RHIC 250 GeV Polarized Proton Run 2009 Mei Bai RUN website: 12/16/2008RHIC Spin Collaboration Meeting

Goal of 250 GeV pp /16/2008RHIC Spin Collaboration Meeting Establish polarized proton collisions at beam energy of 250 GeV – Preserve polarization – Explore the luminosity aspects (2 collisions). And evaluate the beam-beam limit at 250 GeV – Further reduce beta* at 250 GeV if time allows Provide physics store at beam energy of 250 GeV including calibrating CNI polarimeter with H jet polarimeter Commission – New low level RF – RF 9MHz cavity – spin flipper in Blue ring

RHIC Schedule: 1 Dec. 15 – 19: RHIC shift leader training Dec. 17 – Jan. 9: – Cryo decontamination – Cryo plant cool down Jan. 12 – 16: Dry run – Plan available on Spin2009 website Jan 10 – Feb.1: 45 k cool down Jan 19: AGS pp starts Feb. 2 – Feb. 5: – Blue 45k to 4.5K – Blue power supply preparation High potting Corrector checkup Snake/DX magnet training Feb. 5 – Feb. 8: – Yellow ring cool down to 4.5 k – Yellow ring power supply preparation Feb. 7(8): Blue ring ready for injection 12/16/2008RHIC Spin Collaboration Meeting

RHIC Schedule: 2 Feb. 8 – Feb. 10: Blue injection setup – Establish blue circulating beam – RF capture with new LLRF – Instrumentation setip Feb 11 – Feb 14: – Yellow injection setup – repeat injection setup with 9 MHz cavity Feb. 15– Feb. 21: – Ramp development with rotator off Feb. 21 – Feb. 23: – Store setup Feb. 23 – Feb. 27: – Rotator ramp development – Store setup Physics on For details, please go to the startup plan on 12/16/2008RHIC Spin Collaboration Meeting

RHIC pp 250 GeV Machine setup (1) Injection: beta* 7.5 m at all IPs Store: beta* 0.7 m at IP6 and IP8, 7.5 m at all other IPs Continuous beta squeeze from injection to store energy at 250 GeV. This also allows a semi constant aperture at IP6 and IP8 during the ramp Working point: – Ramp: 28.69, – Store: , non-linear chromaticity correction through the ramp. 12/16/2008RHIC Spin Collaboration Meeting

RHIC pp 250 GeV Machine setup (2) Tune/decoupling feedback – Critical for precise tune control for ramp development as well as polarization studies – BBQ hardware system has been documented and exercised – Plan to exercise the system during RHIC dry run Control of local orbit around snake – Quadrupoles around snakes were re-aligned during shut-down – Broken bpms at snakes are fixed – A lot of improvements for the overall bpm system – See Vadim’s talk for more details 12/16/2008RHIC Spin Collaboration Meeting

RHIC pp 250 GeV Machine setup (3) RHIC RF system – New LLRF system commissioning All the hardware including all the ADC boards received and undergo testing Goal is to have all the systems ready for testing the last week of January – New 9 MHz cavity commissioning For injection and ramping Advantage – Allow longer bunch during ramp which helps to ease the E-cloud – Shorter bunch length at store when 28MHz cavity is turned on at store Cavity installed and full power tested Ready for commissioning with beam See Mike’s talk for more details 12/16/2008RHIC Spin Collaboration Meeting

Further machine performance improvement Luminosity – Further beta* squeeze Goal is to go to beta* as small as 0.5m – 200 MHz cavity Further reduction of bunch length Polarization – Systematic measurement as function of closed orbit distortion at one of three major resonances above 100 GeV – Systematic measurement as a function of tunes at the resonances 12/16/2008RHIC Spin Collaboration Meeting

Shift leaders and Meetings Shift leaders – Ptitsyn, Luo, Montag, MacKay, Kayran, Robert-Demolaize, Marr, Schoefer Trainees: – Brown, Hao, Wang Backup shift leaders – Trbojevic, Fischer, Pilat, Drees, Satogata, Zhang, Beebe-Wang, Fedotov RHIC Daily meeting : – 9 am in LCR – This may be reduced to every other day when we are in steady operation mode 12/16/2008RHIC Spin Collaboration Meeting

Backup Slides 3/18/2016RHIC APEXWorkshop

RHIC preparation RHIC training : – Detector: two 1 hour seminars on Dec. 8 and Dec. 9 – Machine: four 1 hour seminars on Dec. 15, 17, 18, 19 Injection setup: Fischer Ramp tuning: Satogata Store setup: Ptitsyn Diagnostic/Port Mortem Analysis: Marr, Schoefer Documentation – Run website – Operation wiki: Marr, Schoefer Host the recipe for systems, for system experts, please send the recipe of your system to Greg and Vincent. 3/18/2016RHIC APEXWorkshop

