Run Plan Document E04-007: Threshold Pion Production

Tuesday Night Shift Plan Set Left HRS For Elastics (969.3 MeV, 35.5 degrees) –Take Elastic Run and Check T3 vs T7 Rates –Insert Sieve –Cycle Q2 & Q3 to 1400A –Take Sieve Run (at least 250k events) Turn On BigBite dE/E Planes (MWDC should be off) With BigBite Still At 390A Use Carbon –Calibrate dE/E HV (punch-through around 350MeV/c) –Find Threshold Settings Well Above Min. Ionizing Look for Coincs Between BigBite (E23) and HRS With Hydrogen Try To See 700 MeV/c Protons –This should be the lower limit of thresholds

Tuesday Night Shift Plan Turn On BigBite dE/E Planes (MWDC should be off) With BigBite Still At 390A Use Carbon –Calibrate dE/E HV (punch-through around 350MeV/c) –Find Threshold Settings Well Above Min. Ionizing Look for Coincs Between BigBite (E23) and HRS With Hydrogen Try To See 700 MeV/c Protons –This should be the lower limit of thresholds

BigBite Helium Bag Rework Make Sure Detector Package Does Not Move Mark Current Magnet Position Move Magnet Back Approx. 12 inches –watch for collision between magnet and chamber 1 Remove Present Balloon Drill and Tap Two Holes For 1/4” Swaglock Side Of Flangle –Approx. 1” From Top and 1” From Bottom At Sieve Depth Install Gas Connections Check Bottom Sieve Seal For Foreign Objects –Look For Toothpick Like Item At Back Add Vacuum Grease To Bottom Seal Richard Covers Flangle Hole With Balloon Piece Flow Gas (Bottom In and Top Out) Install New Balloon In BigBite Move BigBite Back To Original Position Inflate New Balloon (do not flow to it, will check size tomorrow)

Thursday Night Shift Plan Check Beam When It Return Find Tracks In BigBite with 1400V Chamber & 5V Threshold –T3 with simple cuts will put a proton AFTER Elastic Track Found –Do Chamber HV and Threshold Scan AFTER HV and Threshold Setting Found –Put In HRS Sieve, 390A –Elastic Hydrogen Data Sieve In (keep low current) at least 250k T3 –Keep HRS Sieve In, 0A –Repeat Elastic Hydrogen Data (same current) at least 250k events T3 –Remove HRS Sieve –Elastic Hydrogen Data at least 1M events T3 –BigBite To 360A –Repeat Hydrogen Data at least 1M events T3 –Reduce Current By 50% And Take Another 1M events

Thursday Night Shift Plan Goto Deuterium Target without changing settings –(I.e. keep BigBite at 390A, HRS 35.5 degrees, and MeV) –Take 1M T5 & T6 –Double dE High Threshold, keeping low threshold fixed –Take Another 1M events Goto Carbon and Take HRS Pointing Run T3, at least 100k events Goto First pi0 Kinematics 20.5 Degrees HRS, 960 MeV/c, BigBite at 390A –Take Carbon Single Foil Run (mostly T3) for HRS pointing –Take 1M T5&T6 Events –Turn Off S1 paddles 1,2,5,6 and Check T7 Rate = T3 Rate –Take data T5&T6 event with only S1 paddles 3&4 on until morning. During MorningPass Change Will Install BigBite Sieve and Take Optics Data PLEASE CHECK ALL RUNS! PLEASE COMPLETE SHIFT CHECK LIST

Thursday Night Shift Plan Goto Deuterium Target without changing settings –(I.e. keep BigBite at 390A, HRS 35.5 degrees, and MeV) –Take 1M T5 & T6 –Double dE High Threshold, keeping low threshold fixed –Take Another 1M events Goto Carbon and Take HRS Pointing Run T3, at least 100k events Goto First pi0 Kinematics 20.5 Degrees HRS, 960 MeV/c, BigBite at 390A –Take Carbon Single Foil Run (mostly T3) for HRS pointing –Take 1M T5&T6 Events –Turn Off S1 paddles 1,2,5,6 and Check T7 Rate = T3 Rate –Take data T5&T6 event with only S1 paddles 3&4 on until morning. During MorningPass Change Will Install BigBite Sieve and Take Optics Data PLEASE CHECK ALL RUNS! PLEASE COMPLETE SHIFT CHECK LIST

