RC Report: April 23

Log entry time 22:13:40 on April 23, 2004

Entry number 83057

keyword=RC Report: April 23

Run Coordinator's Report for 22 April Owl to 23 April Swing

Summary

After recovery from yestesterday's Magnet quench, We have had a quiet night and day of LH2 production data.
MCC needed an injector access to replace autistic trim cards.
Beam is more stable following yesterdays investigations by MCC.
Energy Measurement done.
Remainder of run outlined in morning RC meeting. See below.

Significant News

Beam Stability: Yesterday we gave beam to MCC to investigate the cause of high trip rate. Reza performed an
injector optimization but this did not cure the problem, but helped to isolate the trouble to 3 RF cavities which were
unstable. These cavities were bypassed and rest of machine gradients adjusted to compensate. Trip rate is way down.

Lost a signal to Oct 7, Det 8 FL. We will send in a replacement team if/when beam gone for significant time.

A great increase in halo (10-20kHz) was traced to energy instabilities in the accelerator. After phoning MCC, they "tweaked" the
energy a bit and halo rate dropped back down to about 3kHz.

Short term Plans

Saturday: LH2 Production Running.
Moller/IHWP insertion/Moller On Sunday.
Take a 120Hz run once per day, preferably on day shift.
Gas Shed He bottle will need replacing soon.
LH2 Production running.

Long Term Plans... Tentative Schedule... G0is4evR.

To help answer lingering questions, the discussions settled out with

10uA, LH2 Running: Need 48 "beam" hours (24 data/tape hours) .

Aluminum Frame data: Need 48 beam hours (24 data/tape hours) .

Target Boiling study: Need 4 hours.

Transverse Polarization running.
    For this we have a slight extension in the run: This moves our 'end date' to Thursday, May 13. In exchange we will give
    Rolf a shift or two of Detector tests involving the pivot target and an SOS move.
    Also required will be to establish the desired launch angle, a moller run (or two), and probably a mini spin dance.

Tentative Schedule of this is below.

Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
19	20	21	22	23 Day LH2 LH2 Production Run Swing LH2 Production Run	24 Owl LH2 Production Run Day LH2 Production Run Swing LH2 Production Run	25 Owl LH2 Production Run Day LH2 Production Run Moller + 1/2 wave plate Swing LH2 Production Run
26 Owl LH2 Production Run Day LH2 Production Run 0900 Beam studies 1200 We need 48 beam hours of 10uA, LH2 Back-ground data. 10 uA, LH2 Swing 10 uA, LH2	27 Owl 10 uA, LH2 Day 10 uA, LH2 0900 Beam studies 1200 10 uA, LH2 Swing 10 uA, LH2	28 Owl 10 uA, LH2 Day 10 uA, LH2 0900 Beam studies 1200 ?? Moller + 1/2 wave Plate 10 uA, LH2 Swing 10 uA, LH2	29 Owl LH2 Production Run Day ?? Moller + 1/2 wave Plate LH2 Production Run Swing LH2 Production Run	30 Owl LH2 Production Run Day LH2 Production Run Swing LH2 Production Run	1 Owl LH2 Production Run Day We need 48 hours Al Frame data. Al Frame Data Swing Al Frame Data	2 Owl Al Frame Data Day Al Frame Data Swing Al Frame Data
3 Owl Al Frame Data Day Al Frame Data Target Boiling studies (4 hours) Swing LH2 Production Run	4 owl LH2 Production Run Day LH2 Production Run Swing LH2 Production Run	5 Owl LH2 Production Run Day LH2 Production Run Swing LH2 Production Run	6 Owl LH2 Production Run Day LH2 Production Run Swing LH2 Production Run	7 Owl LH2 Production Run Day LH2 Production Run Swing LH2 Production Run	8 Owl LH2 Production Run Day LH2 Production Run Swing LH2 Production Run	9 Owl LH2 Production Run Day LH2 Production Run Swing LH2 Production Run
10 Owl LH2 Production Run Day Setup for transverse polarization Moller Transverse running Swing Transverse running	11 Owl Transverse running Day Transverse running Transverse running Swing Transverse running	12 Owl Transverse running Day Transverse running Transverse running Swing Transverse running	13 Owl Transverse running Day Tran severs running The End	14	15	16

A copy of this log entry has been emailed to: beck@jlab.org

User name Rutledge