Machine Studies (last update: 3.12.2006)

Bernhard Holzer, MHE

Tel. 9-2759

GOTO top, bottom, news, next studies,

list of parasitic and backup machine studies ,

list of earlier machine studies,

list of procedures .

Next HERA Machine Studies

preliminary schedule for : 6-8 December 2006

List of Scheduled Topics:

shift/day	WED, 06.12.	THU, 07.12.	Fri, 08.12.	Sat, 09.12.
M	Maintenance Day	Proton Low Energy Optics Ramp to 460 GeV	access for MVA rotator chamber SR	e+ Injection Tests for low energy optics
A	Preparing Restart, Technical Tests	Proton Low Energy Optics Luminosity File for 460 GeV	p-Magnet Cycling for low energy run 460GeV	Restart Luminosity Operation
N	Proton Low Energy Optics Ramp & Luminosity for 460 GeV	Proton Low Energy Optics e-Ramp & Refill	p-Magnet Cycling for low energy run 460GeV	Lumi Run

Relevant Workfiles for the Machine Studies:

The following files have been prepared for the 460 GeV proton low energy test run and the related machine conditions:

               Workfile 1  --> 300 GeV Protonen Zwi. Optik  E(e+) = 0

                               Workfile 2  --> 460 GeV Protonen Sep. Optik  E(e+) = 0     (... i.e. E-Massa-Unten)

                               Workfile 3  --> 460 GeV Protonen Sep. Optik  E(e+) =12    (... i.e. E-Injektion)

                               Workfile 4  --> 460 GeV Protonen Sep. Optik  E(e+) =23    (... i.e. E-Rampe 23 GeV)

                               Workfile 5  --> 460 GeV Protonen Sep. Optik  E(e+) =27.5 (... i.e. E-Lumi)

                               Workfile 6  --> 460 GeV Protonen Lumi Optik E(e+) =27.5 (... i.e. E-Lumi)

                               Workfile 7  --> 460 GeV Protonen Sep. Optik  E(e+) =31    (... i.e. E-Massa-Oben)

These files contain the main magnet settings fort he new optics proton optics at 460 GeV,and relevant correction currents for

systematic beam steering. All “non-systematic” correction coils are set “non-valid”.

Procedures for Beam Measurements

Instructions for ................................................... polarisation tuning (pdf)

Polarisation Tuning - Templates for........................ energy scan

tune scan

harmonic bump scan
BF Scan (vert. Rotator Magnet)

Measurement of Proton Luminosity Optics using orbit response method

Measurement of ................................................ proton dispersion function

List of Parasitic and Backup Machine Studies

(up)

Parasitic Experiments at lumi

POLARISATION TUNING (pdf)
Evaluation of polarization optimization in 01.2005
Next steps (in this order) :

What causes the polarization fluctuations observed 10.01-n ??
check and document all changes in a stable lumi run
in particular : regularly sned an orbit to the orbiserver

tune scan

new E-scan

new bump scan 0R/I, +1R/I, -1R/I, +2R/I, -2R/I, +3R/I

2. Measurement of Beam Parameters during a "Test Luminosity Run":
Establish a lumi run ``10-on-12'' Bunches

fill and ramp a p-train of 10 (after injection optimization fill one train of 10 in PETRA and inject with bunchrotation 'n' stuff ON in PETRA, and HERA-p-HF at ``Inj.Bedingungen-60'' into HERA with a long pulse !)

fill and ramp 9 colliding e-bunches and 3 pilots at #20 or so

for the e-wire-scanner to work the total e-current must be less than 6 mA
but for the e-wire-scanner measurement to make sense the bunch currents must be more than 250 μA

measure and document p and e emittances

before lumi (at flat top),

with fresh lumi,

and after the lumi has decayed (probably it's worth to mutually harm the protons a little bit by letting the lumi decay for some time)

use of course the p-wire-scanner, and for the electrons :

the e-wire-scanner

the synchrotron light monitor

the gamma spot on the lumi detectors (H1 & ZEUS) [probably works only with collisions]

the vertical beamsize/emittance measurement of LPOL

optimisation of beam positions at the roman pots NL220m (pdf)