RHIC Instrumentation System: BPM BPM: Satogata, Michnoff – Broken feed-throughs were fixed. Replace the feed-throughs of the bpms at the entrance and exit of the snakes with new ones. – A new type of failing mode was discovered. And the remedy was developed and tested. Expect to see significant less missing bpms from the closed orbit as well as for turn by turn data – New features Pushbutton timing <30ns gate width for self-trigger mode More complete status bits Auto gain and alarms Continuous average orbit – Expect significant improvement of BPM performance of average orbit as well as TBT data For details, please see Michnoff’s presentation in Experimental Diagnostic session 3/18/2016RHIC APEXWorkshop

Tune Feedback System Physics: Yun – Measure/set the coupling angle of each skew quad family for initial setup of the tune/coupling feedback system Hardware – BBQ: Minty confirmed the signal processing part as well as PLL lock using an testing resonator Checked the BBQ I and Q responses as well as the PLL tracking by modulating the resonator’s frequency – Feedback loop setting: Carl This was measured couple of years ago and don’t expect changes Controls: Marusic, Hoff, Ted – pet pages and applications – Replay: Debug the ramp revert when replay is on Plan to test during dry run with an resonator. For details, please see Minty’s presentation in Experimental Diagnostic session 3/18/2016RHIC APEXWorkshop

RHIC CNI polarimeter system Upgrades: – A second set of target and detectors is added to each CNI polarimeter in Blue and Yellow ring – New targets and detectors to address the challenge of high rates when measuring polarization at 250 GeV Status: – New chambers as well as the target driving mechanical systems were installed. The whole system including the control software will be tested in next two weeks – CNI polarimeter application is updated to reflect the latest hardware change More details in Zelenski’s presentation after coffee break 3/18/2016RHIC APEXWorkshop

Blue Injection Setup 3/18/2016RHIC APEXWorkshop Prior to Blue is ready for injection setup – AGS extraction setup – AtR setup: AGS to RHIC synchro setup wit new LLRF Blue injection setup: DAY 1 – DAY 3.5 – Blue power supply work including snake training: Don and team – Establish circulating beam with snakes off: RHIC shift leaders – RF capture with new LLRF and 28 MHz: RF group Bunched beam, establish RF timing – Establish circulating beam with snakes on: RHIC shift leaders In parallel, power supply experts will be working on Yellow magnets – Instrumentation setup: BPM(Satogata, ichnoff), IPM(Connolly), Artus(Drees, Michnoff), BBQ: Minty CNI polarimeter: Huang, Zelenski Injection optimization including injection drift compensation setup in parallel – In contingency to new LLRF commissioning, the two shifts for instrumentation setup could be spent on establishing RF capture with old LLRF Power supply work in Yellow in parallel.

Yellow Injection Setup 3/18/2016RHIC APEXWorkshop Yellow injection setup: DAY 3.5-DAY 7 – Power supply work including DX and Yellow snake training – Establish circulating beam with snakes off – RF capture with new LLRF and 28 MHz New LLRF only Blue new LLRF is successful. – Establish circulating beam with snakes on In parallel, Blue injection working including continuing Blue instrumentation setup Spin rotator training can also be parallel – Instrumentation setup BPM, IPM, Artus, etc. Critical system: BBQ and CNI polarimeter Injection optimization in parallel – In parallel, Blue RF setup for ramp development

New LLRF and 9 MHz setup 3/18/2016RHIC APEXWorkshop Blue RF setup for ramp: 12 hour shift – 6 bunch ramp, blue beam only – This is only necessary if the new LLRF at injection is successful Commission 9 MHz cavity – Re-establish AtR synchro, RF capture and RF timing with 9 MHz cavity According to RF group, this should be straightforward Expect ~6 hours per task – RF setup of Blue and Yellow for ramping With 9 MHz cavity, Blue and Yellow will be cogged for the whole ramp In parallel, – instrumentation setup – tune/decoupling feedback setup – minimize H orbital angle between snakes. Snake current scan

Rmap development 3/18/2016RHIC APEXWorkshop Initial Ramp development: no rotator – Tune/decoupling feedback setup – 6x6 bunch ramp with tune/decoupling feedback on. With the 9MHz, blue and yellow beam will stay cogged during the ramp – orbit optimization Global orbit distortion H orbital angle between snakes – optics optimization Working point and chromaticity – store setup RF setup for store including adiabatic re-bucketing with 28 MHz cavity orbit correction optics correction including non-linear chromaticity correction Non-linearity correction

Ramp development and Store Setup 3/18/2016RHIC APEXWorkshop Continue Ramp development: no rotator – improve ramp with increasing number of bunches until 111x111 – Improve ramp with increasing bunch intensity – Store setup non-linearity correction steering and optics optimizing collimation setup – Deliver collision overnight Rotator ramp development Store setup with rotators on Physics on