1. IP Beam Instrumentation R&D and Testbeams for the ILC
Mike Woods, SLAC
ECFA ILC Study at Durham, Sept. 2, 2004
IPBI and (very) Forward Detector R&D
Luminosity and Luminosity Spectrum
Energy and Energy Spread
Polarization
Electron ID for 2-photon veto
(described in Section 3.1 of the
Report on Worldwide Linear Collider Test Beam Effort)
ECFA ILC Study, Sept. 2004

2. Beam Instrumentation R&D in Europe
EUROTeV
Work Package 5: Beam Diagnostics
includes laserwire, nano-BPMs, luminosity, energy, polarization
Work Package 2: Beam Delivery System
includes IP Beam Stabilization Feedback, crab cavities
UK LC-ABD (Lincar Collider – Accelerator Beam Delivery)
Includes many of the Beam Diagnostic and BDS components of the
EUROTeV Work Package items
(very) Forward Region Instrumentation Collaboration and Workshops:
(5th workshop
was just held at DESY-Zeuthen last week; plenary talk on this
later today)
These programs lead to a need for development of prototypes and access to
testbeam facilities. Some of this is already underway.
(ex. FONT IP Beam Stabilization beam tests have already taken place at
SLAC’s NLCTA and the ATF at KEK; future tests at TTF are desirable.)
ECFA ILC Study, Sept. 2004

3. Beam Instrumentation R&D in Asia
at KEK ATF in Japan
Laser Wire (beam spotsize and emittance, energy spread)
Rf cavity BPM (nanoBPM collaboration)
IP Beam stabilization with FONT/FEATHER
ECFA ILC Study, Sept. 2004

4. Beam Parameters at KEK ATF, SLAC ESA and ILC
Repetition Rate
1.56 Hz (6.25 Hz max)
10 Hz
5 Hz
Energy
1.3 GeV
28.5 GeV
250 GeV
e- Polarization -
85%
>80%
Train Length
60 ns
up to 400 ns
1 ms
Microbunch spacing
2.8 ns ns
337 ns
Bunches per train 20 2
2820
Bunch Charge
1.0 x 1010
2.0 x 1010
Energy Spread
0.1%
0.15%
ECFA ILC Study, Sept. 2004

5. Beam Instrumentation Tests for the Linear Collider
using the SLAC A-Line and End Station A
Y. Kolomensky
University of California, Berkeley
J. Hauptman, O. Atramentov
Iowa State University
E. Gulmez,† E. Norbeck, Y. Onel, A. Penzo*
University of Iowa
D. J. Miller
University College London
R. Arnold, S. Hertzbach, S. Rock
University of Massachussets
M. Hildreth
University of Notre Dame
E. Torrence
University of Oregon
J. Clendenin, F.-J. Decker, R. Erickson, J. Frisch, L. Keller,
T. Markiewicz, T. Maruyama, K. Moffeit, M. Ross, J. Turner, M. Woods
SLAC
W. Oliver
Tufts University
G. Bonvicini, D. Cinabro
Wayne State University
SLAC-LOI
27 physicists
10 institutions
†also Bogazici University, Istanbul, Turkey
*also INFN Trieste, Italy
ECFA ILC Study, Sept. 2004

6. First IPBI Beam Tests Proposed to SLAC
Energy BPMs (T-474 submitted)
U. of Notre Dame, UC Berkeley, UC London, U. of Cambridge, SLAC
- Mechanical and electrical stability at 100-nm level
- BPM triplet at z = 0, 2.5 and 5.0 meter spacing. BPMs 1 and 3 define
straight line. Monitor BPM2 offset over time scales of minutes, hours
- 2 adjacent BPMs to test electrical stability, separate from mechanical
Synchrotron stripe diagnostics (T-475 submitted)
U. of Oregon, SLAC
- test chicane scheme with wiggler magnet
- characterize detector (quartz fiber / other) performance and capabilities
Pair detectors (T-476 submitted)
Molecular Biology Consortium, U. of Hawaii, Tohoku U., Brunel U., CERN
- use “spray” beam of ~ 4-GeV electrons to mimic pair background
- test speed (at nano-second level) of both 3-d and planar Si
- characterize detector response to “pair background”;
can vary spray beam energy and absorber thickness in front of detector plane
- use MonteCarlo to superimpose 250 GeV electron to determine electron id
efficiency
ECFA ILC Study, Sept. 2004

7. Overview of Proposed Layout for T-474, T-475, T-476
Future
T-476
T-474
T-475
ECFA ILC Study, Sept. 2004

8. Other IPBI Beam Tests Possible in ESA
1. IP BPMs (necessary for fast inter-train and intra-train feedbacks)
- Sensitivity to backgrounds, rf pickup
- Mimic LC geometry, including fast signal processing (but no feedback)
- Sample drive signal to kickers
2. Tests with short bunches (~ mm possible)
- EMI for beam instrumentation or Detector electronics
- collimator wakefield tests
3. Single Particles (electrons, photons, pions)
GeV particles with 1 or less particles/bunch at 10Hz
for LC Detector test beams
4. Fixed target to mimic beamsstrahlung and disrupted beam
- for synchrotron stripe energy spectrometer
- for IP BPM tests
IR Mockup
- Mimick beamline geometry at IP within +-5 meters in z and
ECFA ILC Study, Sept. 2004

9. Outlook
IP Beam Instrumentation is a critical aspect of the Machine-Detector
Interface. IPBI should be considered as one of the Detector subsystems –
measurements of luminosity, energy, polarization (and electron ID at small
polar angles for 2-photon veto) are critical for the ILC physics program.
IPBI R&D Efforts are well underway in all 3 regions. There is an identified
and growing need to develop prototypes, which need access to test beam
facilities.
At SLAC, a Letter-of-Intent for LC Beam Instrumentation Tests in ESA
was submitted to SLAC in Fall 2003 and presented to the SLAC EPAC.
Response from the EPAC and the SLAC Director was very positive.
First 3 Test Beam Requests have been submitted to SLAC and cost
estimates have been made. Requesting a run in June Currently
waiting for SLAC response as we go thru evaluation of SLAC’s efforts for
ILC (I expect a positive response).
ECFA ILC Study, Sept. 2004