Kinematics A (I) Beam Energy Check –Left HRS 20.5 Degrees and 1194 MeV/c CYCLE Q2 and Q3 to 1400A –5uA Beam –Goto Ta Target –Take All T3 & T4 Events –Take 100k Events –Goto C Target –Take All T3 & T4 Events –Take 100k Events

Kinematics A (II) Elastic Hydrogen Single Arm Cross Section Check –Left HRS 20.5 Degrees and MeV/c –5 uA, No Raster –Take All T3 & T4 –Take 250k Events

Kinematics (III) Production pi0 Kinematics –Left HRS 20.5 degrees, HRS momentum = 960 MeV/c –BigBite = 390A, Angle = 54 degrees –Set Prescales As Follows T1 take 10 Hz T2 take 10 Hz T3 take 10 Hz T4 take 10 Hz T5 set prescale =1 T6 set prescale = 1 T7 set prescale = T8 set prescale = 100 Take 1M Event Runs All Night With 5uA, No Raster

Beam Parameters Beam Size Between 100 – 200 um

Shift Plan

Kinematics B (part I) Beam Energy Check –Left HRS 16.5 Degrees and 1194 MeV/c CYCLE Q2 and Q3 to 1400A –5uA Beam –Goto Ta Target –Take All T3 & T4 Events –Take 100k Events –Goto C Target –Take All T3 & T4 Events –Take 450k Events

Kinematics B (part II) Elastic Hydrogen Single Arm Cross Section Check –Left 16.5 Degrees and MeV/c –5 uA, No Raster (lower current if needed) –Take All T3 & T4 –Take 450k Events

Kinematics B (part III) Production pi0 Kinematics –Left HRS 16.5 degrees, HRS momentum = 986 MeV/c –BigBite = 390A, Angle = 54 degrees –Set Prescales As Follows T1 take 10 Hz T2 take 10 Hz T3 take 10 Hz T4 take 10 Hz T5 set prescale =1 T6 set prescale = 1 T7 set prescale = T8 set prescale = 100 Take 1M Event Runs All Night With 5uA, No Raster

Kinematics C (part I) Beam Energy Check –Left HRS 14.5 Degrees and 1194 MeV/c CYCLE Q2 and Q3 to 1400A –5uA Beam –Goto Ta Target –Take Up To 1kHz T3 & 1kHz T4 Events –Take 500k Events –Goto C Target –Take Up To 1kHz T3 & 1kHz T4 Events –Take 500k Events

Kinematics C (part II) Elastic Hydrogen Single Arm Cross Section Check –Left 14.5 Degrees and 1147 MeV/c –5 uA, No Raster –Take All T3 & T4 (Up to 1kHz T3 & 1kHz T4) –Take 500k Events To Check For Boiling –Repeat 4 uA Again 500k Events –Repeat 3 uA Again 500k Events –Repeat 2 uA Again 500k Events

Kinematics C (part III) Production pi0 Kinematics –Left HRS 14.5 degrees, HRS momentum = 997 MeV/c –BigBite = 390A, Angle = 54 degrees –Set Prescales As Follows T1 take 10 Hz T2 take 10 Hz T3 take 10 Hz T4 take 10 Hz T5 set prescale =1 T6 set prescale = 1 T7 take 10 Hz T8 set prescale = 100 Take 1M Event Runs With 5uA, No Raster

Kinematics D (part I) Beam Energy Check –Left HRS 12.5 Degrees and 1194 MeV/c CYCLE Q2 and Q3 to 1400A –3uA Beam –Goto Ta Target –Take Up To 1kHz T3 & 1kHz T4 Events –Take 500k Events –Goto C Target –Take Up To 1kHz T3 & 1kHz T4 Events –Take 500k Events

Kinematics D (part II) Elastic Hydrogen Single Arm Cross Section Check –Left 12.5 Degrees and 1158 MeV/c –3 uA, No Raster –Take All T3 & T4 (Up to 1kHz T3 & 1kHz T4) –Take 500k Events

Kinematics D (part III) Production pi0 Kinematics –Left HRS angle = 12.5°, momentum = 1007 MeV/c –BigBite = 390A, Angle = 54 degrees –Set Prescales As Follows T1 take 10 Hz T2 take 10 Hz T3 take 10 Hz T4 take 10 Hz T5 set prescale =1 T6 set prescale = 1 T7 take 10 Hz T8 set prescale = 100 Take 1M Event Runs With 3uA, No Raster