HERA Beam Dynamics Meeting / Minutes : 05.08.2004

Attending :
D.Barber, M.Bieler, M.Hoffmann, B.Holzer, J.Keil, E.Kot, M.Minty, E.Negodin, U.Schneekloth, M.Vogt, F.Willeke.

1. Schedule for next machine studies

   Shift/Day	THU, 12.08.	FRI, 13.08.	SAT, 14.08.	SUN, 15.08.
   Morning	1: Alternative e-Tunes for Lumi WiO=M.M. / Kümm=M.M.	3: p-Lonitudinal Multibunch Instabilities (ramp) WiO=R.W. / Kümm=M.H.&E.K.	5: Test p-Operation with Fields in e- Configuration WiO=R.W. / Kümm=B.H.	3: p-Lonitudinal Multibunch Instabilities (ramp) WiO=R.W. / Kümm=M.H.&E.K.
   Afternoon	2: Coherent BeamBeam Excitation (vs. p-phase-advances W/O) WiO=M.B. / Kümm=M.V.	4: e-arc-BBA tests WiO=M.M. / Kümm=J.K.	5: Test p-Operation with Fields in e- Configuration WiO=M.M. / Kümm=B.H.	3: p-Lonitudinal Multibunch Instabilities (ramp) WiO=M.M. / Kümm=M.H.&E.K.
   Night	3: p-Lonitudinal Multibunch Instabilities (ramp) WiO=E.K. / Kümm=M.H.&E.K.	3: p-Lonitudinal Multibunch Instabilities (ramp) WiO=M.B. / Kümm=M.H.&E.K.	5: Test p-Operation with Fields in e- Configuration WiO=M.B. / Kümm=B.H.	RESEVE WiO=J.K.

2. ad 1: Alternative e-Tunes for Lumi
   • Reduce SumVoltage → run above Qx+3Qs
   • Run at mirir tunes (Qx ⇆ Qy)
   • Possibly completely new tunes ?????
3. ad 2: Coherent BeamBeam Excitation (vs. p-phase-advances W/O)
   
   • p: fill 2 * 6 * 10 bunches (or even 3 * 6 * 10)
   • mini-orm (p) to find phase advances over W- and O-halfring
   • for each experiment : e: fill #1 + 3-6 to collide with only one proton train-of-10
   • [QP40 O, QP40 W] to tweak Δμ_x and [QP42 O, QP42 W] to tweak Δμ_y or better :
     orthogonalize → [QP40 O, QP40 W, QP42 O, QP42 W]_x & [QP42 O, QP42 W, QP40 O, QP40 W]_y
   • use transv.-e-MB-FB monitors (switch bunch# !!!) to monitor coherent oscillation
   • use p-wire scanner to measure emittance blow up
   • collide
     • at both experiments simulataneously
     • 1-st at H1 ; 2-nd at ZEUS
     • with different settings of p-Δ&mu bumps
4. ad 3: content removed in response to authors demand (vogtm: 04.11.2009)
5. ad 4: e-arc-BBA tests
   • software is ready to test
   • hardware should be opertational
6. ad 5: Test p-Operation with Fields in e^- Configuration
   • e-magnets not yet shifted ⇒ change currents to mimick effect
   • shift p-orbit@IPs to values needed for e-operation
   • Magnet I_max's have been checkd : OK
   • theoretical Optics and Gemoetry : OK
   • TODO : CHANGE ``Polwender'' of GI-magnets

Return to: HERA BeamDynamicsMeeting homepage, HERA homepage, DESY homepage , MPY homepage , Machine Status .