W. Kozanecki MCC AP meeting, 8 Mar 07

MD goalsMD goals

Experimental procedureExperimental procedure

HER-only x & y scans + high-current extrapolationHER-only x & y scans + high-current extrapolation

[LER only X & y scans + high-current extrapolation][LER only X & y scans + high-current extrapolation]

Angles, then & nowAngles, then & now

Summary Summary

MD report: IP aperture scansMD report: IP aperture scans

P. Grenier, W. Kozanecki & M. Weaver

+ S. Ecklund's watchful eyes!

Preliminary!

Preliminary!

W. Kozanecki MCC AP meeting, 8 Mar 07

Quantify Babar Quantify Babar background sensitivitybackground sensitivity to IP x & y angles for to IP x & y angles for single beams (HER & LER separately, moderate currents)

collisions (moderate currents, then high currents)

and determine the and determine the optimum anglesoptimum angles (from the background (from the background viewpoint)viewpoint)

Cross-calibrateCross-calibrate LIPP & HIPP BPMs

Babar luminous & boost angles

against against support-tubesupport-tube (ST) BPMs (ST) BPMs

Determine LER IP Determine LER IP angles angles center of luminosity monitor center of luminosity monitor absolute angles (from ST BPMs) at moderate current

reference angles (from HIPP & LIPP), corrected for high-current operation

MD goalsMD goals

W. Kozanecki MCC AP meeting, 8 Mar 07

(Intended)(Intended) Measurement SequenceMeasurement Sequence

SetupSetup colliding beams, offset by-2 patterns at 300 mA ea.

Single-beam scans: Babar onSingle-beam scans: Babar on HER

XP scan, then YP scan @ 300 mA, offset pattern

with XP & YP at optimum, raise IH as high as it will go, to measure current-dependence of support-tube (ST) - L/HIPP correlation

LER XP scan, then YP scan @ 300 mA, offset pattern

with XP & YP at optimum, raise IL until ST BPMs saturated

Luminosity-monitor scans: Babar onLuminosity-monitor scans: Babar on YP(e+) scan attempted; failed bec. IP Multiknob fbk not functional

Current-dependence of ST-L/HIPP correlation in collisionCurrent-dependence of ST-L/HIPP correlation in collision most likely different from single-beam (heat from both beams)

Background scans @ high current: XP(eBackground scans @ high current: XP(e--), YP(e), YP(e++), XP(e), XP(e++), YP(e), YP(e--)) beam-beam tails behave diffferently from beam-gas

W. Kozanecki MCC AP meeting, 8 Mar 07

Experimental procedureExperimental procedure

Operating procedure: generalOperating procedure: general manual scans, CRR plots vs time (autoscan impractical: knobs not

closed!)

monitor angles with ST BPMs, LIPP/HIPP orbit fits & monitoring fbks

monitor temps & vacuum throughout the scans

trickle, Babar on (incl. DAQ, with background-enriched trigger)

Initial setup: colliding beams, offset patterns, trickle, Babar onInitial setup: colliding beams, offset patterns, trickle, Babar on bunch patterns

LER: by-2, 300 mA, buckets 400-3400. BPM measdef @ bucket 3200

HER: by-2, 300 mA, buckets 0-3000. BPM measdef @ bucket 200

private BPM calibrations for PR02 BPMS 7052 to 8012, 3024 to 2203

set initial IP angles based in May 2005 lumi-monitor settings (exc. XP-) LER XP = 9.25 mrad (ST BPMS) YP = - 1.1 mrad (ST

BPMs)

HER XP = -16.7 mrad (ST BPMS) YP = + 1.1 mrad (ST BPMs)

optimize luminosity on tunes

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only scans: current- & angle historyHER-only scans: current- & angle history

HER current XP_ST (e-)

YP_ST (e-)YP_ST (e-) during XP scan

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only scans: ST vs HIPP BPMs @ 300 mAHER-only scans: ST vs HIPP BPMs @ 300 mA

XP (orbFit) vs. XP_ST

XP (HIPP) vs. XP_ST

YP (orbFit) vs. XP_ST

YP (HIPP) vs. XP_ST

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only XP scan (1a)HER-only XP scan (1a)

Normalized to HER-only prediction

BW dmd, normalized

TR-23 (EMC)

E-collim (PR12 9082)

IDRC normalized

x 1.9

x 2.6x 1.7

x 2.3

Normalized to HER-only prediction

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only XP scan (1b)HER-only XP scan (1b)

PR02 VP7032

PR02 VP8020

PR02 VP8029

CsI 3054

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only XP scan (2a)HER-only XP scan (2a)

neutron fwd_1DCH normalized

SVT occpcy, = 0 (E)

SVT occpcy, = 180 (W)

x 2.7

x 2.5

x 3.6

x 11

Normalized to HER-only prediction

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only XP scan (2b)HER-only XP scan (2b)

These pressure ratios are different from the associated background ratios!

