soon through AB/PO

(Roger Genand)

Vacuum components• valves, pumps, gauges, bellows, flanges• upstream in the drive beam all shielded• will be ordered when detailed design ready through

AT/VAC (Jan Hansen)

9CTF3 Collaboration Meeting - Two Beam Test StandRoger Ruber17-Jan-2007

Work to be prepared from now on

Beam lines• design drawings

including positioning of all components• design vacuum chambers and ports• supports for equipment and tables

Breakdown Current Chicane• design associated vacuum chamber• design and test detectors

– Uppsala facility up to 300 keV e-

10CTF3 Collaboration Meeting - Two Beam Test StandRoger Ruber17-Jan-2007

Conclusions

Basic layout known, a lot of work remains:• detailed design for installation• order & assembly components• chicane + detectors for breakdown studies

In December we shall have a nice TBTS!

• supported by the Swedish Science Counciland the Wallenberg Foundation