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Work. In January 2007, we installed 5 chambers in a straight Field Free region of PEP-II Low Energy Ring (LER) . Closest bend at ~18 meters upstream : 1 stainless steel chamber that allows to measure the Secondary Electron Yield SEY of material exposed to the beam environment

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Work
Work

  • In January 2007, we installed 5 chambers in a straight Field Free region of PEP-II Low Energy Ring (LER). Closest bend at ~18 meters upstream:

    • 1 stainless steel chamber that allows to measure the Secondary Electron Yield SEY of material exposed to the beam environment

    • 4 TiN/Al chambers of which 2 with Rectangular Grooves and 2 with plain flat surface

  • Recently in July, we corrected for a misalignment of the chambers (that was leading to previous misleading results..)

  • Next, some recent results from the groove chamber tests

M. Pivi, SLAC - Sep, 2007


Groove chambers tests
Groove chambers tests

M. Pivi, SLAC - Sep, 2007


Design groove extrusions slac
Design - Groove Extrusions - SLAC

FAN EVENTUALLY HITS “BOTTOM” OF SLOT FOR FULL SR STRIKE

LIGHT PASSES THRU SLOTS BETW FINS

BECAUSE FAN IS “THICKER” THAN FIN

FIN TIPS= I.D. OF CHAM

FAN HITS HERE FIRST

VIEW IS ROTATED 90 CCW FROM ACTUAL FAN ORIENTATION

Goal: build Rectangular Groove chambers by Al extrusion, TiN coat and install in Straight Section PEP-II LER for tests

p.4

M. Pivi, SLAC - Sep, 2007


Work

Installation in PEP-II LER: Groove chambers

PEP-II LER straight section

e+ 

Connecting Flange

Flat chamber

Groove chamber

Electron detectors

Arc bend B1 magnet upstream

M. Pivi, SLAC - Sep, 2007


After alignment compare e current signals
After alignment: compare e- current signals

M. Pivi, SLAC - Aug, 2007

electron signal in Groove TiN-chambers « Flat TiN-chambers and Stainless steel chamber.

M. Pivi, SLAC - Sep, 2007


Work

Summary on Groove tests

  • Rectangular Groove chambers in STRAIGHT sections.

    • Correct a misalignment of the chambers. July 11, 07.

    • Successfully measured electron signal in Groove chambers much lower than Flat (no-groove) chamber and Stainless Steel chamber

    • Simulations campaign ongoing to estimate chambers SEY

  • Rectangular groove chambers are a possible electron cloud mitigation technique for ILC DR STRAIGHT sections.

  • Simulations show that the electron cloud is an issue for magnetic field regions of the ILC Damping Ring: wigglers, dipoles, quadrupoles.

  • The characterization of mitigation techniques in MAGNETS is ongoing at various laboratories: CERN, KEK, Cornell and SLAC.

M. Pivi, SLAC - Sep, 2007


Work

Thanks!

To contributors and collaborators:

R. Kirby, L. Wang, F. Le Pimpec, T. Raubenheimer, J. Seeman,U. Wienands, M. Sullivan,

K. Ohmi,S. Kato, K. Oide, Y. Suetsugu,

D. Arnett, G. Collet, R. Kirby, N. Kurita, T. Markiewicz, B. Mckee, M. Morrison, G. Stupakov, N. Phinney, A. Kulikov, F-J Decker (SLAC), M. Palmer, D. Rubin, D. Rice, L. Schachter, J. Codner, E. Tanke, J. Crittenden (Cornell), J. Gao (HIPEP), A. Markovic et al. (Rostock Univ.), M. Zisman, S. De Santis, C. Celata, M. Furman, J.L. Vay, S. De Santis (LBNL), S. Kato, K. Oide, K. Ohmi, Y. Suetsugu (KEK), F. Willeke, R. Wanzenberg (DESY), J.M. Laurent, A. Rossi, E. Benedetto, F. Zimmermann, G. Rumolo, J.M. Jimenez, J-P. Delahaye (CERN), A. Wolski (Cockroft Uniiv.), B. Macek (LANL), C. Vaccarezza, S. Guiducci, R. Cimino, P. Raimondi (Frascati), O. Malyshev et many other colleagues…

August 6, 2007

M. Pivi, SLAC - Sep, 2007