PR02 VP7034

PR02 VP7042

PR02 VP8027

PR02 VGH_8027

W. Kozanecki MCC AP meeting, 8 Mar 07

Locations of the neutron monitorsLocations of the neutron monitors

Neutron_bckw_1

Neutron_forw_1

Neutron_forw_2

CsI 7

J. Va'vra

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only YP scan (1a)HER-only YP scan (1a)

DCH normalized

SVT occpcy, = 0 (E)

SVT occpcy, = 180 (W)

Normalized to HER-only prediction

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only YP scan (1b)HER-only YP scan (1b)

neutron bwd_1CSi7052

Xcoll PR12 7102 Ycoll PR12 8072

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only YP scan (1c)HER-only YP scan (1c)

PR02 VP8027

PR02 VP8020

PR02 VGH_8027

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only YP scan (2)HER-only YP scan (2)

neutron fwd_1

DIRC normalized

TR-23 (EMC)

BW dmd, normalized

Normalized to HER-only prediction

Normalized to HER-only prediction

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only YP scan (3)HER-only YP scan (3)

neutron fwd_2 CSi3054

PR02 VP8024

W. Kozanecki MCC AP meeting, 8 Mar 07

High-current extrapolation: HER-onlyHigh-current extrapolation: HER-only

HER current XP_ST (e-)

YP_ST (e-)

W. Kozanecki MCC AP meeting, 8 Mar 07

High-current extrapolation (HER-only): ST vs HIPPHigh-current extrapolation (HER-only): ST vs HIPP

XP (HIPP) vs. XP_ST (e+) YP (HIPP) vs. YP_ST (e+)

XP (HIPP)

W. Kozanecki MCC AP meeting, 8 Mar 07

High-current extrapolation (HER-only) (1a)High-current extrapolation (HER-only) (1a)

DIRC normalized

TR-23 (EMC)

BW dmd, normalized

E-collim (PR12 9082)

Dynamic pressure

Dynamic pressure

W. Kozanecki MCC AP meeting, 8 Mar 07

High-current extrapolation (HER-only): pressure samplingHigh-current extrapolation (HER-only): pressure sampling

Thermal outgassing

W. Kozanecki MCC AP meeting, 8 Mar 07

High-current extrapolation (HER-only) (2)High-current extrapolation (HER-only) (2)

DCH normalized

SVT occpcy, = 0 (E)

SVT occpcy, = 180 (W)

Dynamic pressure

W. Kozanecki MCC AP meeting, 8 Mar 07

High-current extrapolation (LER-only): angles vs. IHigh-current extrapolation (LER-only): angles vs. I

XP_ST (e+)

YP_ST (e+)

LER current

W. Kozanecki MCC AP meeting, 8 Mar 07

High-current extrapolation (LER-only): ST vs. LIPPHigh-current extrapolation (LER-only): ST vs. LIPP

XP_ST (e+)

YP_ST (e+)

XP (YIPP) YP (LIPP)

W. Kozanecki MCC AP meeting, 8 Mar 07

HER angles, HER angles, Aug 06Aug 06 & & nownow (HIPP) (HIPP)

Data:

HER single-beam scans, 300 mA, 7 Mar 07

W. Kozanecki MCC AP meeting, 8 Mar 07

LER angles, LER angles, Aug 06Aug 06 & & nownow (LIPP) (LIPP)

Data:

LER single-beam scans, 300 mA, 7 Mar 07

Note high ratios!

W. Kozanecki MCC AP meeting, 8 Mar 07

To do…To do…

Complete LER-only analysisComplete LER-only analysis

More sophisticated subdetector analysesMore sophisticated subdetector analyses

Analyse temperaturesAnalyse temperatures

Analyse vacuum signaturesAnalyse vacuum signatures

Volunteers needed!Volunteers needed!

W. Kozanecki MCC AP meeting, 8 Mar 07

Summary (preliminary!)Summary (preliminary!)

Background sensitivity to single-beam aperture scans @ 300 mABackground sensitivity to single-beam aperture scans @ 300 mA significant, may explain part of the discrepancy w/ Jan '04 norm'lztn;

is different, in both magnitude & optimum, for different subdetectors. The overall background optimum is incompatible with the SR load, at least in the HER (LER tba)

Subdetectors assemble in 'families' that depend on X/Y, HER/LER; within one scan, several sources are at work, depending on the direction of SR fans & local aperture restrictions.

Consistency between ST BPM's & LIPP/HIPPConsistency between ST BPM's & LIPP/HIPP much improved since run 5

degrades as current increases, esp. for LER XP

Luminosity monitor scanLuminosity monitor scan could not be completed for lack of working IPO Multiknob feedback.

Can the fast dither play the same role? We need to know the center!

may yield LER IP angles different from the single-beam optimum.

No reason to believe that this single-beam optimum will coincide No reason to believe that this single-beam optimum will coincide with that for beam-beam tails: with that for beam-beam tails: need to explore XP & YP need to explore XP & YP optimization on both L and backgrounds under physics optimization on both L and backgrounds under physics conditions!conditions!

W. Kozanecki MCC AP meeting, 8 Mar 07

SPARESSPARES

W. Kozanecki MCC AP meeting, 8 Mar 07

HER-only YP scan (4)HER-only YP scan (4)

E-collim (PR12 9082)

W. Kozanecki MCC AP meeting, 8 Mar 07

AppendixAppendix: CRR plot files & data sets: CRR plot files & data sets

PEP-II e-log: 5 March 2007 day + swing shiftPEP-II e-log: 5 March 2007 day + swing shift See also

http://www.slac.stanford.edu/BFROOT/www/Detector/Backgrounds/ApertureScan-05Mar07.html

for scan times & ranges

CRR button filesCRR button files BBR_BKG_LERIPORB.btn

BBR_BKG_HERIPORB.btn

BBR_ALL_BKG.btn

All data in PHYSICS_DATA:[pep2.char.05mar07]All data in PHYSICS_DATA:[pep2.char.05mar07]